There is a closed cavity in the solenoid valve, with through holes at different positions. Each hole leads to the oil pipe of a different solenoid valve.
There is a valve in the middle of the cavity, and two valves on both sides. A piece of electromagnet, which side of the magnet coil is energized, the valve body will be attracted to that side, and the movement of the valve body is controlled to block or leak different oil drain holes. The oil inlet hole is normally open, and the hydraulic oil will Entering different oil discharge pipes, the piston of the oil cylinder is pushed by the pressure of the oil, and the piston drives the piston rod, which drives the mechanical device. In this way, the mechanical movement is controlled by controlling the current on and off of the electromagnet
1. Solenoid valves are divided into three categories in principle: Solenoid valves
1) Direct-acting solenoid valves : Principle: When the power is on, the solenoid coil 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. 2) Step-by-step direct-acting solenoid valve: Principle: It is a principle that combines direct-acting and pilot-operated. When there is no pressure difference between the inlet and outlet, after power is turned on, the electromagnetic force directly closes the pilot small valve and the main valve. Lift up in turn and the valve opens. When the inlet and outlet reach the starting pressure difference, after power is turned on, the electromagnetic force pilots the small valve. The pressure in the lower chamber of the main valve increases and the pressure in the upper chamber decreases, thereby using the pressure difference to push the main valve upward; when the power is turned off, the pilot valve uses the spring Force or medium pressure pushes the closing member to move downward to close the valve. Features: It can operate safely under zero pressure difference or vacuum or high pressure, but the power is large and it must be installed horizontally. 3) Pilot solenoid valve: Principle: When energized, the electromagnetic force opens the pilot hole, and the pressure in the upper chamber drops rapidly, forming an upper, lower, and higher pressure difference around the closing part of the solenoid valve. The fluid pressure Push the closing member to move upward, and the valve opens; when the power is off, the spring force closes the pilot hole, and the inlet pressure quickly passes through the bypass hole to form a pressure difference between the lower and upper chambers around the closing member, and the fluid pressure pushes the closing member downward. Move, close the valve. Features: The upper limit of the fluid pressure range is relatively high and can be installed arbitrarily (customization is required) but the fluid pressure difference condition must be met. 2. Solenoid valves are divided into six subcategories based on differences in valve structure, materials and principles: direct-acting diaphragm structure, step-by-step direct-acting diaphragm structure, pilot diaphragm structure, direct-acting piston structure, Step-by-step direct-acting piston structure and pilot piston structure. 3. Solenoid valve - functional classification water solenoid valve large diameter gas solenoid valve steam solenoid valve refrigeration solenoid valve three-way solenoid valve
with signal feedback solenoid valve ultra-low temperature solenoid valve pilot solenoid valve low temperature solenoid valve gas solenoid valve Valve
Pulse aluminum alloy solenoid valve diaphragm solenoid valve fire solenoid valve ammonia solenoid valve gas solenoid valve
Zero pressure start solenoid valve ultra high temperature solenoid valve liquid solenoid valve fountain solenoid valve Micro solenoid valve
High pressure piston solenoid valve Internal thread solenoid valve Normally closed solenoid valve Hot water solenoid valve Pulse solenoid valve
Two position five-way solenoid valve Hydraulic solenoid valve Normally open solenoid valve oil Use solenoid valves DC solenoid valves
Two-position three-way solenoid valves Corrosion-resistant solenoid valves Signal solenoid valves Water inlet solenoid valves High-pressure solenoid valves
Right-angle pulse solenoid valves Stainless steel solenoid valves Flange solenoid valves Valve Plastic solenoid valve Explosion-proof solenoid valve
Adjustable flow solenoid valve Direct-acting solenoid valve Brass solenoid valve Vacuum solenoid valve Universal solenoid valve