Thomas D. Pate;Jeffrey R. Gohean;Raul G. Longoria;Richard Smalling
发明人:
Thomas D. Pate,Raul G. Longoria,Richard Smalling,Jeffrey R. Gohean
申请号：
US12425076
公开号：
US08386040B2
申请日:
2009.04.16
申请国别(地区):
US
年份:
2013
代理人:
摘要：
Systems and methods for providing a variable pumping stroke from a pump comprising a pumping chamber, a pump inlet, a pump outlet, a valving mechanism, and a drive piston. In one embodiment, the pump inlet is in fluid communication with the pumping chamber regardless of the location of the drive piston within the pumping chamber, and the pump outlet is similarly in fluid communication with the pumping chamber regardless of the location of the drive piston within the pumping chamber.
