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Seal arrangement and brake valve device incorporating the seal device

A sealing device and sliding sealing technology, which is applied in the direction of valve devices, brakes, brake components, etc., can solve the problems of valve failure, large wear of piston rings in piston holes, etc.

Active Publication Date: 2009-06-10
KNORR BREMSE RAIL SYST UK LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a significant problem with piston valves is that the surfaces of the piston bore as well as the piston rings wear heavily and in many cases this wear can lead to valve failure between overhaul intervals

Method used

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  • Seal arrangement and brake valve device incorporating the seal device

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Embodiment Construction

[0011] Fig. 1 shows a piston valve unit used in a pneumatic railway brake system, comprising a main base 1, an upper base 2 arranged on the upper surface of the main base 1, wherein the main base 1 is provided with a piston hole 3, and the piston hole passes through another A hole 5 exhausts. The main air supply is provided to the first piston bore 3 through an air channel 7 with a choke. The air channel 7 then divides into two branches, one of which leads to the output stage and the second branch leads to an exhaust channel with a choke 9 at its lower end, which is suitable for venting the valve.

[0012] The piston hole 3 has a stepped structure, and the narrower cross-section is located at the lower part of the piston hole. Each piston hole is provided with a piston 10 having a stepped cross section with a narrower cross section at the bottom and a wider cross section at the upper end. Each section is provided with a piston ring 12 . The operation of each valve is contro...

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PUM

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Abstract

A sliding seal arrangement in particular for a valve having an anodised aluminium coating in contact with the seal. The coating is produced so that inclusions in the surface of the coating are substantially aligned. The direction of motion of the sliding seal in use is then substantially aligned with the direction of the inclusions resulting in greatly reduced wear on the seal.

Description

technical field [0001] The present invention relates to a piston valve unit for a brake system and in particular but not exclusively to a sealing arrangement for a piston valve unit. Background technique [0002] In the railway industry, there are standard maintenance intervals and lifetimes for various components. The overhaul interval for most components is 9 years, and the components are expected to have a 40-year life. Compared with other forms of land transportation, railway vehicles still have a high utilization rate. [0003] Conventional braking systems for railway vehicles are pneumatic and typically use diaphragm valves to control the application and release of pressure to the brake transmission. Given normal use of a rail vehicle, the valve is expected to have 44,000,000 open / close cycles between overhauls and 196,000,000 open / close cycles over its lifetime. Diaphragm valves have historically been the preferred choice due to their reliability and robustness to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16J15/32F16J15/34B60T17/22B60T15/02F16J10/04
CPCY10S251/90B60T15/021F16J10/04F16J15/32F16J15/324F16J15/34B60T17/22
Inventor C·格拉德韦尔
Owner KNORR BREMSE RAIL SYST UK LTD