Industry Expertise

Functional Safety

Functional safety systems & expertise


​For years, ASCO solenoid pilot valves and Redundant Control Systems (RCS) have played an important role in safety instrumented systems (SISs). With manual reset and fully redundant options, ASCO functional safety products are proven in use, certified per IEC 61508 Parts 1 and 2, and rated SIL 3 capable for domestic and international markets (ATEX). The ASCO RCS is the only pilot valve system that has no single point of failure that could result in an unwanted closure of the process valve. Self-diagnostic testing ensures higher asset availability with less risk of spurious trips. That's why so many engineers responsible for mission-critical applications in areas such as refining and power generation turn to ASCO for functional safety systems and expertise.

View White Paper - Effective Compliance With IEC 61508 When Selecting Solenoid Valves for Safety Systems

Pilot Valves - ASCO 3-way solenoid valves, 314, 316, 320, 327, 551, and 553 are the most widely used solenoid pilot valves in the world. For your spring return actuator applications, these valves are proven in use and have undergone 3rd party evaluation by Exida per IEC 61508 Parts 1 & 2. Most of the ASCO 314, 316, 320, 327, 551, and 553 series valves are SIL 3 capable, certified by Exida. Individual pilot valves are most commonly used in 1-out-of-1 voting architectures but can be easily piped into a 2-out-of-2 configuration. ASCO pilot valves are used as the primary device for process valve actuation as well as the shutdown valve when used with digital valve controllers for on-off and control valve applications. SIL 3 Capable, Certified by Exida.

Manual Reset & Redundant Coil Pilot Valves - ASCO Manual Reset Pilot Valves are a process industry standard. For harsh plant environments where reliability is a must, ASCO has the products to keep your process going. Lever operated manual reset valves are designed with corrosion resistant materials and industrial strength components. When you need to manually engage the final control element of your process system, ASCO has the proven solutions for your applications. Redundant coil pilot valves are also available for your high availability applications.

Redundant Control Systems - The ASCO RCS is a redundant pilot valve system that acts as a single 3-way valve. The added features of this system above an individual valve include the ability to perform automatic online testing of the redundant solenoid valves, automatic partial stroke testing of the process valve, and online maintenance capabilities. This product is built for high reliability applications and functional safety. The redundant solenoids can operate in 1-out-of-1 Hot Standby mode or 2-out-of-2 diagnostic mode. Both modes of operation are certified per IEC 61508 Parts 1 and 2 and SIL 3 Capable, Certified by Exida (SIL Certificate and SIL Certificate for Stainless Steel Units), ATEX Approved.

View All ASCO Capabilities & Expertise