INSTALLATION, OPERATION and MAINTENANCE Figures 251-D & 251-U Single Increasing Figures 252-D & 252-U Double-Increasing Air-Cushioned Lever & Weight Swing Check INTRODUCTION This manual will provide the information to properly Consult the drawings of record to verify the install, operate and maintain the valve to ensure a configuration supplied and installed.
VALVE CONSTRUCTION TROUBLESHOOTING The standard Figure 251 and 252 Swing Check • Shaft packing leakage Valves have a cast iron body, bronze or stainless Tighten packing gland nuts equally just steel (indicated by Figure Number suffixed with “S”) enough to stop leakage, no more than ½ turn body seat, stainless steel hinge shaft and cast iron at a time.
WARRANTY: disassembly sequence with consideration of the following: The VAG USA, LLC Warranty can be found at: https://www.vag-group.com/us-en/terms-and- 1a. Clean and polish all machined bearing and conditions-for-vag-usa-llc sealing surfaces. Apply a light coat of lubricant to assist in the assembly.
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Part No. Part Name Std. Material Part No. Part Name Std. Material Body Cast Iron Disc Arm Key Stainless Steel Body Seat Bronze or SS Cushion Chamber Cast Iron** Seat O-Ring Buna-N Cushion Chamber Liner Bronze** Seat Pins Stainless Steel Plunger Brass/Bronze Disc with Center Pin...