Section 6
MAINTENANCE
28
3. Remove and discard the old o--ring on the poppet
guide and replace it with the new o--ring provided
in the kit. Be sure to lubricate the o--ring with a sili-
cone base lubricant such as Parker Super “O”
lube or an equivalent quality grease.
4. Place the new spring and poppet assembly in the
valve body as shown. Then place the poppet
guide (with the o--ring in position) over the poppet
assembly.
5. Push the hex nut down over the poppet guide and
compress the spring while turning the hex nut until
tight. Tighten securely with a wrench.
6. Remove the pilot cap from the top of the valve
body and pull the piston out of the cap.
7. Remove the U--cup from the piston and replace it
with the new one provided in the kit. The U--cup
should be lubricated with a silicone base lubricant
also.
8. Remove the gland nut from the valve body and pull
the poppet pin out to allow access to the small o--
ring in the top of the body.
9. Remove the small o--ring and replace it with the
new one provided in the kit. The o--ring must be
lubricated with a silicone base lubricant.
10. Replace the poppet pin and gland nut.
11. Place the piston with the new U--cup in position
back in the pilot cap with the recessed side show-
ing at the valve body end of the cap.
12. Replace the pilot cap and tighten securely with a
wrench. As this time the running blowdown valve
is ready to be installed for operation.
T HE RM AL VALV E M AI NT E NANCE
. F or t her m al v alv e ( P / N
250001--456) maintenance, order the following Sull-
air parts: one (1) quad ring (P/N 046425), one (1)
gasket (P/N 049812) and if necessary, thermal ele-
ment P/N 250001--349. Follow the procedure ex-
plained below for installation.
DISASSEMBLY
1. Remove the appropriate piping from the thermal
valve before starting disassembly.
2. Remove the four (4) capscrews holding the hous-
ing together and separate the upper housing from
the lower housing.
3. Pull firmly on the thermal element and remove.
NOTE
There will be a slight resistance from the seal ring
centered in the lower housing.
4. Remove the seal ring from the lower housing and
discard.
REASSEMBLY
1. Grease and replace the gasket in the center of the
lower housing.
2. Reinsert the thermal element by pushing down
until the brass ring is flush with the surface of the
lower housing.
* Element Replacement Kit P/N 250001-349
** Quad Ring Seal Replacement Kit P/N 046425
*** Gasket Replacement Kit P/N 049812
*
*
*
*
*
*
Figure 6-11 Thermal Valve (P/N 250001-456)
3. Position a new quad ring over the thermal ele-
ment.
4. Place the upper housing on the lower housing and
retighten the capscrews.
5. Replace all piping connected to the thermal valve.
MINIMUM PRESSURE/CHECK VALVE MAINTE-
NANCE
. M inim um pr es s ur e/ c hec k
valve (P/N 018498A) maintenance is quite minimal.
The only part which normally requires replacement is
the seal ring on the piston. To replace this ring, order
seal repair kit No. 018514A and follow the procedure
explained below.
WARNING
!
Before performing maintenance on the valve, be
sure that all pressure has been relieved in the com-
pressor sump, and all downstream pressure has
been vented to the atmosphere. Also be sure that
Summary of Contents for 20/12 500 CFM
Page 12: ...Section 2 DESCRIPTION 8 Figure 2 3 Piping and Instrumentation...
Page 14: ...Section 2 DESCRIPTION 10 Figure 2 5 Capacity Control System Typical...
Page 18: ...14 NOTES...
Page 20: ...16 NOTES...
Page 24: ...20 NOTES...
Page 38: ...34 NOTES...
Page 40: ...Section 7 ILLUSTRATIONS AND PARTS LIST 36 7 3 MOTOR FRAME COMPRESSOR AND PARTS...
Page 42: ...Section 7 ILLUSTRATIONS AND PARTS LIST 38 7 4 AIR INLET SYSTEM...
Page 44: ...Section 7 ILLUSTRATIONS AND PARTS LIST 40 7 5 COOLING AND LUBRICATION SYSTEM...
Page 46: ...Section 7 ILLUSTRATIONS AND PARTS LIST 42 7 6 COOLER ASSEMBLY...
Page 48: ...Section 7 ILLUSTRATIONS AND PARTS LIST 44 7 7 DISCHARGE SYSTEM...
Page 50: ...Section 7 ILLUSTRATIONS AND PARTS LIST 46 7 7 DISCHARGE SYSTEM...
Page 52: ...Section 7 ILLUSTRATIONS AND PARTS LIST 48 7 8 INSTRUMENT PANEL AND PARTS...
Page 54: ...Section 7 ILLUSTRATIONS AND PARTS LIST 50 7 9 CONTROL SYSTEM...
Page 56: ...Section 7 ILLUSTRATIONS AND PARTS LIST 52 7 9 CONTROL SYSTEM...
Page 58: ...Section 7 ILLUSTRATIONS AND PARTS LIST 54 7 10 ELECTRIC CONTROL BOX...
Page 60: ...Section 7 ILLUSTRATIONS AND PARTS LIST 56 7 11 UNIT TUBING...
Page 62: ...Section 7 ILLUSTRATIONS AND PARTS LIST 58 7 11 UNIT TUBING...
Page 64: ...Section 7 ILLUSTRATIONS AND PARTS LIST 60 7 12 DECAL GROUP...
