API 6A Pneumatic Diaphragm Gate Valve

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API 6A Pneumatic Diaphragm Gate Valve - Surface Safety Valve

Product Description

Pneumatic Diaphragm Gate Valve | API 6A Surface Safety Valve (SSV)

Yulin Machinery's Pneumatic Diaphragm Gate Valve is a fail-safe surface safety valve (SSV) that uses a diaphragm-type pneumatic actuator to automatically shut in wellhead flow during abnormal conditions. Compared to piston-actuated designs, the diaphragm actuator offers a lighter, more economical solution with fewer moving parts — ideal for standard onshore and offshore shut-in applications where simplicity and low maintenance are priorities.

Specifications

The Pneumatic Diaphragm Gate Valve is available in multiple sizes, pressure classes, and material grades to suit different wellhead and flowline conditions. Specifications vary by model and application.

Need an exact spec for your wellhead configuration? Send us your operating pressure, size, and temperature requirements, and our engineers will recommend the right configuration with a detailed datasheet — usually within 24 hours.

Send Your Requirements

How It Works

Like other surface safety valves in our range, the diaphragm actuator operates in a fail-close configuration. Pneumatic pressure applied to the diaphragm head holds the gate open against inlet pressure during normal operation. When an abnormal condition triggers a quick exhaust device, actuator pressure is vented and the valve closes automatically — driven by line pressure on the stem and the compression spring. Restoring pneumatic pressure reopens the valve.

Why Choose a Diaphragm Actuator

The diaphragm design eliminates the metal-on-metal wear concerns of O-ring-based piston seals entirely. Our dual-layer nylon diaphragm requires no lubrication and resists friction wear over long service intervals, making this actuator a lower-maintenance option for standard pressure applications. Every diaphragm actuator design is verified using Finite Element Analysis (FEA) before production, ensuring structural reliability under real operating loads.

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