초록 ▼

A balanced sleeve control choke includes a choke with inlet and outlet flow passages intersecting in a cylindrical flow chamber. A balanced external sleeve and cage trim configuration which vents downstream pressure to a balance chamber within the choke body includes an external sleeve with a wear s

A balanced sleeve control choke includes a choke with inlet and outlet flow passages intersecting in a cylindrical flow chamber. A balanced external sleeve and cage trim configuration which vents downstream pressure to a balance chamber within the choke body includes an external sleeve with a wear sleeve of tungsten carbide shrink fitted therein is reciprocable within the flow chamber to control flow between the inlet and outlet flow passages. The external sleeve is closed at one end with a stem extending therefrom which is reciprocated by a handwheel operated travelling nut assembly. The external sleeve telescopes over a flow cage of composite construction secured within the flow chamber with a portion of the flow cage constructed of tungsten carbide with pressure balancing ports therethrough. The external sleeve has ports disposed within its wall which communicate downstream pressure to a balance chamber disposed thereabout. The flow cage has a seal neck extending from a closed upper end with a seal assembly disposed thereon which seals within the external sleeve and acts in conjunction with the balance chamber to eliminate any pressure forces on the travelling nut assembly.

대표청구항 ▼

A pressure balanced control choke, comprising: a pressure containing member having an internal flow chamber with an inlet flow passage thereto and an outlet flow passage therefrom, a flow controlling means reciprocable to control flow between said inlet flow passage and said outlet flow passage, a m

A pressure balanced control choke, comprising: a pressure containing member having an internal flow chamber with an inlet flow passage thereto and an outlet flow passage therefrom, a flow controlling means reciprocable to control flow between said inlet flow passage and said outlet flow passage, a means for positioning said flow controlling means, a pressure balancing means cooperating with said flow controlling means to eliminate pressure induced loading of said positioning means, said flow controlling means including: a flow cage sealingly secured within said flow chamber, said flow cage having a closed end with a seal neck extending therefrom and having pressure balancing ports therethrough, an external flow sleeve disposed about said seal neck and said flow cage, and said external flow sleeve reciprocable by said positioning means to thereby expose a portion of said pressure balancing ports to obtain a desired flow rate.