An adapter cap for a fire hydrant including a hydrant actuation nut by means of which the hydrant is opened and closed by rotating the hydrant actuation nut, where the adapter cap includes a cap housing having connection means for connecting the adapter cap to the hydrant actuation nut, the cap housing having a cap actuation nut by which the adapter cap may be engaged and the cap housing including a skirt part arranged to encircle at least a part of the connection means, wherein a connection means centre axis of the connection means and a cap actuation nut centre axis of the cap actuation nut are arranged coaxially, wherein the connection means and the cap actuation nut are made from metal, and wherein at least a part of the skirt part is made from a polymer material, the adapter cap further includes at least one sensor arranged in the cap housing-(4), wherein the at least one sensor is arranged to detect at least one operational parameter of the hydrant , and wireless communication means arranged in the cap housing for communicating the at least one operational parameter wirelessly to an external data system .

[Problem] To provide a valve system capable of monitoring in real time a mass of gas supplied from a valve that is periodically opened and closed, and that is capable of adjusting the output mass of gas supplied from the valve to be close to a target mass.

[Solution] The valve system operates a main actuator 60 to make a diaphragm periodically open and close a flow path (step S2), calculate an output mass of fluid that passes through the a between the diaphragm and a valve seat and output from the diaphragm valve based on displacement data detected by a displacement sensor (step S3), determines an adjustment lift amount based on the calculated output mass, and adjusts a lift amount Lf of the diaphragm 20 by the determined adjustment lift amount (step S4).

[Problem] To provide a valve system capable of monitoring in real time a mass of gas supplied from a valve that is periodically opened and closed, and that is capable of adjusting the output mass of gas supplied from the valve to be close to a target mass.

[Solution] The valve system operates a main actuator 60 to make a diaphragm periodically open and close a flow path (step S2), calculate an output mass of fluid that passes through the a between the diaphragm and a valve seat and output from the diaphragm valve based on displacement data detected by a displacement sensor (step S3), determines an adjustment lift amount based on the calculated output mass, and adjusts a lift amount Lf of the diaphragm 20 by the determined adjustment lift amount (step S4).

A system includes a manifold and a flow control valve. The flow control valve includes an inlet defining an inlet chamber, an outlet defining an outlet chamber, and a movable member positioned in a control chamber coupled with the inlet and the outlet. The manifold includes a valve actuator, an inlet port that connects with the inlet chamber, an outlet port that connects with the outlet chamber, and a control port that connects the valve actuator with the control chamber to cause the movable member to change from a sealed state that prevents fluid flow between the inlet and the outlet to an unsealed state that allows fluid flow between the inlet and the outlet responsive to operation of the valve actuator.

A drainage valve comprising a through hole, a seat around the through hole, a shutter comprising an end face and movable in a longitudinal direction between a first position in which the end face of the shutter is away from the seat and a second position in which the end face of the shutter is pressed against the seat and blocks the through hole, and an elastic element configured to keep the shutter in the first position. The shutter has a recess, emerging at its end face, configured to introduce therein a part of a tool in order to temporarily secure the part of the tool and the shutter in order to displace it in two directions longitudinally.

Systems and methods for optimizing the application of pulse width modulation (PWM) in a voltage signal for delivering a current in a valve used to alternatively deliver pressurized gas to and vent from chambers in a vitrectomy probe used to drive a cutter.

A device for controlling the flow of a fluid through a conduit from an upstream side of the device to a downstream side of the device. The device includes an upstream valve casing defining an inlet, a downstream valve casing defining an outlet aperture, and a valve core secured between the upstream valve casing and the downstream valve casing. The upstream valve casing, the downstream valve casing and the valve core are formed as discrete parts. The valve core includes a housing defining a control volume. The valve member is mounted on the housing and positioned on the upstream side of the outlet aperture, the valve member being arranged to move reciprocally to selectively open and close the outlet aperture, thereby controlling flow of the fluid through the outlet aperture.

A control device for a WG actuator includes a feedback control unit for performing feedback control on the WG actuator in such a way that the position of a shaft detected by a position sensor gets close to a target position, and an abnormality detecting unit for providing an instruction to move the shaft in an axial direction for the feedback control unit, and for detecting an abnormality in the WG actuator on the basis of a result of a movement of the shaft, the movement being detected by the position sensor while the feedback control unit performs the instruction.

A diagnosis apparatus for a valve system including a control valve, a servo valve for driving the control valve, and at least one servo module for providing a control signal based on an opening degree command value for the control valve to the servo valve is provided with: at least one opening degree detection part configured to detect an actual opening degree of the control valve; and a diagnosis part configured to acquire, from the opening degree detection part, a detected value of the actual opening degree of the control valve while a diagnostic opening degree command value is input to the at least one servo module, and diagnose an abnormality of the valve system on the basis of the detected value. The diagnostic opening degree command value changes in multiple steps between a maximum opening degree and a minimum opening degree through one or more intermediate opening degrees.

An interchangeable orifice wellhead system is disclosed which comprises a flow control valve comprised of a male union, a female union, a valve cap, and an orifice plate. The orifice plate can include a display tab, which visually communicates to the technician the size of orifice plate aperture. Orifice plates having different size apertures can be interchanged within the same flow control valve. In some embodiments, the male union of the flow control valve can be machined or interchanged with another male union to be used with different size orifice plates.