Compac CNG User Manual

Solenoid Valve Seal Replacement
Servicing
Compac Industries Ltd.
Page 48
www.compacngv.com
Solenoid Valve Seal Replacement
These instructions refer to the current Compac S2-350 solenoid valve. The
solenoids are available in several types: Standard, high oil and low
temperature. Always quote the dispenser serial number when ordering parts
and check the model number on the valve body before installation.
For applications where the gas has a high oil content, a special
piston with an O ring seal is available. If you are having problems, discuss
this option with your service agent. If the special piston is used for low oil
content gas, no harm will occur but the service life of the seal may be
shortened.
Before you start, make sure you have:
 A seal kit - Part number FC-SK-0001
 1 x Teflon valve seal
 1 x solenoid top O-ring seal
 1 x gas return line O-ring seal
 O-ring lubricant
 Solenoid piston - Part number FC-VLV-PSTN-0001 (optional standard)
 Solenoid piston – Part number FC-VLV-PSTN-S2 (optional high oil)
 Solenoid top service kit standard. Part number FC-SVK-0003 (replace
valve top if leak detected through stem)
 Solenoid top service kit - low temperature option (-40 degrees C). Part
number FC-SVK-0004 (replace valve top if leak detected through stem)
Never remove or service the stem. If it is leaking, it must be
replaced using the appropriate top service kit.
Cleanliness is essential. When working on the open solenoid
assembly, cover the opening with a cloth to prevent dust and dirt from
entering.
O-rings that are subjected to natural gas at high pressure swell
when exposed to air. Once swollen, they cannot be reused and must be
replaced.
The Nitrile O-rings have a life span of over 10 years from cure
date but improper handling of these O-rings before use can shorten their
useful life. O-rings will deteriorate if exposed to ozone or ultraviolet light so
keep in original packaging and away from UV light. If in unsure about their
condition, do not use old O-rings and order new ones.
It is not necessary to remove the solenoid body from the
dispenser to service the solenoid seals.
Remove the Old Solenoid Valve
Seals
1. De-gas the dispenser (see page 40).
2. Switch off the power supply to the dispenser.
Never remove any electrical components without first
switching off the power to the dispenser. Failure to turn off the power
could result in an electric shock.
3. Unscrew the solenoid coil retaining nut and move the coil out of the way.
4. Remove the six cap screws from the solenoid top.
Do not remove the angled grub screw from the solenoid
top. This is epoxied in place during manufacture and should never be
removed.
5. Remove the solenoid top and remove the old top O-ring seal and gas
return O-ring.

Compac CNG Specifications

General

Brand	Compac
Model	CNG
Category	Dispenser
Language	English