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Section 6
MAINTENANCE
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
Ref er t o F igur e
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.
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.
28
6 --
11. F or t her m al v alv e ( P / N
NOTE
Figure 6-11 Thermal Valve (P/N 250001-456)
*
* Element Replacement Kit P/N 250001-349
** Quad Ring Seal Replacement Kit P/N 046425
*** Gasket Replacement Kit P/N 049812
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
Ref er t o F igur e
6 --
12. 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
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