Nor-Cal N-Series Op Lit - Manual (Page 11)

11 Call toll free 800-824-4166 or 530-842-4457 • FAX 530-842-9130
N-Series Isolation Poppet Valves
6.6 Valve Makes Noise
Under normal circumstances, the N-Series valve will make a very faint sound when actuated. This sound stems from the spring compressing and coming in inten-
tional contact with the guides inside the pneumatic cylinder housing. If the valve starts making loud scraping or vibrational noises, then a more serious problem
has developed. Please contact Nor-Cal technical support at 1-800-824-4166.
6.7 Air Supply Solenoid Valve Is Leaking or Makes Noise
The air solenoid valve is controlled by a small electromagnetic solenoid coil, which typically lasts for millions of cycles. When operating normally, this part will
not make any sounds other than a light clicking when opened or closed. If compressed air starts to leak through the valve, or if it makes a buzzing sound, it is
possible that the valve is about to fail and replacement is necessary. A leading cause of premature failure is improper voltage. Check the power supplied to the
solenoid valve and make sure it meets the specifications.
7.0 Spare Parts & Accessories
This section contains ordering information as well as service and installation instructions for O-ring seal kits, replacement bellows and actuator assemblies, in
addition to solenoid valve and position indicator upgrade or replacement options.
CAUTION: FIELD SERVICE: Before attempting to diagnose or service a valve, please make sure that you have familiarized yourself with the
safe operation and maintenance of the valve (See Section 7). Compressed air and strong spring forces present potential hazards.
Make sure the valve is in a “safe state” before servicing by disconnecting the air supply line and/or the solenoid valve power
supply.
CAUTION: FIELD SERVICE: While performing work on the N-Series valve, be certain to use only proper tools and any special fixtures or
assembly aids recommended or supplied by Nor-Cal Products.
7.1 O-Ring Seal Kits
The N-Series valve contains two serviceable O-rings which include the main poppet seal and the bonnet seal (see Figure 4.2.1). N-Series valves sized from .75” to
2” use the same set of seals. The standard O-ring compound is Viton. Other compounds are available. [Aflas
® , Buna-N ® , Chemraz ® , Dupra ® , Kalrez ® , Perlast ® ,
etc…].
NOTE: ORDERING REPLACEMENT SEALS: Please make sure to have the part number or serial number of the valve available when ordering seal
replacements in the event you are not sure which seal compounds were originally installed.
Common replacement seal kits include:
NA-075-95: Viton ® poppet and bonnet replacement O-rings
NA-075-95-K79: Kalrez ® 4079 poppet and bonnet replacement O-rings
NA-075-95-C13 : Chemraz ® 513 poppet and bonnet replacement O-rings
NOTE: Other seal materials are available. Call for details.
To replace the O-ring seals, please see the following instructions :