Choke valve
AssigneeAtlantic Richfield Company
InventorHerbert A. Wolcott, II
Life of this patent
Estimating the term…
Abstract
A flow line control valve is provided with internal erosion and corrosion trim liners and means for detecting for leaks in the liners. There is also provided fuller range, positive shutoff throttle means designed to reduce erosion and corrosion of the throttling parts and valve seat. The low flow rate throttling action is provided by progressive and accumulative flow through one or more stages of throttling flow passages of and by a nose end of the throttling means. Preferably the nose end is concavely tapered. Also preferably two or more stages of throttling spaced apart flow passages of increasing size are employed. Postive long lasting shut-off is assured by combining throttling and seat surfaces of different angles of taper.
Claims5
A well flow line choke control valve comprising:
- valve body means including a valve inlet flow passage adapted to be connected to a flow line, an inner surface defining a valve chamber, and a valve outlet flow passage adapted to be connected to a flow line;
- valve seat means disposed in said body between said inlet flow passage and said outlet flow passage, said valve seat means having a valve seat flow passage extending therethrough;
- valve throttle means adapted to be moved relative to said valve seat means and to control the rate of fluid flowing through said control valve;
- liner means inside said valve body, said liner means having opposed ends and an inner surface defining a liner flow passage,
- an inner surface of said valve body and an outer surface on said liner means adapted to define a monitoring flow passage for monitoring for a leak in said liner means, said monitoring flow passage being further defined by a spiralling groove formed in said outer surface on said liner means to provide for supportive engagement of said liner means between said inner surface of said valve body and said outer surface of said liner means;
- a flow passage extending through said valve body and communicating with said monitoring flow passage;
- and
- sealing means adapted to form a fluid-tight seal near respective ones of said ends of said liner means between said liner means and said valve body.
Dependencies are inferred from the claim text.