Yard Vacuum User Manual

7
TEST NO. 2:
Purpose:
To test check valve #2 for tightness against reverse flow.
Requirement:
The valve shall permit no through leakage in a
direction reverse to normal flow under all conditions of
a pressure differential.
PROCEDURE:
Same as test #1 except the “high” side hose is
connected to test cock #3 and the “low” side
connected to test cock #4.
RESTORE OPERATION:
Close all test cocks. Remove testing equipment. Open
shut-off valves #1 and #2.
FIGURE 5
Check
#2
Check
#1
#1 Shut-Off
Valve
TC #1
TC #2
TC #3
TC #4
#2 Shut-Off
Valve
“Vent” Hose
Connected in
Procedure
Steps
#7-#10 Only
“High” Side
Connect To:
TC #2 for Test #1
TC #3 for Test #2
“Low” Side
Connect To:
TC #3 for Test #1
TC #4 for Test #2
“Vent” Hose
(Open to Atmosphere
During Test No. 1)
BP #2
BP #1
Legend
Hydraulic Hose
By-Pass (BP) Valve
TC Test Cock
Duplex Gauge or Two
Bourdon Tube Gauges
“Drain” Hose