Technical Specifications

39003 Series High Performance Butterfly Valves (HPBV) | 3
Table of Contents
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 pres-
sure-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 off-
set (the seal ring centerline is offset from the shaft centerline – see
Figure 1) and shaft offset (the shaft centerline is offset from the
valve centerline – see Figure 1) 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) con-
tact 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 listed below:
• 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 elim-
inates 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 back-
lash.
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.
Trade names noted throughout are for reference only. GE reserves
the right to supply trade named material or its equivalent.
Foreward
Foreword ....................................................................................................................3
Features .....................................................................................................................4
Numbering System ...............................................................................................5
General Data ............................................................................................................7
Pressure/Temperature Ratings ........................................................................ 8
Body Assembly Data ......................................................................................... 10
Actuator Data ....................................................................................................... 11
Rated Flow Coefficients (C
V
) and Pressure Recovery Coefficients (F
L
) .......12
Standard Valve Components ......................................................................... 14
Allowable Pressure Drops ................................................................................ 16
Weights ................................................................................................................... 17
Dimensions ............................................................................................................ 19
GE Sales Offices ................................................................................. Back Cover