Valves and valve actuation – Reciprocating valve – Piston
Patent
1994-08-18
1996-07-30
Fox, John C.
Valves and valve actuation
Reciprocating valve
Piston
251118, 251123, F16K 100
Patent
active
055404154
ABSTRACT:
A steam isolation valve system for opening and closing a steam flow passage of a steam flow comprises a valve body, a valve disk accommodated in the valve body to be reciprocatingly movable for opening and closing the steam flow passage, and a drive mechanism for moving the valve disk along an axial direction of the valve body. The steam flow passage has a portion elliptical in section having a short axis in a direction of the reciprocating axis of the valve disk projected on a plane perpendicular to an axis of the steam flow passage. The steam flow passage has a throttling inlet passage which is deformed in shape from a circular tube portion having a diameter D on a steam upstream side to an elliptical tube portion having a long side diameter D and a short side diameter D cos.theta. (45.degree..ltoreq..theta..ltoreq.65.degree.) on a steam downstream side, an intermediate passage which has an elliptical shape of the same diameters as that of the elliptical tube portion of the inlet passage and to which is connected a tube in which the valve disk is reciprocated with an inclination .theta. with respect to the axis of the steam flow line, and enlarging outlet passage which is deformed in shape from an elliptical tube portion having the same diameter as that of the elliptical tube portion of the intermediate passage at a steam upstream side to a circular portion having a diameter D at a steam downstream side.
REFERENCES:
patent: 2685426 (1954-08-01), MacGregor
H. Richter, "Rohrhydraulik", p. 274, (1958), Germany.
A. H. Gibson, "Hydraulics and its Applications", pp. 87-89, (1919), London.
Yamada Katsumi
Yamamoto Tetsuzo
Fox John C.
Kabushiki Kaisha Toshiba
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