Gas pressure limiting valve with annular gap seat for control and discharge of gaseous media

Abstract

The invention relates to a gas pressure limiting valve (1) for controlling a gaseous medium, especially hydrogen, said gas pressure limiting valve having a housing (7) and a valve element mounting assembly (17), wherein the valve element is mounted The assembly (17) has a valve element (3) that opens and closes in the direction of the longitudinal axis (14) and is thus movable, wherein the valve element mounting assembly (17) has a sealing seat plate (2), wherein the sealing The seat plate (2) has a sealing seat edge (12) running around the longitudinal axis (14), which forms a seal together with the valve element (3) in the closed state of the valve (1). seat. According to the invention, the sealing seat plate (2) is designed such that it has a central region (20) which is connected to the sealing seat plate (2) via at least one web (29), wherein , the sealing seat plate (2) is configured with an annular flow portion (23), which extends in the direction of the longitudinal axis (14), wherein the sealing seat plate (2) or the valve element (3) have at least two surrounding sealing seat edges (12a, 12b), which are in contact with the valve element (3) or the sealing seat plate in the closed state of the valve (1) (2) Together they form at least two sealing seats (6a, 6b).

Description

technical field [0001] The invention relates to a pressure limiting valve, in particular a gas pressure limiting valve, for controlling and venting a gaseous medium, especially hydrogen, having a valve element assembly and in particular for use in a vehicle with a fuel cell drive . Background technique [0002] In the field of vehicles, in addition to liquid fuels, gaseous fuels will also play an increasingly important role in the future. In particular, in vehicles with a fuel cell drive, the flow of hydrogen must be controlled. Here, the gas flow is no longer controlled discontinuously as in the case of liquid fuel injection, but the gas is taken from at least one high-pressure tank and conducted via the inflow line of the medium-pressure line system to the injector unit. The injector unit conducts the gas to the fuel cell via the connecting lines of the low-pressure line system. [0003] From DE 10 2013 204 563 A1 a pressure limiting valve is known with a housing and a ...

AI Technical Summary

Problems solved by technology

[0004] The pressure limiting valve known from DE 10 2013 204 563 A1 may have certain disadvantages

[0005] Only a small flow cross-section is formed when the pressure-limiting valve opens only slightly and thus has a small opening stroke, which results in a low medium flow

This has the result that only a small amount of medium can flow out when opening the pressure limiting valve, especially in the initial phase of opening, and thus the pressure drop in the system requires a very high time-consuming

[0006] A further disadvantage of the pressure limiting valve known from DE 10 2013 204 563 A1 is that, during closing of the pressure limiting valve, the closed end position is achieved by the sealing seat edge of the sealing seat plate hitting the valve element, to form a sealing seat

Due to the material properties of the sealing seat plate, in particular the sealing seat edge and the valve element, which may consist in particular of hard metal materials, impulse forces and impact forces act on these two components, which can lead to damage

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