초록 ▼

A valve is disclosed for regulating the flow of a pressurized working fluid through a nozzle having a nozzle throat. In a preferred embodiment of the invention, the valve comprises a valve body defining a valve bore, a pressure inlet and a nozzle plenum. The nozzle plenum fluidly communicates with t

A valve is disclosed for regulating the flow of a pressurized working fluid through a nozzle having a nozzle throat. In a preferred embodiment of the invention, the valve comprises a valve body defining a valve bore, a pressure inlet and a nozzle plenum. The nozzle plenum fluidly communicates with the nozzle throat. A valve seat is disposed between the pressure inlet and the nozzle plenum. A valve member is slidably disposed within the valve bore. The valve member comprises a first end disposed proximal the valve seat and a second end distal the valve seat. The first end comprises a valve face and the second end comprises first and second rear surfaces. The second rear surface is spaced apart from the first rear surface. The first rear surface cooperates with the valve bore to define a rear chamber. The second rear surface cooperates with the valve bore to define an actuation chamber, the volume of which is not a function of the valve member diameter. The valve member is responsive to pressure in the second chamber to move between a first position and a second position. In the first position, the valve face is spaced apart from the valve seat thereby permitting fluid communication between the pressure inlet and the nozzle plenum. In the second position, the valve face is seated against the valve seat thereby precluding fluid communication between the pressure inlet and the nozzle. A conduit provides fluid communication between the nozzle plenum and the first chamber.

대표청구항 ▼

[ What is claimed is:] [1.]1. A valve for regulating the flow of a pressurized working fluid through a nozzle having a throat, the valve comprising:a valve body defining a first chamber and having a volume and a first plenum, said first plenum fluidly communicating with the throat;a first conduit pe

[ What is claimed is:] [1.]1. A valve for regulating the flow of a pressurized working fluid through a nozzle having a throat, the valve comprising:a valve body defining a first chamber and having a volume and a first plenum, said first plenum fluidly communicating with the throat;a first conduit permitting fluid communication between said first chamber and said first plenum;a first pressure inlet supplying the pressurized working fluid to said first plenum;a valve member disposed within the valve body between said first chamber and said first plenum, said valve member movable between a first position and a second position, said first position comprising the valve member being spaced apart from said first pressure inlet thereby allowing fluid communication between said first pressure inlet and said first plenum, and said second position comprising the valve member blocking fluid flow from the first pressure inlet; anda second pressure inlet operatively coupled to said valve member, wherein at least a substantial portion of flow through said second inlet into the valve is isolated from the flow in the valve through said conduit, wherein said valve member being responsive to rising pressure in said second pressure inlet to move from said first position to said second position, and responsive to falling pressure to move from said second position to said first position, wherein movement of the valve member changes the volume of the first chamber wherein when in the second position the volume of the first chamber is greater than the volume of the first chamber when the valve member is in the first position.