Bellows pump for paste and liquid substances has each connecting section at suction and delivery end consisting of outer annular wall radially enclosing inner annular wall to form annular slot

摘要

The bellows pump comprises an elastic, axially, spring-compressible bellows (2) with at least one fold and with a ring type connecting section (13,14) at each end through which the housing (1) of a suction valve (15) at one end and the housing (3) of a delivery valve (16) at the other end can be attached. Each connecting section consists of an outer annular wall radially enclosing an inner annular wall to form an annular slot and protruding axially outwards. The outer annular wall has on the inside a radial annular shoulder which at least partially overlaps the annular slot with an axial clearance.