Sequence valves

Valves for pressure or time-dependent sequence control

with check valve

port size: ND 4 /G1/4
adjustment range: 10..75 / 10..150 / 100..450 bar or 1..10 s
max. flow rate: 8 l/min
max. operating pressure: 250 / 500 bar

Series Data sheet Technical data
C2.9545 Sequence valves ND 4


with check valve

max. operating pressure 500 bar

port size: G 1/4
adjustment ranges: 10..75 / 10..150 / 100..450 bar
max. flow rate: 8 l/min

C2.9545 Sequence valves ND 5


with time-dependent switching sequence

max. operating pressure 250 bar

port size: ND5
adjustment range: 1 .. 10 s
max. flow rate: 8 l/min
min. operating pressure: 30 bar

figure 1: sequence valve C2.954 with pipe thread G1/4
figure 2: sequence valve C2.954 with manifold-mounting connection
figure 3: sequence valve battery C2.954
figure 4: sequence valve C2.9545

Sequence valves C2.954
for pressure-dependent sequence control (figure 1 - 3)
Sequence valves are used in power workholding circuits for pressure-dependent sequence control. The compact size allows mounting directly to the fixture, requiring only one pressure line from the power unit to the fixture for single-acting cylinders.
The sequence valves are available with pipe thread G1/4 or manifold-mounting connection for drilled channels.

Several sequence valves can be manifold mounted together to form a battery with only one common P-line.

Sequence valves C2.954
for time-dependent sequence control (figure 4)

The adjustable switching delay allows a time-dependent switching sequence of hydraulic elements within a hydraulic circuit, independent of the hydraulic pressure. On principle the valve has to be preadjusted to the hydraulic conditions with reference to pressure, viscosity and temperature. Parallel or series connection of several valves is possible. The compact design facilitates the installation directly at the clamping fixture.

The valve consists of a base body with an integrated hydraulic piston that operates the opening valve. For adjustment of the time-dependent sequence control there are two possibilities. A throttle screw is used for the rough adjustment of the response time according to the adjusted system pressure. With an adjusting screw mounted on the face the precise adjustment of the delay time is effected.
As soon as there is oil pressure at input port P, the internal piston realises a determined stroke and opens mechanically the installed opening valve. Now the flow rate is available at output port A for the hydraulic element.

figure 1: mounting plate for pipe thread G1/4

Mounting plate for pipe thread G1/4 (figure 1)
for sequence valve C2.9545
data sheet C2.9545

figure 1: application example with sequence valve C2.954
figure 2: hydraulic circuit diagram for pressure-dependent sequence control with sequence valves C2.954
figure 3: sequence valve C2.9545 for time-dependent sequence control

Sequence valves C 2.954 for pressure-dependent sequence control (figure 1)
The workpiece is to be positioned and clamped in the fixture with hydraulic clamping cylinders.

Clamping cycle

  • Cylinder 1 pushes workpiece against stop a.
  • Pressure rises to 30 bar, sequence valve opens.
  • Cylinders 2 and 3 extend and push the workpiece against stop b and c.
  • Oil pressure rises uniformly in all cylinders, because of the throttle-free passage of the opened sequence valve.


Sequence valves C 2.954 for pressure-dependent sequence control (figure 2)
Hydraulic circuit diagram for a sequence control of 5 single-acting clamping cylinders.



Sequence valves C 2.9545 for time-dependent sequence control (figure 3)

  • Cylinder 1 moves without pressure against the stop.
  • Oil pressure increases up to 160 bar.
  • After the adjusted switching time the sequence valve opens and cylinder 2 moves without pressure against the stop. In the process, cylinder 1 becomes again nearly pressureless.
  • The oil pressure at both cylinders increases up to 160 bar.