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Pilot operated check valves

Valves to block the flow and hydraulic unblocking

without and with pre-release

port size: ø5 mm .. G 1/2
control volume: 0.15 .. 0.4 cm³
max. flow rate: 15 .. 55 l/min
max. operating pressure: 500 bar

Series Data sheet Technical data
C2.9511
C2.9511
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C2.9511 Pilot-operated check valves

 

without/with pre-release

pipe-thread type

max. operating pressure 500 bar

connections: G1/4 .. G 1/2
control port: G 1/4
control volume: 0.15 .. 0.4 cm³
max. flow rate: 15 .. 55 l/min

C2.9512
C2.9512
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C2.9512 Pilot-operated check valves

 

without/with pre-release

manifold-mounting type

max. operating pressure 500 bar

connecting bore holes: ø5 .. ø9 mm
control port: ø3.5 mm
leakage port: ø3.5 mm
control volume: 0.2 .. 0.5 cm³
max. flow rate: 20 .. 50 l/min

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figure 1: pipe-thread type C2.9511
 
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figure 2: manifold-mounting type C2.9512
 

Pilot-operated check valves C 2.9511 and C 2.9512 (figure 1 - 2)

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.

 
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figure 1: application example with pipe-thread type C2.9511
 
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figure 2: application example with manifold-mounting type C2.9512
 

Application example 1 (figure 1)
pipe-thread type C2.9511

 

 

 

 

 

 

 

Application example 2 (figure 2)
manifold-mounting type C2.9512