What is a solenoid valve

What is a solenoid valve

The response time of the solenoid valve can be as short as a few milliseconds, and even the pilot solenoid valve can be controlled within tens of milliseconds. Since it is a self-contained circuit, it is more sensitive than other automatic control valves. A properly designed solenoid valve coil has very low power consumption and is an energy-saving product; it can also be able to automatically maintain the valve position only by triggering the action, and it does not consume electricity at all. The solenoid valve is small in size, which saves space and is light and beautiful.
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COVNA Industrial Automation Co., Ltd. was established in 2000, an automated valve specialist. Headquartered in Dongguan China, with 3 production bases located in Ningbo, Wenzhou and Dongguan. 

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Step-by-step direct-acting solenoid valve

Principle: It is a combination of direct action and pilot type. When there is no pressure difference between the inlet and the outlet, the electromagnetic force directly lifts the pilot small valve and the main valve closing member upwards in turn, and the valve opens. When the inlet and outlet reach the start-up pressure difference, after energization, the electromagnetic force pilots the small valve, the pressure in the lower chamber of the main valve rises, and the pressure in the upper chamber drops, so that the pressure difference pushes the main valve upward; when the power is off, the pilot valve uses a spring The force or medium pressure pushes the closing piece and moves downward to close the valve.
Features: It can be operated under zero pressure difference, vacuum or high pressure, but the power is large, and it must be installed horizontally.

Step-by-step direct-acting solenoid valve

Classification of solenoid valves

There are many kinds of solenoid valves. Solenoid valves are divided into three categories in principle (ie: direct-acting, step-by-step pilot-operated), and the differences in the structure and material of the disc and the difference in principle are divided into six Sub-categories (direct-acting diaphragm structure, step-by-step double-piece structure, pilot diaphragm structure, direct-acting piston structure, step-by-step direct-acting piston structure, pilot piston structure).

Classification of solenoid valves

Pilot solenoid valve

Principle: When energized, electromagnetic force opens the pilot hole, the pressure in the upper chamber drops rapidly, and a high pressure difference is formed around the closing part. The fluid pressure pushes the closing part to move upward and the valve opens; when the power is off, the spring force controls the pilot The hole is closed, and the inlet pressure passes through the bypass hole and the chamber quickly forms a low and high pressure difference around the valve closing member, and the fluid pressure pushes the closing member to move downward to close the valve.
Features: The upper limit of the fluid pressure range is high, and it can be installed arbitrarily (customization is required) but the fluid pressure difference condition must be met.

Pilot solenoid valve

Direct Acting Solenoid Valve

Principle: When energized, the solenoid generates electromagnetic force to lift the closing member from the valve seat, and the valve opens; when the power is off, the electromagnetic force disappears, and the spring presses the closing member on the valve seat, and the valve closes.
Features: It can work normally under vacuum, negative pressure and zero pressure, but the diameter generally does not exceed 25mm.

Direct Acting Solenoid Valve
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Frequently Asked Question

Do you have any question?

There is a closed cavity in the solenoid valve with through holes at different positions. Each hole leads to a different oil pipe. In the middle of the cavity is the valve. On both sides are two electromagnets. Where it is attracted, by controlling the movement of the valve body to block or leak out the different drain holes, and the oil inlet hole is normally open, the hydraulic oil will enter the different drain pipes, and then push the oil through the oil pressure The rigid piston, the piston drives the piston rod, and the piston rod drives the mechanical device to move. In this way, the mechanical movement is controlled by controlling the current of the electromagnet

The solenoid valve is the control element, mainly used to control the cylinder. There are also analytical instruments or other spray guns used to directly control the gas. Solenoid valves are divided into two types: pneumatic and hydraulic. The working methods are the same, but the medium is different. The working principle is to open several holes in a valve body, and then use electromagnetic induction to control the movement of the valve stem to control which hole is blocked, or which hole is let out. In order to achieve the purpose of control.

Common uses. Solenoid valves are used in fluid power pneumatic and hydraulic systems, to control cylinders, fluid power motors or larger industrial valves. Automatic irrigation sprinkler systems also use solenoid valves with an automatic controller.

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