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COVNA Industrial Automation Co., Ltd. was established in 2000, an automated valve specialist. Headquartered in Dongguan China, with 3 production bases located in Ningbo, Wenzhou and Dongguan.
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Principle: When energized, the solenoid 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.
There are many kinds of solenoid valves. Solenoid valves are divided into three categories in principle (ie: direct-acting, step-by-step pilot-operated), and the differences in the structure and material of the disc and the difference in principle are divided into six Sub-categories (direct-acting diaphragm structure, step-by-step double-piece structure, pilot diaphragm structure, direct-acting piston structure, step-by-step direct-acting piston structure, pilot piston structure).
Solenoid valves are used in fluid power pneumatic and hydraulic systems, control cylinders, hydraulic drive motors or larger industrial valves. The automatic irrigation sprinkler system also uses solenoid valves and automatic controllers. Washing machines and dishwashers use solenoid valves to control water entering the machine.
Solenoid valves can be used in a wide array of industrial applications, including general on-off control, calibration and test benches, pilot plant control loops, process control systems, and various original equipment manufacturer applications.
Control the opening/closing of the pipeline or changing the flow direction of the fluid (usually compressed air or liquid) by energizing/disconnecting the solenoid coil (solenoid switch valve).
Change parameters such as the voltage/current of the solenoid coil (usually current such as 4-20mA direct current) to control the fluid flow or fluid pressure in the pipeline (electromagnetic regulating valve).
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There is a closed cavity in the solenoid valve with through holes at different positions. Each hole leads to a different oil pipe. In the middle of the cavity is the valve. On both sides are two electromagnets. Where it is attracted, by controlling the movement of the valve body to block or leak out the different drain holes, and the oil inlet hole is normally open, the hydraulic oil will enter the different drain pipes, and then push the oil through the oil pressure The rigid piston, the piston drives the piston rod, and the piston rod drives the mechanical device to move. In this way, the mechanical movement is controlled by controlling the current of the electromagnet
The solenoid valve is the control element, mainly used to control the cylinder. There are also analytical instruments or other spray guns used to directly control the gas. Solenoid valves are divided into two types: pneumatic and hydraulic. The working methods are the same, but the medium is different. The working principle is to open several holes in a valve body, and then use electromagnetic induction to control the movement of the valve stem to control which hole is blocked, or which hole is let out. In order to achieve the purpose of control.
Common uses. Solenoid valves are used in fluid power pneumatic and hydraulic systems, to control cylinders, fluid power motors or larger industrial valves. Automatic irrigation sprinkler systems also use solenoid valves with an automatic controller.