BUTTERFLY VALVES
Cashco, Inc. now offers both rack and pinion (400 Series) and scotch
yoke (200 Series) actuators as standard options for the Ranger
QCT eccentric plug valve and Premier lined and unlined butterfly valves. This is ideal when small envelope size is required, and quick response times are necessary. These can be mounted with the Moore 760 Valve Pac Positioners, the Siemens PS2 Smart positioners, or solenoid switches.
The Premier EZO are elastomer lined concentric butterfly valves with a pneumatic spring-diaphragm actuator. The unique design feature of the Premier EZO is the geometrically formed elastomer liner that reduces seating and unseating torque levels, allowing E Z-er Opening, reducing annoying “popoff” at opening. An alternate design – Premier Unlined – is a seatless design that allows the disc 360 degree rotation, that has no elastomer liner and can be applied in higher temperature services where
shutoff is not critical. Both designs are for low-to-moderate pressure drop throttling applications. Installation is between piping flanges as
flangeless wafer. (NOTE: Premier EZO must be installed between RF weldneck flanges.)
A butterfly valve is a valve with a circular body and a rotary motion disk closure member which is pivotally supported by its stem. Butterfly valves come in various styles including eccentric and high-performance valves. Butterfly valves are high recovery valves and thus tend to induce CAVITATION in liquid services at much lower pressure drops and fluid temperatures than the globe style valve. Due to instability problems with the older design butterfly valves, many people will limit the travel of the valve at 60 degrees of rotation on throttling services. This can also help keep the valve out of CAVITATION problems.
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