- for shorter operating times of a cylinder

In many applications, small 2/2 or 3/2-way valves are used to extend and retract cylinders. A practical realization is often as shown in the two figures below.       

The positioning and reset speed depend on the pressure and the smallest cross-section in the line system. With the correct design, the largest bottleneck is the nozzle in the actuating valve, whereby larger nominal widths enable a larger flow rate and higher actuating speeds of a cylinder. However, the nominal diameter of the valve can only be increased to such an extent that the pressure range of the valve is sufficient for the supply pressure of the cylinder.

However, to enable the cylinder to retract more quickly, a quick exhaust valve can also be installed so that the time required to retract the cylinder is no longer determined by the nozzle size of the valve, but by the exhaust capacity of the air vent, which significantly accelerates the positioning speed of a cylinder. In practice, we implement such circuits in the form of individual components (valve and quick air vent separately) or in integrated circuits (valve and air vent in one valve block). The combination of 3/2-way solenoid valve and quick air vent enables a very simple and space- and cost-saving realization. This circuit can also be extended with silencers for sound attenuation.