ASCO solenoid valves

ASCO is the worldwide leader in the design and manufacture of quality solenoid valves. ASCO products are designed to control the flow of air, gas, water, oil, and steam. Our heritage of innovation has resulted in an extensive line of ASCO products that range from two positions on/off valves to entire flow control solutions designed to meet the requirements of thousands of customers. Whether you need a minor modification of a core product or a complete flow control solution, we can help.

Micro-miniature solenoid valves, sensors, pneumatic controls, and position indication technology with network communications capabilities have been recent additions to the ASCO line of products. ASCO’s heritage of innovation has resulted in an extensive line of products that range from two positions on/off valves to entire flow control solutions designed to provide thousands of customer-specific solutions.

In the late 1950s, ASCO begins to expand internationally. Now having manufacturing and sales in over 42 countries. In the mid-1970s additional products were introduced, such as air-operated valves, manual reset valves, and pressure and temperature switches to satisfy the ever-increasing demand for new applications. ASCO buys Angar Scientific in 1983 the manufacturer of micro-miniature solenoid valves, now known as ASCO Scientific. In 1985 ASCO is acquired by Emerson Electric Co., a Fortune 100 company located in St Louis, Missouri. Emerson ranks among the world’s largest and most respected industrial corporations. Emerson in 1988 buys Joucomatic, Europe’s leading name in pneumatic valves, and combines it into the ASCO family, now known in Europe as ASCO Joucomatic.

Some recent additions to the ASCO product line are pneumatic controls, sensors, and position indication technology with network communications capabilities.

Solenoid Valves

The solenoid is an electromagnetic part of a valve, comprised of a coil, coretube, core, and enclosure. ASCO Redhat brand offers the world’s largest selection of 2-, 3- and 4-way solenoid valves, designed to handle the most demanding fluid control applications.
ASCO Red Hat Logo


One inlet and one outlet, and are used to permit and shut off fluid flow. The two types of operations are “Normally Closed” and “Normally Open”.


These valves have three pipe connections and two orifices. When one orifice is open, the other is closed and vice versa. They’re commonly used to alternately apply pressure to and exhaust pressure from a valve actuator or a single-acting cylinder. These valves can be normally closed, normally open, or universal.


These valves have four or five pipe connections, commonly called ports. One pressure inlet, two-cylinder ports providing pressure to double-acting cylinder or actuator, and one or two outlets to exhaust pressure from the cylinders.
Condensate Drain Valve Assemblies

These valves are designed to automatically drain condensate in compressed air systems. The series features standard 2-way solenoid and piloted piston valves, along with an adjustable electronic timer.

ASCO Solenoid Valves

Direct Mount

These Series are standard 3-way and 4-way solenoid valves whose NPT pipe connections and mounting configurations have been replaced by NAMUR mounting configuration. This allows each valve to be mounted directly to an actuator without the use of hard piping or tubing.

Dust Collector

These series are high-flow fast-opening 2-way valves, pilot valves, pilot valve enclosures, and bulkhead fittings that have been specially designed for use in dust collector systems.

Group Mounted

These series are 2-way, 3-way, and 4-way 2-position valves that are designed for gang mounting into different quantities of valves. Any combination of normally closed, normally open, or universal valves may be grouped together.


Isolation valves incorporate a diaphragm that shields the fluid flowing through the valve from the internal solenoid components making them ideal for handling corrosive or high purity fluids. These valves are available with in-line porting or manifold constructions and in a wide variety of inert materials.

Manual Reset

These series are standard 2-way, 3-way, and 4-way 2-position valves that use a manual reset assembly in replacement of the solenoid. They are designed to prevent inadvertent valve startup in their designed failure modes. These series are available in no voltage release, electrically tripped, and free handle constructions as well as latched open or latched closed for 2-way valves.


Micro-Miniature General Service, Isolation, and Pinch valves for the reliable control of fluids and gases in medical equipment and analytical instrumentation.


Pinch valves are designed to control the flow of fluid by locating soft tubing in a mechanism that “pinches” the tubing to block flow and releases to allow flow. Pinch valves are suitable for corrosive fluids, high purity applications, or fluids with particulate.

S Series

ASCO commercial application solenoid valves. Developed and engineered with ASCO’s global resources. ASCO S is a compact solution for 2-way, 3-way, and steam valve applications and can operate in 15°F to 125°F ambient temperature locations. This solution includes a DIN connection for easy wiring, compact brass bodies, and encapsulated coils. Options include 15″ leads, alternate elastomers, manual operators, and mounting brackets.


ASCO offers a wide variety of accessories and optional features to meet your specific application requirements.

Learn more about ASCO solenoid valves