Patent ID: 7309113
Filing Date: 2007-12-18
Classification: F16K,F17C,Y02E,Y10T

Abstract:
1. A flow control system for a valve comprising: a valve body having a main flow passage connecting a first area at a first pressure to a second area at a second pressure; a first shuttle valve having a first shuttle face and a backpressure face, the shuttle face having a seal face operative for opening and closing the main flow passage, the shuttle face being in communication with the main flow passage between the seal face and the second area, the shuttle valve being biased for closing the main flow passage; a backpressure passage extending between the first area and the backpressure face and having a metering orifice therealong; a bleed passage extending between the second area and the backpressure face and having a bleed orifice therealong; a second valve operable for opening and closing the metering orifice wherein