Powell Fabrication & Manufacturing, Inc.

Emergency Shutdown System (Automatic Valve Operators) for 1/4 Turn Valves

Versión en Español

UniPro™ QT (Quarter Turn) Pneumatic Emergency Valve Closure System

Avoid production slow downs, operator injury, or lengthy and expensive environmental cleanups by stopping dangerous chemical leaks with the UniPro™ QT Pneumatic Valve Closure System. The only quarter-turn emergency valve closure technology designed for 20-ton bullet tanks to 90-ton railcars, this patent-pending system prevents reportable releases of pressurized hazardous gases at the source. Plus, the UniPro™ QT system is uniquely designed for "quarter-turn" ball-type valves. Improve your Risk Management Planning (RMP) scenarios with a pneumatic-powered system that not only promises easy installation and low maintenance, but also superior performance and reliability.

UniPro QT

UniPro™ System Components


Designed to close a variety of ball-type angle valves on railcars and tank trucks with dome sizes 28 inches in diameter and larger. Operates valves with handles that close either toward the center of the dome or toward the dome wall. Several valve handle adapters are available for use with common ball-type valves.


Just 3.5 pounds and requires only 1 3/8-inch clearance (the thickness of an operator's hand) between valve handle and nearest obstruction for operation.


Ideal for applications where air or nitrogen are readily available. Requires 90 psig to operate. Fail-closed design operates even if AC power or air pressure is lost.


Easily opens valves with just a pull of the lever. Pushing the lever in the opposite direction closes the valve. Reversible feature requires an additional air line (90 psig) and does not interfere with emergency operation mode. Designed for low-torque valves only.

**Designed in accordance with The Chlorine Institute’s guidelines for valve closure systems.


Automatically responds to any alarm input, closing valves with 120 lb-ft of torque in less than 10 seconds.

Low Maintenance

Robust motor requires no lubrication, and is encased by an aluminum cover for protection and years of reliable service.

The UniPro™ QT Pneumatic Valve Closure System has been engineered, designed, and field-tested to ensure reliable performance while reducing installation time, maintenance, and material cost.

That’s Reliable Engineering.

TUniPro QT Dimensionshe UniPro™ QT is designed to stand alone as a complete system or to integrate and interface with existing unloading components. The included air supply hose has a safety swing coupling to ensure a secure connection between actuator and gas supply.


Easily mounts to the dome wall in seconds, without tools. Can be quickly removed from the valve handle without detaching from the dome wall to facilitate manual valve operation. Weighs just 28 pounds.


For use on containers of hydrogen chloride, vinyl chloride, monomer methyl mercaptan and other pressurized hazardous gases.

Designed for Durability

 The actuator is constructed of aircraft-quality aluminum and high-grade carbon and stainless steels for maximum service life. A two-step polyurethane coating provides corrosion protection.

Maximum Control

UniPro Control Panel

The UniPro™ Control Panel automatically activates the actuator to close the valve in the event of a gas leak, car movement, fire alarm, seismic event, security breach, process shutdown, or other monitored condition. You can also manually activate the system by depressing the emergency stop button on the panel



Air Control Unit

UniPro Air Control Unit

The air control unit supplies the proper amount of clean pressurized air to the system. Available in two sizes to operate up to six UniPro™ actuators simultaneously.


The UniPro™ Pneumatic Valve Closure System is engineered to be the most versatile, efficient, and reliable unit on the market. The system includes the actuator, control panel, air control unit, and air supply hose.


The UniPro™ name represents a whole family of pneumatic actuators for railcar and tanker applications, including the standard, reversible and low-torque models, all designed for plug-type valves, plus a quarter-turn model specifically designed for ball-type valves. The control panel, air control unit, and all optional system components work with any of our pneumatic actuators.

UL - CUL Approved

Powell Valve Closure System control panels (UniPro™, MaxPro™ RA & E-Pro®) are listed by Underwriters Laboratory to UL 508A for Enclosed Industrial Control Panels. Panels are listed by Underwriters Laboratory bearing the UL & CUL mark for use in the United States and Canada markets. In applications where a CSA listed control panel in Canada is required, please contact Powell for further information.