PISTON PUMP AND SEAL RING - GRACO MINNESOTA INC

Title:

PISTON PUMP AND SEAL RING

Document Type and Number:

WIPO Patent Application WO/2018/000323

Kind Code:

A1

Abstract:

A piston for a single-stroke pump (20) includes a pump rod(68), a seal ring (70) extending around the pump rod (68) and having a central bore (88), and a retaining device (72) disposed on the pump rod (68) and retaining the seal ring (70) on the pump rod(68). In a forward stroke, the seal ring (70) is in a first position whereby the seal ring (70) sealingly engages the pump rod (68) such that the seal ring (70) and the pump rod (68) drive a fluid out of a pump chamber (50). When transitioning to a return stroke, the seal ring (70) is maintained still relative to a pump cylinder (30) until the retaining device (72) engages the seal ring (70), such that the seal ring (70) is in a second position. With the seal ring (70) in the second position, a flow path is opened between the seal ring (70) and the pump rod (68), allowing fluid to flow into the pump chamber (50) to prime the pump with the next pump cycle.

Inventors:

WU XUESHUI (CN)
YOU ZAIXING (CN)
WU JIBAO (CN)

Application Number:

PCT/CN2016/087888

Publication Date:

January 04, 2018

Filing Date:

June 30, 2016

Export Citation:

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Assignee:

GRACO MINNESOTA INC (US)
WU XUESHUI (CN)

International Classes:

F16N13/16; F04B53/14

Domestic Patent References:

WO2013078398A1

2013-05-30

Foreign References:

CN102667150A	2012-09-12
US3703125A	1972-11-21
CN204941912U	2016-01-06
US3176595A	1965-04-06
CN102428307A	2012-04-25

Other References: