Locking Devices
For select Dynatorque valve accessories
Practical, field-mountable solution to help secure these valve accessories against unintended handwheel movement.
Dynatorque BG multiturn bevel gears
Reliable torque and thrust support for multiturn valve operation
Overview
Improve valve performance
Dynatorque™ BG multiturn bevel gears make high-load valves easier to operate, delivering smoother and more controlled torque transmission and supporting dependable operation in demanding service conditions. With spur-assisted gear combinations, robust ductile iron construction, and application-matched sizing, they help reduce operating effort while giving operators greater confidence through the full valve operating cycle.
Flexible mounting options and configurable accessories also help simplify integration with new or replacement valve packages, supporting faster configuration and more consistent field performance. By combining mechanical advantage, durable materials, and adaptable interfaces, DynaTorque BG gears help you improve uptime and keep critical valves operating when performance matters most.
Applications
- Rising stem gate valves requiring controlled multiturn operation and reliable thrust support
- Knife gate, pinch, sluice gate, and globe valves used in industrial flow control applications
- Right-angle handwheel or chainwheel installations where operator access, orientation, or space constraints require redirected input motion
- Manual valve packages requiring standard or customized mounting interfaces
- Electric motor operation where optional motor mounting support is required
Cutaway views of a Dynatorque BG multiturn bevel gear.
Benefits
- Smooth valve operation: Bevel and pinion gear design supports continuous, even torque transmission through the full operating cycle
- Application flexibility: Multiple frame and spur combinations help match gear ratio, mechanical advantage, torque, and thrust to valve requirements
- Durable construction: Ductile iron housings and investment-cast ductile iron gears support dependable performance and long service life in demanding conditions
- Configurable integration: Optional bronze stem nuts, lug drivers, miter boxes, stem protectors, input position indicators, and motor flanges help simplify integration with valve topworks
- Customer-ready mounting: Standard ISO 5211 and optional mounting patterns provide flexibility for new valve packages and replacement applications
Features
- Three base body sizes: BG3, BG4, and BG6
- 20 frame and spur combinations for expanded ratio, torque, and thrust coverage
- Output thrust from 22,000 to 150,000 lbf [98 to 667 kN]
- Torque output capability up to 3,500 lbf.ft [4,745 N.m]
Tech Specs
| Model | Unit Weight, lbm | Max. Output Torque, lbf.ft | Max. Thrust, lbf | Gear Ratio | Mech. Adv. | Standard Mounting Pattern (Quantity) and Size, in | Standard Mounting Pattern (Bolt Circle Diameter), in |
|---|---|---|---|---|---|---|---|
| Model BG3 | Unit Weight, lbm 26 | Max. Output Torque, lbf.ft 625 | Max. Thrust, lbf 22,000 | Gear Ratio 3:1 | Mech. Adv. 2.55 | Standard Mounting Pattern (Quantity) and Size, in (4) 5/8–11 |
Standard Mounting Pattern (Bolt Circle Diameter), in 5.512 |
| Model BG34 | Unit Weight, lbm 60 | Max. Output Torque, lbf.ft 625 | Max. Thrust, lbf 22,000 | Gear Ratio 12:1 | Mech. Adv. 8.16 | Standard Mounting Pattern (Quantity) and Size, in (4) 5/8–11 |
Standard Mounting Pattern (Bolt Circle Diameter), in 5.512 |
| Model BG4 | Unit Weight, lbm 83 | Max. Output Torque, lbf.ft 1,600 | Max. Thrust, lbf 30,000 | Gear Ratio 4:1 | Mech. Adv. 3.4 | Standard Mounting Pattern (Quantity) and Size, in (8) 1/2–13 |
Standard Mounting Pattern (Bolt Circle Diameter), in 7.625 |
| Model BG42 | Unit Weight, lbm 83 | Max. Output Torque, lbf.ft 1,600 | Max. Thrust, lbf 30,000 | Gear Ratio 8:1 | Mech. Adv. 6.12 | Standard Mounting Pattern (Quantity) and Size, in (8) 1/2–13 |
Standard Mounting Pattern (Bolt Circle Diameter), in 7.625 |
| Model BG44 | Unit Weight, lbm 115 | Max. Output Torque, lbf.ft 1,600 | Max. Thrust, lbf 30,000 | Gear Ratio 16:1 | Mech. Adv. 10.88 | Standard Mounting Pattern (Quantity) and Size, in (8) 1/2–13 |
Standard Mounting Pattern (Bolt Circle Diameter), in 7.625 |
| Model BG46 | Unit Weight, lbm 119 | Max. Output Torque, lbf.ft 1,600 | Max. Thrust, lbf 30,000 | Gear Ratio 24:1 | Mech. Adv. 16.32 | Standard Mounting Pattern (Quantity) and Size, in (8) 1/2–13 |
Standard Mounting Pattern (Bolt Circle Diameter), in 7.625 |
| Model BG424 | Unit Weight, lbm 117 | Max. Output Torque, lbf.ft 1,600 | Max. Thrust, lbf 30,000 | Gear Ratio 32:1 | Mech. Adv. 19.58 | Standard Mounting Pattern (Quantity) and Size, in (8) 1/2–13 |
Standard Mounting Pattern (Bolt Circle Diameter), in 7.625 |
| Model BG426 | Unit Weight, lbm 117 | Max. Output Torque, lbf.ft 1,600 | Max. Thrust, lbf 30,000 | Gear Ratio 48:1 | Mech. Adv. 29.38 | Standard Mounting Pattern (Quantity) and Size, in (8) 1/2–13 |
Standard Mounting Pattern (Bolt Circle Diameter), in 7.625 |
| Model BG4GT | Unit Weight, lbm 83 | Max. Output Torque, lbf.ft 2,300 | Max. Thrust, lbf 80,000 | Gear Ratio 4:1 | Mech. Adv. 3.4 | Standard Mounting Pattern (Quantity) and Size, in (8) 1/2–13 |
Standard Mounting Pattern (Bolt Circle Diameter), in 7.625 |
| Model BG42GT | Unit Weight, lbm 83 | Max. Output Torque, lbf.ft 2,300 | Max. Thrust, lbf 80,000 | Gear Ratio 8:1 | Mech. Adv. 6.12 | Standard Mounting Pattern (Quantity) and Size, in (8) 1/2–13 |
Standard Mounting Pattern (Bolt Circle Diameter), in 7.625 |
| Model BG44GT | Unit Weight, lbm 115 | Max. Output Torque, lbf.ft 2,300 | Max. Thrust, lbf 80,000 | Gear Ratio 16:1 | Mech. Adv. 10.88 | Standard Mounting Pattern (Quantity) and Size, in (8) 1/2–13 |
Standard Mounting Pattern (Bolt Circle Diameter), in 7.625 |
| Model BG46GT | Unit Weight, lbm 119 | Max. Output Torque, lbf.ft 2,300 | Max. Thrust, lbf 80,000 | Gear Ratio 24:1 | Mech. Adv. 16.32 | Standard Mounting Pattern (Quantity) and Size, in (8) 1/2–13 |
Standard Mounting Pattern (Bolt Circle Diameter), in 7.625 |
| Model BG424GT | Unit Weight, lbm 117 | Max. Output Torque, lbf.ft 2,300 | Max. Thrust, lbf 80,000 | Gear Ratio 32:1 | Mech. Adv. 19.58 | Standard Mounting Pattern (Quantity) and Size, in (8) 1/2–13 |
Standard Mounting Pattern (Bolt Circle Diameter), in 7.625 |
| Model BG426GT | Unit Weight, lbm 117 | Max. Output Torque, lbf.ft 2,300 | Max. Thrust, lbf 80,000 | Gear Ratio 48:1 | Mech. Adv. 29.38 | Standard Mounting Pattern (Quantity) and Size, in (8) 1/2–13 |
Standard Mounting Pattern (Bolt Circle Diameter), in 7.625 |
| Model BG6 | Unit Weight, lbm 210 | Max. Output Torque, lbf.ft 3,500 | Max. Thrust, lbf 150,000 | Gear Ratio 6:1 | Mech. Adv. 5.1 | Standard Mounting Pattern (Quantity) and Size, in (8) 3/4–10 |
Standard Mounting Pattern (Bolt Circle Diameter), in 11.732 |
| Model BG62 | Unit Weight, lbm 212 | Max. Output Torque, lbf.ft 3,500 | Max. Thrust, lbf 150,000 | Gear Ratio 12:1 | Mech. Adv. 9.18 | Standard Mounting Pattern (Quantity) and Size, in (8) 3/4–10 |
Standard Mounting Pattern (Bolt Circle Diameter), in 11.732 |
| Model BG64 | Unit Weight, lbm 242 | Max. Output Torque, lbf.ft 3,500 | Max. Thrust, lbf 150,000 | Gear Ratio 24:1 | Mech. Adv. 16.32 | Standard Mounting Pattern (Quantity) and Size, in (8) 3/4–10 |
Standard Mounting Pattern (Bolt Circle Diameter), in 11.732 |
| Model BG66 | Unit Weight, lbm 242 | Max. Output Torque, lbf.ft 3,500 | Max. Thrust, lbf 150,000 | Gear Ratio 36:1 | Mech. Adv. 24.48 | Standard Mounting Pattern (Quantity) and Size, in (8) 3/4–10 |
Standard Mounting Pattern (Bolt Circle Diameter), in 11.732 |
| Model BG624 | Unit Weight, lbm 245 | Max. Output Torque, lbf.ft 3,500 | Max. Thrust, lbf 150,000 | Gear Ratio 48:1 | Mech. Adv. 29.38 | Standard Mounting Pattern (Quantity) and Size, in (8) 3/4–10 |
Standard Mounting Pattern (Bolt Circle Diameter), in 11.732 |
| Model BG626 | Unit Weight, lbm 245 | Max. Output Torque, lbf.ft 3,500 | Max. Thrust, lbf 150,000 | Gear Ratio 72:1 | Mech. Adv. 44.11 | Standard Mounting Pattern (Quantity) and Size, in (8) 3/4–10 |
Standard Mounting Pattern (Bolt Circle Diameter), in 11.732 |
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, together with mounting hardware for the appropriate bevel gear output gear.
| Model | Part Number | Max. Bore, in | Min. Bore, in |
|---|---|---|---|
| Model BG3 Series | Part Number 24-008 | Max. Bore, in 1.750 | Min. Bore, in 0.500 |
| Model BG4 Series | Part Number 24-006 | Max. Bore, in 2.500 | Min. Bore, in 0.750 |
| Model BG6 Series | Part Number 24-003 | Max. Bore, in 4.375 | Min. Bore, in 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 valve's yoke nut. They are cast in ductile iron and are provided with mounting hardware for the appropriate bevel output gear.
| MODEL | Part Number |
|---|---|
| MODEL BG3 Series | Part Number 24-009 |
| MODEL BG4 Series | Part Number 24-007 |
| MODEL BG6 Series | Part Number 24-002 |
Handwheels are sold separately.
