Technical Specifications

4 | GE Oil & Gas
Features
GE’s Masoneilan 39003 Series HPBV includes unique valve seal designs for
metal, soft seal, and fire-safe configurations.
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 while controlling the loads between the
metal surfaces.
The metal seal design can be utilized for temperatures up to 900˚F, in
compliance with ANSI B16.34 pressure/temperature specifications. Leakage
is rated at Class IV per ANSI FCI 70-2.
Soft Seal Design
The soft seal design provides a bi-directional bubble tight shutoff (zero
leakage) through the use of a patented seal. This unique seal design creates a
self-energized seal in vacuum-to-low pressure applications.
Under higher pressure conditions, the seal is also designed to confine and
direct movement of the soft seal against the disc edge, up to the full ANSI
Class 150, 300 and 600 Cold Working Pressures.
The soft seal is designed for high services with minimal wear and low torque.
Seal replacement is a simple procedure requiring no special tools.
Fire-Safe Seal Design
The fire-safe seal design incorporates two patented seals which function
together to seal off pipeline flow. In normal operation, the soft seal provides a
bi-directional “bubble tight” shutoff (zero leakage); the metal seal provides bi-
directional shutoff in the event of a fire, in conformance to industry fire-safe
requirements.
With little or no pressure, the fire-safe seal creates a self-energized seal
against the disc. Higher line pressures act on the geometry of both seals
to dynamically load them against the disc, creating higher sealing forces in
either direction.
The metal seal is made of Inconel material which is shaped by a proprietary
hydroforming process into its unique, patented design. Stainless steel outer
bearings are included for post-fire disc and shaft alignment. Fireproof
packing is used to prevent external shaft leakage.
Disc/Nitrided
300 Series Stainless
Steel Backup Ring
Inconel Seal
Disc
Seal
“O” Ring
Disc
Metal Seal
Soft Seal
“O” Ring
Metal Seal Gasket