Roemheld 2951-416 - User Manual

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
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Fitters and setters of machine tools. They
have to be familiar with the handling and
mounting of hydraulic components.
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.
! 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.
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.
Operating Instructions
Check Valves, Pilot Operated
These operating instructions are
available for pilot-operated check
valves of the following types:
2951-416
2951-417
2951-421
2951-501
Target group of this
document
Provided use
Safety
Troubles of functioning
Protect against swarf, otherwise
check valves might not seal.
Instructions for safe
operation
Function
BA_D8755
Issue 03/2004

Summary

Check Valves, Pilot Operated

Target group of this document

Fitters and setters of machine tools familiar with handling and mounting of hydraulic components.

Provided use

For locking hydraulic cylinders. Not suitable for double-acting swing clamps due to unfavorable surface ratio.

Safety

Protect against swarf for proper sealing. Do not exceed max operating pressure or flow rate.

Function

Spring-loaded ball-type poppet valves. Flow A→B locked, can be hydraulically unlocked by pressurising control port Z.

Installation

Any mounting position. Return leakage port L to reservoir. Specific steps for manifold-mounting type 2951-416.

Hydraulic connection

Connect lines to standards, ensure cleanness. Use specific fittings; avoid sealing tape, copper rings.

Maintenance

Check hydraulic ports for tightness visually. The valve itself is maintenance free.

Data sheets

List of available data sheets for different check valve types, including corresponding document numbers.

Hydraulic Intensifier

Target group of this document

Fitters and setters of machine tools familiar with handling of hydraulic components.

Provided use

Designed for clamping fixtures to increase hydraulic pressure via intensification ratio 'i'.

Instructions for safe operation

Avoid swarf and contamination. Use a 10µ filter. Ensure fixture can compensate high forces.

Function

Increases pressure at input side to a higher pressure based on intensification ratio 'i'.

Troubles of functioning

Leakage during operation means cycling mode is not possible.

Hydraulic connection

Connect lines to standards, ensure cleanness. Use specific fittings; avoid sealing tape, copper rings.

Hydraulic bleeding

Bleed hydraulic lines during start-up to avoid prolonged clamping times and function problems.

Maintenance

Clean/exchange filters regularly. Check hydraulic ports for tightness. Intensifier is maintenance free.

Intensification

Table detailing intensification ratio, flow rates, and operating pressures for various intensifier types.

Trouble shooting

Addresses system pressure reduction and no pressure build-up, suggesting remedies like component exchange.

Data sheets

List of available data sheets for different hydraulic intensifier types, including document number D8.755.

Roemheld 2951-416 Specifications

General

Brand	Roemheld
Model	2951-416
Category	Control Unit
Language	English