API 6A Pneumatic Piston Gate Valve - Surface Safety Valve
API 6A Pneumatic Piston Gate Valve - Surface Safety Valve
Product Description
Pneumatic Piston Gate Valve | API 6A Surface Safety Valve (SSV)
Yulin Machinery's Pneumatic Piston Gate Valve is a fail-safe surface safety valve (SSV)used to automatically shut in wellhead flow during abnormal pressure or emergency conditions. Built with a piston-type actuator, segment seal design, and high-strength compression springs, it is engineered for reliable fail-close performance in onshore and offshore oilfield applications.
Key Specifications
|
Valve Type |
Pneumatic Piston Actuated Surface Safety Valve (SSV) |
|
Failure Mode |
Fail-close |
|
Applicable Standards |
API 6A, NACE MR-01-75 |
|
Pressure/Vent Port |
1/2" NPT |
|
Available Sizes & Pressure Classes |
Custom-engineered per project requirements |
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How It Works
The valve operates in a fail-close configuration. During normal operation, pneumatic pressure in the actuator holds the gate open against inlet pressure. If an abnormal condition is detected, actuator pressure is released through a quick exhaust device, allowing the gate to close automatically — driven by inlet pressure on the valve stem and the compression spring force. Once conditions are normal again, the valve can be reopened by restoring pneumatic pressure to the actuator.
An optional vent port and slam-fire system can be configured to close the valve immediately in the event of gate failure.
Design Features
- Segment seal + Poly-pak design: Replaces traditional O-ring piston seals to prevent wear, misalignment, and distortion, extending actuator service life.
- Stem protection: Wear-resistant bearings separate the stem and valve rod from metal-to-metal contact, reducing twisting forces transmitted to gate and seat.
- Top-mounted seal assembly: Stem seal can be replaced without disassembling the actuator, with a rod scraper to extend service life of position indication components.
- High-strength compression springs: Industry-leading spring force ensures positive valve closure; springs ship relaxed for safe, tool-free installation.
- 360° rotatable actuator body: Bottom swivel plate allows full rotation to suit piping orientation requirements.
- Easy maintenance: Bonnet and actuator assemblies are designed for quick disassembly and field repair using standard tools (6 hex socket head cap screws).
Piston vs. Diaphragm Actuator: Which One Do You Need?
Applications
- Onshore and offshore oil & gas productionflowlines
- Automatic emergency shutdown (ESD) systems
Available Accessories
- Thermal sensitive switches
- Manual handwheel override
- Hydraulic pilots
- Position indicators
- Remote control equipment
- Quick exhaust devices
- Valve stem protectors
Frequently Asked Questions
Can the valve be customized for specific well conditions?
What standards does this valve comply with?
Request a Quote
Tell us your size, pressure rating, and application requirements — our engineers will recommend the right configuration and provide a quotation within 24 hours.
For more information, please visit our website.
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