Roemheld 2951-416 Operating Instructions

Check Valves, Pilot Operated
Target group of this
document
Fitters and setters of machine tools. They
have to be familiar with the handling and
mounting of hydraulic components.
Provided Use
Locking of leakage-free hydraulic
cylinders, i. e. for maintaining the
pressure and/or the position, can also be
used in combination with non-leakage
free directional control valves.
Pilot-operated check valves are not
suitable for locking of double-acting swing
clamps (pull-type cylinders). Due to the
unfavourable surface ratio of these
elements, the control pressure is not
sufficient for unlocking and dangerous
pressure intensifications occur. For such
applications use type 2951-421.
Römheld GmbH · Postfach 12 53 · D-35317 Laubach · Phone + 49 (0) 64 05 / 89-0 · Fax +49 (0) 64 05 / 89-211 · www.roemheld.com
Operating Instructions

Safety

Troubles Of Functioning
Protect against swarf, otherwise
check valves might not seal.
Instructions for safe
operation
! Swarf or contamination in the hydraulic
oil lead to increased wear or damage at
the guides, running surfaces and seals.
! The maximum operating pressure and
the admissible flow rate of the valve
must not be exceeded.
! Use hydraulic oil as per Roemheld data
sheet A 0.100.
Issue 03/2004
BA_D8755
These operating instructions are
available for pilot-operated check
valves of the following types:
2951-416
2951-417
2951-421
2951-501
Function
Check valves are spring-loaded ball-type
poppet valves (leakage free).
→
The flow B A is free. The flow from A
B is locked, but it can be hydraulically
unlocked by pressurising control port Z.
→
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