Embodiments of systems and methods that can facilitate data collection for valve diagnostics. The systems can include a valve assembly with a valve and a sampling device that is configured to access a repository with a first buffer and a second buffer. During operation, the valve assembly is configured to read data representing operating variables for the valve into the first buffer. The valve assembly is also configure to determine a quality measure for a first sample set of data from the first buffer, the quality measure indicating the usefulness of the first sample set of data for predicting performance of the valve relative to a second sample set of data from the second buffer. In one embodiment, the valve assembly is further configured to read data from the first buffer into the second buffer in response to the quality measure indicating that the first sample set of data is relatively more useful than the second sample set of data.

A device (1) for measuring a valve seat formed in a piece has an elongate shape and defines a longitudinal axis (A), and includes: a slide (9), slidingly coupled to a guide (11) for translating in a scanning direction (B) inclined to the longitudinal axis; a sensor (10), mounted on the slide for measuring a parameter relating to a profile of the seat; a processing unit connected to the sensor; a rotary actuator (13) defining a longitudinal rotation axis substantially parallel to the longitudinal axis of the device; and a transmission assembly interposed between the rotary actuator and the slide for transforming a rotary motion about a longitudinal rotation axis in a reciprocating linear motion of the slide along the scanning direction.

A valve for adjusting a fluid flow. The valve includes a valve body, a flow having an inlet and an outlet located downstream of the inlet, a flow adjustment arrangement for adjusting the flow of liquid from the inlet to the outlet, wherein liquid upstream of the flow adjustment arrangement but downstream of the inlet has an upstream pressure, and liquid downstream of said flow adjustment arrangement but upstream of the outlet has a downstream pressure, a stationary differential pressure sensor configured to measure a pressure difference between the upstream pressure and the downstream pressure, and a pair of pressure ports for enabling temporary connection of a non-stationary differential pressure sensor for measuring the pressure difference between the upstream pressure and the downstream pressure. Also a method for use with such a valve.

A mass flow control apparatus and methods for calibrating and tuning the mass flow apparatus are provided. The mass flow apparatus can be calibrated by receiving a calibration input signal that provides one or more properties of a gas that is flowing through a main fluid flow path and performing one or more measurements, using one or more sensors, on the gas. The calibration includes determining a calibration parameter based on the results of the one or more measurements and the calibration input signal and adjusting a proportional valve, based on the calibration parameter, to adjust a flow rate, of the gas through the apparatus, to match a setpoint flow rate.

Systems and methods described herein provide for pressure relief valve detection and monitoring. A valve assembly includes a striker and an indicator assembly separated by a diaphragm. The diaphragm may be elastically or permanently deformable. The striker may be connected to a relieve valve disk that releases in response to high fluid pressure at the valve. Movement of the striker may be detected by contact with the diaphragm or by sensors near the diaphragm, which may trigger the indicator assembly to provide an external indication of a valve opening.

A diagnostic method for solenoid valves includes detecting, at excitation of the solenoid, a variation rate of the supply voltage of the solenoid and comparing it with a predetermined value, generating an error signal if the variation rate is lower than the predetermined value, otherwise, detecting characteristics of the waveform of the solenoid current over a time interval between a moment of excitation of the solenoid and a moment wherein the movable core reaches end-stroke position, comparing the detected characteristics with threshold values, generating an alarm signal if the detected characteristics are lower than the threshold values, otherwise calculating the value of solenoid resistance and comparing it with a minimum resistance value and a maximum resistance value when the solenoid current is in steady state, and generating an alarm signal if the solenoid resistance value is lower than the minimum resistance value or greater than the maximum resistance value.

A chemical stick launcher includes a stack of vertically mounted low voltage electrically operated valves providing spaces between the valves for chemical sticks. The valves are manipulated by a controller to drop sticks from the compartments between the valves after suitable time delays so the launcher can supply chemicals to a hydrocarbon well over a period of time. The stack is insulated to reduce the operating temperature of the launcher and thereby allow a wider variety of chemical compositions to be used. The low voltage electrically operated valves include a front panel providing a visual indicator of whether the valves are open or closed. The valves are mounted on the stack so the front panels face in the same direction so a standing person can see all the indicators from a single position.

A chemical stick launcher includes a stack of vertically mounted low voltage electrically operated valves providing spaces between the valves for chemical sticks. The valves are manipulated by a controller to drop sticks from the compartments between the valves after suitable time delays so the launcher can supply chemicals to a hydrocarbon well over a period of time. The stack is insulated to reduce the operating temperature of the launcher and thereby allow a wider variety of chemical compositions to be used. The low voltage electrically operated valves include a front panel providing a visual indicator of whether the valves are open or closed. The valves are mounted on the stack so the front panels face in the same direction so a standing person can see all the indicators from a single position.

The present invention relates to a stop valve for installation in a pipeline, in particular in a pipeline of a nuclear facility, such as a nuclear power plant, or in a conventional chemical reactor and in a conventional power plant, to stop a fluid flow through the pipeline in the event of an operational failure. The valve comprises a valve housing including a flow channel passing through the valve housing, and a closure member arranged at least partially in the flow channel and reversibly transferable between an open position and a closed position such as to open or close the flow channel through the valve housing. The valve further comprises a non-electrically driven actuator mechanism operatively coupled to the closure member for transferring the closure member at least from the open position in the closed position. The actuator mechanism is configured to be activated by a fluid flow through the flow channel reaching or exceeding a switching temperature and/or switching flow rate during operation. In addition, the valve comprises at least one position indicator to indicate whether the closure member is in the open position or in the closed position. The position indicator comprises at least one indicator member movably arranged in or at the valve housing between a first position and a second position, wherein the indicator member is magnetically coupled to the closure member such that the indicator member is magnetically transferred into the first position when the closure member is transferred into the open position, and into the second position when the closure member is transferred into the closed position.

A method for measuring the hardware and operational state of a dual-circuit solenoid valve including first and second coaxial coils each associated with a circuit is disclosed. The method includes the steps of injecting a sinusoidal current into the first coil; measuring the voltage induced across the terminals of the second coil; and plotting at least one curve of a first magnitude proportional to the measured induced voltage as a function of a second magnitude proportional to the injected sinusoidal current.