Program summary Block Cylinders - Römheld GmbH Friedrichshütte - #4

High alloy steel, bronze alloy and special aluminium alloys.

Case-hardening steel, hardened Exceptions:

- B 1.542: high alloy steel, nitrated

- B 1.590: high alloy steel, chromium-plated Block cylinders with aluminium or bronze bodies are alternatively also equipped with pistons made of stainless steel.

• NBR = nitrile-butadiene rubber Trade name e.g.: Perbunan Operating temperature: -30 up to +100°C

• FKM = fluor caoutchouc

Trade name e.g.: VITON®

Operating temperature: -20 up to +150°C

All block cylinders can be installed in any position.

Fittings suitable for the Whitworth G tube thread correspond to DIN 2353, screwed plug type B according to DIN 3852 sheet 2 (with sealing edge or soft seal). For block cylinders with aluminium or bronze housing only fittings with soft seal (elastic seals) must be used. Important! No additional sealing materials, such as Teflon ribbon, must be used!

Side loads stress the guides for the piston and piston rod of the cylinder and thereby cause a reduction in working life and leakages leading to the destruction of the cylinder. For this reason, side loads should be avoided - especially with single-acting cylinders. Under no circumstances must the cylinder side load exceed 3% of the cylinder force at maximum operating pressure (up to stroke of 50 mm). In the case of longer strokes please contact us.

Side load

In principle, screws of tensile strength 8.8 can be used to secure the block cylinders. If block cylinders are fastened with screws across the cylinder axis, they must be suppor­ted above a specific operating pressure. Block cylinders: from 160 / 250 bar

Hydraulic block cylinders: from 100 / 160 bar (Use as push cylinder / pull cylinder)

Support

The support only has to be a few millimetres

high.

ROEMHELD block cylinders do not leak oil when static. When displacing the piston a sealing with minimum leakage is obtained by the double piston sealing. For the life of the sealing dry operation has to be avoided, so that a residual lubricating film will be tolerated. Admissible guide values for 1000 double stro­kes and hydraulic oil HLP 22 are:

- up to 32 mm piston diameter: < 0.30 cm³

- from 40 mm piston diameter: < 0.60 cm³

A distance bushing is inserted on the piston rod side in the block cylinder with the next largest stroke and fastened inside the housing. That means the piston can no longer complete the extending stroke and the stroke is restricted by this internal stop, dependent on the length of the bushing.

Distance bushing

As accessory different contact bolts and coupling pins are available. See data sheet G 3.800

For mounting of the block cylinders internal threads can be provided instead of the through holes, optionally at the piston rod side or the bottom side.

If there is a possibility that aggressive cutting lubricants and coolants penetrate through the sintered metal air filter into the cylinder's inte­rior, a vent hose has to be connected and be placed in a protected position. For further notes and provisions see data

sheet A 0.100.

Internal thread-

As accessory for block cylinders with an external thread at the piston rod (data sheet B 1.542) spherical bearings are available. Bearing blocks are available for fixing at the cylinder bottom. Rod end bearings can be screwed and fixed onto the piston rod.

As an alternative to a support, hydraulic block cylinders can be fitted in the housing with a keyway, which transfers the cylinder forces to the baseplate surface via a key.

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Römheld GmbH

Friedrichshütte

Römheldstraße 1-5 35321 Laubach, Germany Tel.: +49 (0) 6405/89-0 Fax: +49 (0) 6405/89-211 E-mail: info@roemheld.de www.roemheld.com

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