Wilkins Valve 375XL

Open by-pass valve 'B' very slowly until differential gauge needle starts to drop

Observe the gauge reading at the moment the first discharge is noted from the relief valve

Record the opening differential pressure of the relief valve

Is the opening differential pressure at least 2 PSID less than the supply pressure?

Close test cock #4, and disconnect "VENT" hose from test cock #4

Open by-pass valves "B" and "C" bleeding to atmosphere

Close by-pass valve "B" restoring the system to normal static condition

Observe the pressure differential gauge and note this as the #1 check valve PSID

Is the static pressure drop across #1 check valve greater than the relief valve opening point and at least 5.0 psid?

Close inlet and outlet shut-off valves

Open test cocks to release pressure from valve

Unscrew screws holding body down and lift valve body upward

Twist and remove sleeve from body

Push in outlet end of body to slide out checks

Twist spring retainers counter-clockwise to remove from seat and access poppets

Inspect the rubber seal ring for cuts or embedded debris

Inspect seat surface for nicks or dings and replace if necessary

Attach the 'HIGH' hose to test cock #2

Attach the 'LOW' hose to test cock #3

Open by-pass valves 'C' and 'A' and bleed to atmosphere until all air is expelled

Clean all parts thoroughly with water after disassembly

Describe any issues found during inspection

Was the unit tested for proper operation according to 'Testing Procedures'?