Steam Trap Test Valves

The WSTTV Steam Trap Test Valve offers simple, immediate, and visible diagnosis of any steam trap. Turning the handle 90° to the “Test” position will direct flow of steam trap out the test port for visual evaluation of discharge.
  • Seal welded construction
  • Full stainless steel construction
  • Fully compliant with ASME B16.34 & API 608
  • NACE MR-01-75 compliant
  • Standard locking stainless steel handles
  • Single reduced bore/full porting (depending on size)

Catalog Spec Sheet (pdf)
I&M (pdf)
Condensed I&M (pdf)

ModelSizeTypeMax PMO (psig)Weight (lbs)


With the WSTTV Steam Trap Test Valve installed downstream of the trap and in the open position, the steam trap discharges normally. A quarter-turn of the handle repositions the specially designed ball and diverts the trap discharge through a port on the bottom of the valve. Discharge can then be observed and assessments made regarding the operation of the steam trap.

Test Valve to be mounted on the outlet side of the steam trap. Care should be taken to ensure that the discharge port will be positioned in such a manner so as to avoid danger to personnel. NOT AN ISOLATION OR STOP VALVE.