Steam governing valve

Details Steam governing valve Steam governing valve

1990-03-06

1992-06-09

Nilson, Robert G.

Fluid handling

Systems

Sequentially progressive opening or closing of plural valves

13763014, F16K 100

Patent

active

051198592

ABSTRACT:
A steam governing valve includes a valve body constituting a main valve together with a main valve seat formed on a casing body and having a smaller valve seat inside thereof, a valve rod movable in the valve body in an axial direction of the valve and constituting a smaller valve together with the smaller valve seat, a sleeve arranged in the casing body and guiding the valve body in an axial direction, and a pressure chamber defined by the casing body, the valve body and the sleeve. The pressure chamber communicates with an entrance chamber through a clearance provided on the sliding portions of the sleeve and valve body, and the main valve is opened by lifting the valve rod beyond the fully open position of the smaller valve. The valve body is formed on the cylindrical outer surface thereof with a plurality of axially extending grooves arranged at equal intervals in a circumferential direction. The sleeve is formed with a plurality of steam passages at positions opposite to the axially extending grooves and the pressure chamber communicates with the entrance chamber through the steam passages and the axially extending grooves when the valve body is lifted beyond a predetermined valve opening degree.

REFERENCES:
patent: 3575213 (1971-04-01), Schnall
patent: 4928733 (1990-05-01), Sudolnik

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