| 摘要 |
In a metering and spray pump for liquid, low-viscosity and pasty substances, an elastic bellows 3 is arranged between two plastic housing parts 1, 2 that are telescopingly movable relative to one another, connecting them. The bellows, acting as a discharge valve 18, has, at one end, a valve annular wall 15 that surrounds the generated surface 17 of an inner annular discharge seat 8 made in one piece with the first housing part 1 in a sealing manner and such that it can be lifted off. As a suction valve 58, the bellows 3 has, at its other end, a valve annular wall 54 which is in sealing and separable contact with the generated surface 43 of a valve seat 42 made in one piece with the second housing part 2 such that it can be lifted off, and the medium to be pumped is drawn into the bellows 3 through the valve seat. To guarantee high reliability of operation, especially good closing quality at weak valve opening forces, where the quality of closing can be tested even in the dry state, with the smallest possible number of simple and easy-to-assemble individual parts, the valve annular wall 15 of the discharge valve 18 and the valve annular wall 54 of the suction valve 58, which valve annular wall 54 is provided with a closed front wall 57, are each in contact with conical or hemispherical generated surfaces 17, 43, wherein both valve annular walls 15, 54 are connected to the bellows 3 both radially elastically and elastically movably in the axial direction.
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