Gate, butterfly, check, knife, and control valve manufacturers for water, wastewater, and process applications.

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    Matched providers: 9

    Top countries: United Kingdom, Indonesia

    Popular technologies: Acid Dosing Systems, Aerated Lagoons, MABR

    Water Industry Valves: Gate, Butterfly, Ball, and Pressure Reducing Valve Selection and Standards

    Valves in water and wastewater systems perform isolation, flow control, pressure regulation, and non-return functions across a wide range of pressures (up to 25 bar distribution) and temperatures. Valve types and applications: gate valves (wedge or parallel slide, DN50 to DN2400, PN16 to PN40): full-bore isolation with minimal pressure drop when fully open; used as isolating valves on trunk mains, service reservoirs, and pump stations; slow operation prevents water hammer; BS EN 1171 (resilient-seated), EN 16767, AWWA C509/C515; butterfly valves (concentric lug and flange, high-performance, DN50 to DN3600, PN10 to PN25): compact, light, quarter-turn operation; resilient seat (EPDM) or high-performance metal-to-metal seat; used as isolating and throttling valves; BS EN 593; ball valves (floating ball, trunnion-mounted, DN15 to DN600, PN16 to PN100): tight shut-off, low torque, fast operation; used for isolation in instrumentation, chemical dosing, and small-bore pipework; BS EN ISO 17292; non-return (check) valves (swing, ball, disc, tilt disc, DN25 to DN3000): prevent backflow in pump stations and cross-connections; BS EN 12334; pressure reducing valves (PRVs): district metered area inlet pressure control (direct-acting, pilot-operated, electronic modulating).

    Water industry valve materials must comply with potable water contact regulations. Body materials: ductile iron (GJS-400-15, BS EN 1563): standard for DN50 to DN2400; external epoxy coating (250 micron, RAL 3000 red for fire hydrant, RAL 5015 blue for water main) per BS 3416 or DIN 30677; internal coating (DWI/WRAS-approved epoxy per BS 6920 extraction testing). Stainless steel 316L (1.4404): chemical dosing valves, instrumentation connections, UV systems. Bronze/gunmetal (LG2, CC491K per EN 1982): ball valves, gate valve body material for DN15 to DN50 service connections. Seat materials: EPDM (ethylene propylene diene monomer, -40 to +100 degrees C, excellent chemical resistance, DWI/WRAS approved for potable water); NBR (nitrile, oil-resistant, for hydrocarbon service); PTFE (Teflon, inert, for chemical service). End connection types: flanged (PN6/10/16/25 per EN 1092-2); spigot and socket (for push-fit buried pipework installation); mechanical joint (Victaulic or Viking Johnson couplings for rapid installation/removal); threaded (BSP/NPT for DN15 to DN50).

    Valve actuators and controls: manual handwheels (standard for infrequently operated gate and butterfly valves); electric actuators (Rotork IQ3, Auma Matic, Biffi: 240V, IP67/68, torque 60 to 30,000 Nm, 3-phase for large valves; integrated with SCADA via Profibus, HART, or Fieldbus protocols; quarter-turn 1 to 60 seconds open/close time); pneumatic actuators (compact, fast-acting, fail-safe spring-return for safety shutdown valves; air supply requirement 4 to 7 bar); hydraulic actuators (for large, high-thrust valves, gate valves on trunk mains, dams, flood defence gates). Valve selection standards: Water UK/UKWIR specifications for water industry valve procurement; Sewers for Adoption 7th edition (sewer isolation valves for adoptable sewers); Specification for Highway Works (SHW) Series 500 for water mains within highway; AWWA C200 to C600 series for US water industry valve standards. Operational maintenance: ISO 55001 (Asset Management) requires planned preventive maintenance for valves - typically operating quarterly to verify function, and overhaul at 10 to 20 years. Electric actuator servicing: annual greasing, capacitor replacement at 7 to 10 years. Gate valve gland repacking: 5 to 10 yearly depending on operation frequency and seatface wear.

    Frequently Asked Questions

    What is the difference between a gate valve and a butterfly valve?

    Gate valves and butterfly valves are both isolation valves but differ in design, pressure rating, and application: Gate valves: wedge-shaped gate (or parallel slide) moves perpendicular to flow axis; full-bore opening (no obstruction when open); negligible pressure drop at full open (Kv effectively unrestricted); slow operation (25 to 50 turns of handwheel to open/close, preventing water hammer in large mains); suitable DN50 to DN2400; PN16 to PN40; heavier than equivalent butterfly valve; used on trunk mains where slow isolation and full bore are essential (pig launching, large pipe isolation). Butterfly valves: disc rotates quarter-turn within pipe bore; disc always present in flow path (creates 0.5 to 1.5 bar pressure drop at full open for large DN); compact, lighter, cheaper than gate for large DN; quarter-turn operation (15 to 30 seconds); suitable DN50 to DN3600; PN10 to PN25; resilient seat butterfly valves limited to clean water (seat wear in abrasive service); high-performance butterfly (metal seat, DN300 to DN2400) for dirty or high-pressure service. Selection rule: gate valves for infrequently operated isolations on main trunk/transmission mains; butterfly valves for operational isolations, pump control, and where space or weight is limited.

    What valve standards apply to UK water industry?

    Key valve standards for UK water industry: Gate valves: BS EN 1171:2015 (Industrial valves - cast iron gate valves); BS EN 16767 (plastic-lined gate valves); older UK WIS (Water Industry Specification) 4-02-01 still referenced by some utilities. Butterfly valves: BS EN 593:2004 (Industrial valves - metallic butterfly valves); WIS 4-02-03 for ductile iron butterfly valves in water industry. Ball valves: BS EN ISO 17292; BS EN 13942 (petroleum industry); BS EN 1983 (steel valves for industrial use). Non-return valves: BS EN 12334; BS EN 16767 for plastics. PRVs: BS EN 1567 (direct-acting); WIS 4-02-04 for PRVs and flow regulators. Actuation: EN 15714-2 (electric actuators); EN 15714-3 (pneumatic). Material approvals: all valves in contact with potable water must be WRAS-approved (or BS 6920 extraction tested) and meet DWI Regulation 31 requirements; valve body and seat material approval - WRAS Product Approval Scheme. Fire hydrant valves: BS EN 14339 (underground fire hydrants); BS EN 14384 (pillar fire hydrants). Sewers for Adoption 7th edition: specifies valve types for adoptable sewer infrastructure. Water UK/UKWIR: publishes industry guidance on valve procurement, testing, and maintenance.

    How do pressure reducing valves work in water distribution?

    Pressure Reducing Valves (PRVs) maintain a pre-set downstream pressure regardless of upstream pressure or flow demand variations. Operating principle: (1) Direct-acting PRV (spring-loaded diaphragm type): downstream pressure acts on a diaphragm connected to a valve disc; spring pre-loaded to the required downstream set pressure; when downstream pressure rises above setpoint, diaphragm compresses spring, valve disc closes further; when pressure drops below setpoint, spring opens valve; hydraulic equilibrium maintained at setpoint; accuracy plus or minus 0.5 to 1.0 bar. (2) Pilot-operated PRV: small pilot valve senses downstream pressure and controls main valve position hydraulically via a control chamber; accuracy plus or minus 0.2 to 0.3 bar; handles larger flows and more complex control modes (pressure sustaining, flow limiting, altitude control - different pilot combinations). (3) Electronic modulating PRV (smart PRV): electro-hydraulic actuator (Rotork, Auma) controlled by electronic pressure transducer and PLC; enables remote setpoint adjustment via SCADA; time-of-day modulation (lower night pressure when demand is lower); flow-modulated control (higher pressure at high demand, lower at low demand to minimise background leakage). UK water industry: PRVs are the primary tool for pressure management and leakage control in District Metered Areas; typically set to maintain service pressure minimum 15 m head at all connections.

    What maintenance is required for water industry valves?

    Valve maintenance requirements for water industry assets: Gate valves (isolation, infrequently operated): operated quarterly (open-close cycle) to prevent seizure and verify operability (OFWAT KPI: valve operability rate greater than 95 percent); gland packing inspection at annual service, replace PTFE/graphite packing when leakage observed; lubricating the gland nut and stem annually; overhaul (disassembly, seat inspection, gate face check, repacking) at 10 to 20 years; record condition in GIS/asset management system. Butterfly valves (operational, frequently operated): gearbox oil check annually; seat condition inspection every 2 to 3 years (check for wear, nicks, or extrusion damage); actuator service per manufacturer (Rotork: 5-yearly for IQ3; grease and capacitor replacement); calibration of actuator torque limits. PRVs: quarterly: check downstream pressure and flow in DMA night flow analysis; annual: inspect and clean strainer (upstream pre-filter); test setpoint accuracy with calibrated pressure gauge; clean pilot valve orifices; replace diaphragm if cracked. Smart PRVs (electronic modulating): verify pressure transducer calibration; firmware update; data logger review. Emergency valves (surge protection): annual full-stroke test; hydraulic pilot test. UK Ofwat reporting: valve operability is a reported metric; water companies use GIS-linked asset management to schedule maintenance and record valve condition.

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    Infrastructure, Networks & Equipment

    Water Valve Companies

    Gate, butterfly, check, knife, and control valve manufacturers for water, wastewater, and process applications.

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    This page is a good fit if you need:

    • Acid Dosing Systems or Aerated Lagoons, MABR capabilities
    • Suppliers with treatment works products/services sector experience
    • Providers operating in United Kingdom or Indonesia
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    Networks - Sewerage2

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    Acid Dosing Systems1
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    Ecosystems International logo

    Ecosystems International

    Verified
    Indonesia51-200 employees
    Flat Sheet Microfiltration Units · Hollow Fiber MF Systems · Ceramic Microfiltration Modules +80 more
    apac · china · europe +3 more

    PT Ecosystems International (PT ESI) was established at Jakarta on 21st November 2006. We are an industrial effluent treatment systems integrator specializing in electrocoagulation (EC), a unique waste water treatment profile. PT ESI has capabilities in designing complete waste water treatment solutions by combining various effluent treatment systems such as the electro-coagulation, biological, chemical processes and membrane filtration, offering its customers a wide and comprehensive range of solutions, tailored to suit their various needs – ranging from basic effluent treatment for discharge to effluent recycling for water reuse. The Company is experienced in handling the design, engineering, procurement, construction and operation of new Effluent Treatment Plants (“ETP”) and possesses expertise in retrofitting existing ETP to increase the flow rate and treatment capability without any major infrastructure increase PT ESI is also a premier waste water treatment service company specializing in handling waste water generated from Exploration (Drilling) and Produced Water. Customers in Indonesia include major Oil & Gas companies such as Pertamina, Exxon, Chevron, Petro-China and Medco. Operations in Indonesia are provided by both mobile and fixed units. At drill sites where waste-water recycling is required, PT ESI supplement these treatment units with skid mounted mobile Reverse Osmosis systems. The technologies and solutions employed by PT ESI are developed in-house and examples of these are its proprietary Trident™ Electro Contaminant Removal (“ECR”) system, the Stage Contaminant Removal (“SCR”) process and Mobile On-Site Waste-Water Treatment (“OWT”) units

    Reverse Osmosis (RO) Systems
    Ultrafiltration (UF) Systems
    Multi-media Filtration (MMF) Systems
    +63 more
    agriculture
    manufacturing
    Glenfield Invicta Ltd logo

    Glenfield Invicta Ltd

    United Kingdom

    From concept to completion, Glenfield Invicta’s end-to-end Project Solutions provide market leading valve and penstock engineering excellence, across a multitude of water utility and non-water utility infrastructure projects. The company combines the strength and unique proposition of Invicta’s site solutions, penstocks, and environmental expertise, with Glenfield’s experience and expertise in specifying and managing large Dams, Reservoirs and Hydropower projects. Supported by the vast product portfolio from the AVK Group of manufacturing companies. We are market leaders distinguished by our industry expertise, we have been designing and manufacturing specialist engineered valves and penstocks for more than 170 years. We stand behind every product we install for life, offering some of the best extended warranties in the industry. Our experienced and multi-skilled project team work closely with our partners and key stakeholders to ensure your project is executed to exacting standards. Our long history in designing, supplying, and installing highly engineered valves and pipeline equipment in projects is what sets us apart. Our projects are delivered safely, on time, and to the highest standards in arduous applications. This specialist capability has made the our brands synonymous with engineering excellence worldwide. We have recently invested over £2m in our Kilmarnock facility which extends to over 200,000 sq. ft. of manufacturing, office, warehousing, and education space. It includes a new purpose-built Learning Academy; which will include an interactive visitor centre. We are committed to training the apprentices and engineers of the future.

    Project Planning & Surveying
    Designers
    FT Ductile Ltd logo

    FT Ductile Ltd

    United Kingdom

    Ductile Iron Pipe and Fittings FT Ductile supplies a wide range of high quality, ductile iron pipes, fittings and ancillary products to the water industry for both potable and dirty water. Large stocks at our premises allow us to fulfil many orders on a next-day basis. Whatever the size of project, we can provide a tailor-made solution to include the sourcing, supply, delivery and after sales service. We supply ductile iron pipes in a range of diameters, from 80mm to 1600mm. Over the years, the range of products supplied by FT Ductile has expanded to include everything from ductile iron pipes to flange adaptors and valves. We have a number of exclusive distribution agreements in place and all products conform to DWI standards. Ductile iron pipes are most commonly used for drinking water and sewage distribution, usually lined with cement mortar in order to prevent corrosion over time. The benefit of using ductile iron pipes in potable and waste water systems is that they are stronger and resistant to fracture. FT Ductile has supply chain links with companies in Europe, USA and the Far East which has given us strong foundations for understanding how other cultures and nationalities like to do business. This information is invaluable when we come to export our pipe products and services. Wherever you are based, and whatever you require, from individual items such as valves and fittings, through to more complex orders for lengths of ductile pipe and fittings, we will provide you with our best possible price. And you can rest assured that through our extensive transport links, our products will reach you in a safe and timely manner. To find out more regarding our ductile iron pipes and other products, please feel free to contact us.

    Treatment Works Products/Services
    Networks - Sewerage
    AUMA Actuators Limited logo

    AUMA Actuators Limited

    United Kingdom

    Based in Clevedon, near Bristol, North Somerset, AUMA Actuators Limited is the UK subsidiary of the global AUMA Reister GmbH and Co., the world’s largest manufacturer of electric valve actuators, operating on every continent, with 2,300 employees in 30 locations. AUMA Actuators Limited is the UK arm of global manufacturer AUMA Reister GmbH, manufacturing daily over 500 electric actuators for valves, penstocks and dampers. A trusted supplier to the UK water and wastewater industry, AUMA holds supply and maintenance frameworks with all major UK water companies. With a UK-based team of experts and a £2.5 million inventory held locally, AUMA ensures rapid response and fast-track call-off for urgent project requirements. AUMA provides electric actuators – including variable speed, explosion-proof and underwater variants – plus gearboxes for flow control across water and wastewater networks, backed by comprehensive service, maintenance, and support tailored to the specific needs of the UK water sector. Key Products • SQ and SA part and multi-turn actuators for Class A and B operation, torques from 10 Nm to 32,000 Nm extendable to 675,000 Nm with optional gearboxes. • SQR and SAR modulating actuators provide Class C control up to 1500 starts/hr. Torques from 15 Nm to 2,400 Nm depending on model chosen. • SQV and SAV variable speed actuators provide accurate close control of valve position and flow rate, with soft-open and soft-close ability that protect ageing assets while retaining speed of operation and emergency functions. Tripping torques from 10 Nm to 1000 Nm. Modulating versions SQRV and SARV are also available • Profox – compact actuators for part- and multi-turn applications – easy to set up, reliable and tough, for torque ranges up to 600 Nm (part turn) and 100 Nm (multi-turn) For explosive atmospheres, AUMA actuators are available with full ATEX certification. Please ask us for details. AUMA equipment is built for the digital world. Full Fieldbus integration, the ability to integrate and consolidate other plant signals and bidirectional control makes AUMA an ideal project partner, while the modular approach and versatile configuration of AUMA equipment makes it ideal when you are considering automation of existing assets.

    Reservoirs - Treated Water
    Accreditations
    Spaans Babcock Ltd logo

    Spaans Babcock Ltd

    United Kingdom

    Spaans Babcock was established in 1897 and has been supplying equipment into the water industry since this date. The company are the world’s largest supplier of Archimedes screws having thousands of screws installed throughout the UK & tens of thousands worldwide. Additionally the company supply, install and maintain aeration equipment (surface and brush aerators), screens and screenings handling equipment, a complete range of flow isolation equipment including penstocks, flap valves and stop-boards. Over recent years the company has expanded significantly with the addition of Archimedes screw generators to its product range. This is a natural progression for the product which is perfectly suited to low head applications, they offer several advantages over alternative technologies including no requirement for fine screens, fish friendliness, non-blocking and low maintenance due to the simple & robust design. The screw generator is offered in various alternative designs to suit given site circumstances. Spaans have agreements in place with many of the UK Water companies & agencies for the design, manufacture, supply, installation and maintenance of their equipment. Centrally based in Heywood, the company offers a full range of services from supply only contracts through to development of complete bespoke packages. Project management is handled by the companies own project teams and the company has its own SHE officer to ensure compliance with the stringent UK requirements. All installation and maintenance work is handled by in house teams of engineers.

    Renewables & Energy Management
    Quantum Engineering Developments Ltd logo

    Quantum Engineering Developments Ltd

    United Kingdom

    Quantum Engineering Developments Limited specialises in the design, construction installation and commissioning of surge control systems, compressed air systems and booster pump sets. Surge Control Systems Surge conditions, or ‘water hammer’ can occur due to starting or stopping a pump, or failures in the power supply, controls or valves. Quantum Engineering is the leading UK supplier of surge vessels and related control equipment for the alleviation of this effect. All systems can include a patented QUBE controller, developed especially for surge vessel and accumulator control in complex variable flow rate and multi-pump systems. Packaged Booster Pump Sets The company supplies booster sets suitable for applications in final effluent and potable water booster pumps for sewage and water treatment installations. Control Panels Quantum Engineering specialises in the construction of multi-compartment control panel suites to suit the requirements of most UK water authorities. Electrical control panels are available with relay, PLC and microprocessor controlled logic systems, including variable speed drives and soft start, as well as conventional DOL and STAR/DELTA starters. Accreditation All systems are factory tested in house, and are assembled and fitted to meet current statutory requirements, including UK pressure systems legislation and DWI Regulations 25 and 31. Recent Contracts QED supply and install surge vessels via both main contractors and direct with the end users, to nearly all of the UK water companies on both new and replacement/refurbishment projects. What can Quantum do for you today?

    Accreditations
    Saint Gobain PAM UK logo

    Saint Gobain PAM UK

    United Kingdom

    Saint Gobain PAM UK is the premier supplier of ductile iron and cast iron products to the UK's key utilities, telecoms, highways, civil engineering, construction and housing companies. We’re a leading manufacturer of ductile iron access covers, gully gratings, and pressure pipeline systems, helping the UK’s utility, highways, telecoms and infrastructure network owners reduce their whole-life costs and carbon while improving their asset durability and health and safety standards. We proudly manufacture our solutions, which enables us to not only meet but exceed the most stringent safety, quality and environmental standards. This means all of our access covers, gully gratings, and surface boxes are 100% recyclable. By providing innovative and sustainable access covers, gully gratings and pipeline systems that are right the first time, our customers enjoy quality and durable solutions that solve their problems the first time they’re installed – backed by the experts who designed them. 👨‍🔬🔬🥼 Saint-Gobain PAM UK is part of the Saint-Gobain Group, which employs over 166,000 people in 75 countries. With the international support of parent company Saint-Gobain, we offer unrivalled technical support, a total solution approach and unparalleled quality and innovation. Our solutions include: Ductile iron access covers, gully gratings and kerbside drainage solutions Ductile iron water and sewer pipes, fittings, valves, couplings and adaptors

    Treatment Works Products/Services
    Networks - Sewerage
    AVK UK Ltd logo

    AVK UK Ltd

    United Kingdom

    AVK UK is part of the globally renowned AVK Group who are based in over 100+ countries and has over 4,500+ employees worldwide. The AVK Group is privately owned by the founder Niels Aage Kjaer, and is named after his father Aage Valdemar Kjaer. As part of the AVK Group, we pride ourselves in being one of the leading valve manufacturers for the water, sewage, firefighting, and gas industries. Our product program comprises a large range of valves, hydrants, pipe fittings and accessories, each complying with the highest standards of safety and durability. Our focus is on the products designed and manufactured to the British Standards, however, the AVK Group today offers products in accordance with the most national and international standards. Our product portfolio also includes AVK Smart Water Management valves and sensors for real-time network information and status. We also offer Pressure Management solutions such as air valves, PRVs, and control valves, AVK Assist which enables GPS product location and, the market leading Donkin PUR range of gas valves. Our UK sales offices and manufacturing sites respond quickly to the needs of our customers and for fittings required on an express or emergency service we have a dedicated same day 24/7 helpline – 0800 202 8228. In addition, we cooperate with local and national distributor partners to offer our customers AVK products as part of multi-product packages. AVK UK is the sales division and has offices in Staveley, near Chesterfield, also known as the home of Bryan Donkin gas valves, and Northampton. AVK in the UK comprises of 7 companies and has over 500 employees. Find out more here: https://www.avkuk.co.uk/en-gb/solutions-and-information/about/avk-in-the-uk/avk-uk

    Treatment Works Products/Services
    Asset Maintenance & Rehabilitation
    R2M Limited logo

    R2M Limited

    United Kingdom

    At R2M, we are driven by a passion for creating innovative solutions that help build a smarter, more resilient water industry. Our mission is to deliver effective, high-quality products and services to UK water utilities and contractors, continually striving to enhance the nation's water supply for future generations. Founded in 2003 as a supplier of pipes and fittings, R2M quickly earned a reputation for reliability through our extensive product range and robust stock levels—ensuring our customers always had what they needed, when they needed it. Over the years, we have evolved from a trusted supplier into a comprehensive manufacturer and installer too. Today, we offer end-to-end solutions—all under one roof—streamlining the process for our customers and providing exceptional value at every stage. We are proud to be used trusted by all water utilities and contractors across the UK. Since 2019, R2M has proudly been a member of the Hawle Austria Group—a global network of like-minded, quality-focused companies including the likes of Hawle Austria, Erhard, Nova Siria, and Özkan. This partnership gives us exclusive access to a wide portfolio of innovative and proven products from across the group, allowing us to offer tailored solutions that meet the evolving needs of our customers. Being a part of this established and experienced group strengthens our capabilities, expands our product range, and ensures we stay at the forefront of the industry—so our customers always benefit from world-class technologies backed by local expertise. Are you ready to discover how our solutions can support your next project? Get in touch with us today on 01282 778 030.

    Networks - Water Supply
    Asset Maintenance & Rehabilitation

    Water Industry Valves: Gate, Butterfly, Ball, and Pressure Reducing Valve Selection and Standards

    Valves in water and wastewater systems perform isolation, flow control, pressure regulation, and non-return functions across a wide range of pressures (up to 25 bar distribution) and temperatures. Valve types and applications: gate valves (wedge or parallel slide, DN50 to DN2400, PN16 to PN40): full-bore isolation with minimal pressure drop when fully open; used as isolating valves on trunk mains, service reservoirs, and pump stations; slow operation prevents water hammer; BS EN 1171 (resilient-seated), EN 16767, AWWA C509/C515; butterfly valves (concentric lug and flange, high-performance, DN50 to DN3600, PN10 to PN25): compact, light, quarter-turn operation; resilient seat (EPDM) or high-performance metal-to-metal seat; used as isolating and throttling valves; BS EN 593; ball valves (floating ball, trunnion-mounted, DN15 to DN600, PN16 to PN100): tight shut-off, low torque, fast operation; used for isolation in instrumentation, chemical dosing, and small-bore pipework; BS EN ISO 17292; non-return (check) valves (swing, ball, disc, tilt disc, DN25 to DN3000): prevent backflow in pump stations and cross-connections; BS EN 12334; pressure reducing valves (PRVs): district metered area inlet pressure control (direct-acting, pilot-operated, electronic modulating).

    Water industry valve materials must comply with potable water contact regulations. Body materials: ductile iron (GJS-400-15, BS EN 1563): standard for DN50 to DN2400; external epoxy coating (250 micron, RAL 3000 red for fire hydrant, RAL 5015 blue for water main) per BS 3416 or DIN 30677; internal coating (DWI/WRAS-approved epoxy per BS 6920 extraction testing). Stainless steel 316L (1.4404): chemical dosing valves, instrumentation connections, UV systems. Bronze/gunmetal (LG2, CC491K per EN 1982): ball valves, gate valve body material for DN15 to DN50 service connections. Seat materials: EPDM (ethylene propylene diene monomer, -40 to +100 degrees C, excellent chemical resistance, DWI/WRAS approved for potable water); NBR (nitrile, oil-resistant, for hydrocarbon service); PTFE (Teflon, inert, for chemical service). End connection types: flanged (PN6/10/16/25 per EN 1092-2); spigot and socket (for push-fit buried pipework installation); mechanical joint (Victaulic or Viking Johnson couplings for rapid installation/removal); threaded (BSP/NPT for DN15 to DN50).

    Valve actuators and controls: manual handwheels (standard for infrequently operated gate and butterfly valves); electric actuators (Rotork IQ3, Auma Matic, Biffi: 240V, IP67/68, torque 60 to 30,000 Nm, 3-phase for large valves; integrated with SCADA via Profibus, HART, or Fieldbus protocols; quarter-turn 1 to 60 seconds open/close time); pneumatic actuators (compact, fast-acting, fail-safe spring-return for safety shutdown valves; air supply requirement 4 to 7 bar); hydraulic actuators (for large, high-thrust valves, gate valves on trunk mains, dams, flood defence gates). Valve selection standards: Water UK/UKWIR specifications for water industry valve procurement; Sewers for Adoption 7th edition (sewer isolation valves for adoptable sewers); Specification for Highway Works (SHW) Series 500 for water mains within highway; AWWA C200 to C600 series for US water industry valve standards. Operational maintenance: ISO 55001 (Asset Management) requires planned preventive maintenance for valves - typically operating quarterly to verify function, and overhaul at 10 to 20 years. Electric actuator servicing: annual greasing, capacitor replacement at 7 to 10 years. Gate valve gland repacking: 5 to 10 yearly depending on operation frequency and seatface wear.

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    Frequently Asked Questions

    What is the difference between a gate valve and a butterfly valve?

    Gate valves and butterfly valves are both isolation valves but differ in design, pressure rating, and application: Gate valves: wedge-shaped gate (or parallel slide) moves perpendicular to flow axis; full-bore opening (no obstruction when open); negligible pressure drop at full open (Kv effectively unrestricted); slow operation (25 to 50 turns of handwheel to open/close, preventing water hammer in large mains); suitable DN50 to DN2400; PN16 to PN40; heavier than equivalent butterfly valve; used on trunk mains where slow isolation and full bore are essential (pig launching, large pipe isolation). Butterfly valves: disc rotates quarter-turn within pipe bore; disc always present in flow path (creates 0.5 to 1.5 bar pressure drop at full open for large DN); compact, lighter, cheaper than gate for large DN; quarter-turn operation (15 to 30 seconds); suitable DN50 to DN3600; PN10 to PN25; resilient seat butterfly valves limited to clean water (seat wear in abrasive service); high-performance butterfly (metal seat, DN300 to DN2400) for dirty or high-pressure service. Selection rule: gate valves for infrequently operated isolations on main trunk/transmission mains; butterfly valves for operational isolations, pump control, and where space or weight is limited.

    What valve standards apply to UK water industry?

    Key valve standards for UK water industry: Gate valves: BS EN 1171:2015 (Industrial valves - cast iron gate valves); BS EN 16767 (plastic-lined gate valves); older UK WIS (Water Industry Specification) 4-02-01 still referenced by some utilities. Butterfly valves: BS EN 593:2004 (Industrial valves - metallic butterfly valves); WIS 4-02-03 for ductile iron butterfly valves in water industry. Ball valves: BS EN ISO 17292; BS EN 13942 (petroleum industry); BS EN 1983 (steel valves for industrial use). Non-return valves: BS EN 12334; BS EN 16767 for plastics. PRVs: BS EN 1567 (direct-acting); WIS 4-02-04 for PRVs and flow regulators. Actuation: EN 15714-2 (electric actuators); EN 15714-3 (pneumatic). Material approvals: all valves in contact with potable water must be WRAS-approved (or BS 6920 extraction tested) and meet DWI Regulation 31 requirements; valve body and seat material approval - WRAS Product Approval Scheme. Fire hydrant valves: BS EN 14339 (underground fire hydrants); BS EN 14384 (pillar fire hydrants). Sewers for Adoption 7th edition: specifies valve types for adoptable sewer infrastructure. Water UK/UKWIR: publishes industry guidance on valve procurement, testing, and maintenance.

    How do pressure reducing valves work in water distribution?

    Pressure Reducing Valves (PRVs) maintain a pre-set downstream pressure regardless of upstream pressure or flow demand variations. Operating principle: (1) Direct-acting PRV (spring-loaded diaphragm type): downstream pressure acts on a diaphragm connected to a valve disc; spring pre-loaded to the required downstream set pressure; when downstream pressure rises above setpoint, diaphragm compresses spring, valve disc closes further; when pressure drops below setpoint, spring opens valve; hydraulic equilibrium maintained at setpoint; accuracy plus or minus 0.5 to 1.0 bar. (2) Pilot-operated PRV: small pilot valve senses downstream pressure and controls main valve position hydraulically via a control chamber; accuracy plus or minus 0.2 to 0.3 bar; handles larger flows and more complex control modes (pressure sustaining, flow limiting, altitude control - different pilot combinations). (3) Electronic modulating PRV (smart PRV): electro-hydraulic actuator (Rotork, Auma) controlled by electronic pressure transducer and PLC; enables remote setpoint adjustment via SCADA; time-of-day modulation (lower night pressure when demand is lower); flow-modulated control (higher pressure at high demand, lower at low demand to minimise background leakage). UK water industry: PRVs are the primary tool for pressure management and leakage control in District Metered Areas; typically set to maintain service pressure minimum 15 m head at all connections.

    What maintenance is required for water industry valves?

    Valve maintenance requirements for water industry assets: Gate valves (isolation, infrequently operated): operated quarterly (open-close cycle) to prevent seizure and verify operability (OFWAT KPI: valve operability rate greater than 95 percent); gland packing inspection at annual service, replace PTFE/graphite packing when leakage observed; lubricating the gland nut and stem annually; overhaul (disassembly, seat inspection, gate face check, repacking) at 10 to 20 years; record condition in GIS/asset management system. Butterfly valves (operational, frequently operated): gearbox oil check annually; seat condition inspection every 2 to 3 years (check for wear, nicks, or extrusion damage); actuator service per manufacturer (Rotork: 5-yearly for IQ3; grease and capacitor replacement); calibration of actuator torque limits. PRVs: quarterly: check downstream pressure and flow in DMA night flow analysis; annual: inspect and clean strainer (upstream pre-filter); test setpoint accuracy with calibrated pressure gauge; clean pilot valve orifices; replace diaphragm if cracked. Smart PRVs (electronic modulating): verify pressure transducer calibration; firmware update; data logger review. Emergency valves (surge protection): annual full-stroke test; hydraulic pilot test. UK Ofwat reporting: valve operability is a reported metric; water companies use GIS-linked asset management to schedule maintenance and record valve condition.

    Case Study·Water distribution network asset management
    Challenge

    A water company in the Midlands managing 18,000 network isolation valves had a recorded valve operability rate of 78%, against an Ofwat AMP8 target of 95%. A significant proportion of inoperable valves were century-old cast iron gate valves that had never been exercised, creating critical control gaps in the event of a main burst or water quality incident requiring zone isolation.

    Approach

    The company implemented a 5-year valve operability improvement programme, prioritising valves by criticality (trunk main isolation, zone boundary, and PRV isolation valves first). A specialist contractor used mobile exercising units to turn all valves within the first 3 years, recording torque, turns to close, and condition in the GIS-linked asset management system. Inoperable valves were replaced with ductile iron gate valves (BS EN 1074-1:2000) or butterfly valves with electric actuators (Rotork IQ3) at critical locations.

    Outcome

    Valve operability rate improved from 78% to 93.4% within 36 months. 1,240 valves were replaced, of which 380 were on trunk mains where isolation time previously exceeded 4 hours. Network isolation time for simulated burst events fell from average 3.8 hours to 1.2 hours in tabletop exercises. The programme contributed directly to Ofwat AMP8 network resilience ODI performance, avoiding an estimated GBP 1.8 million in penalty payments.

    Questions to Ask Shortlisted Providers

    1. 1

      What is the current valve operability rate in the network and what is the Ofwat performance commitment target for AMP8?

      Ofwat AMP8 operational performance commitments include valve operability as a metric; companies below 95% operability face financial penalties; the gap between current and target operability defines the programme scope and urgency.

    2. 2

      What is the valve type (gate, butterfly, PRV, check, air valve) and what actuator type (manual, electric, hydraulic, pneumatic) is specified?

      Actuator selection depends on operational frequency, available power, response time requirement, and remote control needs; electric actuators with SCADA integration are increasingly specified for critical network valves under Ofwat AMP8 resilience requirements.

    3. 3

      What materials of construction are specified for the pipeline material, fluid type (potable, treated wastewater), and chloride environment?

      Ductile iron valves with epoxy-coated bodies and EPDM seats are standard for potable water mains; stainless trim (316L) is required for saline or coastal environments; incorrect material selection causes premature seat failure and disc corrosion.

    4. 4

      Are the valves required to meet WRAS approval and what certification does the manufacturer provide?

      Valves in potable water contact must be WRAS-approved per Water Supply (Water Fittings) Regulations 1999; certification must cover the full valve body, seat, and stem packing materials, not just the body material.

    5. 5

      What end-of-line testing, performance certification, and as-built documentation is required for adoptable mains?

      Sewers for Adoption (SfA) 7th Edition and water company infrastructure design standards specify valve testing (BS EN 1074-1 performance test, WRAS approval, pressure test) and documentation requirements before mains are adopted.

    What Drives Cost in This Category

    Valve type, size, and actuator specification

    Manual gate valves DN 100 to DN 400 cost GBP 200 to 3,500 each supply-only; electrically actuated butterfly valves DN 300 (Rotork IQ3, ductile iron body, EPDM seat, 316L disc) cost GBP 8,000 to 25,000 including actuator; PRVs with electronic modulating control cost GBP 15,000 to 45,000 per installation.

    Valve exercising programme and replacement mobilisation

    Valve exercising by specialist contractor costs GBP 40 to 120 per valve including GIS data update; large-diameter trunk main valve replacement requires traffic management, bypass pumping, and zone pressure management costing GBP 15,000 to 80,000 per valve.

    Chamber and civil works for buried valves

    Valve chamber installation (precast concrete manhole, ductile iron frame and cover, approach pipework) costs GBP 3,000 to 12,000 depending on depth and access; chambers in highways require traffic management and reinstatement per New Roads and Street Works Act 1991.

    SCADA integration and remote telemetry

    Electric actuator SCADA integration (4-20 mA control, 24V DC power, GSM telemetry) costs GBP 2,000 to 8,000 per valve position; NIS Regulations 2018 require cybersecurity assessment for SCADA-connected valve control systems.

    Key Regulations & Standards

    BS EN 1074-1:2000 Valves for Water Supply Fitness for Purpose Requirements

    Specifies performance requirements for water supply valves including pressure rating, flow characteristics, closing torque, endurance, and leakage rate; compliance is required for WRAS approval and adoption of valves into water company infrastructure.

    Water Supply (Water Fittings) Regulations 1999 and WRAS Approval

    All valves in contact with potable water must be WRAS-approved; approval is product-specific and covers all wetted materials; non-approved valves cannot be installed on potable water mains without DWI consent.

    New Roads and Street Works Act 1991 and Street Works UK Code of Practice

    Installation or replacement of valves in public highways requires statutory undertaker notice and reinstatement to Highway Authority specification; emergency works (burst main, isolation valve failure) allow expedited working but reinstatement remains mandatory.

    Ofwat AMP8 Resilience and Valve Operability Performance Commitments

    Ofwat AMP8 Final Determinations include network resilience performance commitments covering valve operability rates; companies must report operability annually; persistent underperformance triggers financial penalties under the ODI (Outcome Delivery Incentive) mechanism.

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