Patent ID: 6253787
Filing Date: 2001-07-03
Classification: E21B,F16K,Y10T

Abstract:
A fluid control system comprising:a housing having an inlet passage, an axial bore a portion of which forms an outlet passage, and a chamber;a choke member adapted for movement in the housing to control the flow of fluid from the inlet passage to the outlet passage, the fluid applying a force on one end of the choke member;a source of control fluid connected to the chamber so that the control fluid applies an equal force on the other end of the choke member to control the position of the choke member in the housing in a manner to exert a back pressure on the fluid in the inlet passage;a washer attached to the choke member and projecting radially outwardly from the choke member, the outer surface of the washer moving in the chamber and cooperating with a corresponding surface of the housing to define a restricted area for the fluid in the chamber, for dampening the movement of the choke member;a mandrel fixed to the housing and extending in another portion of the bore; anda shuttle connected to the choke member and slidably mounted on the mandrel within the latter bore portion.