Anderson Greenwood Series 80
Special Internals and soft seats provide optimum, accurate performance.
Type 81 Safety Relief Valve:
Best suited for cryogenic, high set pressure, and chemically active applications. The Type 81 has an inert plastic seat suitable for a wide range of products, pressures, and temperatures involving gas, vapor, and liquid or gas thermal relief applications. It maintains tightness close to set pressure, opens fully at set pressure and provides a safe, external adjustment for short blowdown.
Type 83 Safety Relief Valve:
Best suited for hard-to-hold gases and vapors and general gas or vapor service. The Type 83 has an elastomer seat and is ideal for gas processes that operate close to set pressure, controlling valuable or polluting gas products that should not be lost to the atmosphere. It is also well suited for liquid or gas thermal relief applications. It maintains tightness close to set pressure, opens fully at set pressure and provides a safe, external adjustment for short blowdown.
Type 81P Relief Valve:
Made especially for the unique demands of liquid service. The spindle assembly of the Type 81P uses three replaceable sealing members: a specially engineered plastic seat and two elastomer seals. The two seals help balance against back pressure and stabilize against destructive chatter. The nozzle fits closely with the guide, providing perfect alignment for the spindle. Multiple discharge holes in the guide provide free discharge of the relieving flow to the valve outlet. The spring chamber is isolated by the guide seal and the back pressure (balancing) seal on the stem of the spindle and is vented to the atmosphere enabling the valve to remain fully balanced and operational without the need for an expensive bellows.
