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公开(公告)号：US5050895A
公开(公告)日：1991-09-24
申请号：US333342
申请日：1989-04-04
申请人： Mohamed A. Hashish , John H. Olsen , Anton H. Buchberger , Olivier L. Tremoulet, Jr. , Sigurd C. Mordre , David K. M. Tan
发明人： Mohamed A. Hashish , John H. Olsen , Anton H. Buchberger , Olivier L. Tremoulet, Jr. , Sigurd C. Mordre , David K. M. Tan
摘要： A seal assembly having a backup ring through which a piston reciprocates. There is a seal sleeve made of a non-abrading, extrusion resistant material that surrounds the piston at a location forwardly of the backup ring. The backup ring has an opening to receive the piston, and the opening is formed to define a radially and rearwardly expanding gas between the piston and backup ring to receive and discharge any seal material which may extrude into the gap. There is a positioning flange integral with the backup ring that surrounds the seal sleeve to press the seal sleeve into engagement with the piston, and there is an outer seal portion to form a seal between the positioning flange (or the outer portion of the backup ring) and the cylinder.
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公开(公告)号：US5037277A
公开(公告)日：1991-08-06
申请号：US385714
申请日：1989-07-26
申请人： David K. M. Tan
发明人： David K. M. Tan
CPC分类号： F04B53/1087 , F16K17/0433 , Y10T137/7929
摘要： An outlet valve for a high pressure pump which is designed to alleviate "sticking" of the moveable valve element. An annular recess is formed at a transitional flow area where high pressure fluid flows forwardly and then radially outwardly between contact surfaces of the valve element and a valve seat member. It is believed this alleviates a problem of separated flow at the transition area which would effectively decrease the flow area and cause a localized pressure reduction which would delay proper opening of the valve element. Also, other configurations are shown for tripping the boundary layer to avoid separation, and other configurations to alleviate the same.
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