Product Overview
Resilient Seated Rising Stem Gate Valves deliver zero-leakage fluid isolation for water supply, sewage treatment, and industrial utility pipelines. Featuring an elastomer-coated wedge and an external OS&Y stem, the valve stem elevates outside the body during opening, providing plant operators with immediate visual confirmation of the valve position.
Designed to eliminate bottom seating pockets, the full-bore body prevents particulate buildup and minimizes pressure drop. Built to international flange and pressure standards, these valves provide long-term corrosion resistance and maintenance-free shutoff performance.
Technical Specifications
|
Item |
Specification Details |
|
Product Type |
Resilient Seated Rising Stem Gate Valve |
|
Design Standards |
BS EN 1074-1/2, BS 5163, AWWA C515 / C509, DIN 3352 |
|
Nominal Diameters |
DN50 – DN600 (2" – 24") |
|
Pressure Ratings |
PN10, PN16, PN25 / Class 125, Class 150 |
|
Face-to-Face Standards |
EN 558 Series 14 / Series 15, DIN 3202 F4 / F5, ANSI B16.10 |
|
Flange Drill Specs |
EN 1092-2, ANSI B16.1 / B16.5, BS 4504, AS 4087 |
|
Body / Bonnet Material |
Ductile Iron GGG40 / GGG50 (EN-GJS-400-15 / EN-GJS-500-7) |
|
Wedge Material |
Ductile Iron Core + EPDM (Water) / NBR (Oily/Wastewater) |
|
Stem Material |
Stainless Steel SS416 / SS304 / SS316 |
|
Coating |
Fusion Bonded Epoxy (FBE) Coating, Minimum Thickness 250 µm |
|
Testing Standards |
EN 12266-1, ISO 5208, API 598 |
|
Operating Temperature |
EPDM: -10°C to +120°C / NBR: -10°C to +80°C |
Key Features of Resilient Seated Rising Stem Gate Valve
OS&Y Visible Stem
External stem thread travels vertically during operation, allowing clear position tracking during routine maintenance.
Zero-Leakage Rubber Wedge
Encapsulated in EPDM or NBR rubber, the wedge compresses against the smooth valve interior for a drop-tight seal.
Full-Bore Unobstructed Flow
The elevated wedge clears the fluid passage completely when fully open, reducing head loss and flow turbulence.
Protected Drive Mechanism
Operating stem threads remain outside the fluid chamber, protecting driving parts from media corrosion and debris.
Dedicated Isolation Service
Specifically engineered for full-open or full-closed duty, preventing seal face erosion from high-velocity media.
Flexible Engineering Configuration
Available with customized flange standards, wall thicknesses, coating specs, and drive options for regional project specs.
Valve Construction
A standard Resilient Seated Rising Stem Gate Valve integrates the following core components:
Valve Body: High-strength Ductile Iron (EN-GJS-450-10 / ASTM A536) for high pressure resistance.
Bonnet: Bolted design allowing easy field inspection and seal replacement.
Resilient Wedge: Ductile iron core fully vulcanized with EPDM or NBR rubber.
Rising Stem: Stainless steel (SS304 / SS316 / SS420) resisting stem necking and corrosion.
Stem Nut: Bronze alloy providing smooth drive engagement and low torque operation.
Stem Seal Assembly: Multi-layer O-ring system replaceable under working pressure.
Bonnet Gasket: Molded rubber seal preventing joint leakage.
Fasteners: Protected steel bolts treated against environmental corrosion.
Operating Mechanism: Manual handwheel, bevel gearbox, or electric drive.
Working Principle
The valve controls line flow through the vertical motion of a resilient wedge:
Opening
Turning the handwheel counterclockwise raises the stem and wedge clear of the flow passage, enabling full liquid velocity with minimal friction.
Closing
Turning clockwise lowers the stem, driving the wedge into the seating zone.
Sealing
The elastic wedge compresses against the body interior, forming a bubble-tight bi-directional seal.
Typical Applications
Potable Water Supply
Delivers non-toxic, zero-leakage line shutoff in municipal drinking water networks.
Wastewater Pipelines
Resists solid buildup and fluid corrosion in sewage intake and treatment lines.
Water Treatment Plants
Provides reliable pump and equipment isolation across treatment processes.
Municipal Utility Networks
Enables quick visual inspection inside accessible piping vaults and plants.
Industrial Utility Piping
Manages cooling water, process supply, and utility lines across industrial sites.
Material Options
Match valve materials directly to your line medium and working conditions:
Body Alloys
• Ductile Iron (GGG50 / ASTM A536): Preferred for high structural strength in underground and pressurized lines.
• Cast Iron (GG25): Cost-effective option for low-pressure utility lines.
Elastomer Covers
• EPDM: Certified for potable water, offering strong resistance to ozone, UV, and water treatment chemicals.
• NBR: Excellent oil, fuel, and municipal wastewater resistance.
Stem Alloys
• Stainless Steel 304 / 316: High resistance to pitting and ambient corrosion in humid plants.
Rising Stem vs. Non-Rising Stem (NRS)
|
Feature |
Rising Stem Gate Valve |
Non-Rising Stem Gate Valve |
|
Stem Motion |
Stem extends upward outside the body during opening. |
Stem rotates internally without vertical motion. |
|
Position Indication |
Direct visual check of valve position. |
Requires turn counting or external position flags. |
|
Thread Protection |
Stem threads stay outside the fluid path. |
Stem threads are exposed to fluid and media particulates. |
|
Space Needs |
Requires overhead installation clearance. |
Compact profile suited for direct burial or tight spaces. |
|
Best Used In |
Exposed piping, treatment plants, and pump stations. |
Underground pipelines and confined vaults. |
Customization & OEM Support
We customize valve builds to align with local tender and plant specifications:
• Custom face-to-face lengths and regional flange drilling patterns
• Electric, pneumatic, or bevel gear actuation setups
• Custom epoxy coating colors and thicknesses (up to 300+ µm)
• Customized valve tagging, casting logos, and export-ready packaging
Export Packaging & Quality Control
To protect critical seals and machined faces during long-distance transit:
• Flange faces feature plastic end protectors against rim damage.
• Stems and handwheels are wrapped in anti-moisture barrier film.
• Valves are packed in heat-treated wooden cases or export pallets.
• Material certificates, pressure test reports, and packing lists are attached to every batch.
FAQ
Q: What is a resilient seated rising stem gate valve?
A: It is a pipeline isolation valve with a rubber-coated wedge and an external stem that moves vertically as the valve opens or closes, providing a tight hydraulic seal and direct visual position tracking.
Q: When should I specify a rising stem gate valve instead of an NRS valve?
A: Choose a rising stem valve for exposed installations like pump rooms or water plants where visual position checks are needed and vertical clearance is available.
Q: Are these valves approved for potable water lines?
A: Yes. Valves built with non-toxic EPDM elastomer wedges and fusion-bonded epoxy coatings meet international clean drinking water requirements.
Q: Can this gate valve be used to throttle line flow?
A: No. Gate valves are designed strictly for full-open or full-closed isolation. Operating in partial positions causes vibration and premature wedge wear.
Q: What details are needed for an accurate quote?
A: Please specify valve size, pressure rating, flange standard, body and stem materials, working medium, temperature range, and required quantity.
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