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Principles and types of solenoid valves
Author:神威气动Source:www.diancifa.ccUpdate time:2024-08-27 05:10:22 Read:
The principles and types of solenoid valves trace the development history of solenoid valves. So far, solenoid valves at home and abroad are divided into three categories in principle (namely: direct-acting type, step-operated type), and from valve The differences in valve structure and materials and principles are divided into six subcategories (direct-acting diaphragm structure, step-by-step heavy disc structure, pilot diaphragm structure, direct-acting piston structure, step-by-step direct-acting piston structure, Pilot piston structure). Direct-acting solenoid valve: 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. Distributed 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 lifts the pilot small valve and the main valve closing member upward in sequence. , 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. Pilot solenoid valve: Principle: When the power is on, the electromagnetic force opens the pilot hole, and the pressure in the upper chamber drops rapidly, forming a pressure difference between the upper and lower parts around the closing part. The fluid pressure pushes the closing part to move upward, and the valve opens;when the power is turned off, , the spring force closes the pilot hole, and the inlet pressure quickly passes through the bypass hole and forms a pressure difference between the lower and upper parts around the valve closing part. The fluid pressure pushes the closing part downward to 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.
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