Masoneilan High Performance Butterfly Control Valves0 pages

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. 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