Hydraulic coupler F9.428 series

On machine tools with pallet changing systems, the coupling elements transfer hydraulic oil or compressed air from the machine table to the hydraulic clamping fixture. Description The coupling mechanism and the coupling nipple are provided with axial seals (see coupling situation) and have a very short coupling stroke. The smooth front face of the coupling mechanism is easy to clean in case of swarf formation. The recessed sealing disk can be easily replaced with the assembly tool if it is damaged. The built-in type is fixed with an intermediate plate and is particularly suitable for multi-couplings (see also data sheet F 9.440). The intermediate plates (location plates or covers) must absorb the axial forces generated by the hydraulic pressure. In case of the threaded-body type, the coupling mechanism is screwed directly into the base plate and the coupling nipple into the clamping fixture. Depending on the sealing, the coupling elements can be coupled either against pressure or only without pressure. Coupling nipple with preloaded valve (VSV) With double-acting cylinders, internal leakage oil from individual clamping or control elements can cause an increase in pressure in the return line when uncoupled, which can cause mal-functions or loss of clamping force. The built-in VSV limits the pressure increase to 5 bar. If the pressure is exceeded, hydraulic oil will leak, which indicates a larger internal leakage.