Abstract: A valve drive device includes a hydraulic cylinder that is configured to drive a regulating valve, an actuator that is configured to supply hydraulic oil to the hydraulic cylinder, and a connection pipe through which the hydraulic cylinder with the actuator communicate with each other and the hydraulic oil flows. The hydraulic cylinder includes a cylinder body to which the hydraulic oil is supplied, a piston movable in a central axis direction of the cylinder body by the hydraulic oil supplied to the cylinder body, and a cylinder base on which the cylinder body is placed in a state where the central axis direction is coincident with a vertical direction. The cylinder base has hydraulic oil flow path portion connected to the connection pipe and through which the hydraulic oil flows.

Abstract: The disclosure relates to a method for commissioning pneumatically operated actuators that are controlled by a positioner. To determine the drive type, a constant flow of pneumatic fluid is applied to the actuator during commissioning while a drive-specific characteristic curve of the fed back position is recorded over time. Then the measured characteristic curve is compared with a given specimen characteristic curve. The drive type is inferred from the level of difference or agreement between the drive-specific characteristic curve and the specimen characteristic curve.

Abstract: A control valve assembly for flushing a sanitary fixture includes a burst valve for supplying flush water flow at the beginning of a flush cycle and an independently controlled bypass valve for providing trap reseal flow after the burst valve closes. The burst valve includes a timing sleeve cooperating with a lifting piston to define a timing chamber communicating with inlet pressure through an orifice. A piston collar cooperates with the lifting piston to define the bypass valve. A lifting chamber defined between the body and the lifting piston communicates with the outlet through a metering valve assembly. Actuation of the metering valve assembly empties the lifting chamber and lifts the timing sleeve, opening the burst valve. The burst valve is closed when the timing chamber fills at a rate controlled by the orifice. The bypass valve is maintained open by pressure differential across the bypass valve to supply trap reseal flow until the metering valve assembly recloses.

Abstract: A moisture-responsive valve assembly includes a housing having a moisture-swellable body to swell in volume in response to soil moisture, and a bi-stable snap-action device for controlling the valve in response to the volume of the moisture-swellable body. The valve assembly further includes a damped delay mechanism effective to close the valve after it has been open for a predetermined period of time.

Abstract: A valve assembly is disclosed in which a valve adapted for opening a fluid passage is normally biased into closed position. The valve is opened by movement of a piston operated by hydraulic pressure of a liquid contained in a chamber disposed behind the piston. The hydraulic pressure of the liquid is generated by an actuating force, such as manual depression of a handle. A duct permitting restricted flow of the hydraulic liquid, however permits escape of the hydraulic liquid from the chamber when the hydraulic liquid is pressurized and thereby gradually relieves pressure from the piston even when the actuating force is maintained. The hydraulic liquid escapes into a second chamber from where it returns through a relief valve into the first chamber when there is no actuating force on the handle.

Abstract: A timer-controlled valve comprises a valve member movable from a home position to an actuated position with respect to a passageway in the valve housing, an operator manually movable from a home position to a plurality of preselected actuated positions to preselect a predetermined time interval, the operator being coupled to the valve member so that the latter moves therewith, and a dashpot device for returning the operator from its preselected actuated position to its home position after the elapse of a predetermined time interval, the valve member also being returned to its home position with the operator.

Abstract: A fluid flow control valve in which flow from an inlet (14) to an outlet (16) is controlled by engagement between a surface (92) and a seat (90). The surface (92) is displaced from the seat (90) when a closure member (44) is lifted to permit flow from a control chamber (26) through a bore (42). The resultant pressure drop in the chamber (26) enables pressure externally of the chamber (26) to displace the wall (34) which lifts the spigot 40 and hence the surface 92. When the closure member (44) re-seats, the chamber (26) can fill through a bore (56) and the wall (34) returns to its initial condition to close the valve. An operating member (66) protrudes through a shower rose (20). When the member (66) is pushed up, the piston (70) attempts to slide in the cylinder (74) and causes a pressure increase which thus displaced the cylinder (74 ) and hence the closure member (44).

Abstract: A thermostatic expansion device for use in refrigeration systems includes a valve member adapted to control the flow of liquid refrigerant from a condenser to an evaporator of the refrigeration system. A pressure-responsive device is operatively connected to the valve member for responding to a differential pressure in the refrigeration system so as to open and close the valve member. A temperature-responsive device is operatively connected to the pressure-responsive device for responding to a temperature of the refrigerant at the outlet of the evaporator. A lead-lag compensation structure is connected to the pressure-responsive device for permitting a rapid movement of the valve member upon the occurrence of a sudden change either in the temperature of the refrigerant at the outlet of the evaporator or in the pressure at the inlet of the evaporator thereby maintaining a constant superheat at the outlet of the evaporator so as to effect stability of the refrigeration system.