5
FIGURE 4
EXHAUST
PORT
IF EQUIPPED
(17 - SCREW)
METAL I.D.
TAG
1
CHECK
VALVE “C”
26
SR-4
™
VALVE DISASSEMBLY
(TYPE 1 REFER TO FIG. 4)
REMOVAL AND DISASSEMBLY OF THE PRESSURE
PROTECTION PISTON (FIG. 4)
1. Remove the four round head machine screws which
secure the spring retainer (1) to the valve body. NOTE:
Take caution when removing the spring retainer as it is
spring loaded.
2. Remove the spring (2) and pressure protection piston
assembly (3).
3. Remove the inlet valve (4) from the piston stem and
o-rings (5) from the piston. NOTE: Do not attempt to
remove the retaining ring and stem from the piston.
REMOVAL AND DISASSEMBLY OF THE CONTROL
PISTON
4. Note and mark the position of the control piston cover
(6) on the valve body. Remove the four 1/4 inch -20
hex head cap screws and lock washers which retain
the cover to the body.
5. Remove the cover, seal ring (7), control piston assembly,
and spring (8) from the valve body.
6. From the control piston (9) remove the three o-rings
(10, 11 & 12).
7. Remove the reservoir port fi tting (13) from the valve
body.
8. Remove the o-ring (14) from the reservoir fi tting.
REMOVAL OF CHECK VALVE “C”
9. Place the reservoir fi tting (13) in a vise and remove
retaining ring (23), valve retainer (24), spring (25) and
check valve (26).
10. Remove the inlet valve spring (15), and inlet and
exhaust valve (16).
11. If so equipped, remove the screw (17), washer (18) and
diaphragm (19) from the exhaust port.
REMOVAL OF THE TWO SINGLE CHECK VALVES “A”
& “B”
NOTE:
Figures 2 and 4 show check valve “A” and check
valve “B” out of position for illustration.
12. Remove the two 3/8 inch socket head pipe plugs which
retain the two single check valves in the body.
13. Remove the two check valve springs (20), and rubber
check valves (21).
CHECK
VALVE “B”
21
CHECK
VALVE “A”
21
(18 - WASHER)
(19 - DIAPHRAGM)
2
3
5
4
6
7
9
11
10
12
8
20
20
15
14
16
25
24
13
23
