Patent ID: 6155806
Filing Date: 2000-12-05
Classification: F04B

Abstract:
A pump for dispensing pressurized liquids, the pump comprising:a pump housing having a liquid inlet passage and a liquid outlet passage;a pumping chamber disposed in the housing and having first and second sections, the first section communicating with said liquid inlet passage and the second section communicating with the liquid outlet passage,a pump shaft having first and second ends with the second end including a flow passage and mounted for reciprocating movement in first and second opposed directions to alternately move the liquid from the first and second sections of said chamber to the liquid outlet passage during movement in the respective first and second directions, anda spring-biased flow passage check valve member including a hollow ball biased by a compression spring, said flow passage check valve member coupled to the flow passage for quickly closing the flow passage during movement in said first direction and for quickly opening the flow passage during movement in said second direction.