Patent ID: 6325101
Filing Date: 2001-12-04
Classification: F16K,Y10T

Abstract:
A choke valve comprising:a valve housing having an inlet and an outlet,a choke body, selectively positionable in the valve housing for adjusting a flow aperture, the choke body including a cylindrical choke piston, which plunges coaxially into an inlet flow duct communicating with the inlet, said choke piston being in sealing contact at a peripheral seal area with a wall of the inlet flow duct, the axial position of the seal area being dependent on a choke setting of the choke piston,a plurality of outlet ducts being provided in the wall of the inlet flow duct, the outlet ducts communicating with the outlet and with transfer openings in the wall distributed along a setting stroke of the seal area, the flow aperture being defined by a cross section of the transfer openings, which is open to an upstream section of the inlet flow duct, andat least one bypass duct not influenced by the choke body disposed between the inlet and the outlet, and a check valve adapted to prevent flow toward said outlet.