FLOWSEAL
3201 Walnut Avenue, Long Beach, CA 90807
562/426-2531
FAX 562/490-9546
3
INTRODUCTION
Valve Description
The Flowseal High Performance Butterfly Valve (HPBV) is
designed for ANSI Class 150, 300 and 600 piping systems
and is available in both Wafer and Lug style body designs.
The standard size range available is as follows:
ANSI Class 150 ............................... 2" through 48"
ANSI Class 300 ............................... 2" through 30"
ANSI Class 600 ............................... 2" through 16"
Valve Design Features
• Flowseal's HPBV's feature a double offset (or double
eccentric) shaft design to minimize seat abrasion and
lower torque. This double offset design allows the disc to
lift off and “cam” away from the seat as it rotates open.
• The Flowseal valve always rotates clockwise to close
(when viewed from above) and counterclockwise to open.
• The valve body has an Overtravel Stop which prevents the
disc from over rotating into the wrong quadrant. This stop
is not to be used as a disc position stop; if the disc
contacts the Overtravel Stop, this means it has rotated
beyond the seat
• The Flowseal valve is bi-directional, but the preferred
installation position is with the seat in the upstream
position (SUS). Note the arrow on the metal tag attached
to the valve body for preferred direction of flow.
Flange Compatibility
The Flowseal valve is designed to fit between flanges as
follows:
ANSI Class 150 ............................... 2" through 24"
MSS SP-44 Class 150 ..................... 30" through 48"
ANSI Class 300 ............................... 2" through 24"
MSS SP-44 Class 300 ..................... 30"
ANSI Class 600 ............................... 2" through 16"
Gasket Compatibility
The Flowseal valve is designed to accomodate the use of
standard fiber gaskets (such as non-asbestos, flexible graph-
ite, asbestos or equivalent gasket materials) of
1
⁄16" or less,
meeting the dimensional requirements of ANSI/AMSE
B16.21. Thick elastomeric gaskets are not recommended.
Metallic wound (Flexitallic) gaskets may be used with the
wedge ring retainer configuration.
SERIAL NO.
FIGURE NO.
SIZE/CLASS
STEM/PINS
SEAT
BODY
DISC
BRGS
PSI
PSI
PSI
TAG NO.
BODY COLD WORKING PRESSURE
MAX. SHUT–OFF PRESS. @ 100 °F
°F
FLOWSEAL
PREFERRED FLOW DIRECTION
@
Operating Pressures
All Flowseal HPBV's may be applied to full ANSI ratings.
However, different materials of construction may affect the
rated pressure. The shut-off pressure rating is determined
by the valve shaft and disc materials as well as the seat
design, and is reflected on the metal identification tag
attached to the valve.
Product Identification
SECTION 1
Every Flowseal valve has a metal identification tag attached
to the valve body. Information on this tag includes the valve
Figure Number, Size and Pressure Class, Materials of
Construction, and Operating Pressures and Temperatures.
The metal tag also includes a Serial Number. This number,
unique for each valve, is recorded by the Flowseal Quality
Control Department along with the valve hydrostatic test
results and material certification data for individual traceabil-
ity and verification of every valve produced.
Pipe Schedule Compatibility
The Flowseal valve is designed to allow the disc edge to
rotate into the open position without interference with pipe of
a schedule equal to or lighter to those shown below:
Size ANSI 150 ANSI 300 ANSI 600
2" – 12" SCH 80 SCH 80 SCH 120
14" – 24" SCH 40 SCH 80 SCH 120
30" SCH 30 SCH 80
36" – 42" STD WT
48" XS
