| 摘要 |
A pump chamber priming arrangement for a precompression pump sprayer wherein a fixed priming ramp which may be molded in the pump housing extends toward an end of the discharge valve member in the path of reciprocation thereof such that, at or near the end of the piston downstroke, the lower end of the valve member is deflected to one side of the ramp. The valve member, in the form of a poppet valve normally coaxial with the piston and cylinder, has a conical nose portion in sealing engagement with a discharge valve seat formed in the piston. When deflected, the poppet cocks to one side so as to disrupt the discharge valve seal to allow air to escape from the pump chamber to atmosphere via the discharge orifice to thereby provide means for priming the pump chamber in a simple yet highly efficient and economical manner.
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