18: VALVES & REGULATORS 216-535-4848
Double Solenoid 4/2 Valves
These cylinders retract in a chosen position. This cylinder becomes totally pressure free.
Single Solenoid 4/2 and 3/2 Valves Single Solenoid Double 3/2 NC + NC Single Solenoid Double 3/2 NC + NC
Dual P.O. Check Valve Module This cylinder is blocked in position, even during its stroke These cylinders maintain their last position and action in case of electrical cutoff.
Designers of electro-pneumatic machines have to define the cylinder positioning when electrical supply gets cut off; for example, for an emergency requirement. A clamping cylinder will maintain its action so that the part it is holding does not take off under the action of a cutting tool. On the contrary, a stamping cylinder will retract in its initial position, and a transfer cylinder may be blocked along its stroke. Pneumatic valve islands provide all means to obtain emergency machine positioning. The different solutions are presented on the valve island above. A , B and C double-acting cylinders are controlled with double solenoid valves. These will keep their position in case of electrical cutoff. The cylinders will maintain their positions and actions.
Single / Double Solenoid Valve Choice for Adequate Emergency Positioning
D and E double-acting cylinders are controlled with single solenoid valves. Their spring return will bring them back in the initial position corresponding to the required initial position of the cylinder. F , G , and H single-acting cylinders will retract as well with the help of their spring. Controlled with a single solenoid double 3/2 NC+NC valve, the double-acting J cylinder will be exhausted on both chambers when an electrical cutoff happens. Due to the Double P.O. check valve module, the double-acting K cylinder will be blocked along its stroke. Valve islands now offer many means to do so with single and double solenoid valves, peripheral modules, integrated dump valves, etc. Pneumatic cylinder / valve circuit design must take into account the machine positioning in case of electrical supply cutoff or other emergency events.
Valve Islands and Emergency Machine Positioning
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