Product Overview
The Rising Stem Resilient Seated Gate Valve provides leak-tight isolation for pressurized water, wastewater, and utility pipelines. It features an external threaded stem that moves vertically with the handwheel, offering clear, physical visual confirmation of the valve position from a distance.
Equipped with an elastomer-encapsulated wedge, the valve achieves a bubble-tight, zero-leakage seal against the smooth interior body. Its full-bore design minimizes pressure drop and turbulence, making it a low-maintenance solution for main supply lines, pump stations, and industrial distribution networks.
Working Principle
A gate valve controls fluid flow by raising or lowering a wedge across the flow channel.
When opened, the stem travels upward through the bonnet, lifting the wedge completely out of the pipe bore to allow unobstructed flow. When closed, the stem pushes the elastomeric wedge into the body seating area, compressing the resilient seal to stop fluid movement entirely.
Open State: Wedge fully retracted; full-port flow with minimal friction.
Travel State: Stem moves vertically through the bonnet to indicate position.
Closed State: Elastomer wedge compresses against the body for positive shut-off.
Key Features of Rising Stem Resilient Seated Gate Valve
Visual Position Indication
The external stem moves vertically during operation, allowing immediate visual verification without position sensors.
Zero-Leakage Seating
The rubber-encapsulated wedge forms a bidirectional, bubble-tight seal even in pipelines carrying fine particles.
Full-Bore Design
The unobstructed internal bore reduces pressure loss and prevents sediment accumulation inside the valve.
Bidirectional Isolation
Seals effectively against flow coming from either direction, simplifying installation in complex piping layouts.
Universal Flanged Ends
Flange dimensions comply with international piping standards for quick integration into existing systems.
Manual Actuation
The ergonomic handwheel offers reliable manual operation without requiring external power.
Custom Engineering
Configurations can be customized by pressure rating, flange drilling, body material, and protective coatings.
Technical Specifications
|
Parameter |
Standard Range |
Project Options |
|
Nominal Size |
DN50 – DN600 (2" – 24") |
Up to DN1200 (48") |
|
Pressure Class |
PN10, PN16, PN25, Class 150 |
Class 300 / Custom |
|
Working Temperature |
-10°C to +80°C (EPDM) |
Up to +120°C (NBR / High-Temp) |
|
Applicable Media |
Potable water, raw water, sewage |
Industrial process fluids |
|
Flange Standards |
EN 1092-2, ASME B16.5, BS 4504, JIS B2220 |
GB/T, AWWA C219 |
|
Testing Standards |
EN 12266-1, API 598, ISO 5208 |
Custom hydro testing |
Material Construction
Body & Bonnet: Ductile Iron (GGG50 / EN-GJS-500-7) for high strength and surge resistance.
Wedge: Ductile iron core fully encapsulated with vulcanized EPDM or NBR rubber.
Stem: Stainless Steel (AISI 420, 304, or 316) for corrosion resistance and precise threading.
Seat / Seals: Drinking-water approved EPDM or oil-resistant NBR.
Coating: Fusion-bonded epoxy (FBE) coating (minimum 250 microns) applied internally and externally.
Target Applications
Municipal Water Supply
Isolates main trunk lines and underground distribution networks.
Water & Wastewater Treatment
Serves as reliable shut-off valves in filtration systems and effluent processing.
HVAC & Building Services
Manages isolation in cooling towers, chilled water circulation, and heating loops.
Industrial Utilities
Controls water supply lines, washdown systems, and utility fluid loops across factories.
Agricultural Irrigation
Provides main line control in agricultural water distribution systems.
Fire Protection Networks
Functions as an isolation valve in commercial fire water storage and main supply lines.
Rising Stem vs. Non-Rising Stem Gate Valves
|
Feature |
Rising Stem (OS&Y) |
Non-Rising Stem (NRS) |
|
Stem Movement |
Extends upward outside the body |
Rotates internally without rising |
|
Position Indication |
Direct visual indication |
Requires a mechanical indicator |
|
Overhead Clearance |
Requires higher vertical clearance |
Compact vertical profile |
|
Thread Location |
External threads; easy inspection |
Internal threads exposed to media |
|
Primary Use |
Above-ground piping and pump rooms |
Underground pits and tight spaces |
Buying Guide
|
Nominal Size (DN/NPS) |
Matching the pipeline requirements. |
|
Pressure Rating (PN/Class) |
System design and test pressure limits. |
|
Fluid Medium |
Water, sewage, or specific industrial fluids. |
|
Operating Temperature |
System temperature range. |
|
Flange Standard |
EN, ASME, BS, or JIS bolt patterns. |
|
Material Specifications |
Body, stem, wedge, and elastomer grades. |
|
Operation Type |
Standard handwheel, gearbox, or actuator preparation. |
|
Testing & Certificates |
Hydrostatic testing, drinking water approvals, or mill test reports. |
|
Clearance Constraints |
Available vertical space for stem extension. |
Quality Control & Inspection
Material Verification: Spectral analysis and material test certificates for castings.
Dimensional Inspection: Verification of flange dimensions, face-to-face lengths, and bolt patterns.
Hydrostatic Pressure Testing: 100% shell and seat testing in according with EN 12266-1 or API 598.
Coating Thickness Check: Magnetic thickness testing and pinhole inspection on FBE coatings.
Operational Check: Smooth full-stroke stroke verification under pressure.
Export Packaging Verification: Inspection of protective flange caps, wooden casing, and shipping marks.
Why Choose Us
Direct engineering support matches valve configurations precisely to project requirements before manufacturing.
Every order undergoes material verification, dimensional checks, and 100% pressure testing prior to dispatch.
Efficient manufacturing and material sourcing provide competitive pricing without compromising service life.
Simplifies procurement by supplying gate valves alongside butterfly, globe, check, and ball valves, strainers, and pipe connectors.
Packaging & Delivery
Flange Surface Protection: Plastic caps and end covers protect machined sealing faces from damage.
Export-Grade Casing: Packed in fumigated wooden cases or secured on heavy-duty pallets.
Stem Protection: Exposed stem threads are greased and wrapped with protective covers.
Clear Shipping Marks: Exterior packaging features clear size, weight, heat number, and destination details.
FAQ
Q: How does a rising stem valve differ from a non-rising stem valve?
A: A rising stem valve moves upward outside the body, providing clear visual position indication, whereas a non-rising stem valve rotates inside the body and requires less vertical space.
Q: Which media are suitable for resilient seated gate valves?
A: They are primarily used for clean water, raw water, and wastewater. EPDM is standard for water applications, while NBR is recommended for media containing oils or chemicals.
Q: Can this valve be used for flow throttling?
A: No. Gate valves should be used only in fully open or fully closed positions. Throttling causes seat erosion and rapid wear on the elastomeric wedge.
Q: What information is needed for a fast quotation?
A: Provide the nominal size, pressure class, fluid medium, operating temperature, flange standard, material preferences, and destination.
Q: Can other valve types be included in the same shipment?
A: Yes. Orders can combine gate valves with butterfly, globe, check, and ball valves, as well as strainers, expansion joints, and pipe repair clamps.
Hot Tags: rising stem resilient seated gate valve, China rising stem resilient seated gate valve suppliers
