Solenoid Valve
An electromechanical valve using a magnetic coil to directly or indirectly control fluid flow. In valve automation, solenoid valves control the instrument air supply to pneumatic actuators - energising/de-energising the solenoid opens or closes the air path, driving the valve open or closed.
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What is a Solenoid Valve?
An electromechanical valve using a magnetic coil to directly or indirectly control fluid flow. In valve automation, solenoid valves control the instrument air supply to pneumatic actuators - energising/de-energising the solenoid opens or closes the air path, driving the valve open or closed.
How is a Solenoid Valve sized for a valve?
Actuator sizing requires the valve's breakaway torque (BTO), running torque (RTO), and end-to-close torque (ETO) at the maximum differential pressure and operating temperature. The actuator output torque at minimum supply pressure must exceed the valve BTO by a safety factor (typically 1.25x minimum). For pneumatic actuators, the supply pressure range, fail-safe direction (spring return FC or FO), and speed requirements must also be specified.
When is a Solenoid Valve required versus manual operation?
Automation is required when: (1) the valve is in a remote or hazardous location, (2) rapid opening/closing is needed for emergency shutdown (ESD), (3) the valve must respond to a control signal (4–20 mA, HART, or fieldbus), (4) the operating torque is too high for manual operation, or (5) the valve is part of a Safety Instrumented System (SIS) requiring SIL certification. Contact Vajra Industrial Solutions for fully automated valve packages including actuator, limit switch, solenoid, and positioner.
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