transmission of hydraulic oil, compressed air and vacuum
coupling against pressure or only depressurised coupling
with or without coupling stroke
Coupling mechanism and coupling nipple are provided with axial seals (see coupling situation). This results in a very short coupling stroke as well as a smooth front face of the coupling mechanism and thereby only little area of attack by dirt and swarf.
The build-in types are designed for mounting in plates and are particularly suitable
for the use in multi-couplings (see data sheet F9.440).
The threaded-body types can be screwed in directly in the fixture body and are therefore optimum line connections between two components as e.g. basic fixture and changing fixture.
The axial forces generated in the coupling situation have to be compensated externally positively or non-positively. According to the version the coupling elements can be coupled and uncoupled against pressure or only in depressurised mode (depending on the sealing material).
The coupling nipple provided with a preloaded valve (VSV) can be installed in the return or unclamping line of a clamping fixture. The valve limits a possible pressure build up in uncoupled (static) condition to approx. 5 bar. In coupled mode the pre-loaded valve is not effective.
The sealing surfaces on the face of the coupling elements have to be cleaned before coupling, to ensure the tightness in coupled condition. We recommend to wash the elements and finally clean them with compressed air. Protection covers should be used as far as possible.
The fixture bodies which are to take up the coupling elements have to be guided 2-3 mm parallel before they are coupled without exceeding the radial positioning tolerance. To transmit compressed air and vacuum use only the coupling elements for “depressurised coupling”.
These automatically closing couplings have a flat surface and do not have protruding elements for sealing. Therefore exact positioning is not required and a radial positioning misalignment of up to 2 mm is admitted. Cleaning of the coupling surfaces is easily possible due to the flat surfaces. Because of the omitted active axial coupling stroke completely new solutions for the coupling motion can be realised .
These patented couplings do not open their check valves as usual by mutual pushing open via the coupling stroke but due to the pressure increase in the hydraulic line. The internal check valves (coupling ram) of both coupling elements are designed as pistons. In depressurised mode they are maintained closed by a pressure spring.
As soon as a pressure is built up in the line, which is higher than the force of the pressure spring, coupling (1) at the pressure generator side will be opened. Now the pressure is also available at the front face of the opposite coupling (2) and opens this coupling correspondingly. The line has free passage to the connected cylinder.
If the line will be relieved from pressure, the couplings close automatically as soon as the pressure drops below the closing pressure.
see PDF data sheets
The multi-coupling is a modification of the threaded coupling elements as per data sheet F 9.430. It is composed by two components, the nipple carrier and the coupling carrier. The advantage of the coupling carrier is the fact that its face is flush in uncoupled condition, thereby it can be easily cleaned by means of the integrated blast air system. With these coupling elements coupling or uncoupling of lines can be effected against system pressure or depressurised. The coupling and nipple carrier can be equipped or retrofitted by an additional line (ND 3) for the passage of air, water or hydraulic oil (single coupling elements see data sheet F 9.428).
Available on request.
Rotary indexing table - clamping fixture, hydraulically operated, with trunnion bearing and hydraulic positioning
Changing fixture with 6 couplings for the
machining of turbine blades
coupling, 2 passages
coupling, 4 passages