CML WH42-G02-B3-D24-N WE42 B2 B11B B8 D2 A110 A220 A240 WH42-G02-B3-D24-N Directional Valve

CML solenoid valve WH42-G02-B2A-A220-20 is a step by step direct action type, which can complete the electromagnetic control at the same time, and can have a greater impact on the overall working state of the pipeline. Moreover, the use of vacuum solenoid valve can effectively prevent the impact of other irrelevant elements on the pipeline, so as to make the correct working state of the pipeline. When the vacuum solenoid valve is installed on the mechanical vacuum pump, the valve and the pump are connected to the same power supply, and the opening and closing of the pump directly control the opening and closing of the valve. When the pump stops working or the power supply suddenly becomes intertwined, the valve can automatically fill the vacuum * * * and the air inlet passing through the pump into the pump chamber to prevent the pump oil from flowing back to pollute the vacuum. Looking at the external solenoid valves, up to now, they can be divided into three categories, namely, direct action type, recoil type and pilot type, while from the differences in valve flap structure, data and principle, the reverse type can be divided into: diaphragm type recoil solenoid valve and type recoil solenoid valve; The pilot type can also be divided into: pilot type diaphragm solenoid valve, pilot type solenoid valve; From the valve seat and sealing data, it can also be divided into soft sealing solenoid valve, rigid sealing solenoid valve and semi rigid sealing solenoid valve. 1、 Principle of direct acting solenoid valve: when the normally closed direct acting solenoid valve is energized, the solenoid coil generates electromagnetic attraction to lift the valve core, so that the closing part can be turned away from the remote opening valve seat sealing pair; When the power is cut off, the electromagnetic force disappears, and the valve is closed by pressing the closing element on the valve seat with spring force. (The normally open type is the opposite) Characteristics: it can work normally under vacuum, negative pressure and zero differential pressure. It can be installed arbitrarily below dn50, but the electromagnetic head has a large volume. For example, the direct acting solenoid valve imported from heri0n can be used for 1.33>10-4mpa vacuum

Principle of recoil solenoid valve: its principle is that the direct action and pilot phase are different. When the solenoid valve is energized, the auxiliary valve is turned over first. The pressure of the lower chamber of the main valve is greater than the pressure of the upper chamber, and the valve is opened by the simultaneous action of differential pressure and solenoid valve; In case of power failure, the auxiliary valve shall push the closing part with spring force or medium pressure, and move it downward to close the valve. Features: It can also work under zero differential pressure or high pressure, but the power and volume are large, so the device is required. 3、 Principle of pilot operated solenoid valve: when the pilot valve is energized, the solenoid force drives the pilot valve to open the pilot valve, the pressure in the upper chamber of the main valve drops rapidly, forming a pressure difference between the upper chamber and the lower chamber of the main valve, and relying on the medium pressure to promote the closure of the main valve to move up, the valve opens; When the power is cut off, the pilot valve is closed by the spring force, and the inlet medium pressure quickly enters the upper chamber of the main valve through the pilot hole to form a differential pressure, thus closing the main valve. Features: small size, low power, but the medium pressure difference is limited, and the pressure difference condition is necessary. The two position three-way solenoid valve is usually used together with the single acting pneumatic actuator. The two positions are controllable: open close. The three-way valve has three channels for ventilation. Under normal conditions, one channel is connected with the air source, the other two channels are connected with the air inlet of the actuator, and the other one is connected with the exhaust port of the actuator. The detailed working principle can refer to the working principle diagram of the single acting pneumatic actuator. The two position five way solenoid valve is usually used together with the double acting pneumatic actuator. The two position five way solenoid valve is controllable: open close. The five way solenoid valve has five channels for ventilation, one of which is connected with the air source, two of which are connected with the air inlet and outlet of the external air chamber of the double acting cylinder, and two of which are connected with the air inlet and outlet of the partial air chamber. The detailed working principle can be referred to the working principle of the double acting pneumatic actuator in terms of the air circuit (or liquid circuit), The two position three-way solenoid valve has one air inlet (connected to the air supply), one air outlet (to provide the air supply for the target equipment) and one air outlet