Recommendations and Specifications for hydraulic equipment and facilities
Recommendations & Specifications
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Description
| General | ||
| Specifications | In accordance with VDI 3267 to 3284 | |
| Terms and symbols |
In accordance with DIN ISO 1219 | |
| Units | SI-units as per ISO 1000 | |
| Dimensions without tolerances |
DIN 7168-m | |
| Connection thread | Whitworth®British standard pipe thread, type X as DIN 3852, data sheet 2, (for cylindrical screwed plugs). | |
| Fittings | As per DIN 2353, screwed plugs type B as per DIN 3852, sealing by knife edge or elastic-sealing. Do not use additional sealing materials (e.g. Teflon ribbon) or tapered connection thread (e.g. NPT-thread). |
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| Recommended oils | Oil temperature °C 10 - 40 15 - 50 20 - 60 |
Designation as per DIN 51524 HLP 22 HLP 32 HLP 46 |
| Sealing material | - NBR (Acrylnitril-Butadien-Caoutchouc, e.g. Perbunan®), - FKM (Fluorine-Caoutchouc, e.g. VITON®), - PTFE (alone or with additional materials), PU, special materials in accordance with function requirements |
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| Clamping Elements | ||
| Mounting position | Any, if not otherwise stated | |
| Operating pressure | see product-specific data sheet | |
| Ambient temperature | -10 °C up to +60 °C | |
| Piston transverse forces | max. 5% of the nominal piston force | |
| Admissible piston stroke speed | max. 0,25 m/s (attention to product-specific data sheet indications) | |
| Operating method | - single-acting, without or with spring reset of the piston (Reset times cannot be defined) - double-acting |
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| Temperature influence | All media expand differently when temperatures rise. The hydraulic oil also tries to expand. Similarly a fall in temperature leads to a decrease in pressure. Generally one can assume that change of 1°C alters the pres-sure by approx. 10 bar. For that reason fixtures that are uncoupled from the power unit should be equipped with a pressure accumulator in order to reduce the influence of temperature. | |
| Lifetime | In the case of single-acting cylinders with spring reset, it is essential to prevent the ingress of fluids and dirt particles into the spring chamber | |
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Accident |
Always comply with the applicable accident prevention regulations. In particular avoid risks of trapping or squashing fingers etc. During strokes of the cylinder (DIN 31001, section 1). | |
| Commissioning & Maintenance |
Take care to ensure scrupulous cleanliness when assembling hydraulic components. Use only clean, specified pressure medium. Bleed the hydraulic system before putting into operation. Adhere to the manufacturer’s instructions and maintenance intervals. |
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| Rotary Couplings | ||
| Installation conditions | Rotary couplings may be fixed (screwed) only on one side. The opposite side may be secured against twisting. It is to be avoided that no bending moment is effected on the standing or rotating element. Only the firmly bolted side may be piped. The other side should be supplied with pressurized oil via flexible hoses only. | |
| Operating pressure, Ambient temperature, Max. rotary speed |
For these data refer to the relevant data sheet and/or the respective built-in drawing. | |
| Commissioning & Maintenance |
Take care to ensure scrupulous cleanliness when assembling hydraulic components. Use only clean, specified pressure mediums. Bleed the hydraulic system before putting into operation. Rotary couplings are not subject to regular maintenance intervals. |
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