Valve with flexible seat - having undercut groove to form deformable lip to match profile of valve member on closure

摘要

The valve (53) has a flat base (57) which has a cut away neck behind it. The valve seat is made from flexible material and is screwed into the housing or casing at the outside edge which is cylindrical. The valve seat has a flat top face matching the face of the valve (57). The valve seat has a deep circumferential groove (54) below the mating face of the seat to add flexibility. The valve seat will take up the exact profile of the valve when these are in contact.