Leakfree switching process for a double-seat valve and a sealing system for carrying out the process

US5732727A · kind A · utility

Assignee

• Otto Tuchenhagen GmbH & Co. KG · DE

Inventors

• Hans O. Mieth · Hamburg, DE
• Jurgen Schreiber · Wetzlar, DE
• Markus Pawlik · Bergneustadt, DE

Key dates

• Filing date: Mar 5, 1996
• Grant date: Mar 31, 1998
• Expiry date: Mar 5, 2016

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T137/87981
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A process is disclosed for switching without leaks a double seat valve comprising radial sealing elements shaped in a slide-shaped closure member (3). In order to ensure leakfree switching, in a first embodiment of the process, radial sealing elements (1, 1*) are guided and remain sealed in a cylindrical valve seat surface (5) while the valve is opened. Sealing elements (2, 2*) provided in a second closure member (4) sealingly engage an end section (E) of the radial sealing elements (1, 1*) and the end section (E) is sealing surrounded by the sealing means (2) when the valve is further opened and when it reaches its open position. In order to carry out this process, a sealing arrangement is characterized by axial sealing elements (2, 2*) that has an axial sealing surface (2a) that cooperates with an axial valve seat surface (5a), as well as radial sealing surfaces (2b) that cooperate with the end surface (E) of a sealing surface (1a) of the radial sealing elements (1, 1*), such that the radial sealing surface (2b) sealingly surrounds the end section (E) when the closure members (3, 4) engage each other.