WATTS Valve 957Z 6"

Ensure shutoff valves are closed

Open test cocks to relieve pressure

Remove #3 test cock from housing

Rotate and slide cover sleeve to break O-ring seals

Remove stainless steel check retainer from housing

Test No. 1 - Check Valve No. 2 Tightness

Ensure valves are in correct initial positions

Observe the indicated pressure differential

Does the pressure differential continue to decrease until the vent opens?

Report check valve #2 as ‘leaking’ if pressure differential continues to decrease

Test No. 2 - Shutoff #2 Tightness

Observe the indicated pressure differential

Shut down water system by closing both the inlet and outlet shutoff valves

Relieve pressure within the assembly by opening the #2, #3, and #4 test cocks

Disconnect the hose from the bottom cover plate to the relief valve

Unscrew the relief valve from the housing

Remove the cover plate of the relief valve by removing the four connecting screws

Remove the rubber diaphragm from the relief valve

Push up on the piston until the piston shaft with the attached E-clip is exposed and remove the E-clip