Model 1660 - Pilot Operated Pressure/Vacuum Relief Valve

Pressure and/or vacuum relief valves are used on liquid storage tanks and other process vessels or systems to prevent structural damage due to excess internal pressure or vacuum. The pilot operated relief valve has is bubble tight to set pressure and fully open at less than 10% above set pressure.

Storage tanks are pressurized when liquid is pumped in and compresses the existing vapor or when increasing temperature causes increased evaporation or expansion of existing vapor. Conversely, vacuum may be created when pumping out or decreasing temperature. To prevent damage, vapor must be allowed to escape or enter the tank at a specified pressure or vacuum. The volume rate of venting depends upon the tank size, volatility of the contents, the pumping rate and the temperature. See API Standard 2000 for the procedures to determine venting requirements.

Groth Corporation, 1202 Hahlo Street, Houston, TX 77220. Tel: 713-671-4640; Fax: 713-675-6739.