Patent ID: 7891375
Filing Date: 2011-02-22
Classification: F15B,F16K,Y10T

Abstract:
1. A softstart valve means, comprising a main valve member placed between a primary duct conducting pressure medium at a primary pressure and a secondary duct, said main valve member being biased, or able to be biased by a closing force into a closed position disconnecting the connection between the primary duct and the secondary duct, said main valve member being able to be switched over by an oppositely acting opening force overriding the closing force into an open position opening the connection between the primary duct and the secondary duct, the opening force being derived in a secondary pressure controlled operational mode of the valve means by the gradually increasing secondary pressure of the pressure medium, such pressure medium flowing, bypassing the main valve member, via a choke means from the primary duct into the secondary duct, wherein switch over means are present which permit the switching over of the operational mode of the valve means between the secondary pressure controlled operational mode and a time controlled operational mode switching over the main valve independently of the secondary pressure purely time dependent into the open position, and wherein the secondary pressure in the time controlled operational mode is switched to be devoid of force effects as regards the main valve member and the main valve member, instead of this, for producing the opening force is acted upon in the opening direction by a pressure medium flowing in in a choked manner without any connection with the secondary duct.