Abstract: A stem-operated fire-resistant gate valve including an improved metal-to-metal stem backseat a eutectic ring assembly for facilitating automatic stem backseating at pre-selected temperatures, spring enhancement of the backseating procedure, and a lost motion connection between the valve stem and the valve closure element.

Abstract: A bimetal driven control valve comprises: a main body having an inflow channel, an outflow channel, and an orifice which connects the inflow channel and the outflow channel; a first bimetal which constitutes part of a tubular body, an outer portion of the bimetal being fixed to the main body; a second bimetal which constitutes part of the tubular body and whose outer circumferential surface is formed by the same metal used for the inner circumferential surface of the first bimetal, and whose inner circumferential surface is formed by the same metal used for the outer circumferential surface of the first bimetal, the inner circumferential surface of the second bimetal being opposed to the inner circumferential surface of the first bimetal: hinges for connecting respective ends of the first and second bimetals to form the tubular body; a value member which is mounted in the main body and which is connected to an outer portion of the second bimetal for moving the valve member between a first position at which th

Abstract: An attenuator valve assembly includes a closure member having one or more attenuator plates associated with it. The closure member have the form of a ball with a bore, a ball calotte, or a butterfly valve disc, etc. The attenuating effect of the attenuator plates are called into play immediately when the closure member is first opened, with the attenuating effect greatest during initial opening of the closure member and diminishing as the closure member is moved toward the completely open position. When the closure member is in the form of a valve disc or ball calotte, the attenuator plates are mounted for rotation with the closure member spaced from the closure member.

Abstract: A closure insert assembly (10) for a control rod drive mechanism that has incorporated therein a vent valve arrangement which permits the release of air trapped in the nuclear reactor during the filling of the primary coolant system therein and allows the entrance of air into the reactor for the draining of same. To accomplish this, the vent valve is of the ball type which engages two oppositely disposed conical ball seats (44, 70), one of which is allowed to move laterally with respect to the other, causing the ball (66) and ball seats (44, 70) to be "self-centering" and resulting in a uniform compressive force being applied over minor circumferences on the ball (66). The use of conical ball seats (44, 70), one of which is laterally movable, also permits the axes of the conical ball seats (44, 70) to be non-parallel and/or non-concentric without hindering the operation and effectiveness of the vent valve.

Abstract: A remotely contollable, motorized valve suitable for microprocessor control. The valve is protected against over-closure by a technique of current sensing of motor current. Starting surges are ignored through the use of a timing circuit. The valve may be re-started in the event of mid-travel stoppage, but is still protected against damage due to such stoppage, by permitting manual reset after the valve is stopped.

Abstract: A rotary solenoid motor adapted for use in a flow control valve apparatus. The solenoid motor having a shaft on which a valve member is connected. A torsion bar is connected between the shaft and a housing for generating a torsional force opposite to an electro-magnetic force. The shaft and the housing has a pair of portions for fixing the torsion bar. Each of the portions forms a regular polygonal cross-sectional shape.