Technical Specifications

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Masoneilan* 39003 Series

High Performance Butterfly Valves

GE Oil & Gas

fact sheet

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 pressure-

assisted 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.

• Excellent flow characteristics – the offset (eccentric) disc design

provides an approximate equal percentage flow characteristic

through its full travel of 90° rotation yielding a Cv ratio of 100:1.

• Extra heavy shafts with keyed ends for actuator mounting –

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.

Summary of content (2 pages)

PAGE 1
GE Oil & Gas 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.
PAGE 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 Key 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.