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US 5,277,403 AGranted
Balanced, steam control valve assembly, and a plug-type valving element therefor
AssigneeDresser-Rand Company
InventorsJohn Waggott, George M. Lucas
Life of this patent
Estimating the term…
Abstract
A substantially cylindrical, plug-type configuration of the element offers a mass which is less responsive to non-uniform and unsteady pressures, and channeling therein opens centrally, and about the periphery thereof, onto a recess formed in an end of the element which closes onto a valve seat. The channeling and recess are cooperative to assure that the balance-end of the element will have average, representative pressures conducted thereto.
Claims10
A balanced, steam control valve assembly, comprising:
- an annular valve seat;
- a plug-type valving element for closure upon, and removal from, said seat;
- and
- a valve bonnet having a central, longitudinal bore formed therethrough;
- wherein
- said valving element has a valving head and a stem;
- said stem is slidably engaged with said bore;
- said bonnet has a depending, cylindrical guide;
- said head is slidably engaged with said guide;
- said head has fluid-accommodating channel means formed therein for pressure-balancing one end of said head with an opposite end of said head;
- one end of said head has means formed therein for insuring that an average and representative pressure obtaining thereat will be addressed to an opposite end of said head via said channel means;
- said last-named means formed in one end of said head comprises a recess;
- said channel means comprises a central, axial bore formed in said head, and a plurality of passageways diverging from, and in fluid-flow communication with, said central, axial bore;
- and
- said passageways open, externally of said head, onto said one end, and said opposite end.
12 more elements
A plug-type valving element, for a balanced, steam control valve assembly, comprising:
- a valving head and an integral stem;
- wherein
- said head has fluid-accommodating channel means formed therein for pressure-balancing one end of said head with an opposite end of said head;
- one end of said head has means formed therein for insuring that an average and representative pressure obtaining thereat will be addressed to an opposite end of said head via said channel means;
- said last-named means formed in one end of said head comprises a recess;
- said channel means comprises a central, axial bore formed in said head, and a plurality of passageways diverging from, and in fluid-flow communication with, said central, axial bore;
- and
- said passageways open, externally of said head, onto said one end, and said opposite end thereof.
5 more elements
Dependencies are inferred from the claim text.