Type 310A
11
conditions and on applicable federal, state and local
codes and regulations.
!
WARnIng
To avoid personal injury or property
damage from sudden release of pressure,
isolate the regulator from the pressure
system, and release all pressure from the
pilot and main valve before performing
maintenance operations.
Type 32A Pilots
This procedure describes how the pilot can be
completely disassembled and assembled. When
inspection or repairs are required, disassemble only
those parts necessary to accomplish the job. Refer to
Figures 9 and 14 for key numbers.
Disassembly
The pilot may remain on the main valve for steps 1
through 7; however, it must be removed for steps 8
through 15.
1. Remove the piston seat assembly (key 28) from
the piston guide (key 23).
2. Remove the piston guide (key 23) from the pilot
body (key 22).
3. Check the O-rings (keys 25 and 26), and replace if
worn or damaged.
4. Check the Nylon (PA) disk in the piston seat
assembly, and replace this assembly if worn
or damaged.
5. Remove the retaining ring (key 27), and lift out the
piston and spring (keys 29 and 36). On working
monitor regulators, remove the working pilot spring
(key 36) or the monitoring pilot spacer (key 53,
Figure 14).
6. Inspect the valve seating surface on the small end
of the piston for nicks and scratches.
7. Use a wire with a hooked end to remove the piston
guide bushing O-ring (key 34). Check the O-rings
(keys 30 and 34), and replace if worn or damaged.
8. Disconnect the loading tubing and the external
supply line from the pilot (Figure 2); and remove
the pilot from the main valve.
9. Release control spring compression by loosening
the locknut (key 4) and backing out the adjusting
screw (key 3).
10. To inspect or replace the control spring (key 37),
unscrew spring case cap (key 2) and remove the
control spring and spring seats (key 5).
11. Unscrew the cap screws (key 6), and remove the
spring case (key 1).
12. As one unit, remove the diaphragm spacer
(key 11), yoke (key 16), orifice assembly
(key 12), adaptor (key 17), and valve disk
assembly (key 18).
13. Slide out the relay seat assembly (key 12), and
inspect the O-rings (key 14). Discard the O-rings
if worn or damaged. Also, inspect the seating
surface for nicks and scratches, and replace
if necessary.
14. Push the yoke (key 16) and attached parts
(keys 9, 8, 15, 10, 18, 17, 19, 20, 35, and 21)
through the diaphragm spacer (key 11).
15. Unscrew the adaptor (key 17) from the yoke
(key 16). Unscrew the bleed valve (key 20).
On Single-Pilot Regulators and Wide-Open Monitor
Regulators,
remove the bleed valve seat (key 19), the
spring (key 35), and the valve disk (key 18). Check
that the holes drilled in the side of the bleed valve seat
and the adaptor are both clean and unplugged.
On Working Monitor Regulators,
make sure the plug
(key 52, Figure 14) is firmly in place.
16. Unscrew the cap nut and nut (keys 10 and 21),
remove the diaphragm plates (key 8) and washers
(key 15), and inspect the diaphragms (key 9).
note
The edges of the diaphragms can be
expected to curl up. They will flatten out
within a few minutes depending on the
temperature. Warming them will help,
but do not exceed 150°F (66°C).
Assembly
It is recommended that new diaphragms and O-rings
be installed during assembly. If these parts are to be
reused, be sure that they are carefully inspected and
that no damage has occurred. Lubricate all O-rings.
1. Place the O-ring (key 34) in the piston guide (key 23).
2. Install the O-rings (keys 25 and 26) on the
piston guide.
3. Install the O-ring (key 30) on the piston (key 29).
