Apollo Reduced Pressure Detector Assembly RPDLF4A 2-1/2”

Remove the cover clamp by backing off the reusable locknut until the latch can be disengaged from the T-bolt.

Lift off the cover using a flat screwdriver.

Remove the check-retaining clip by pinching the clip ears together.

Is cleaning of the first check necessary?

Remove the reusable locknuts on the black plastic disc retainer

Remove the check handle and washer and lift the disc retainer and disc out of the body.

Rinse the disc with clean water or replace if necessary.

Test No. 1: Pressure Differential Relief Valve Operation

Open test cock (TC) #4 to establish flow through the RP.

Flush TCs in order without dumping the relief valve

Close test cock #4 and install appropriate adapters in TCs.

Slowly open TC #2 and bleed the high side through the bypass hose by opening the high valve. Close the high valve.

Slowly open TC #3 and bleed the low side through the bypass hose by opening the low valve. Close the bypass and low valves after the gauge pointer reaches the upper end of the scale.

Close the No. 2 shutoff valve and observe if the pressure drops until the relief valve discharges continuously.