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Reversing directional control valve classification and working principle
Reversing directional control valve (referred to as the valve), is through the change of gas flow and gas flow direction changes, so as to achieve the purpose of changing the direction of movement of pneumatic actuators. It includes pneumatic control valve, electromagnetic control valve, mechanical control valve, manual control valve and time control valve. 1, the pressure control valve pneumatic control valve, is the use of gas pressure to move the main valve so that the gas flow to change. According to different control methods are divided into pressure control, pressure relief control and pressure control of three. Pressure control refers to the control signal applied pressure is gradually increased. When the pressure increases to the spool of the operating pressure, the main valve will be commutated; relief control refers to the added pressure control signal is reduced, when reduced to a certain pressure value, the main valve commutation; poor Pressure control is the main spool in the pressure difference between the two ends of the commutation. Pneumatic control valve by the main valve structure is different, but also can be divided into two kinds of main forms of cut-off and spool valve. Sliding valve pneumatic control valve structure and working principle and hydraulic valve is basically the same. This mainly describes the cut-off valve. Cut-off valve works Figure 1 shows the two three-way single-ended cut-off valve working principle diagram. Figure 14-20a shows the status of the control port when there is no control signal. Valve in the spring and P cavity under pressure, so that P and A disconnect, A and T pass, the valve is in the exhaust state. When K port has control signal (see Figure 14-20b), P and A pass, A and 2, disconnect, port A inlet. Figure 1, the working principle of the cut-off valve Figure 2 shows the two-way three-way single-ended cut-off valve structure. When K mouth no signal. A and T pass, the valve is in exhaust state; when K port has signal input, the compressed air enters the end of the piston 9, so that the valve stem 5 moves left, P and A pass. The figure shows the normally-off valve, if P and T for the exchange then become a common type. Figure 2, the structure of the cut-off valve 2, Pilot solenoid valve Figure 3, the working principle of direct-acting single solenoid valve Pilot solenoid valve is controlled by the solenoid first pneumatic circuit to produce a pilot Pressure, and then by the pilot pressure to promote the main valve spool, to commutate. For larger diameter occasions. Figure 4 shows the pilot-type two-way two-way electromagnetic reversing valve. It consists of pilot valve (Dl, D2) and the main valve. The main valve and valve body 1 and piston assembly 2 includes two parts. Pictured is Dl, D2 are in a power-off state. Solenoid valve moving iron core 5,6 is closed. When Dl is energized, when D2 is deenergized, the moving core 5 is sucked up and the compressed air from port P enters the f cavity of the valve via hole a (dotted line). And enter the hole 'from the lip around the sealing plug 4 (one-way valve) and enter. Wide cavity, push the piston assembly 2 down, so that P and A pass, B through the center hole h and T spool (exhaust). A port of compressed air output at the same time, there is a part of the compressed air into the hole g, one of the way through the orifice d into the cavity c so that the sealing plug 4 down to seal the vent b, the other way into the f cavity f, role in The upper end of the piston assembly 2. At this time, even if D1 is de-energized, the piston assembly 2 does not have a bit that the valve has a memory function. When the Dl power off, the moving core 6 is sucked up, c cavity compressed air discharged through the T1 port. In this case, the compressed air from P to A acts on the large and small pistons, and the upward force is generated due to the area difference between the large and small pistons, so that the piston assembly 2 moves upward. At the same time, the sealing plug 4 also moves upward and opens the valve port 3 so that the compressed air at the upper end of the piston assembly 2 is drained through the hole 6. Piston assembly 2 moves up, P and B pass, A and T pass (exhaust). At this moment, even if the D2 is powered off, the force generated upward due to the difference of the sizes of the pistons still exists, so the output state will not change, that is, it has the memory function. Pneumatic solenoid valve and hydraulic solenoid valve, there are many types, its working principle is similar, not repeat them.