US Patent 10512920 Sanitary insertion unit

A sanitary insertion unit includes an insertion housing in which at least one closing valve having an annular channel is provided. An annular valve body composed of elastic material is arranged in the annular channel, the valve body deforms under the pressure of the incident fluid in such a way that the valve body tightly closes the annular channel. The annular channel of the closing valve has a profile on an inner and outer channel wall. Via the profile, better controllability of the closing valve during the closing process of the valve body of the closing valve can be achieved and disturbing noises and vibrations are effectively avoided.