What type and length of fastener do I use to install a Jamesbury Butterfly valve. How much do I torque the fasteners?
Although machine bolts are commonly used, Jamesbury recommends that studs and washers be used for installing Butterfly valves. Depending on the bolt length, mating flange thickness and gasket thickness, the tolerance variations can cause the bolt to “bottom out” before full compression of the gasket is achieved. Refer to bulletin T104-1 for additional information. Fastener torques are determined by the type of gasket used, if the fasteners are lubricated or not and the method of tightening, and are usually specified by the gasket manufacturer.
