You can regulate the supply and discharge of compressed air in your pneumatic system by means of flow control valves. This group of valves includes the throttle valve, the throttle check valve, the quick exhaust valve and the logic valve.
With a throttle valve, the throttle cross-section is increased or reduced via an adjusting screw depending on the requirements. The volume flow increases or decreases. With a throttle valve, however, the compressed air can flow in both directions. A classic application is the adjustment of the speed of movement of the piston in a pneumatic cylinder.
Quick exhaust valve
A quick exhaust valve guarantees a quick exhaust of the pneumatic system without going through the normal return lines. Pneumatic cylinders, for example, can be vented more quickly and are ready for the next work cycle more quickly. During the working stroke, the air flows from the supply port through the working port into the pneumatic cylinder. During the return stroke, the air flow automatically switches the valve and can flow out quickly through the venting connection, which has a much larger cross-section.
A logic valve has two inputs and one output. They are used for the logical interconnection of several pneumatic signals and thus for control. The Oder valve, also called shuttle valve, automatically connects the input, where the higher pressure is applied, with the output. The second input is automatically blocked. An AND-valve, also known as a two pressure valve, closes the outlet if there is no pressure at one of the two supply ports. Air only escapes from the outlet if the set minimum pressure is present at both ports.