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Thermoplastic Valves Product Guide & Engineering Specifictions
Butterfly Valve Dimensions & Operational Information
Made in the U.S.A. Suitable for Oil-Free air handling to 25 psi, not for distribution of compressed air or gas Page 792
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Spears
®
Butterfly Valves are designed for system connections either between two flanges, or with single-side (flange one-side
only) connection for dead-end service using lug style valves. Lug Insert Valves require attention to flow direction, True Lug
valves may be installed either direction. The valve handle (or gear operator) is reversible 180° for either left or right side
operation. Spears
®
Butterfly Valves are designed for installation with user supplied 1/8" full-faced gaskets, hex bolts, nuts
and flat washers.
Caution: Spears
®
Butterfly Valves are designed for use with flanges or flanged equipment having minimum waterway inside
diameter no less than that of Schedule 80 PVC pipe (ASTM D 1785). Use of smaller inside diameter flange connections may
result in obstruction and damage to the valve disc.
1: Minimum bolt lengths based on use of Spears
®
flanges, 1/8" full faced gaskets, standard S.A.E. hex bolts and Standard Plate Series flat washers.
2: Specified bolt lengths are maximum allowable for maintaining proper clearance in initial Single-Side installation with Lugs where anticipated 2nd Flange installation option is to be
retained without removal of valve.
3: Minimum bolt length through 2-flanges, 2-gaskets, 2-flat washers and 1-valve body.
Single-Side (flange one side) Installation Using Standard Valve with Lug Inserts (for
field installable Insert Sets or valves with factory installed Lug Inserts)
CAUTION: Flange must be installed on side of valve opposite
the hex nut recesses for Single-Side Installation as illustrated.
(Flange, bolts, nuts, washers and gaskets not included.
Lug inserts may be ordered separately.)
General Installation Information
PVC & CPVC Butterfly Valve Torque and Hardware Requirements
Valve
Size
(in.)
No.
of
Bolt
Holes
Bolt
Torque
(ft.- lb.)
Standard Valve Valve with Lug Inserts True Lug Valve
Bolt Lengths
1
(in.)
Bolt
Diameter
(in.)
Bolt
Threads
per inch
Flat
Washer
O.D. (in.)
Bolt Lenghts
1
(in.)
Bolt
Diameter
(in.)
Lug
Threads
per inch
Flat
Washer
O.D. (in.)
Bolt
Lengths
2
(in.)
Bolt
Diameter
(in.)
Lug
Threads
per inch
Flat
Washer
O.D. (in.)
Single
Side
Dual
Flange
3
Single
Side
2nd
Flange
2
1-1/2 4 12 3-1/4 4-1/4 1/2 13 1-3/8 1-3/4 1-1/2 1/2 13 1-3/8 1-1/2 7/16 14 1-1/4
2 4 25 3-3/4 4-3/4 5/8 11 1-3/4 2 1-3/4 5/8 11 1-3/4 1-1/2 1/2 13 1-3/8
2-1/2 4 25 4-1/4 5-1/4 5/8 11 1-3/4 2-1/4 2 5/8 11 1-3/4 1-3/4 1/2 13 1-3/8
3 4 25 4-1/4 5-1/2 5/8 11 1-3/4 2-1/4 2 5/8 11 1-3/4 2 1/2 13 1-3/8
4 8 25 4-1/2 5-3/4 5/8 11 1-3/4 2-1/2 2 5/8 11 1-3/4 2 1/2 13 1-3/8
6 8 40 5-1/4 6-3/4 3/4 10 2 3-1/4 2-1/4 3/4 10 2 2-1/4 5/8 11 1-3/4
8 8 40 5-3/4 7-1/4 3/4 10 2 3-3/4 2-1/4 3/4 10 2 2-1/4 5/8 11 1-3/4
10 12 64 6-1/2 8-1/4 7/8 9 2-1/4 4 3 7/8 9 2-1/4 2-3/4 3/4 10 2
12 12 95 6-3/4 8-1/2 7/8 9 2-1/4 4-1/4 3 7/8 9 2-1/4 2-3/4 3/4 10 2
Valve
Size
No. of
Bolt
Holes
Bolt
Diameter
(in.)
Bolt
Torque
(ft.- lb.)
Bolt Lengths
Valve Lay
Length
1-1/2 4 1/2 12
Bolt lengths will vary according to thickness of valve,
mating flanges, nuts and gaskets used.
The following formula may be use to calculate bolt length
for installation with mating flange each side.
1-9/16
245/825 1-7/8
2-1/2 4 5/8 25 2-1/16
345/825 2-1/8
485/825 2-5/16
683/440 3
883/440 2-3/4
10 12 7/8 64 3-1/4
12 12 7/8 95 3-1/2
14 12 1 110 6-1/4
16 16 1 110 6-3/4
18 16 1-1/8 110 7-1/8
20 20 1-1/8 110 7-3/4
24 20 1-1/4 110 8-1/2
Polypropylene Butterfly Valve Torque and Hardware Requirements
L = V + 2 ( F + G + W ) + N
Where: L = Minimum Bolt Length
V = Valve Lay Length
F = Flange Thickness
G = Gasket Thickness
W = Washer Thickness
N = Nut Thickness