Ames Fire & Waterworks 4000B-FP Bronze Reduced Pressure Zone Assemblies with Gear Operated Slow Close Isolation Valves - Manual (Page 5)

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Test No.1
Purpose: To test check valve No. 2 for tightness against
reverse flow.
Requirements: Valve must be tight against reverse flow under
all pressure differentials. Slowly open the ‘high’ valve A and
the ‘vent’ valve C, and keep the ‘low’ valve B closed. Open
test cock #4. Indicated pressure differential will decrease
slightly. If pressure differential continues to decrease (until the
vent opens) check valve #2 is reported as ‘leaking’.
Test No. 2
Purpose: To test shutoff #2 for tightness.
Requirements: After passing Test No. 1, continue to Test
No. 2 by closing test cock #2. The indicated pressure
differential will decrease slightly. If pressure differential
continues to decrease (approaching ‘zero’), shutoff #2 is
reported to be ‘leaking’.
Test No. 3
Purpose: To test check Valve No. 1 for tightness.
Requirements: Valve must be tight against reverse flow
under all pressure differentials. Close ‘high’ valve A and open
test cock #2. Close test cock #4. Disconnect vent hose at
test cock #4. Open valves B and C, bleeding to atmosphere.
Then closing valve B restores the system to a normal static
condition. Observe the pressure differential gauge. If there is a
decrease in the indicated value, check valve No. 1 is reported
as ‘leaking’.
Test No. 4
Purpose: To test operation of pressure differential relief valve.
Requirements: The pressure differential relief valve must
operate to maintain the ‘zone’ between the two check
valves at least 2psi less than the supply pressure. Close
‘vent’ valve C. Open ‘high’ valve A. Open the ‘low’ valve
B very slowly until the differential gauge needle starts to
drop. Hold the valve at this position and observe the gauge
reading at the moment the first discharge is noted from the
relief valve. Record this as the opening differential pressure
of the relief valve.
NOTICE
It is important that the differential gauge needle drops slowly. Close
test cocks #2 and #3. Use ‘vent’ hose to relieve pressure from test
kit by opening valves A, B and C. Remove all test equipment and
open shutoff #2.
Testing — Reduced Pressure Zone Assemblies
Ball Type Test Valves
(A) (C)
(B)
Needle
Valve
High Hose
(Yellow)
Low Hose
(White or Red)
Vent Hose
(Blue)
Test Cock
No. 1
Test Cock
No. 2
Test Cock
No. 3
Test Cock
No. 4
Auxiliary
Test Cock