Solenoid valve works and classification

Solenoid valve is used to control the fluid of the basic components of automation, are actuators; is not limited to hydraulic, pneumatic. Solenoid valve used to control the direction of hydraulic flow, the factory's mechanical devices are generally controlled by the hydraulic steel, it will use the solenoid valve. How it works: Solenoid valve has a closed cavity, at different locations open through-hole, each hole leads to different tubing, the middle of the cavity valve, two sides are two electromagnets, which side of the magnet coil body valve Will be attracted to which side by moving the valve body to stop or leak different drain hole, and the inlet hole is normally open, the hydraulic oil will enter the different drain pipe, and then through the oil pressure To promote the oil just piston, the piston and piston rod, piston rod driven mechanical device. This controls the mechanical movement by controlling the electromagnet current. Category: â‘  Direct-acting electromagnetic valve principle: When energized, the electromagnetic coil generates electromagnetic force to lift the closing piece from the valve seat, the valve opens; when the power is off, the electromagnetic force disappears, the spring presses the closing piece on the valve seat, the valve closes . Features: In vacuum, negative pressure, zero pressure can work normally, but the path generally does not exceed 25mm. â‘¡ distribution of direct-acting solenoid valve principle: it is a direct acting and pilot-based combination of principles, when there is no pressure difference between the inlet and outlet, the electricity, the electromagnetic force directly to the pilot valve and the main valve closing member up The valve opens. When the inlet and outlet to achieve the start of the pressure difference, the electricity, the solenoid pilot small valve, the main valve lower chamber pressure rises, the pressure on the chamber down, so that the use of pressure to push the main valve open; power, the pilot valve spring Force or media pressure to push the closure, move down, the valve closed. Features: At zero pressure or vacuum, high pressure can also be * action, but the power is larger, the requirement must be horizontal installation. â‘¢ Pilot solenoid valve principle: When power is on, the electromagnetic force opens the pilot hole, and the pressure in the upper chamber quickly drops, forming a pressure drop on the low and high sides of the closing member. The fluid pressure pushes the closing member to move upward and the valve opens. , The spring force to close the pilot hole, the inlet pressure quickly through the bypass hole in the chamber around the valve to form a low pressure on the high, the fluid pressure to promote closure of the move down to close the valve. Features: High fluid pressure range high, can be installed (to be customized), but must meet the fluid pressure conditions. In the use of more should consider some of its features, such as medium characteristics, ambient temperature, operating frequency, power and other factors. Solenoid valve at home and abroad from the principle is divided into three categories (ie: direct-acting, step-by-step direct-acting, pilot-based), and from the valve structure and material differences and the principle of the distinction is divided into six Sub-categories (direct acting diaphragm structure, step-grate structure, leading diaphragm structure, direct acting piston structure, step-by-step piston structure, pilot piston structure).

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