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Thermoplastic Valves Product Guide & Engineering Specifictions
Butterfly Check Valves
Page 813 Suitable for Oil-Free air handling to 25 psi, not for distribution of compressed air or gas Spears
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Manufacturing Company
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No. Component Qty. Material
1 Body 1 PVC/CPVC
2 Flapper 2 PVC/CPVC
3 Flex Seal Gasket 1 EPDM/FKM
4 Flapper Cover 2 PVC/CPVC
5 Flapper Screws 6 PVC/CPVC
6 Hinge Post Screws 3 Encapsulated SS
7 Post Strip 1 PVC/CPVC
8 Post Bolt 3
PVC/CPVC
(Steel Reinforced)
9 O-ring 2 EPDM/FKM
10 Hinge Post 1 PVC/CPVC
Dimensions
Size
Spigot (Plain End) Valve, Grooved
End Valve & Threaded Valve
Flanged Wafer
Pressure
Rating (psi)
A B ABAB
2 5-3/4 2-9/16 6-1/16 6 1-3/4 4 150
2-1/2 5-3/4 3-3/32 6-1/8 7 2-3/8 4-3/4 150
3 5-3/4 4-1/32 6-1/4 7-1/2 2-3/4 5-1/4 150
4 6-3/4 4-13/16 7-1/4 9 3-5/8 6-5/8 150
6 10-1/2 7-9/32 11-3/8 11 4-1/4 8-5/8 150
8 14 10-7/32 14-9/16 13-1/2 6 11 150
10 16 11-31/32 17-3/8 16 10 13-1/4 100
12 16 14-1/32 17-1/4 19 12 16 100
14 18 14-3/4 20 21 13 17-5/8 100
16 19-3/4 16-17/32 21-1/4 23-1/2 13-1/2 20-1/8 70
18 26-1/2 19-31/32 27 25 15-1/2 21-1/2 50
20 28-7/8 21-25/32 40-7/8 27-1/2 17 23-3/4 50
24 29-7/8 25-21/32 43-7/8 32 19 24 50
A
B
A
B
A
B
A
B
A
B
General Installation Information
Butterfly Check Valve seating may be affected by normal system turbulence. Valves should be installed at least 5 pip
e
diameters away from any fitting. If used as a foot valve, do not place near bottom of a tank. Butterfly type check valves shoul
d
not be used in continuous cycling applications, such as with reciprocating pumps. This can result in premature failure of sealin
g
membrane. In horizontal installations, always orient the Hinge Post Bolts visible on the external body in a vertical (top an
d
b
ottom) position, perpendicular to flow. In vertical installations downstream from an elbow, flow velocities can be higher o
n
the outer radius of the elbow. To avoid uneven butterfly plate loading, the Hinge Post Bolts should align with crotch and oute
r
radius of elbow and NOT from side to side of the elbow.
Notes: Flanged valves are designed for mounting between two (2) ANSI Class 125/150 bolt pattern flanges using user supplied 1/8" full-faced gaskets, bolts, nuts and flat wash
-
ers. Male thread ends are standard NPT tapered. Grooved ends are for use with mechanical coupler designed for thermoplastic pipe.
As a general guideline, Opening & Closing Pressures will range from .2 to .5 psi for horizontal applications. Opening pressure tends to
decrease in larger size valves. Valves installed in vertical up-flow applications will require slightly higher pressures.
Replacement Parts