Patent ID: 7438660
Filing Date: 2008-10-21
Classification: F16H,F16K,Y10T

Abstract:
1. A pressure regulator valve adapted to be in fluid communication with a main pressure source of pressurized fluid and in selective fluid communication with a main modulation control source of pressurized fluid, the pressure regulator valve comprising: a valve spool slidably disposed within a stepped bore defined by a valve body; a first pressure responsive surface area defined by said valve spool, said first pressure responsive surface area being subject to pressurized fluid from the main pressure source; a second pressure responsive surface area defined by said valve spool, said second pressure responsive surface area being subject to pressurized fluid from the control source; a third pressure responsive surface area defined by said valve spool, said third pressure responsive surface area being selectively subject to pressurized fluid from one of the main pressure source and the control source; and a sleeve slidably disposed within said stepped bore, said sleeve being operable to selectively distribute pressurized fluid from said one of the main pressure source and the control source to said third pressure responsive surface area to effect a change in pressure gain of the pressure regulator valve.