The flanged end waterworks gate valve is a heavy-duty pipeline isolation valve designed for municipal water supply networks, potable water treatment plants, pumping stations, transmission mains, and industrial water systems.
The valve utilizes a wedge moving perpendicular to the pipeline flow to deliver bubble-tight bi-directional isolation. Flanged end connections provide a rigid, bolted connection compatible with standard piping, allowing straightforward installation, inspection, and future maintenance access.
Technical Specifications
|
Item |
Specification / Options |
|
Product Type |
Flanged End Waterworks Gate Valve (Resilient Seated / Metal Seated) |
|
Function |
Pipeline bi-directional shut-off and isolation |
|
Nominal Size |
DN50 - DN1200 / NPS 2 inch - 48 inch |
|
Pressure Rating |
PN10, PN16, PN25 / Class 125, Class 150, Class 300 |
|
Design Standards |
AWWA C509, AWWA C515, BS EN 1074-1/2, BS 5163, DIN 3352, ISO 7259 |
|
Face-to-Face Standards |
EN 558 Series 14 / 15 (DIN 3202 F4 / F5), ASME B16.10, ISO 5752 |
|
Flange Connection |
EN 1092-2 (PN10/16/25), ASME B16.1 / B16.42 Class 125/150, AWWA C207 |
|
Body & Bonnet Material |
Ductile Iron (ASTM A536 65-45-12 / EN-GJS-450-10 or EN-GJS-500-7) |
|
Gate / Wedge Material |
Ductile Iron fully encapsulated with EPDM or NBR vulcanized rubber |
|
Stem Material |
Stainless Steel (AISI 420, 304, 316, 431) or High-Tensile Brass/Bronze |
|
Stem Configuration |
Non-Rising Stem (NRS) or Outside Screw and Yoke (OS&Y / Rising Stem) |
|
Coating & Protection |
Fusion Bonded Epoxy (FBE) coating, internal and external, min. 250 µm thickness |
|
Drinking Water Compliance |
Materials suitable for compliance with WRAS, NSF/ANSI 61, DVGW, ACS |
|
Actuator Top Flange |
ISO 5211 mounting pad for gearbox or electric/pneumatic actuator retrofitting |
|
Testing Standards |
EN 12266-1, ISO 5208, AWWA C509/C515 (100% Factory Hydrostatic Tested) |
Design Features & Engineering Highlights
Resilient Seated Wedge: Fully encapsulated in EPDM or NBR rubber for zero-leakage shut-off and smooth operation. EPDM is ideal for potable water up to 70°C and complies with global drinking water safety requirements, while NBR is recommended for raw water or industrial utility loops.
Compact NRS Construction: The internal stem thread engages within the wedge, keeping the stem height static during operation. This reduces overhead clearance requirements for underground valve vaults and direct burial applications.
Corrosion Resistance (FBE Protection): Shot-blasted to Sa 2.5 and electrostatically coated with Fusion Bonded Epoxy (FBE, minimum 250 µm thickness) inside and out, preventing tuberculation, bio-fouling, and soil corrosion.
Actuation Ready: Standardized ISO 5211 top flange mounting allows easy retrofit of gearboxes, electric actuators, or pneumatic controls without removing the valve from the line.
Applications
Municipal Water Networks: Sectional isolation on trunk mains, distribution pipelines, and underground valve pits.
Water Treatment Plants (WTP): Raw water intake, clear water output, and process isolation.
Pumping Stations: Pump suction and discharge lines requiring full-bore flow and minimal head loss.
Transmission Pipelines: Long-distance raw and treated water conveyance systems.
Reservoirs & Utilities: Tank inlet/outlet control, storage drainage, industrial cooling loops, and fire protection systems.
Quality Control & Testing
Material Traceability: Chemical analysis and mechanical property testing for castings and stem materials (EN 10204 3.1 certification available).
Precision Machining: CNC machining of flange faces, bolt circles, and stem threads.
100% Hydrostatic Pressure Testing:
Shell Test: 1.5 x PN (Nominal Pressure)
Seat Test: 1.1 x PN (Zero-leakage shut-off test)
Coating Inspection: Dry film thickness measurement and electrical holiday detection to ensure a pore-free protective barrier.
Request a Quote (RFQ Checklist)
To receive an accurate technical datasheet and commercial quotation, please provide:
Nominal Size (DN / NPS):
Pressure Rating (PN / Class):
Flange & Face-to-Face Standard: (e.g., EN 1092-2 PN16, EN 558 Series 14)
Stem Configuration: Non-Rising Stem (NRS) or OS&Y (Rising Stem)
Operation Method: Handwheel, Square Cap, Gearbox, or Electric/Pneumatic Actuator
Wedge Rubber Seal: EPDM (Potable Water) or NBR
Order Quantity & Destination:
Documentation Requirements: (e.g., EN 10204 3.1 Mill Test Certificate, Third-Party Inspection)
FAQ
Q: What is the difference between AWWA C509 and AWWA C515 gate valves?
A: AWWA C509 applies to resilient-seated gate valves with traditional heavy-wall ductile iron or cast iron bodies. AWWA C515 specifies reduced-wall ductile iron bodies that maintain full structural strength while reducing overall weight and improving flow efficiency.
Q: How do I ensure flange compatibility for replacement projects?
A: In addition to matching the nominal diameter (DN/NPS), you must verify the pressure rating, flange standard (e.g., EN 1092-2 vs. ASME B16.1), face-to-face dimension, pitch circle diameter (PCD), and the bolt-hole count and diameter.
Q: Are these valves suitable for direct burial underground?
A: Yes. Non-Rising Stem (NRS) valves coated with Fusion Bonded Epoxy (FBE) inside and outside can be supplied with an extension spindle and surface box, allowing direct burial without constructing a concrete chamber.
Q: Which sealing material should I select for potable water vs. industrial water?
A: EPDM is the standard choice for drinking water and meets WRAS/NSF 61 requirements. NBR is better suited for raw water, water containing low concentrations of hydrocarbons, or industrial utility water systems.
Q: Can these valves be automated in the field after installation?
A: Yes. Valves configured with an ISO 5211 top flange can be retrofitted with electric or pneumatic actuators directly on site without dismantling the valve bonnet or taking the pipeline out of service.
Hot Tags: flanged end waterworks gate valve, China flanged end waterworks gate valve manufacturers, suppliers, factory, SS NRS Quarter Turn Gate Valve
