By American Water Works Association.; American National Standards Institute
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Additional resources for AWWA standard for rubber-seated butterfly valves
Piping considerations should include allowable flange loadings, thermal expansion and contraction, and differential settlement. 3 When valves have adjustable seating, install the seat-adjustment side of the valve for access and adjustment in service. 4 Foreign material in a butterfly valve can damage the rubber seat when valves are operated. Be sure valve interiors and adjacent piping are cleaned of foreign material prior to mating up valve-to-pipe-joint connection. 5 Prepare pipe ends and install valves in accordance with the pipe manufacturer’s instructions for the joint used.
Actuator components between the input and these stops shall be designed to withstand, without damage, a rim pull of 200 lb (890 N) for handwheel or chainwheel and an input torque of 300 ft-lb (406 N·m) for wrench nuts. 3 Actuators for buried service valves shall be not less than 90 percent grease packed and totally sealed using gaskets, O-rings, or similar means. The valve shaft shall be fully enclosed with a housing, including where it connects to the actuator or bonnet extension. 4 The manufacturer shall select a representative actuator within each of the torque ranges for proof-of-design testing purposes.
Lift these valves with eye bolts or rods through the flange holes or chain hooks at ends of the valve parts. 3: STORAGE If it is not practical to store the valve indoors, protect the valve and actuators from weather and the accumulation of dirt, rocks, and debris. When valves fitted with power actuators and controls are stored, energize electric actuators or otherwise protect electrical-control equipment to prevent corrosion of electrical contacts caused by condensation resulting from temperature variation.