Pilot operated check valves

Valves to block the flow and hydraulic unblocking

without and with pre-release

Series  (2)

Items  (6)

  1. manifold-mounting type – without pre-release, max. 20 l/min – max. 500 bar, as per data sheet C2.9512
  2. without pre-release, max. 15 l/min – max. 500 bar, as per data sheet C2.9511
  3. manifold-mounting type – without pre-release, max. 50 l/min – max. 500 bar, as per data sheet C2.9512
  4. manifold-mounting type – with pre-release, max. 50 l/min – max. 500 bar, as per data sheet C2.9512
  5. with pre-release, max. 55 l/min – max. 500 bar, as per data sheet C2.9511
  6. without pre-release, max. 55 l/min – max. 500 bar, as per data sheet C2.9511

Description

Pilot-operated check valves C 2.9511 and C 2.9512

General information
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 pressurizing the control port Z. The minimum pressure required for unblocking depends on the height of the counter pressure at port A (see diagram).
In the pilot-operated version fist 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.


Application
Blocking of leakage-free cylinders combined with non leakage-free directional control valves and pressure maintenance on uncoupled parts of the installation (clamping pallets).

Important notes!
In the case of swing clamps and pull-type cylinders, a dangerous pressure intensification can occur during unclamping, if the release pressure is not sufficient for opening.
Therefore pilot-operated check valves must be used, that require a substantially lower opening pressure.

pipe-thread type C2.9511
manifold-mounting type C2.9512

PDF Data sheets

PDF

Pilot-operated check valves without/with pre-release – pipe-thread type – max. operating pressure 500 bar

Catalogue sheet C2.9511
PDF

Pilot-operated check valves without/with pre-release – manifold-mounting type – max. operating pressure 500 bar

Catalogue sheet C2.9512

Application examples

Application example 1

pipe-thread type C2.9511

application example with pipe-thread type C2.9511

Application example 2

manifold-mounting type C2.9512

application example with manifold-mounting type C2.9512