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Back to the List of the Granted Patents                                                Click here to download AP2549 PDF

(11)Patent No :AP 2549(73) Applicant(s)

(21)Application No :AP/P/2009/004843AEL MINING SERVICES LIMITED, AECI Place, The

Woodlands, Woodlands Drive, Woodmead, 2196 Sandton,

 

(22)Filing Date :20.11.2007South Africa

(24)Date of Grant &31.12.2012

 

(45)Publication : 

 

(30)  Priority Data(72) Inventors

 

(33) Country(31) Number(32) DateBÜHRMANN Rudolph Teodor, South Africa

ZA2006/0969521.11.2006BÜHRMANN Rudolph, South Africa

 

NEIMANN Frank, South Africa

et al

(74) Representative

(84)Designated State

 

BW  GM  GHKE   MW  TZUG   ZM  ZWHONEY & BLANCKENBERG

 

(51)InternationalClassificationF04B 1/00 (2006.01)F01L 1/16 (2006.01)

(54)Title 

Double acting piston pump 

 

(57)Abstract 

 

A piston pump which includes a seal formed by a valve member inside a cylinder with an end zone through which extends a fluid entry port, and wherein a piston rod is movable in a forward direction into a recess in the valve member, thereby to apply fluid pressure and then mechanical pressure to the valve member to displace the valve member into sealing engagement with end zone, and in a reverse direction to reduce pressure inside the recess thereby to unseat the valve member from the zone 

(56)Documents Cited :US 2 789 510 A    WO 02/116766 A

 

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