Fluid regulator

Abstract

A fluid pressure regulating unit ( 1, 28, 35, 56, 58 ), comprises a fluid inlet port ( 3 ), a fluid outlet port ( 4 ), a valve means ( 6 ) and a main valve biasing means ( 14, 36 ). The main valve biasing means ( 14 ) biases said valve means ( 6 ) in the direction of an open position. An auxiliary valve biasing means ( 26 ) is provided, biasing the valve means ( 6 ) in the direction of a closed position.

1 . A fluid pressure regulating unit, comprising a fluid inlet port, a fluid outlet port, a valve means and a main valve biasing means, wherein said main valve biasing means biases said valve means in the direction of a first position, comprising an auxiliary valve biasing means, wherein said auxiliary valve biasing means biases said valve means in the direction of a second position, being different from said first position. 
     
     
         2 . The fluid pressure regulating unit as claimed in  claim 1 , wherein said first position and said second position are opposing each other, in particular that said first position corresponds to an open position and said second position corresponds to a closed position of said valve means. 
     
     
         3 . The fluid pressure regulating unit as claimed in  claim 1 , wherein said main valve biasing means and/or said auxiliary valve biasing means comprises a fluid pressure operated member and/or an elastically deformable member, in particular a spring, preferably a metal spring and/or a helically wound spring. 
     
     
         4 . The fluid pressure regulating unit as claimed in  claim 1 , wherein at least one of said valve biasing means, in particular said main valve biasing means is adjustable. 
     
     
         5 . The fluid pressure regulating unit as claimed in  claim 1 , wherein said valve member comprises a variable fluid flow cross section. 
     
     
         6 . The fluid pressure regulating unit as claimed in  claim 1  wherein said valve member comprises an axially movable tubular unit, wherein preferably said tubular unit comprises an inner passage. 
     
     
         7 . The fluid pressure regulating unit as claimed in  claim 1 , wherein said valve member comprises a valve seat with an essentially even surface, in particular a plate-like valve seat. 
     
     
         8 . The fluid pressure regulating unit as claimed in  claim 1 , wherein the position of said valve means is essentially independent of the fluid pressure in said fluid inlet port and/or the position of said valve means is at least partially dependent on the fluid pressure in said fluid outlet port. 
     
     
         9 . The fluid pressure regulating unit as claimed in  claim 1 , comprising at least one fluid inlet side pressure balancing means. 
     
     
         10 . The fluid pressure regulating unit as claimed in  claim 1 , wherein essentially every surface part, being fluidly connected to said fluid inlet port and having a surface normal at least partially in parallel to the moving direction (A) of the moving part of said valve means, is balanced by a balancing surface part. 
     
     
         11 . The fluid pressure regulating unit as claimed in  claim 1 , wherein said valve member, in particular said axially movable tubular unit is designed and arranged with a minimum of surface parts, being fluidly connected to said fluid inlet port and having a surface normal at least partially in parallel to the moving direction (A) of the moving part of said valve means, in particular in that said axially movable tubular unit comprises a tapered surface part. 
     
     
         12 . The fluid pressure regulating unit as claimed in  claim 1 , wherein said valve means is in said second position, in particular in a closed position, if said main valve biasing means is in a weakly biased and/or unbiased state. 
     
     
         13 . The fluid pressure regulating unit as claimed in  claim 1 , comprising at least one actuator means. 
     
     
         14 . The fluid pressure regulating unit as claimed in  claim 13 , wherein pilot pressure applying means are provided, which preferably can be selectively connected to said first fluid port and/or said second fluid port. 
     
     
         15 . The fluid pressure regulating unit as claimed in  claim 14 , wherein said pilot pressure applying means can be connected to a respective fluid pressure reservoir via a fluid throughput reducing means.