Classification Principle of CAMOZZI Solenoid Valve

Brief introduction of solenoid valve
Solenoid valve is an automatic basic component to control the direction of fluid, which belongs to actuator. It is usually used on mechanical control and industrial valve to control the direction of medium, so as to achieve the control of valve switch.

Classification Principle of CAMOZZI Solenoid Valve
Classification of solenoid valves

1. Solenoid valves can be divided into three categories in principle:

1) Direct-acting solenoid valve:

Principle: When electrified, the electromagnetic coil produces electromagnetic force to lift the closing part from the valve seat, and the valve opens; when power is cut off, the electromagnetic force disappears, and the spring presses the closing part on the valve seat, and the valve closes.

Characteristic: It can work normally in vacuum, negative pressure and zero pressure, but its diameter generally does not exceed 25 mm.

2) Distributed direct-acting solenoid valve:

Principle: It is a combination of direct and pilot principle. When there is no pressure difference between the inlet and the outlet, the electromagnetic force directly lifts the pilot valve and the main valve closing parts upward, and the valve opens.  When the inlet and outlet reach the start-up pressure difference, after electrification, the electromagnetic force leads the small valve, the lower chamber pressure of the main valve rises, and the upper chamber pressure decreases, so that the main valve is pushed upward by the pressure difference; when power is cut off, the pilot valve uses spring force or medium pressure to push the closing parts downward, so that the valve closes.

Characteristic: It can also operate at zero pressure difference or vacuum or high voltage, but the power is large, which requires horizontal installation.

3) Pilot solenoid valve:

Principle: When electrified, the electromagnetic force opens the pilot hole, and the pressure of the upper chamber drops rapidly, forming a high differential pressure around the closing part. The fluid pressure pushes the closing part upward and the valve opens. When the power is cut off, the spring force closes the pilot hole, and the inlet pressure quickly forms a low pressure around the closing part through the bypass hole. High differential pressure, fluid pressure pushes the closure down and closes the valve.

Features: The upper limit of fluid pressure range is high. It can be installed arbitrarily (customized), but the condition of fluid pressure difference must be satisfied.

2. Solenoid valves are divided into six sub-categories according to their different structure and material and principle.

Direct diaphragm structure, step-by-step heavy plate structure, pilot diaphragm structure, direct piston structure, step-by-step direct piston structure, pilot piston structure. Solenoid Valve in Selection

Classification Principle of CAMOZZI Solenoid Valve
Working Principle of Solenoid Valve
There are closed chambers in solenoid valves. There are through holes in different positions. Each hole leads to different oil pipes. In the middle of the cavity is a valve, and on both sides are two electromagnets. The magnet coil electrifying valve body on which side will be attracted. By controlling the movement of the valve body, different oil drain holes can be blocked or leaked out, while the oil inlet hole is often open. Hydraulic oil will enter different drain pipes, and then push the piston of the cylinder through the pressure of the oil. The piston will drive the piston rod, and the piston rod will drive the mechanical device. In this way, the mechanical motion is controlled by controlling the current of the electromagnet.