Apollo Valves DC4A Manual de instalação, operação e manutenção - Página 7
Procurar online ou descarregar pdf Manual de instalação, operação e manutenção para Unidade de controlo Apollo Valves DC4A. Apollo Valves DC4A 12 páginas. 1/2 inch - 2 inch double check valve (dc) backflow preventer
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TEST NO. 3
PURPOSE: To test leaking #2 shut-off valve
As previously mentioned, the above test is not accurate when the second shut-off valve is leaking . The following test will expose
a leaking shut-off valve .
1 .
Both shut-off valves should be open . Make sure all valves on test kit are closed . Connect the high "A" hose to test cock #2
and the low "B" hose to test cock #3 . Open test cock #2 and test cock #3 .
2 .
Open the high "A" valve and vent "C" valve to bleed air from high side of gauge . Open low "B" valve to bleed air from low side
of gauge . Close valves "A", "B" and "C" on test kit .
3 .
Connect the vent hose to test cock #4 . Open test cock #4 .
4 .
Close shut-off valve #2 . The differential gauge needle should read at least 1 .0 psid in order to pass .
5 .
Open the high "A" valve and vent "C" valve . This will put back pressure on check valve #2 .
6 .
Close test cock #2 .
NOTE: If gauge is steady, then shut-off valve #2 is holding tight. However, if gauge drops to zero psid, then shut-off valve #2 is leaking.
NOTE: If the gauge rises then the #2 shut-off valve is still leaking, but is under backpressure from the facility.
Customer Service (704) 841-6000
www.apollovalves.com
BFMM DC4A SBF
Figure 3
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