Sequence Valves ND 5

with adjustable switching time
max. operating pressure 250 bar

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Operating instructions

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Information Series

Description

C 2.9546 Sequence valves

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

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.

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.

Products (2)

Number

Item no.	CAD data	type	type	max. operating pressure [bar]	type
Item no. 2954620	CAD data	type sequence valve	type manifold-mounting type	max. operating pressure [bar] 250	type poppet valve	Properties
Item no. 2954630	CAD data	type sequence valve	type manifold-mounting type	max. operating pressure [bar] 250	type poppet valve	Properties

Accessories (6)

Number

Item no.	CAD data	Description
Item no. 3000342	CAD data	Description O-ring 7 x 1.5 mm, NBR as per data sheet B1.5091
Item no. 3302076	CAD data /	Description Socket head cap screw M5 x 50 mm - DIN 912-8.8 as per data sheet B1.486
Item no. 3534475	CAD data	Description Mounting plate G1/4 for sequence valves 2954620 and 2954630 max. 250 bar, as per data sheet C2.9546
Item no. 3815059	CAD data /	Description Orifice check valve for sequence valve 2954630 as per data sheet C2.9546
Item no. 3815065	CAD data /	Description Orifice check valve for sequence valve 2954620 as per data sheet C2.9546
Item no. 3887143	CAD data /	Description Plug-in filter for sequence valves 2954620 and 2954630 as per data sheet C2.9546

Application examples

Sequence valves C 2.9546 for time-dependent sequence control

Clamping sequence

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 almost 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.