Anderson Greenwood

Anderson Greenwood’s premium performance direct spring operated pressure relief valves use special internals and soft seats to provide optimum, accurate performance. Specific valve types are available for gas, vapor, liquid, gas or liquid thermal relief, and steam applications.

Series 60 and 80 Pressure Relief Valves

Types 81 and 83 are direct spring operated valves designed with special patented internals and soft seats to provide superior performance. This range is capable of solving the most difficult pressure relief problems with valves suitable for gas, vapor, and steam service. Type 81 and 83 valves carry the ASME Section VIII Code Stamp.

Orifice Sizes: 0.049 in² [0.32 cm²] and D through J

Connections: 1/2” x 3/4” to 2” x 3”
Inlet Flange Ratings: ANSI 150, 300, 600, 900, 1500, 2500
Maximum Temperature: 550°F [288°C]
Minimum Pressure: 20 psig [1.4 barg]
Maximum Pressure: 10,000 psig [690 barg]

Anderson Greenwood Series 60 and 80 Catalogue – Click to download.

Type 81P Relief Valve for Liquid Service

The Type 81P is a fully back pressure balanced, direct spring operated valve designed specially for liquid service. The valve is fully open at only 10% overpressure and has a pressure-loaded spindle ring to ensure stability with no chatter.

Orifice Sizes: 0.049 in² [0.32 cm²] and E, G and J
Connections: 3/4” x 1” to 2” x 3”
Inlet Flange Ratings: ANSI 150, 300, 600, 900, 1500, 2500
Maximum Temperature: 400°F [204°C]
Minimum Pressure: 50 psig [3.4 barg]
Maximum Pressure: 6,000 psig [414 barg]

Type 81P Relief Valve for Liquid Service Catalogue – Click to download.