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Rod lock cylinders offer fail-safe functionality

25 April 2015

Parker has introduced the P1D-H rod lock pneumatic cylinder for safety critical applications. P1D-H cylinders are designed to hold loads safely in position even if the compressed air supply fails.

Available in bore sizes from 32 to 125mm, the P1D-H range offers a separate rod lock unit flange mounted to the front end cover of the cylinder. The locking force is provided by the cartridge (through which the piston rod passes), which is mounted transversally in the rod lock unit. When there is no signal pressure, the force from the internal springs pushes the ‘over-the-centre’ mechanism to lock the piston rod using jaw clamps.

It is important that the piston rod has come to a complete standstill before the rod lock is activated to avoid damaging the sharp edge of the jaws. Similarly, the lock should be fully released before the piston rod starts to move again. This can be achieved by exhausting the signal pressure of the rod lock.

The Parker P1D-H is designed for dry piston rod applications. Any grease, lubricant or coolant liquids will only serve to reduce performance. It should also be noted, that a P1D rod lock cylinder must not be used as the only safety component in any application.

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