FLOWSEAL
3201 Walnut Avenue, Long Beach, CA 90807
562/426-2531
FAX 562/490-9546
INTRODUCTION
4
Seat Alternatives
Flowseal HPBV's have three seat alternatives, all of which
are bi-directional.
Soft Seats provide tight shut-off to zero leakage specifica-
tions. Standard Soft Seat material includes virgin TFE or
reinforced TFE (RTFE).
Soft Seat Profile
Fire-Flow™ Seats are designed for critical piping applica-
tions in installations such as Refinery and Petrochemical
Plants. These seats are a combination of both metal and soft
seats with the metal seat being designed to function during
and after a fire. Valves of this type are referred to as “Fire-
Safe” and are tested to meet API 607 “Fire-Safe” specifica-
tions and operation criteria.
Fire-Flow™ Seat Profile
Metal Seats are well suited for higher temperature applica-
tions and provide shut-off to ANSI B16.104 Class IV.
Disc
Body
Seat
Retainer
Disc
Body
Seat
Retainer
Metal Seat Profile
Disc
Body
Seat
Retainer
Offset Disc Design
All Flowseal HPBV's have both off-set discs and eccentric
shafts. The off-set is applicable to the disc edge seating
surface relative to the shaft center line. By off-setting the
seating surface from the rotational center line, a contact with
the seat is possible throughout the 360° circumference. The
shaft is eccentric in the body by 0.060 inches and this
enhances seat life by imparting a camming action to the disc
as it rotates both in and out of the seat. Seat wear points are
eliminated at the top and bottom of the disc and operating
torque is reduced.
