Sealing arrangement for a control valve and control valve

The sealing arrangement for control valves uses a movable pressure piece and threaded bushing combination to maintain consistent sealing by adjusting for wear, addressing the limitations of existing designs and enhancing durability and efficiency.

WO2026057207A1 Publication Date: 2026-03-19SAMSON AG
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Patent Information

Application Number
PCT/EP2025/070069
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-09-11
Filing Date
2025-07-14
Publication Date
2026-03-19

AI Technical Summary

Technical Problem

Existing sealing arrangements for control valves face issues such as non-self-adjusting designs, internal spring-loaded stuffing boxes with high protrusion, and threaded bushings that cannot compensate for wear and tear, leading to reduced sealing effectiveness over time.

Method used

A sealing arrangement for control valves featuring a compression element with a threaded bushing and a pressure piece, where the pressure piece is axially movable, allowing for initial compression via a threaded bushing preload and subsequent adjustment by a spring force device, ensuring consistent sealing despite wear.

Benefits of technology

The solution reduces the spring column height, minimizing manufacturing costs, installation space, and leverage, while maintaining consistent sealing by automatically adjusting to wear, thus extending the service life and reducing friction.

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Abstract

The invention relates to a sealing arrangement (100) for a control valve (200), comprising a packing (140), a compression element (110), an abutment (120) and a spring force mechanism (130), the spring force mechanism (130) being designed to apply a spring force to the abutment (120), and the abutment (120) being designed to transmit the spring force to the compression element (110). The sealing arrangement (100) according to the invention is characterised in that the compression element (110) comprises a threaded bush (111) and a thrust piece (114), the threaded bush (111) having an external thread (112) designed to engage in an internal thread (212) of the control valve (200) in order to apply a pretensioning force to the packing (140), and the thrust piece (114) being arranged axially movably in an axial bore (113) of the threaded bush (111) and being designed to apply the spring force to the packing (140). The invention also relates to a corresponding control valve (100).
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