What are Solenoid Valves?
- A solenoid valve is an electromechanically operated valve which consists of an electromagnetic actuator (solenoid) and a valve body. Ordinary solenoid valves are two-position valves. There is no intermediate, or in-between position, so there is no way for the solenoid to throttle flow.
- Proportional solenoid valves are a special type of solenoid valve that can throttle flow or pressure in response to the electrical input. For a solenoid valve to become a proportional valve, the plunger position is controlled by balancing it using an external force usually done by a spring.
- A solenoid valve has two main parts: the solenoid which is responsible for the opening and closing of the valve; and the valve body which contains the fluid and its pressure.
- Solenoid valves can be categorized according to its operation and flow paths or circuit function. Solenoid valve operation can be direct-acting, internally piloted, externally piloted or semi-direct.
- Circuit functions of solenoid valves are two-way which is the normal open and close valves; three-way which features an exhaust port for relieving pressure; and four-way which is used in flow diversion.
- The valve body can be constructed by a variety of materials. Factors such as the fluid properties, environment characteristics and cost affect the material specifications of the valve.
- Specifying the required approvals and certifications is one of the ways to ensure purchasing a satisfactory solenoid valve. Compliance to standards set by international organizations guarantees product safety and quality.