Reciprocating machine such as membrane pump or piston compressor

摘要

The valve disc (12) of the pressure side and/or of the suction side valve (10), has at least one capillary channel (19) as pressure unloading connection. The capillary channel has an internal diameter dependent upon the thickness of the elastic valve disc in the sense of a diameter enlargement with increasing thickness of the valve disc. This internal diameter of the capillary channel is from 0.2 to 0.5 mm. In the area between the valve seat and the valve disc a capillary by-pass channel is provided, which at least connects a valve throughflow aperture (15) with the opening of the capillary channel in the valve disc facing the valve seat. Instead of elastic valve discs, valve tongues may alternatively be provided.