Transcription of CONTROLLING OF PNEUMATIC CYLINDERS
1 CONTROLLING OF PNEUMATIC CYLINDERSP neumatic CYLINDERS can be controlled by the following control of Single or Double acting Control of cylinder with Single Piloted Final Control Control of cylinder with Double Piloted Final Control ValveIn the indirect control actuation, a pilot signal from a 3/2 valve is used toactivate pilot ports of final control Direct Control of Single acting Direct Control of SingleActing CylinderPneumatic CYLINDERS can be directly actuated by actuation of final control valve, manuallyor electrically in small CYLINDERS as well as CYLINDERS which operates at low speeds wherethe flow rate requirements are less. When the directional controlvalve is actuated bypush button, the valve switches over to the open position, communicating working sourceto the cylinder volume.
2 This results in the forward motion of the piston. When the pushbutton is released, the reset spring of the valve restoresthe valve to the initial position[closed]. The cylinder space is connected to exhaust port there by piston retracts eitherdue to spring or supply pressure applied from the other Indirect Control of Single acting : Indirect Control of Single and Double acting CylindersLarge CYLINDERS as well as CYLINDERS operating at high speed are generally actuatedindirectly as the final control valve is required to handle large quantity of air. In the caseof pilotoperated valves, a signal input valve [3/2 way type, 1S1] either actuatedmanually or mechanically is used to generate the pilot signal for the final control signal pressure required can be around bar.
3 The working pressure passingthrough the final control valve depends on the force requirement [4-6 bar]. Indirectcontrol as permits processing of input piloted valves are rarely used in applications where the piston has t o retractimmediately on taking out the set pilot for large single acting Use Double Piloted ValveDouble piloted valve [Fig ] is also called as the Memory valveWith the actuation of Forward push button, the out put signal activates the set pilot port[14]of final control valve. This results forward motion of the cylinderNow even if this push button is released the final control valve remains in the actuatedstatus as the both the pilot ports are exposed to the atmosphere pressure and the pistonremains in the forward end Use of Double Piloted ValveIn order to retract the cylinder , the Return push button is activated.
4 This will convey resetsignal from signal source to the pilot port of final control valve [12] . The piston even if the Return push button is released the status of the cylinder will not change.
