| 摘要 |
In a blow-off valve (5) which can be used for compressed air systems, especially in motor vehicles, the valve body (23) used generally operates relative to a valve seat under the action of a spring (29); when a predeterminable pressure is reached, the valve body is lifted off its valve seat (27), allowing compressed air from the compressed-air producer to be blown off into the outside air after passing through the blow-off valve (5). In order to reduce the loud noises which occur due to the explosive expansion of the compressed air when the blow-off valve (5) opens, a valve damper (9) is placed in effective connection with the valve body (23). The valve damper (9) is hydraulic in its action and operates in the opening direction of the valve body of the blow-off valve in such a way that the opening movements of the valve body (23) take place in a delayed fashion, thereby making possible a reduction in the expansion noises. The valve damper (9) has a piston (17) which is displaceably arranged in a housing (11) filled with hydraulic oil and which acts on the valve body (23) of the blow-off valve by means of a piston rod (15) connected to it, the delay in the valve movements being caused by the restricted volume compensation between the two sides of the piston (17). <IMAGE>
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