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Swing Check Valves

Swing Check Valves
2Pages

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1. Hayward guarantees its products against defective material and workmanship only. Hayward assumes no responsibility for damage or injuries resulting from improper installation, misapplication, or abuse of any product. 2. Hayward assumes no responsibility for damage or injury resulting from chemical incompatibility between its products and the process fluids to which they are subjected. Compatibility charts provided in Hayward literature are based on ambient temperatures of 70F and are for reference only. Customer should always test to determine application suitability. 3. Consult Hayward literature to determine operating pressure and temperature limitations before installing any Hayward product. Note that the maximum recommended fluid velocity through any Hayward product is eight feet per second. Higher flow rates can result in possible damage due to the water hammer effect. Also note that maximum operating pressure is dependent upon material selection as well as operating temperature. 4. Hayward products are designed primarily for use with non-compressible liquids. They should NEVER be used or tested with compressible fluids such as compressed air or nitrogen. 5. Systems should always be depressurized and drained prior to installing or maintaining Hayward products. 6. Temperature effect on piping systems should always be considered when the systems are initially designed. Piping systems must be designed and supported to prevent excess mechanical loading on Hayward equipment due to system misalignment, weight, shock, vibration, and the effects of thermal expansion and contraction. 7. Because PVC and CPVC plastic products become brittle below 40F, Hayward recommends caution in their installation and use below this temperature. 8. Published operating torque requirements are based upon testing of new valves using clean water at 70F. Valve torque is affected by many factors including fluid chemistry, viscosity, flow rate, and temperature. These should be considered when sizing electric or pneumatic actuators. 9. Due to differential thermal expansion rates between metal and plastic, transmittal of pipe vibration, and pipe loading forces DIRECT INSTALLATION OF METAL PIPE INTO PLASTIC CONNECTIONS IS NOT RECOMMENDED. Wherever installation of plastic valves into metal piping systems is necessary, it is recommended that at least 10 pipe diameter in length of plastic pipe be installed upstream and downstream of the plastic valve to compensate for the factors mentioned above. > RECOMMENDED FLANGE BOLT TORQUE FLANGE BOLT TORQUE SIZE DIA. FT. LBS. NOTE: USE WELL LUBRICATED METAL BOLTS AND NUTS. USE SOFT RUBBER GASKETS. 3 5/8 20-25 4 5/8 20-25 6 3/4 30-40 8 3/4 30-40 >

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REPAIR: > IF THERE IS A SHEAR PIN AND COUNTER WEIGHT THE SHEAR PIN MUST BE REMOVED TO REMOVE THE CLAPPER. Remove the complete valve body from the piping system. If the valve seat is damaged due to solids or erosion the valve does not necessarily have to be replaced. A new seat seal surface can be obtained by reversing the clapper in the body. Remove the bolts, nuts and washers that hold the body together. Carefully remove all solids from the body halves. Remove the snap rings from both the pivot shafts. Carefully push the shafts out of the valve body. Check all O-rings for damage and...

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Swing Check Valves 2Pages

Catalog excerpts

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Swing Check Valves
2Pages