パイロットチェック弁

Pilot-operated check valves are spring-loaded poppet valves with free flow from B to A and blocked flow in the opposite direction that can be “unblocked” by pressurising the control port Z. The minimum pressure required for unblocking depends on the height of the counter pressure at port A.

In the version with pre-release first a smaller poppet valve located in the main valve piston is opened.

This offers the following advantages:

• The control pressure required for opening is considerably lower, and thereby the  use of swing clamps with unfavourable surface ratios is possible.
• Pressure reduction is effected relatively softly. That saves all hydraulics components and the noise level sinks.