TESTING AND TEST SET-UP
Page 12
After repair or adjustment, the H-3 CONTROLAIR
®
Valve
should be tested using procedures and test arrangements
as described in this section.
Pressure control valves of this nature should be tested for
the following:
1. Function
2. Pressure range
3. Leakage
4. Flow capacity
5. Response
The adjustments affecting these points have been
described in the previous section. General instructions for
accomplishing the five tests above are as follows:
1. FUNCTION:
The H-3 CONTROLAIR Valves are cam
roller actuated 3-way pressure graduating valves. A
roller actuates the valve to increase, decrease or
maintain graduated air pressure to a separate delivery
line. The roller is spring returned from all positions. This
function should be checked using the test arrangement
shown.
2. PRESSURE RANGE:
Supply pressure at “IN” port will be
delivered as graduated pressure to “OUT” port delivery
line depending on the strength of control spring being
used and roller position. In release pressure position the
out delivery line is at minimum pressure setting. Forcing
the roller down actuates the graduating control portion to
deliver graduated pressure to the out delivery line. See
ADJUSTMENTS, TESTING AND TEST SETUP on page
9 to adjust valve. After valve is adjusted, check that
minimum and maximum pressure ranges are generated
in delivery line per IDENTITY SCHEDULE on page 5.
3. LEAKAGE:
Set supply pressure to 20 psi (1.4 bar) above
maximum delivery pressure of valve being tested. Using
soap solution, coat the valve at pipe bracket and spring
housing parting lines. No leakage is permitted in any
handle position.
A. On all valves with spring ranges less than 100 psi
(6.9 bar), set supply line pressure to 100 psi (6.9
bar). Move cam roller to full travel position and hold.
Close valve in supply line to “IN” port, and valve in
delivery line from “OUT” port to trap the supply
pressure at the valve. Observe the “OUT” delivery
line pressure gauge. A pressure drop of no more
than 2 psi (0.14 bar) in 30 seconds is permitted.
Release cam rollers.
B. On all valves with spring ranges 100 psi (6.9 bar)
and above, set supply line pressure to 100 psi (6.9
bar). Move cam roller to deliver 95 psi (6.6 bar) to
delivery line from “OUT” port. Close valve in supply
line to “IN” port, and valve in delivery line from “OUT”
port to trap the supply pressure at the valve.
Observe the “OUT” delivery line pressure gauge. A
pressure drop of no more than 2 psi (0.14 bar) in 30
seconds is permitted.
4. FLOW CAPACITY:
Set supply line pressure to 100 psi
(6.9 bar) regardless of control spring rating of valve.
Move cam roller to full travel position. The delivery
volume or volumes from “OUT” port should be inflated to
specified pressure within time limits shown on
Table 1, Flow Capacity.
Release cam roller quickly from full travel position to
release position. The delivery volume or volumes
connected to “OUT” port should be “exhausted” within
time limits shown in Table 1.
5. RESPONSE:
Move cam roller to full travel position. Fully
open the valve at delivery volume so that air exhausts
through the choke plug. Observe the delivery pressure
gauge. A pressure drop of no more than 3 psi (0.2 bar) is
permitted. Release cam roller.
Table 1
Flow Capacity Tests—Port “OUT”
TEST RANGES & TIME
TEST
VOLUME
[CU. IN.]
FILL [PSI] MAX TIME
[SEC]
EXHAUST
[PSI]
MAX TIME
[SEC]
0-15 psi
0 incr. to 15
1
15 decr. to 5
2
450
0-25 psi
0 incr. to 15
1
15 decr. to 5
2
450
0-65 psi
0 incr. to 50
2
50 decr. to 10
2
225
0-70 w/FP
0 incr. to 50
2
50 decr. to 10
2
225
0-72 w/FP
0 incr. to 50
2
50 decr. to 10
2
225
0-75 psi
0 incr. to 50
2
50 decr. to 10
2
225
0-100 psi
0 incr. to 50
2
50 decr. to 10
2
225
0-125 psi
0 incr. to 50
2
50 decr. to 10
2
225
0-150 psi
0 incr. to 50
2
50 decr. to 10
2
225
0-175 psi
0 incr. to 50
2
50 decr. to 10
2
225
15-50 psi
2
50 decr. to 20
2
225
VALVE
SETTING
