Pilot Operated Solenoid Valve

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A pilot-operated solenoid valve is a type of valve that uses a combination of a solenoid actuator and a pilot valve to control the flow of fluid. It is designed to handle higher pressures and flow rates compared to direct-acting solenoid valves.

The pilot-operated solenoid valve consists of two main components: the main valve and the pilot valve. The main valve is responsible for regulating the flow of fluid, while the pilot valve controls the opening and closing of the main valve.

Working of Pilot operated solenoid valve:

  1. In the de-energized state: When the solenoid coil is not powered, the pilot valve is closed. This prevents the flow of fluid through the main valve.
  2. Energizing the solenoid coil: When an electric current is applied to the solenoid coil, it generates a magnetic field that lifts the plunger or armature. This movement opens the pilot valve, allowing a small amount of fluid to flow through it.
  3. Pilot valve operation: The fluid flowing through the pilot valve creates a pressure differential. This pressure differential acts on a diaphragm or piston inside the pilot valve, helping to hold it open even after the solenoid coil is de-energized.
  4. Main valve operation: With the pilot valve open, the pressure from the fluid enters the main valve, which is designed to handle higher pressures. The pressure differential across the main valve causes it to open, allowing a larger flow of fluid through the valve.
  5. De-energizing the solenoid coil: When the electric current to the solenoid coil is removed or reversed, the magnetic field dissipates. This allows the pilot valve to close, cutting off the flow of fluid through the main valve. The main valve then closes under the influence of springs or other mechanical mechanisms.

Pilot-operated solenoid valves are commonly used in applications that require precise control, high flow rates, or handling of high pressures. They are often found in industrial processes, oil and gas systems, water treatment plants, and other applications where reliable and efficient fluid control is necessary.

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