Double Check Valve Assembly

Which of the following is working as designed double check valve assembly?

• # 1 check = 1.5 psig, # 2 check = .5 psig

• # 1 check = .9 psig, # 2 check = 2.0 psig

• # 1 check = 1.9 psig, # 2 check = 1.0 psig

• # 1 check = .5 psig, # 2 check = 5.0 psig

when testing the #1 test check of a D/C, the bleed off valve and high side gauge hose must be connected to:

• #1 tc

• #2 tc

• #3 tc

• #4 tc

a leaking #2 shut-off valve can be compensated for by:

• running a by-pass hose from #1 tc to #4 tc

• opening and closing #1 shut-off valve

• filling the site tube with water

• lowering gauge to centerline of assembly

when testing #1 check, a leaking #1 shut-off valve can be compensated for by:

• opening and closing #2 shut off valve

• opening #4 tc

• installing bleed-off valve on #4 tc

• installing bleed-off valve on #2 tc

extreme back pressure on a check valve will cause:

• the disc to imbed into the seat

• the check valve to leak

• a water hammer to condition

• a high gauge reading

when testing the #2 check on a D/C, water continues to flow from #4 TC. The most probable cause would be:

• a leaking #1 check valve

• high side gauge needle open

• #1 TC open

• leaking #2 shut off valve with back-pressure

while testing the #1 check, the tester accidentally opens the high bleed valve. what would the results be:

• have no affect on test because the high and bypass are closed

• cause the gauge to go to "0"

• indicate a leaking #1 shut off valve

• indicate a leaking #2 shut off valve.

what must the tester do when testing double check valve assemblies in a vertical position?

• hold gauge at centerline

• assure #2 shut-off valve is closed tight

• install vertical tube

• test #2 check first