Pilot operated solenoid valve

Pilot operated solenoid valve

What is a pilot operated solenoid valve?

A valve is used to direct and control the flow of fluid through full or partial opening or closing of it. One such type of valve is the Pilot Operated Solenoid Valve. It opens and closes itself by using the differential pressure of the medium over the valve.

These valves can operate at high temperatures and high pressure using minimum power. Thus providing a high flow rate. They are also known as servo assisted solenoids. The operation of the Pilot solenoid valve is assisted by the small chamber above the diaphragm. The fluid enters the chamber through an inlet port in a closed valve. This then compresses it against the diaphragm making a closing seal with the seat.

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Pilot Operated Solenoid Valve Specification

External pilot solenoid valves suppliers in UAE

How does pilot an operated solenoid valve work?

This valve has 2 parts the solenoid and the valve. The valve is opened or closed when the electrical energy is converted into mechanical energy by the solenoids. It may have a metal seal or rubber seal along with an electrical interface to control it. Pilot operated directional control valve consists of a pilot valve and a slave valve. When the solenoid energizes the pilot directs the flow to move the slave valve thus directing the flow to the hydraulic circuit.

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How do you test if a pilot solenoid valve is working?

One can use a digital multimeter to test the valve. The multimeter can be set at 2000 omps and can be connected to the valve. The reading should usually be between 0-50 omps. Make sure that it is not zero. If it turns out to be zero means that one of the calls is short.

Pilot operated diaphragm valves are the go-to valves if your application involves a large flow of fluids. It offers a pressure assisted valve flow operation. Pilot operated spool valve requires low electricity and minimum differential pressure for its operation. It is said to be more economical for values with higher flow rates. They are mainly used in gaseous media or liquid media. With little or no differential pressure available.

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How do you manually run an external pilot operated solenoid valve?

These valves are designed in a way that they have a manual override to move the spool without the use of pilot pressure to start the system. You normally turn the solenoid clockwise for about a quarter until you feel the fluid rushing. Pilot operated directional valves basically allow the free flow of fluid from the inlet to the outlet port thus allowing air to pass from the top in the process.

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Does the external pilot solenoid valve need pressure?

Since the seal is a part of the moving core these valves do not require pressure. They will remain closed even if no pressure is applied. External pilot operated solenoid valves are therefore used in applications involving gases and vapours, or neutral and clean liquid. External pilot solenoid valves are designed in a way that they can cope with particle debris and are suitable for negative pressure circuits. A miniature version of these valves is also available to be used in high pressure environments.

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How fast can a pilot operated diaphragm valve open and close?

It can be opened at a fluid velocity of 10-12 feet per second in case the fluid is water. However, to check for the cracking pressure one can open the valve at 4-8 feet per second. If the Solenoid controlled pilot operated directional control valve is oversized the flow rate will be low and the valve will not be fully open.

Moreover, if the Hydraulic pilot operated directional control valve is undersized then there are chances that the high flow rate may damage the valve. It may increase the corrosive wear and tear inside the valve.