Cashco 1/2" FR Back Pressure Valve — Stainless Steel

What pressure, flow and temperature is it rated for?

This valve has a 4.0 PSIG pressure rating. Flow capacity and temperature ratings are not specified in the listing; ask the seller for the specific Cv value and temperature range, which vary significantly across Cashco FR series configurations. Back pressure valves in this size typically handle flows from a few SCFM to several hundred SCFM depending on spring selection and trim.

What materials are the wetted parts?

The listing specifies stainless steel construction but does not detail which wetted components are stainless or the specific alloy (304, 316, etc.). Cashco FR valves typically have stainless steel bodies and trim, with elastomer seats that may be Buna-N, Viton, or other compounds depending on service. Request a full material specification sheet from the seller.

What should I inspect before putting it into service?

Inspect the seat and disc for scoring, erosion, or buildup that would prevent tight shutoff, and verify the spring hasn't taken a permanent set by checking opening pressure against the nameplate or factory curve. Check all threaded connections for damage and verify the diaphragm (if equipped) shows no cracking, stretching, or chemical degradation. Since this is surplus stock, function-test the valve at operating pressure to confirm it maintains downstream pressure within acceptable tolerance before installing in a critical application.