The Flanged Resilient Seated Gate Valve provides bubble-tight shutoff and minimal flow resistance for municipal water distribution, wastewater treatment, and fire suppression networks. Engineered with a non-rising stem and an EPDM/NBR encapsulated wedge, this valve ensures maintenance-free operation across pressure ratings of PN10, PN16, and PN25. Built in our 45,000 m2 foundry and machining facility, every valve undergoes 100% hydrostatic testing per EN 12266-1 before dispatch.
Technical Specifications
|
Parameter |
Specification Details |
|
Size Range |
DN50 to DN1200 (2 inches to 48 inches) |
|
Pressure Rating |
PN10, PN16, PN25 / Class 150 |
|
Design Standard |
EN 1074-2, AWWA C509, ISO 5996 |
|
Flange Drilling |
EN 1092-2 (ISO 7005-2), ASME B16.42 |
|
Face-to-Face |
EN 558 Series 3 (DIN 3202 F4) / Series 15 (F5) |
|
Body & Bonnet Material |
Ductile Iron (EN-GJS-500-7 / ASTM A536 65-45-12) |
|
Wedge Material |
Ductile Iron fully encapsulated with high-purity EPDM or NBR |
|
Stem Material |
Stainless Steel 420 (X20Cr13) or Stainless Steel 316 |
|
Coating |
Fusion Bonded Epoxy (FBE), internal and external, min. 250 um |
|
Operation |
Handwheel, square operating cap, electric actuator, or gearbox |
Key Features
Full, Unobstructed Bore: Straight-through flow path minimizes head loss and prevents debris accumulation in municipal lines.
Resilient Wedge Closure: Ductile iron core vulcanized with high-performance elastomer delivers zero-leakage closure (ISO 5208 Rate A).
Triple O-Ring Stem Seal: Lower thrust collar and upper dual O-rings prevent external leakage; sizes up to DN300 support O-ring replacement under full line pressure.
Corrosion Protection: Electrostatic Fusion Bonded Epoxy (FBE) applied to pre-heated castings ensures uniform coverage (>= 250 um) and chemical resistance.
Foundry Quality Control: Castings produced via automated resin-sand molding lines with verified chemical composition and a spheroidization rate exceeding 90%.
Applications
Potable Water Supply: Municipal water treatment plants, pumping stations, and buried distribution mains.
Wastewater Systems: Effluent lines and sewage treatment facilities (utilizing NBR-lined variants).
Fire Protection Infrastructure: Underground fire main loops and hydrant isolation valves.
Industrial Fluid Circuits: Plant cooling water loops and general utility lines.
OEM & Customization
Actuation Mounting: ISO 5211 direct-mounting pads compatible with electric actuators (Auma, Rotork) and gearboxes.
Dimensional Adaptation: Custom face-to-face lengths or alternative flange drillings (ASME, JIS) for brownfield replacement projects.
Traceability Options: Laser-etched nameplates, custom paint RAL colors, and private-label crating.
Accessory Integration: Supplied with fixed or telescopic stem extensions for deep underground installations.
Testing, Quality & Documentation
Quality management systems operate in compliance with ISO 9001:2015.
Pressure Testing: 100% factory tested on automated hydraulic benches (Shell test at 1.5 x PN, Seat test at 1.1 x PN per EN 12266-1).
Coating Verification: Holiday testing (2.5 kV spark test) and magnetic thickness checks guarantee pinhole-free FBE protection.
Material Traceability: EN 10204 3.1 Material Test Reports (MTRs) provided for pressure-retaining components.
Certifications: Drinking water approvals including WRAS, ACS, and NSF/ANSI 61.
FAQ
Q: What is the maximum operating temperature for EPDM versus NBR seats?
A: EPDM seats handle temperatures up to 120°C for potable water, while NBR seats operate up to 80°C for wastewater and oily fluids.
Q: Can stem O-rings be replaced under pressure?
A: Yes, for DN50 to DN300 sizes, the bonnet design allows O-ring maintenance while the pipeline remains under static line pressure.
Q: What is the standard lead time for container orders?
A: Stock dimensions (DN100–DN300, PN16) dispatch in 20 to 25 days. Custom or large-diameter orders (above DN600) require 35 to 45 days.
Q: Do you accommodate third-party inspections?
A: Yes, inspections by agencies such as SGS, BV, or TUV are welcome prior to final crating.
Request a Quote
To receive a technical datasheet, commercial proposal, and freight cost, please provide:
1.Nominal diameter (DN) and pressure rating (PN)
2.Flange standard and face-to-face requirement
3.Fluid medium and operating temperature
4.Order quantity and destination port (Incoterms 2020)
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