Sequence valves

Valves for pressure or time-dependent sequence control

with check valve

Series  (2)

Items  (8)

  1. with check valve – adjustment range: 10 to 75 bar – max. 500 bar, as per data sheet C2.954
  2. check valve – adjustment range: 10 to 75 bar – max. 500 bar, as per data sheet C2.954
  3. with check valve – adjustment range: 10 to 150 bar – max. 500 bar, as per data sheet C2.954
  4. check valve – adjustment range: 10 to 150 bar – max. 500 bar, as per data sheet C2.954
  5. with check valve – adjustment range: 10 to 450 bar – max. 500 bar, as per data sheet C2.954
  6. check valve – adjustment range: 10 to 450 bar – max. 500 bar, as per data sheet C2.954
  7. with adjustable switching time – possible switching times: 0.9 to 45 s – min./max. operating pressure: 40/250 bar – as per data sheet C2.9546
  8. with adjustable switching time – possible switching times: 0.5 to 18 s – min./max. operating pressure: 40/250 bar – as per data sheet C2.9546

Description

Sequence valves C2.954

for pressure-dependent sequence control
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 valve C2.954 with pipe thread G1/4
sequence valve C2.954 with manifold-mounting connection
sequence valve battery C2.954

Sequence valves C2.9546

with adjustable switching time

Application
This sequence valve is used in hydraulic fixtures to operate individual clamping cylinders or entire subassemblies with an adjustable time delay.

 

Description
Normal sequence valves open without delay, if the adjusted switching pressure is exceeded.
Sometimes it is necessary to slow down the switching sequence for functional reasons. For this reason, this sequence valve does not open pressure-dependently, but by the adjustable stroke of a control piston.

 

Function
A poppet valve is built into the housing, which can be opened by the hydraulically-operated control piston.
When pressure is applied to port P, hydraulic oil flows through an orifice check valve to the control piston. Since the piston stroke is relatively long, it takes a few seconds for the control piston to open the poppet valve. The delay time depends on the piston stroke, which is limited by the adjusting screw.

Sequence valve C 2.9546 with adjustable switching time

PDF Data sheets

Application examples

Sequence valves C 2.954 for pressure-dependent sequence control

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.
application example with sequence valve C2.954

Sequence valves C 2.954 for pressure-dependent sequence control

Hydraulic circuit diagram for a sequence control of 5 single-acting clamping cylinders.

hydraulic circuit diagram for pressure-dependent sequence control with sequence valves C2.954

Sequence valves C 2.9546 for time-dependent sequence control

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

sequence valve C2.9546 for time-dependent sequence control