WATTS Valve 957Z 8"

Test No. 1 - Check Valve No. 2 Tightness

Ensure valves are in correct positions

Record the initial pressure differential

Does the pressure differential decrease slightly?

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

Record the pressure differential after closing test cock #2

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

Ensure the O-ring seal is not overtightened beyond firm hand tightening

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

Remove the rubber diaphragm from the relief valve, noting its configuration for reinstallation

Push up on the piston to expose the piston shaft and remove the E-clip

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

Open test cocks to relieve pressure within the backflow assembly.

Remove #3 test cock from housing after opening to relieve pressure.

For 8" or 10" devices, remove both Victaulic couplers from body and adjust gaskets accordingly.

Remove checks that are to be maintained.

Service Bolt and Spring Mechanism

Locate the service hole and thread in the service bolt by hand until it contacts the linkage.