Powell Fabrication & Manufacturing, Inc.

Electric Shutdown (Automatic Valve Operators) Systems

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Powell Valve Closure Systems

FAQ about Electric Valve Closure Systems for 150 lb Cylinders and Ton Containers

How much power is required? How does it mount on the valve? Can it accommodate a vacuum regulator (chlorinator)? How does it detect a leak? More...


Compressed Gas Valves

Various Cylinder, Ton Container, and Railcar Valves compatible with both Electric and Pneumatic actuators.  More...


UL-CUL Approved

Powell Valve Closure System control panels (UniPro family, 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.

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E-Pro® Electric Valve Closure System for 150 lb Gas Cylinders and Ton Containers

E-Pro System - electric emergency shutdown system for valves on 150 lb cylinders and ton containersDesigned for both ton containers and 150-lb gas cylinders, the E-Pro® Electric Valve Closure System prevents reportable releases of pressurized hazardous gases at the source. Improve your Risk Management Planning (RMP) scenarios with an electric-powered system that not only promises convenient and easy installation, but also superior performance and reliability.


Uses standard 120-volt AC power. Ideal for smaller plants or remote facilities without compressed air or nitrogen required by pneumatic systems. Unlike battery-powered units, there is no worry of system failure when the batteries discharge.


Applicable to a variety of valve designs and hazardous chemicals in 150lb cylinders and ton containers, including but not limited to:

1,3-Butadiene Anhydrous Ammonia Bromomethane Butane
Carbon Dioxide Chlorine* Chloroethane Chloromethane
Dimethylamine Ethylene Ethylene Oxide Hydrogen Chloride
Hydrogen Cyanide Hydrogen Fluoride Methyl Mercaptan Propane
Sulfur Dioxide Trimethylamine Vinyl Chloride Monomer

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

Also accommodates vacuum regulators (chlorinators).


E-Pro Valve Closure System Designed for both ton containers and 150-lb gas cylinders. Unique mounting bracket easily attaches and detaches from the valve stem in seconds, without tools.


Only 8.5 pounds – makes handling the system safer and easier. Also reduces cantilever stresses when mounted horizontally on 1-ton containers.


Mounts on the valve body, not the yoke. This prevents any torque from being transferred to the yoke, which could cause the lead gasket between the yoke and the cylinder valve or container valve to fail, causing a leak.


ton container and 150 lb cylinder valvesThe unique, new mounting bracket can be mated to any of several available valve adapters - allowing the system to be used on valves commonly found on chlorine cylinders, chlorine ton containers, sulfur dioxide cylinders, sulfur dioxide ton containers, anhydrous ammonia cylinders, anhydrous ammonia ton containers, liquid hydrogen chloride cylinders, liquid hydrogen chloride containers, and many more. Following is an example of the various kinds of valves the E-Pro system is compatible with:

Ceodeux Chlorine or Sulfur Dioxide Cylinder Valve (USA/Europe) HSB Compressed Gas Valve (Egypt) Parva Brazil Compressed Gas Valves (South America) SA China Compressed Gas Valves
Sherwood Anhydrous Ammonia External Thread Compressed Gas Valves (USA) Sherwood Anhydrous Ammonia Internal Thread Compressed Gas Valves (USA) Sherwood Compressed Gas Valve for Chlorine or Sulfur Dioxide (USA) Sherwood Liquid Hydrogen Chloride Valve (USA)


Automatically responds to any alarm input, closing valves with 40 lb-ft of torque in less than 5 seconds.

Designed and field-tested, the E-Pro® Electric Valve Closure System was two years in the making. The result: A unique system that delivers superior performance, durability and reliability.

That’s Reliable Engineering.

System Components

E-Pro Valve Closure System

Every component of the E-Pro® Electric Valve Closure System is engineered to be more versatile, efficient, and reliable than alternative units on the market. The System includes the actuator, control panel and mounting bracket.


A push button on the end of the actuator makes it easy to re-open any non-leaking valve.


The actuator is constructed of aircraft-quality aluminum and high-grade carbon and stainless steels for maximum service life. Its housing is sealed to prevent intrusion from wind and water in outdoor applications. While a two-step polyurethane coating provides corrosion protection.

The E-Pro® system’s unique mounting mechanism, coupled with its lightweight, compact design, make it especially suited for horizontal application on 1-ton containers.

Maximum Control

UniPro Control Panel

The E-Pro® 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.

Click "play" to watch a video of the E-Pro Electric Valve Closure System