RECIPROCATING PUMP AND CHECK VALVE
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United States of America Patent
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N/A
Issued Date -
Apr 21, 2011
app pub date -
Oct 8, 2010
filing date -
Oct 16, 2009
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A reciprocating pump introduces a liquid into a pump chamber through a suction valve and discharges the liquid from the pump chamber through a discharge valve by reciprocating movement of a reciprocating member facing the pump chamber. The suction valve and the discharge valve include: a body portion having therein a flow path for a liquid; a valve seat portion provided at an entrance side of the flow path of the body portion and having therein a hole through which the liquid flows; a valving element provided in the body portion and able to open and close the hole of the valve seat portion; and a spring provided in the body portion for pressing the valving element into the hole of the valve seat portion. The spring has projections which are formed on an outer circumferential portion of its surface to project toward the inner wall of the body portion.
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