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Testing and Test Set-Up (See Test Arrangement Diagram)
Testing
After any repair or adjustments, the H-2 Controlair
Valve should be tested using the following procedures
and test arrangements described in this section.
Pressure control valves need to be tested for the fol-
lowing:
1. Function
4. Flow Capacity
2. Pressure Range
5. Response
3. Leakage
6. Mechanical Detents
The adjustments affecting these points were described
in the previous sections.
General instructions for accomplishing these tests are
listed below.
1.
Function:
The H-2 Controlair Valves are spring re-
turned handle actuated 3-way pressure graduating
valves. The handle actuates the valve to increase,
decrease or maintain graduated air pressure to the
“OUT” port or delivery line.
2.
2. Pressure Range
: Supply pressure at “IN” port
will be delivered as graduated pressure to the
“OUT” or delivery port depending upon the range of
the control spring being used and the handle
position. The handle in the “OFF” or returned
position the “OUT” or delivery port is at minimum
pressure setting. Moving the handle actuates the
graduating control portion to deliver graduated
pressure to the “OUT” or delivery port. Check the
valve to confirm the
Minimum Pressure of 30 psi
(2 Bar) and Maximum pressure of 70 psi
(4.9
Bar).
3. Leakage:
Set supply pressure to 20 psi (1.4 Bar)
above maximum delivery pressure of the valve
being tested. Using soap and water solution, coat
the valve at the pipe bracket and spring housing
parting lines. No leakage is permitted in any handle
position.
A. Port (IN)
1. On all valves with spring ranges less than
90 psi (6.2 bar), set supply line pressure to
100 psi (6.9 bar). Move handle to full travel
position and hold (detent position on detented
valves). Close valve in supply line to “IN” port
or delivery line to isolate graduating valve.
Observe delivery pressure gage in line. 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 the control spring rating.
Moving the handle from “OFF” position to the full
travel position, the delivery volumes should start to
fill within the time limits shown in Table 1.
Move the handle quickly from full travel position
to back to “OFF” position. This should exhaust
volumes within the time limits shown on table 1.
Note:
valves with less than 0 to 35 psi (2.4 bar)
or less rated springs require an additional volume
as shown in test arrangement diagram.
5. Response:
Move valve handle to the full travel
position and hold. Fully open the valve at test vol
ume so that that the air exhausts through the choke
plug. Observe the delivery pressure gage at volume
(1). A pressure drop of no more than 3 psi (0.2 Bar)
is permitted.
6.
Mechanical Detent
(H-2-LX): Move handle to ex-
treme detent position. Connect a spring scale just
under the knob. A minimum of 12 lbs. should be
required to pull the handle out of detent.
Valve
Range
Fill Psi
Maximum
Time-Sec
Exhaust
Psi
Max.
Time
Test
Vol.
0 to15
psi
0 to 15
psi
2 sec
15 to 5
psi
2 sec.
450
cu.in.
0 to20
psi
0 to 15
psi
2 sec
15 to 5
psi
2 sec.
450
cu.in.
0 to25
psi
0 to 15
psi
2 sec
15 to 5
psi
2 sec.
450
cu.in.
0 to30
psi
0 to 15
psi
2 sec
15 to 5
psi
2 sec.
450
cu.in.
0 to 35
psi
0 to 15
psi
2 sec
15 to 5
psi
2 sec.
450
cu.in.
0 to 65
psi
0 to 50
psi
2 sec.
50 to 10
psi
2 sec.
225
cu. In.
0 to
100 psi
0 to 50
psi
2 sec.
50 to 10
psi
2 sec.
225
cu. In.
0 to
125 psi
0 to 50
psi
2 sec.
50 to 10
psi
2 sec.
225
cu. In.
0 to
150 psi
0 to 50
psi
2 sec.
50 to 10
psi
2 sec.
225
cu. In.
0 to 65
psi
0 to 15
psi
2 sec.
50 to 10
psi
2 sec.
225
cu. In.
35 to
85 psi
35 to
70 psi
2 sec,
70 to 40
psi
2 sec.
225
cu. In.
Flow Capacity Tests- Ports 1 & 3
Test Ranges & Times
