Patent EP0095448A1 successfully refreshed from Google Patents.
EP0095448A1
Expired / Lapsed
EP
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Sealing device for a high pressure pump
Assignee: Pfizer Health AB
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Filing: 1983-02-03
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Granted: —
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Expires: 2003-02-03
Abstract
Abstract A sealing device in a piston pump working at high pressure, e.g. for use in so-called High Performance Liquid Chromatography (HPLC), the pump comprising a piston (1) which carries out a reciprocating motion through a cylindrical sealing (6) in the displacement chamber (2) of the pump whereby the piston (1) at the side of the sealing (6) opposite to the displacement chamber (2) is surrounded by a sealed annular slot (9) which could be washed by a washing medium so as to remove residual products of the pump medium passing the sealing from the piston.
Inventors
- 👤 Jörgen Sjödahl
- 👤 Jörgen Ericson
- 👤 Rolf Israelsson
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 07:01
CPC Classifications
F; F04; F04B; F04B53/00; F04B53/16; F04B53/162; F04B53/164
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
90 words
A sealing device in a piston pump working at high pressure, e.g. for use in so-called High Performance Liquid Chromatography (HPLC), the pump comprising a piston which carries out a reciprocating motion through a cylindrical sealing in the displacement chamber of the pump, characterized in that the piston at the side of the sealing opposite to the displacement chamber is surrounded by a sealed annular slot which could be washed by a washing medium so as to remove residual products of the pump medium passing the sealing from the piston.
Claim 2
Dependent Claim
90 words
A sealing device in a piston pump working at high pressure, e.g. for use in so-called High Performance Liquid Chromatography (HPLC), the pump comprising a piston which carries out a reciprocating motion through a cylindrical sealing in the displacement chamber of the pump, characterized in that the piston at the side of the sealing opposite to the displacement chamber is surrounded by a sealed annular slot which could be washed by a washing medium so as to remove residual products of the pump medium passing the sealing from the piston.
Claim 3
Dependent Claim
24 words
Sealing device according to claim 1, characterized in that the pump medium is used as a lubrication means for the piston at the sealing.
Claim 4
Dependent Claim
18 words
Sealing device according to claim 1, characterized in that the annular space is limited by a further sealing.
Claim 5
Dependent Claim
21 words
Sealing device according to claim 1, characterized in that the annular space is limited by a bellows attached to the piston.
Claim 6
Dependent Claim
21 words
Sealing device according to claim 4, characterized in that the annular space is a displacement chamber for pumping the washing liquid.
References Cited (Backward Citations)
GB1400601A
Cited
AT349903B
Cited
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