How does a double pressure valve work and what are the functions of a shuttle valve?

Working principle of double pressure valve



Double-pressure valve is also equivalent to the combined structure of two one-way valves, and its function is equivalent to an "AND gate". It has two input ports P1 and P2 and one output port A. When P1 and P2 have separate inputs, the valve core is pushed to the other side, and A has no output. Only when P1 and P2 have input at the same time, A will have an output. When the air pressures input by P1 and P2 are not equal, the lower air pressure will be output through A. Dual-pressure valveIt is often used as an "AND gate" component in pneumatic circuits.

It has two input ports and one output port. Its function is: only when the two input ports have input at the same time, there will be an output, which is equivalent to an "AND gate" "Logic function.



When both input ports have air signals, the output port will have air output. As long as one of the air signals is not input, the output will stop;when both input ports have air signals, When the air pressure is high, the low pressure side will flow to the output port.



Two two-position three-way valves need to act at the same time to make the single-acting cylinder move forward and realize "AND" gate logic control. Only when both button valves 1S1 and 1S2 are pressed, the single-acting cylinder piston rod extends;if one of the two button valves 1S1 and 1S2 does not move, the cylinder piston rod will retract to the initial position.

What are the functions of double-pressure valves and shuttle valves?



The shuttle valve is equivalent to a combination of two one-way valves, and its function is equivalent to an "OR gate". Its working principle is the same as that of a hydraulic shuttle valve. The shuttle valve has two air inlets P1 and P2 and one outlet A. Both P1 and P2 can communicate with the port, but P1 and P2 do not. Either P1 or P2 has a signal input, and A has an output. If both P1 and P2 have signal input, the air signal from the side added first or the side with high signal pressure will be output through A, and the other side will be blocked. Only when there is no signal input from P1 and P2, A will have no signal output. Shuttle valves are widely used in pneumatic systems. They can input control signals to control actuators in an orderly manner. Shuttle valves are used in common parallel circuits of manual and automatic control.



Double-pressure valve is also equivalent to the combined structure of two one-way valves, and its function is equivalent to an "AND gate". It has two input ports P1 and P2. When there is input alone, the valve core is pushed to the other side, and A has no output. There is output only when P1P2 has input at the same time. When the air pressures input by P1P2 are not equal, the one with lower air pressure will be output. Double-pressure valves are often used as "AND gate" components in pneumatic circuits.