The BV-Butterfly Valve has a flanged construction which eliminates the need for pipe unions. Air flow in low pressure lines (up to 3 psig) is easily and effectively controlled by the butterfly valve. This may be done manually or automatically by using suitable control equipment. These valves are designed for free flow with minimum air pressure drop. As they are not intended for tight shut-off, slight leakage (less than 2%) may occur in the closed position. In most applications it is necessary to maintain the rate of firing above the backfire point of the Burners. Manual butterfly valves are furnished with an adjustable minimum stop. After once setting this stop, the operator can turn the air up and down without danger of inadvertently going too low. Models are available for electric or pneumatic actuator operation.
FEATURES
For most fuel gases and air
400° maximum temerature
Double bearing shaft - positive alignment
Viton "O" Ring sealed shaft
Thumb screw lock - holds disc position
Adjustable limit stop - both high and low flow
Disc position indicator on name plate
Cast iron body, steel disc
Large, easy-grip dial handle
1/8'' NPT tap for pressure
Simple field conversion from manual to automatic operations
CAPACITY TABLE
Model No.
Pipe Size NPT (in.)
Capacity Air CFH
1/2" W.C. Drop
1" W.C. Drop
2" W.C. Drop
6 BV
3/4''
600
900
1,300
8 BV
1''
750
1,100
1,500
10 BV
1-1/4''
1,800
2,500
3,600
12 BV
1-1/2''
2,000
2,800
3,900
16 BV
2''
3,700
5,200
7,300
20 BV
2-1/2''
6,100
8,600
12,200
24 BV
3''
9,300
13,100
18,500
32 BV
4''
18,000
25,000
36,000
48 BV
6''
40,000
55,000
80,000