• Overview
  • Specifications
  • Related Products

Overview

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

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 (see below).

  • 20 different frame and spur combinations provide output thrust of 22,000 to 150,000 lb (98 to 667 kN) and torque output up to 3500 ft-lb (4745 N·m)
  • BG3 and BG6 have standard ISO 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
lb
Maximum
Output
Torque
lb-ft
Maximum
Thrust
lb
Gear
Ratio
Mechanical
Advantage
BG3  26 625 22000 3:1  2.55 
BG34 60  625 22000 12:1 8.16
BG4 83  1600 30000
4:1 3.4
BG42 83 1600
30000
8:1 6.12
BG44
115 1600
30000
16:1 10.88
BG46
119 1600  30000
24:1 16.32
BG424
117 1600
30000
32:1 19.58
BG426
117 1600
30000 48:1 29.38
BG4GT
83 2300  80000
4:1 3.4
BG42GT
83 2300 
80000
8:1 6.12
BG44GT
115  2300 
80000
16:1 10.88
BG46GT
119 2300 
80000
24:1 16.32
BG424GT
117 2300 
80000
32:1 19.58
BG426GT
117  2300 
80000 48:1 29.38
BG6 210 3500 150000 
6:1 5.1
BG62
212  3500
150000 
12:1 9.18
BG64
242 3500
150000 
24:1 16.32
BG66
242  3500
150000 
36:1 24.48
BG624
245  3500
150000 
48:1 29.38
BG626
245  3500
150000  72:1 44.11

Model  Mounting
Bolt (Size
and Quantity)
Standard
Mounting
Bolt Circle
Optional Mounting 
Bolt Circles
(min)
Optional Mounting 
Bolt Circles
(max) 
BG3
(4)5/8-11
5.12 3/8-16(4.016)  5/8-11(6.000)
BG34
(4)5/8-11
5.12  3/8-16(4.016)
5/8-11(6.000)
BG4
(8)1/2-13
7.625
3/8-16(6.875)
5/8-11(10.180)
BG42
(8)1/2-13
7.625
3/8-16(6.875)
5/8-11(10.180)
BG44
(8)1/2-13
7.625
3/8-16(6.875)
5/8-11(10.180)
BG46
(8)1/2-13
7.625
3/8-16(6.875)
5/8-11(10.180)
BG424
(8)1/2-13
7.625
3/8-16(6.875)
5/8-11(10.180)
BG426
(8)1/2-13
7.625
3/8-16(6.875)
5/8-11(10.180)
BG4GT
(8)1/2-13
7.625
3/8-16(6.875)
5/8-11(10.180)
BG42GT
(8)1/2-13
7.625
3/8-16(6.875)
5/8-11(10.180)
BG44GT
(8)1/2-13
7.625
3/8-16(6.875)
5/8-11(10.180)
BG46GT
(8)1/2-13
7.625
3/8-16(6.875)
5/8-11(10.180)
BG424GT
(8)1/2-13
7.625
3/8-16(6.875)
5/8-11(10.180)
BG426GT
(8)1/2-13
7.625
3/8-16(6.875)
5/8-11(10.180)
BG6
(8)3/4-10
11.732
5/8-11(10.00)
1 1/8-7(14.02)
BG62
(8)3/4-10
11.732
5/8-11(10.00)
1 1/8-7(14.02)
BG64
(8)3/4-10
11.732
5/8-11(10.00)
1 1/8-7(14.02)
BG66
(8)3/4-10
11.732
5/8-11(10.00)
1 1/8-7(14.02)
BG624
(8)3/4-10
11.732
5/8-11(10.00)
1 1/8-7(14.02)
BG626
 (8)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) and are supplied blank by Cameron and include mounting hardware to the appropriate bevel gear output gear.

Model  Part Number Maximum Bore Minimum Bore
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-lb. 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-lb. 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.