ASCO™ Series 158 and 159

Motorized Gas Safety Shut-off Valve and Actuator

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ASCO 158 & 159

Integrated Safety Shut-Off + Pressure Regulation for Modern Burner Systems

The ASCO Series 158 valve and Series 159 actuator bring together certified gas safety shut-off and electronic pressure regulation in one compact solution—designed to simplify gas trains, improve reliability, and support high-performance burner applications.

Why this matters: Contractors, OEMs, and combustion teams are under pressure to reduce complexity without sacrificing safety or performance. The 158/159 platform helps by combining multiple functions into one compact solution—reducing components, supporting easier installs, and delivering strong performance across a wide operating range.

Why the 158/159 Platform Stands Out

High Performance Range

Broad pressure capability, high close-off pressure, strong flow factor, and wide temperature tolerance help support more demanding burner applications.

Set & Forget Simplicity

User-friendly pressure adjustment and protected settings help simplify setup while reducing the risk of unwanted changes in the field.

Less Hardware, Smaller Gas Train

By combining shut-off and pressure regulation in one unit, the 158/159 can reduce gas train size, simplify layouts, and lower system complexity.

Series 158 Valves

The ASCO Series 158 Single and Monoblock valve bodies are 2-way normally closed gas safety shut-off valves designed for use with the Series 159 motorized actuator. Built for burner applications, this valve platform supports global certifications including UL, FM, CSA, and EN161 when paired with the Series 159 actuator.

Flow & pressure range: Optimized high-flow design with broad operating pressure differential for a wide range of applications.

Monoblock construction: Helps simplify installation and reduce overall footprint.

Environmental range: Suitable for hot or frigid environments from -40°F to 150°F.

Installation flexibility: Offered in 3/4" to 3" NPT / DN20 to DN80 ISO sizes with pipe adapters available.

Flexible mounting: Multi-position field mounting supports installation in any orientation.

Global approvals: UL Listed, FM Approved, CSA Certified, and EN161 Class A certified.

Series 159 Actuators

The ASCO Series 159 motorized actuator is available in On/Off and High/Low/Off construction. This self-contained electrohydraulic linear actuator uses dual internal control valves for repeatable positioning and provides clear visual indication of valve position when mounted to a Series 158 valve.

Application flexibility: Slow- or fast-opening constructions support a variety of burner applications.

Wide temperature tolerance: Designed for reliable operation from -40°F to 150°F.

General purpose enclosure: Type 1 / IP10 standard, with optional watertight Type 4 / IP65 versions available.

Durability: Rugged construction supports long-term reliability in demanding environments.

Visual feedback: Open and closed position indication is standard, with optional proof-of-closure switch available.

Mounting freedom: Mountable in any position for greater installation flexibility.

One Unit. Better Performance. Less Complexity.

The 158/159 series combines certified safety shut-off and certified electronic pressure regulation in a single device. That means fewer upstream components, less commissioning complexity, and a more compact gas train—while still delivering strong close-off pressure, high flow, and stable burner performance.

How It Helps in the Real World

Boost Reliability & Safety Maintain burner performance in challenging environments and reduce shutdown risk tied to pressure drops during high-demand periods.

Simplify the Gas Train Replace multiple components with one integrated solution for safety shut-off and pressure regulation.

Reduce Commissioning Time Set the regulator once and streamline startup with a more repeatable, user-friendly setup process.

The Bottom Line

The ASCO 158/159 platform gives contractors, OEMs, and combustion teams a compact way to improve safety, reduce gas train complexity, and support high-performance burner applications—all in one integrated solution.

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