• Overview
  • Specifications
  • Related Products

Overview

Our DYNATORQUE BG multiturn bevel gear operators provide smooth, even torque transmission for thrust and nonthrust applications such as gate, knife gate, pinch, sluice gate, or globe valves. This line of operators can also be used in almost any multiturn, right-angle application requiring mechanical advantage.

The gearbox housing is ductile iron. Bevel and pinion gears are investment-cast ductile iron bevel for smooth, continuous transmission of torque. 

Optional stem nuts are available for direct threaded interfacing and lug drivers for existing valve yoke nuts.

  • 20 different frame and spur combinations provide output thrust of 22,000 to 150,000 lbf [98,000 to 667,000 N] and torque output up to 3,500 ft.lbf [4,745 N.m]
  • BG3 and BG6 have standard ISO Specification 5211 mounting patterns (optional patterns on request)
  • Gearbox housing of ductile iron
  • Investment-cast ductile iron bevel and pinion gears for smooth, continuous transmission of torque
  • Optional bronze stem nuts for direct threaded interfacing and lug drivers for existing valve yoke nuts
  • Motor mounts available for electric motor operation

Specifications

Model  Unit
Weight,
lbm
Maximum
Output
Torque,
ft.lbf
Maximum
Thrust,
lbf
Gear
Ratio
Mechanical
Advantage
BG3  26 625 22,000  3:1  2.55 
BG34 60  625 22,000 12:1 8.16
BG4 83  1600 30,000
4:1 3.40
BG42 83 1,600
30,000
8:1 6.12
BG44
115 1,600
30,000
16:1 10.88
BG46
119 1,600  30,000
24:1 16.32
BG424
117 1,600
30,000
32:1 19.58
BG426
117 1,600
30,000 48:1 29.38
BG4GT
83 2,300  80,000
4:1 3.40
BG42GT
83 2,300 
80,000
8:1 6.12
BG44GT
115  2,300 
80,000
16:1 10.88
BG46GT
119 2,300 
80,000
24:1 16.32
BG424GT
117 2,300 
80,000
32:1 19.58
BG426GT
117  2,300 
80,000 48:1 29.38
BG6 210 3,500 150,000 
6:1 5.10
BG62
212  3,500
150,000 
12:1 9.18
BG64
242 3,500
150,000 
24:1 16.32
BG66
242  3,500
150,000 
36:1 24.48
BG624
245  3,500
150,000 
48:1 29.38
BG626
245  3,500
150,000  72:1 44.11

Model  Mounting
Bolt Quantity
and Size, in
Standard
Mounting
Bolt Circle
Optional Mounting 
Bolt Circles (Min.),
in
Optional Mounting 
Bolt Circles (Max.),
in
BG3
Four 5/8–11
5.12 3/8–16 (4.016)  5/8–11 (6.000)
BG34
Four 5/8–11
5.12  3/8–16 (4.016)
5/8–11 (6.000)
BG4
Eight 1/2–13
7.625
3/8–16 (6.875)
5/8–11 (10.180)
BG42
Eight 1/2–13
7.625
3/8–16 (6.875)
5/8–11 (10.180)
BG44
Eight 1/2–13
7.625
3/8–16 (6.875)
5/8–11 (10.180)
BG46
Eight 1/2–13
7.625
3/8–16 (6.875)
5/8–11 (10.180)
BG424
Eight 1/2–13
7.625
3/8–16 (6.875)
5/8–11 (10.180)
BG426
Eight 1/2–13
7.625
3/8–16 (6.875)
5/8–11 (10.180)
BG4GT
Eight 1/2–13
7.625
3/8–16 (6.875)
5/8–11 (10.180)
BG42GT
Eight 1/2–13
7.625
3/8–16 (6.875)
5/8–11 (10.180)
BG44GT
Eight 1/2–13
7.625
3/8–16 (6.875)
5/8–11 (10.180)
BG46GT
Eight 1/2–13
7.625
3/8–16 (6.875)
5/8–11 (10.180)
BG424GT
Eight 1/2–13
7.625
3/8–16 (6.875)
5/8–11 (10.180)
BG426GT
Eight 1/2-13
7.625
3/8–16 (6.875)
5/8–11 (10.180)
BG6
Eight 3/4-10
11.732
5/8–11 (10.00)
1 1/8–7 (14.02)
BG62
Eight 3/4-10
11.732
5/8–11 (10.00)
1 1/8–7 (14.02)
BG64
Eight 3/4-10
11.732
5/8–11 (10.00)
1 1/8–7(14.02)
BG66
Eight 3/4-10
11.732
5/8–11 (10.00)
1 1/8–7 (14.02)
BG624
Eight 3/4-10
11.732
5/8–11(10.00)
1 1/8–7 (14.02)
BG626
 Eight 3/4-10
11.732
5/8–11 (10.00)
1 1/8–7 (14.02)

Bevel gear drivers

Manganese bronze stem nuts (style C): These drivers are normally associated with rising stem gate valves. They are cast manganese bronze (ASTM 86300), are supplied blank by Cameron, and include mounting hardware to the appropriate bevel gear output gear.

Model  Part Number Maximum Bore, in
Minimum Bore, in
BG3 Series 24-008
1.750
0.500
BG4 Series
24-006
2.500
0.750
BG6 Series
24-003
4.375
2.000

Lug drivers (Style D): These drivers are provided as a means of rotating custom yoke nut drivers. The lugs interface with the driver, which has been adapted to the valves yoke nut. They are cast in ductile iron and are provided with mounting hardware to the appropriate bevel output gear.

Model  Part Number
BG3 Series
24-009
BG4 Series
24-007
BG6 Series
24-002

The formulas listed below will assist you in determining alternate handwheel sizes and rim pull requirements.

  • To find handwheel diameter for a given output torque at a given rim effort, multiply the output torque by 12 to get the torque in in.lbf. Then divide this result by the mechanical advantage and multiply the result by 2. Divide this result by the handwheel rim effort. 
  • To find rim effort for a given output with a given handwheel diameter, multiply the output torque by 12 to get the torque in in.lbf. Then divide this result by the mechanical advantage and multiply the result by 2. Divide this result by the handwheel diameter. 

Handwheels are sold as a separate item.