Article How It Works: Pipeline Safety
Choosing the right valve for your application is the first step in achieving a safer pipeline operation.
Dynatorque D-Lock
Valve-locking device
Overview
The Dynatorque D-Lock™ valve-locking device is used with automated valves (pneumatic, hydraulic, or electric) that require lockout capability to prevent valve rotation. It is mounted between the valve and actuator.
Applications
- Maintenance shutdowns
- Ideal for torque-seated valves, which require a constant torque load to prevent leakage (e.g., triple-offset butterfly valves)
- Suitable for almost any rotating device
Benefits
Enhances safety when the valve must remain in the locked position even if an actuator is unintentionally engaged.
Features
- The Dynatorque D-Lock device can hold a valve in either open or closed position, while compensating for hysteresis and machining tolerances.
- The devices are totally enclosed, weather resistant, and permanently lubricated.
- Select models provide locking in both open and closed positions.
Tech Specs
| Model |
Unit Weight, lbm | Max. Valve Actuator Torque, lbf.in | Gear Ratio | Turns for 90° | Standard Output Bore, in | Standard Key Size, in | Standard Mounting Pattern (Quantity and Size) | Standard Mounting Pattern (Bolt Circle Diameter), in |
| 3D |
13.5 | 3,000 | 30:1 | 7.5 | 1.250 | 0.25 × 0.18 | (4) 5/16-18 | 2.756 |
| 12 | 39 | 12,000 | 57:1 | 14.25 | 2.000 | 0.375 × 0.375 |
(4) 1/2-13 | 4.921 |
| 21 | 56 | 21,000 | 44:1 | 11 | 2.500 | 0.500 × 0.500 |
(4) 5/8-11 | 5.512 |
| 36 | 111 | 63,000 | 53:1 | 13.25 | 3.250 | 0.750 × 0.750 |
(8) 5/8-11 | 6.496 |
| 60 | 207 | 140,000 | 60:1 | 15 | 4.000 | 1.000 × 1.000 |
(8) 5/8-11 | 10.000 |
| 260 | 672 | 260,000 | 100:1 | 25 | 6.250 | 1.50 × 1.00 | (8)1 1/8-7 | 14.016 |
Notes
- Mechanical advantage is not required because the valve's lockout position is reached using the powered device. The gears in the Dynatorque D-Lock device move it to the lock position under no-load conditions.
- The device can be operated with a standard 3/4-in socket, box end, or adjustable wrench. (These tools are not supplied as part of this lockout package.)
- The device is not field adjustable. It must be ordered as "lock clockwise" or "lock counterclockwise." Provisions must be made to prevent each component in the valve automation package from rotating independently. All components should be pinned together at assembly to prevent inadvertent rotation.
- If automated valve accessories are installed in corrosive environments, consider using stainless steel drivers instead of standard carbon steel drivers.
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