Page 12
Testing
After any repair or adjustments, the HG-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
following:
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 instruction for accomplishing these test
are listed below.
1.
Function:
The HG-2 Controlair valve is a 4
way exhausted center valve capable of
graduating pressure in one or the other
delivery lines. This function must be checked
using the test arrangement to insure that only
one volume is charged in either direction of
handle travel.
2.
Pressure Range:
The minimum and
maximum pressure range generated in the
delivery line is specified by the control spring
in use. See the graduated output pressure
setting
Adjustment Section
. After the valve is
adjusted, confirm that the minimum and
maximum pressure ranges are generated in
the delivery line as per the
Identity Schedule
by moving the handle from neutral to first 10°
then to the full travel position on both sides of
center.
3.
Leakage:
Set supply pressure to 20 psi
above maximum delivery pressure of the
valve being tested. Using a 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
1. On all valves with spring ranges less than
90 psi (6.2 bar), set supply line pressure
to 100 psi (6.9 bar) handle to full travel
position and hold (detent position on
detented valves). Close valve in supply
line to port (2) and valve in delivery line
(1) to isolate graduating valve. Observe
delivery pressure gage in line (1). A
pressure drop of no more than 2 psi (0.14
bar) in 30 seconds is permitted.
2. On all valve with spring ranges of 100 psi
(6.9 bar) and above, set supply line
pressure to 100 psi (6.9 bar). Move valve
handle to deliver 95 psi (6.6 bar) to
delivery line (1) and hold in that position.
Closed valve in supply line to port (2) and
valve and valve in port (1) delivery line to
isolate the graduating valve. Observe the
delivery gauge in line (1). 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
neutral position in either direction to full
travel position. The delivery volume (1)
should start to fill within the time limits
shown in Table 1.
Move the handle quickly from full travel
position to back to neutral position. This
should exhaust volume (1) with the time
limits shown on table 1.
Note
valve with less than 0 to 35 psi (2.4
bar) or less rated springs required an
additional volume as shown in test
arrangement diagram.
5. Response
A. Port (1) Move valve handle to the full
travel position and hold. Fully open the
valve at test volume (1) so 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 (0.21 bar) permitted.
B. Port (3) Repeat test 5A for opposite
direction of handle travel.
Testing and Test Set-Up
Flow Capacity Tests - Ports 1 & 3
Test Ranges & Times
Valve
Range
Fill Psi Maximum
Time-Sec.
Exhaust
Psi
Mx.
Time
Test
Vol.
0 to 15
psi
0 to 15
psi
2 sec.
15 to 5
psi
2 sec.
450
cu. in.
0 to 20
psi
0 to 15
psi
2 sec.
15 to 5
psi
2 sec.
450
cu. in.
0 to 25
psi
0 to 15
psi
2 sec.
15 to 5
psi
2 sec.
450
cu. in.
0 to 30
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.
