A variation of the F70PR pilot operated relief valve (shown on the Pressure Relief Valves page), with pilot tubing rearranged to support vacuum operation.  Atmospheric pressure, present at the valve inlet or outlet, depending on the application, provides the lift force required to open the main piston once the vacuum set point is reached.  Backflow preventers are available to prevent valve opening on loss of vacuum.

Connections:  1.5" FNPT & 2" - 12" flanged system connection.
Set Pressures:  Min. 0.2 - 2.7 psi vacuum (varies by valve size) Max. 14.6 psi vacuum
Temperature Range:  -65 to +400 °F

For F70VP Series Catalog , click here