Product Overview
The Rising Stem Wedge Gate Valve provides absolute fluid shut-off and direct visual position monitoring for critical piping isolation. Operating via an Outside Screw and Yoke (OS&Y) mechanism, the stem rises outside the valve body as the gate lifts, allowing plant operators to verify line status at a glance.
When fully opened, the wedge retracts entirely out of the flow stream. This creates a smooth, full-bore passage that minimizes pressure drop, prevents erosion, and eliminates fluid trapping. Precision-manufactured to API 600 and ASME B16.34 standards, this valve delivers long-term sealing performance in demanding steam, oil, gas, and industrial chemical pipelines.
Key Features of Rising Stem Wedge Gate Valve
Visual Position Verification: The external stem rises with operation, providing instant field confirmation of valve status.
Full-Bore Flow Efficiency: Unobstructed internal geometry reduces head loss and allows pigging in process lines.
Bi-Directional Sealing: Symmetrical wedge design provides reliable tight shut-off regardless of flow direction.
Low-Torque Operation: Precision-cut trapezoidal stem threads ensure smooth manual wheel or gear actuation.
Customizable Trim Options: Material combinations match exact line pressure, media corrosivity, and operating temperatures.
Technical Specifications
|
Parameter |
Specification Standard |
|
Valve Type |
Rising Stem Wedge Gate Valve |
|
Design Standard |
API 600, ASME B16.34, DIN 3352 |
|
Stem Design |
Outside Screw and Yoke (OS&Y), External Thread |
|
Gate Mechanism |
Solid Wedge, Flexible Wedge |
|
Nominal Size |
DN50 – DN1200 (2" – 48") |
|
Pressure Class |
PN10 – PN420 / Class 150 – Class 2500 |
|
Body Materials |
Carbon Steel (WCB), Stainless Steel (CF8/CF8M), Alloy Steel (WC6/WC9) |
|
Trim Materials |
API 600 Trim 1 (13Cr), Trim 5 (Stellite), Trim 8 (13Cr/Hardfaced), Trim 10 (SS316) |
|
End Connections |
Flanged (RF, RTJ), Butt-Weld (BW) |
|
Actuation |
Handwheel, Bevel Gear, Electric, Pneumatic |
|
Testing Standard |
API 598, ISO 5208 |
Material & Trim Selection
Carbon Steel (WCB / A105)
Standard choice for non-corrosive fluids, water, oil, and gas operating within temperature limits of -29°C to 425°C.
Stainless Steel (CF8 / CF8M / CF3M)
Required for aggressive chemical media, nitric acid, and marine environments to prevent pitting and stress corrosion cracking.
Alloy Steel (WC6 / WC9)
Engineered for high-temperature power plant steam systems demanding superior resistance to creep and thermal fatigue.
Hardfaced Trim Options
Stellite cobalt-base alloy facing applied to seats and wedges ensures anti-galling performance under high pressure drops.
Target Applications
Oil & Gas Pipelines: Reliable main-line isolation for crude transmission, refining loops, and tank farm manifolds.
Power Generation: High-pressure steam shut-off and boiler feedwater isolation in conventional power stations.
Chemical Processing: Fluid containment for solvents, hydrocarbons, and aggressive process fluids.
Water Infrastructure: Heavy-duty isolation in high-pressure water distribution mains and pumping stations.
Industrial Utilities: Distribution control for plant steam, cooling water, and compressed gas networks.
Comparative Analysis: Rising Stem vs. Non-Rising Stem
|
Feature |
Rising Stem Gate Valve |
Non-Rising Stem Gate Valve |
|
Stem Motion |
Stem moves upward visibly when opening |
Stem rotates internally without vertical lift |
|
Position Indication |
Direct visual verification of valve position |
Requires mechanical indicator or transmitter |
|
Installation Space |
Requires vertical clearance for stem extension |
Compact design suited for underground/tight space |
|
Maintenance |
External stem threads are easy to clean and lubricate |
Internal threads are exposed to fluid corrosion |
Quality Control & Inspection
Material Traceability: EN 10204 3.1 Material Test Certificates provided for body, bonnet, and pressure-retaining components.
Pressure Testing: 100% shell hydrostatic test and high-pressure seat leakage test per API 598.
Dimensional Inspection: Flange thickness, raised-face finish, and face-to-face dimensions verified against ASME B16.10.
NDT Options: Radiographic (RT), Liquid Penetrant (PT), and Positive Material Identification (PMI) available upon request.
Packaging & Export Protection
• Machined flange faces are coated with rust-inhibiting grease and sealed with heavy-duty protective covers.
• Valve bodies are wrapped in moisture-proof barrier foil to prevent atmospheric oxidation during transit.
• Crating is completed using reinforced, heat-treated wooden boxes suitable for long-distance ocean freight.
FAQ
Q: What is the primary function of a Rising Stem Wedge Gate Valve?
A: It provides full-bore on/off isolation in fluid pipelines, featuring an external stem that visually indicates whether the valve is open or closed.
Q: Why choose a rising stem over a non-rising stem valve?
A: Rising stem valves allow operators to confirm valve position immediately and keep stem threads outside the process fluid for easier lubrication and longer service life.
Q: Can this valve be used for flow throttling or pressure control?
A: No. Gate valves must be fully open or fully closed. Operating in a partially open position causes fluid turbulence, vibration, and severe erosion damage to the seats.
Q: What technical details are needed to request a price quote?
A: Specify nominal pipe size, pressure rating, body and trim materials, end connection type, operating temperature, and flow medium.
Q: Which testing standards are followed during production?
A: Pressure testing, shell strength testing, and closure tightness testing are performed according to API 598 or ISO 5208 standards.
Q: What mill certificates are included with the shipment?
A: Shipments include EN 10204 3.1 Material Test Certificates, Hydrostatic Test Reports, and Dimensional Inspection Records.
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