Pressure Regulator Valve Maintenance; Minimum Pressure/Check Valve Maintenance - Sullair LS-25S Operator's Manual And Parts List

Section 6
MAINTENANCE
250038---673 (valve) and number 250031---738
(coil) and follow the procedure explained below.
Turn off all power, relieve line pressure, and dis-
connect coil lead wires to the valve before making
repairs.
It is not necessary to remove the valve from the pipe
line for repairs.
DISASSEMBLY AND REASSEMBLY
1. Remove the retaining cap and slip the entire so-
lenoid off the solenoid base subassembly.
2. Unscrew the solenoid base assembly. Remove
the core assembly, core spring and body gas-
ket.
3. Next, remove the end cap, body gasket, disc
spring, and disc holder assembly.
4. All parts are now accessible for cleaning or re-
placement. Replace worn or damaged parts
with repair kit number 250038---673 for best re-
sults.
5. Reassemble in reverse order of disassembly.
COIL REPLACEMENT KIT
1. Remove the retaining cap, nameplate and cover.
2. Slip the yoke containing the coil and sleeves off
the solenoid base sub---assembly.
3. Replace with
250031---738.
4. Reassemble in reverse order of disassembly.
PRESSURE REGULATOR
NANCE
Refer to Figur e 6 ---
408275) maintenance normally requires the re-
placement of the internal diaphragm. Use repair kit
number 250028---693 and follow the procedure be-
low for proper installation.
1. Loosen the locknut and turn the adjusting screw
counterclockwise until the inner spring tension
is relieved. The adjusting screw should turn
freely when the spring tension is relieved.
2. Remove the spring housing from the body to al-
low access to internal parts.
3. Next, remove the spring button and the spring.
The dampener will stay inside the spring as it is
removed. Leave the dampener inside the spring
as there is no need to remove it.
4. After removing the spring, remove the gasket
stop and brass gasket.
5. At this time, remove the pressure plate nut and
disassemble the pressure plate, diaphragm,
diaphragm gasket (rubberized asbestos), seat
disc and seat gasket.
6. Remove and discard the seat ring.
7. The next step is to reassemble the regulator us-
ing the new parts provided in your repair kit.
8. Reassemble the diaphragm, pressure plate,
gasket, seat disc and seat disc gasket and
34
WA R N I N G
!
coil replacement
VALVE MAINTE-
11. Pr essure regulator valve (P/N
Figure 6 ---11 Pressure Regulator Valve
number
* Repair Kit P/N 250028---693
tighten the nut. All of these parts with the excep-
tion of the pressure plate are provided in the re-
pair kit.
9. Replace the seat ring with the new seat ring pro-
vided.
10. Replace the existing brass gasket and dia-
phragm gasket stop.
11. Next, place these parts in their proper place on
the body and replace the spring as it was prior to
disassembly.
12. Place the spring button over the spring as
shown.
13. With all parts in order, replace the spring cham-
ber and tighten.
14. Tighten the adjusting screw until tension is real-
ized.
15. At this time, refer to Control System Adjustment
Procedure to readjust the control regulator.
MINIMUM PRESSURE/CHECK VALVE MAINTE-
NANCE
Refer to Figur e 6 --- 1 2
valve (P/N 250033---821) maintenance is quite
minimal. The only part which normally requires re-
placement is the seal ring on the piston. To replace
this ring, order seal repair kit number 250018---262
and follow the procedure explained below.
(P/N 408275)
. Minimum pr essur e/c hec k