Ames Fire & Waterworks 5000RPDA Reduced Pressure Detector Assemblies - Manual (Page 4)

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TESTING PROCEDURES:
SERIES 2000DCA AND 3000DCDC
DIAGRAM SHOWS TEST SET-UP
FOR FIRST CHECK
SHUTOFF VALVE 2
Test Number One
Purpose: To test No. 1 check valve for tightness
against reverse fl ow.
TESTING OF NO. 1 CHECK VALVE
STEP NO. 1 Close No. 1 and No. 2 shutoff valves.
STEP NO. 2 Open test cocks No. 2, 3 and 4. Verify
that No. 1 shutoff valve is holding tight by observ-
ing that the discharge of water from test cock No.
2 stops.
STEP NO. 3 Attach test kit “Vent” hose to No. 1 test
cock; “Low” hose to No. 2 test cock and “High” hose
to No. 3 test cock. At this point valves (A) and (C)
should be open and (B) should be closed.
STEP NO. 4 Close test cock No. 4.
STEP NO. 5 Open test cock No. 1. The needle of the
differential gauge will indicate a pressure in excess
of 15 PSID.
STEP NO. 6 Slowly open needle valve (B) until the
differential gauge reads 10 PSID. Then close (B).
The gauge reading will not change if No. 1 check is
holding tight. If No. 1 check is leaking, the gauge will
drop to 0.
Requirements: The check valve shall be tight against
reverse fl ow under all pressure differentials.
TESTING OF NO. 2 CHECK VALVE
STEP NO. 1 Close test cock No. 1.
STEP NO. 2 Open test cock No. 4.
STEP NO. 3 Change “Low” hose from test cock No.
2 to test cock No. 3. Change “High” hose from test
cock No. 3 to test cock No. 4. On the test kit, valves
(A) and (C) should be open and valve (B) should be
closed.
STEP NO. 4 Open test cock No. 1. The pressure
differential gauge will indicate a pressure in excess
of 15 PSID.
STEP NO. 5 Slowly open needle valve (B) until the
gauge reads 10 PSID, then close. If the gauge reading
does not change, No. 2 check valve is holding tight. If
No. 2 check is leaking, the gauge will drop to 0.
NOTE in the above testing: minor leakage in shutoff
valve No. 2 will not affect the test results. However, in
testing the No. 1 check, leaking shutoff valve No. 1
would cause a good fi rst check to fail the test.