We can "improve" the circuit seen in the previous post in the scheme by introducing a command for opening and closing a "memory". If the signals generated by valves V 1 and V 2 are used as control signals for switching a valve V 3 5 / 2 bistable linked to the two cylinder chambers, you get the diagram in figure 5.
Pressing V 2 its signal will toggle the V 3 which connects to drain the left chamber of the cylinder and directs the flow of compressed air to the room right of the stem and resulting in a return gate opening. Even if you release the button, the valve V 3 stays in place keeping the pressure in the cylinder chamber thereby blocking the stem. Instead by pressing the V1 to V3 its signal does switch back room that connects the right to discharge and direct the flow in the left chamber of the cylinder resulting in leakage of the rod and closing the gate.
Wanting now complete the pattern we must remember that the c ircu control (dotted line) must be supplied at low pressure while the power (solid line) at high pressure. To satisfy this condition we have to install a pressure reducer upstream of the valves 3 / 2 in order to bring pressure to values \u200b\u200bcompatible with the control circuit (c p = 2 bar ). By introducing this new component of the circuit diagram is shown in Figure 6.
summarize the FRL group feeding pressure p p = 6 bar the main line that branches from one party to the V3 valve that alternately feeds the two chambers of the cylinder, the other to a pressure that feeds the V1 and V2 with a pressure c p = 2 bar .
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