12
Customer Service
(704) 841-6000
www
.apolloflowcontrols.com
“Apollo”
Flow Controls
INSTALLATION, OPERATION & MAINTENANCE
MANUAL
V. TESTING PROCEDURES
NOTE: This 3 valve test kit procedure may not be approved in all jurisdictions. Consult your local water purveyor for acceptable test
procedures. See Figure 10 for test schematic.
TEST NO. 1
PURPOSE: TO TEST OPERATION OF THE PRESSURE DIFFERENTIAL RELIEF VALVE.
REQUIREMENT:
The pressure differential relief valve must operate to maintain the zone between the two check valves at a minimum of 2 psi less than the
supply pressure.
PROCEDURE:
1. Open test cock (TC) #4 to establish flow through the RP. Flush TCs in the following order taking care not to dump the relief valve. Open and close
TC #1. SLOWLY open and close TC #2. Open and close TC #3. Close test cock #4. Install appropriate adapters in TCs.
2. Connect the high (left) hose to TC #2. Connect the low (middle) hose to TC #3. Fully open the bypass (right) valve.
3. Slowly open TC #2. Bleed the high side through the bypass hose by opening the high valve. Close the high valve.
4. Slowly open TC #3. Bleed the low side through the bypass hose by opening the low valve. After the pointer on the gauge reaches the upper end of
the scale, close the bypass and low valves.
5. Close the No. 2 shutoff valve and observe the pressure drop across check valve No. 1. If the pressure drops until the relief valve discharges
continuously, check valve No. 1 is leaking and must be cleaned or repaired before continuing.
6. Open the high valve.
7. Open the low valve no more than one-quarter (1/4) turn.
8. Watch the pointer on the gauge drop slowly to the opening point of the relief valve and record the reading. If the relief valve does not open, go
to step 10.
9. Close the high and low valves on the gauge and go to test No. 2.
10. The No. 2 shutoff valve may be leaking. Reopen and close No. 2 shutoff valve to attempt a better shutoff. Repeat steps 6 through 8. If the relief
valve does not open, a bypass hose is required (not to be confused with the bypass hose on the gauge).
11. Large leaks may require a garden hose.
12. Attach the bypass hose to TC #1. Bleed hose by opening TC #1. Close TC #1.
13. Connect the bypass hose from TC #1 to TC #4.
14. Open TC #1 to pressurize the hose.
15. Slowly open TC #4. Repeat steps 6 through 8. If the relief valve still does not open, the leaky No. 2 shutoff valve must be repaired.
TEST NO. 2
PURPOSE: IS CHECK VALVE NO. 2 TIGHT AGAINST BACK PRESSURE?
NO BYPASS HOSE USED IN TEST 1
1. Bleed gauge bypass hose by opening the high and bypass valves. Close the bypass valve.
2. Attach the bypass hose to TC #4. Open TC #4.
3. Loosen the low side hose at TC #3 to re-establish the normal reduced pressure within the “zone”. Re-tighten the low hose at TC #3.
4. Open the bypass valve. If the differential pressure stabilizes above the relief valve opening point, check valve No. 2 is recorded as “tight”. Proceed
to test No. 3. If the reading falls to the relief valve opening point, check valve No. 2 is noted as “leaking” and test No. 3 cannot be completed.
BYPASS HOSE USED IN TEST 1
5. Leave the bypass hose connected between TCs #1 and #4. Leave TCs #1 and #4 open.
6. Open the low and bypass valves allowing the pointer to reach the upper part of the scale.
7. Close the low and bypass valves.
8. If the differential pressure stabilizes above the relief valve opening point, check valve No. 2 is recorded as “tight” (proceed to test No. 3). If the
reading falls to the relief valve opening point, check valve No. 2 is recorded as “leaking” and test No. 3 cannot be completed.
V.
TESTING PROCEDURES
