Apollo Reduced Pressure Detector Assembly RPLF4A 8”

Preliminary Steps for 10” & 12” Models

Remove the 1⁄4” nut holding the flow divider (FD) in place.

Rotate the FD 90° and lift up and out of the valve body.

Is the FD attached to the correct side of the body?

Does the FD’s tab align with the cover of the relief valve body?

Remove the cover coupling by taking off the two bolts and nuts.

Lift off the cover and check if the gasket remains on the valve body.

Remove the locknuts on the check seat

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.