11
Customer Service
(704) 841-6000
backflow.apollovalves.com
ES1595 REV A.
BFMMDC4S00
NOTE: Test set-up is illustrated in Figure 8 for 1/2” through 2” and Figure 9 for 2-1/2 through 10”.
EQUIPMENT REQUIRED:
Differential pressure gauge type test kit such as Model No. 40-200-TKU or 40-200-TK5U.
NOTE: For all testing, the gauge and open ends of hoses not being used must be held at the same level as the assembly being tested.
TEST NO. 1:
PURPOSE: TO DETERMINE THE STATIC PRESSURE DROP ACROSS CHECK VALVE NO. 1.
REQUIREMENT:
The static pressure drop across check valve No. 1 shall be at least 1 psid.
PROCEDURE:
1. To eliminate foreign material, flush all four test
cocks, one at a time.
2. 2. Open test valves No. 1 and No. 2 on the gauge and close test valve No. 3. Attach “high” side hose to test cock No. 2.
3. Bleed all air from hose and gauge by slowly opening test cock No.2. Then slowly close test valve No. 2.
4. Close the outlet shut-off valve. Then close the inlet shut-off valve.
5. Slowly open test cock No. 3. After the gauge reading stabilizes and water stops running out of test cock No. 3, the static pressure drop
across the check valve indicated by the gauge and is recorded as such.
NOTE: If water continues to discharge from test cock No. 3 then a leaky shut-off valve is evident and should be repaired or bypassed
before testing continues. If the water recedes from the test cock opening then move the gauge to a point level with the centerline of
the check seat area and record the gauge reading as the static pressure differential across check No. 1.
TEST NO. 2:
PURPOSE: TO DETERMINE THE STATIC PRESSURE DROP ACROSS CHECK VALVE NO. 2.
REQUIREMENT:
The static pressure drop across check valve No. 2 shall be at least 1 psid.
PROCEDURE:
1. Open test valves No. 1 and No. 2 on the gauge and close test valve No. 3. Attach “high” side hose to test cock No. 3.
2. Bleed all air from hose and gauge by slowly opening test cock No. 3. Then slowly close test valve No. 2.
3. Close the outlet shut-off valve. Then close the inlet shut-off valve.
4. Slowly open test cock No. 4. After the gauge reading stabilizes and water stops running out of test cock No. 4, the static pressure drop across the
check valve is indicated by the gauge and is recorded as such.
NOTE: If water continues to discharge from test cock No. 4 then a leaky shut-off valve is evident and should be repaired or bypassed
before testing continues. If the water recedes from the test cock opening then move the gauge to a point level with the centerline of
the check seat area and record the gauge reading as the static pressure differential across check No. 2.
VIII. TESTING PROCEDURES
