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Masoneilan High Performance Butterfly Control Valves

Masoneilan High Performance Butterfly Control Valves
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Masoneilan High Performance Butterfly Control Valves - 1

Masoneilan* 39003 Series High Performance Butterfly Valves GE’s Masoneilan 39003 Series High Performance Butterfly Valve (HPBV) is a heavy duty automatic throttling control valve that incorporates the two basic features of the HPBV types. These features differentiate the the Masoneilan* 39003 Series HPBV from the conventional swing-through butterfly valve in regards to sealing method and operational characteristics. Specifically, the two basic features are: (1) A PTFE, RTFE, or metal seal ring instead of a liner, and (2) The employment of double offset (eccentric operation). Each of these features contributes to the improved performance of HPBV’s compared to conventional butterfly valves. The use of a seal ring (PTFE, RTFE, or metal) eliminates the inherent problems of high sealing forces, due to interference fit, and the resultant high wear rates due to scraping and scuffing of liners. Also, due to the design of the seal itself, which is a dynamic pressureassisted member, ANSI Class VI shutoff rates are available throughout the full range of ANSI Class 150, 300 and 600 ratings (soft-sealed constructions only). The double offset (eccentric) operating principles of both seal offset (the seal ring centerline is offset from the shaft centerline) and shaft offset (the shaft centerline is offset from the valve centerline) allows the disc to get off the seal quickly due to the camming rotation with respect to the valve/seal centerlines. This results in minimal sliding (friction producing) contact between the disc and the seal ring with complete separation after only a few degrees of rotation. The overall characteristics of the Masoneilan* 39003 Series Valve are: • Long seal life – Offset (eccentric) operation gets the disc off the seal quickly, minimizing sliding contact and friction, resulting in reduced seal wear and lower breakaway and seating torque requirements. • Fast/dynamic operation – Offset (eccentric) operation eliminates disc-to-seal friction throughout the operating range resulting in fast response to input signals. Also, the disc tends to move in the direction of flow, assisting the valve and actuator to maximize the allowable operating pressures. • xcellent flow characteristics – the offset (eccentric) disc design E provides an approximate equal percentage flow characteristic through its full travel of 90° rotation yielding a Cv ratio of 100:1. • xtra heavy shafts with keyed ends for actuator mounting – E precise and accurate positioning without lost motion or backlash. PTFE-lined low-friction bearing – Reduces operating torque and promotes fast response to valve and actuator action. The triple bearing support of the shaft prevents deflection of the shaft due to side-loading. Field replaceable components – Unlike most competitive valves, shaft and disc need not be purchased as a set. The Masoneilan* 39003 Series Valve uses tapered pins to attach the shaft and disc positively, yet provide component interchangeability. fact sheet

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Masoneilan High Performance Butterfly Control Valves - 2

fact sheet Features GE’s Masoneilan 39003 Series HPBV includes unique valve seal designs for metal, soft seal, and fire-safe configurations. Standard Valve Components Shaft Metal Seal Design The metal seal design incorporates an Inconel seal for higher tensile strength, a 300 series stainless steel back-up ring in the seal cavity for axial seal support, and a disc that is case hardened by nitriding. The Inconel seal, by its dynamic and flexible design, applies enough force per linear inch against the disc edge (Rockwell Hardness of C66 to C70) to obtain an optimum sealing characteristic...

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