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Solenoid valve works and classification
Solenoid valves are electromagnetic controlled industrial equipment used in industrial control systems to adjust the direction, flow, speed and other parameters of the media. Solenoid valve is controlled by the electromagnetic effect, the main control by the relay control. In this way, the solenoid valve can cooperate with different circuits to achieve the desired control, while the control accuracy and flexibility can be guaranteed. Solenoid valve there are many, different solenoid valve in the control system to play a role in different locations, the most commonly used is the one-way valve, safety valve, directional control valve, speed control valve. Working principle Solenoid valve has a closed cavity, opened in different positions through-hole, each hole leads to different tubing, the middle of the valve is the valve, the two sides are two electromagnets, which side of the magnet coil body valve will be Is attracted to the side, by controlling the movement of the valve body to block 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 cylinder The piston, the piston and piston rod, piston rod driven mechanical device. This controls the mechanical movement by controlling the current flow through the electromagnet. New multi-function solenoid valve installation pipeline: both manual functions, eliminating the need for three manual valves, online maintenance, greatly reducing costs. 1, the medium viscosity adjustable range: regulation can achieve gas, water, oil, universal, easy to purchase, storage, installation and maintenance. 2, the valve opening and closing time adjustable: to meet a variety of different requirements, effectively prevent water hammer damage. 3, the valve opening can be adjusted: the maximum and minimum opening can be preset to improve the accuracy of automatic control. 4, the main valve wear and tear can be compensated :: extend the service life of the valve, withstand long-term test. 5, caliber: DN1-DN1200. 6, temperature: -196-450 ℃. Structure Principle The valve cleverly pilot solenoid valve, manual valve and throttle valve in one, the pilot valve to accept the electrical signal switch to bring the main valve action. Adjustment screw A, B can adjust the medium viscosity and the main valve opening time, and can be compensated after the main valve wear. Pilot valve need to be tightened as long as the adjustment screw B and isolation screw C, you can remove, and can be operated manually screw. The screw can also be used to preset the maximum or minimum flow rate when the solenoid valve is automatically controlled. Category 1. Solenoid valve from the principle is divided into three categories: 1) Direct Solenoid Valve: Principle: When energized, the electromagnetic coil electromagnetic force to produce the closure from the valve seat lift, the valve opens; power, the electromagnetic force Disappears, the spring pressure to close the valve seat, the valve closed. Features: In vacuum, negative pressure, zero pressure can work normally, but the path generally does not exceed 25mm. 2) step by step 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 power, the electromagnetic force directly to the pilot valve and the main valve closure Lift up in turn and 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. 3) Pilot solenoid valve: Principle: When the power is on, the electromagnetic force opens the pilot hole and the pressure in the upper chamber rapidly drops. The low and high pressure difference is formed around the closing member. The fluid pressure pushes the closing member to move upward and the valve opens. Electricity, the spring force to close the pilot hole, the inlet pressure through the bypass hole quickly chamber around the valve to form a low pressure on the next high, 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. 2. Solenoid valve from the valve structure and material differences between the principle and the difference is divided into six sub-categories: direct acting diaphragm structure, step-by-step diaphragm structure, the leading diaphragm structure, direct acting piston structure, Step-by-step dynamic piston structure, the pilot piston structure.