Thursday, September 3, 2009

Stopping a Cylinder When Pressure is Lost

NL SONI said...
IT IS REQUIRED TO LOCK A VERTICAL SERVO HDRAULIC LINEAR ACTUATOR HANDLING A DEAD WEIGHT WHENEVER A LOSS OF PRESSURISED OIL SUPPLY TO THE ACUATOR. IT SHOULD INSTANTLY STOP AND GET LOCK AT THE SAME POSITION AT THE TIME OF OIL SUPPLY FAILURE.THE OPERATING PRESSURE IS ABOUT 20 BAR TO 100 BAR.KINDLY SUGGEST THE WORKABLE SOLUTION FOR THIS REQUIREMENTS.
August 18, 2009 9:26 PM

3 comments:

JDK said...

There are a few ways to do this and probably a best way with more information. 2 options:
1. Use an externally piloted check valve. Drain the pilot to tank when a loss of pressure is sensed. Caution here - based on the weight and speed, a pressure spike will occur.
2. Use a Counterbalance Valve to resist movement. This will cushion then stop but take more time.

"Instantly Stopped vs Workable Solution" depending on the weight and speed may not be possible.

pnachtwey said...

A lot depends on the source of the pilot pressure than the valve. The source of pilot pressure should not trigger the opening and closing of the valve during normal operation because it will interfere with the servo control.

JDK said...

The source/drain of the pilot pressure on the check valve would be controlled by an electrical 2 position solenoid valve. This is done in steel mill applications quite often.