| 摘要 |
<p>Suction and/or discharge valves are provided in a metering and spray pump for liquid or low-viscosity, especially pasty substances, in which two housing parts, which are telescopingly movable relative to one another and are made of a dimensionally stable plastic, have a pump chamber, whose volume can be cyclically altered by a pump member. To provide a valve which can be used both as a suction valve and as a discharge valve and consists of the simplest possible functional parts that can easily be assembled and operate reliably even in the case of relatively wide dimensional tolerances, and which especially has a good quality of closing at low opening force, which can be tested even in the dry state, e.g., on an automatic assembly machine, a valve annular wall 54, which is, with its open edge 55, radially in elastic contact with a conical or hemispherical generated surface 43, is provided with a closed front wall 57 and forms the valve seat, and is connected, elastically movably in the axial direction, to the pump member or to the housing part with which the generated surface 43 is made in one piece.</p> |
