An adjustable rotary flow valve, comprising: a body; an upstream port; a downstream port; a rotary disc comprising a water flow opening; a rotating mechanism couple with the rotary disc and configured to move the water flow opening past a plurality of channels in a flow of water from the downstream port to the upstream port so as to variably restrict the flow; dial graduations that illustrate a plurality of flow percentage; and a dial couple with the rotating mechanism and configured to illustrate via the dial graduations the current flow percentage based on a position of the rotary disc.

A hub, sight glass column and bottom sediment and water bowl are described. The hub is adapted to interconnect multiple machine fluid equipment to a single port on a machine. The hub is provided with an adjustable fitting connectable to a housing, and recessed within the hub. The sight glass column is configured to be indirectly attachable to a machine via a machine connector such that machine fluid is transferable from the machine to the sight glass column. The sight glass column further has a remote sensing port, and a lockable oil level ring. The bottom sediment and water bowl has a conically shaped bottom to direct fluid to a drain valve, and an indicator located on an upper tip of the drain valve. The indicator is configured to provide information with respect to one or more contaminant or property of machine fluid within the bottom sediment and water bowl.

A low-flow alarm optionally having a variable pressure pre-set threshold, for use with protective suits and hoods is disclosed. In one embodiment, a low-flow valve alarm comprises an adjustable spindle handwheel having a hole, a valve body having an air inlet port, the valve body connected with the adjustable spindle handwheel, a hollow handwheel body joined to the adjustable spindle handwheel, a diaphragm sealing collar joined to a whistlehead retaining body, the whistlehead retaining body having a central bore and joined with a whistlehead, a resilient diaphragm joined with a control spindle disposed within the central bore of the whistlehead retaining body, the control spindle having an air channel, wherein air can travel through the air channel, wherein air flow is adapted to act on the resilient diaphragm, compressing a spring and wherein a low air pressure condition relaxes compression on the spring, producing an audible alarm.

An instruction duty computation unit computes an instruction duty ratio representing a ratio between an energization time and a non-energization time of a motor based on an actual rotation angle detected by a rotation angle sensor and a target rotation angle of a valve member. The rotation angle sensor detects an actual rotation angle of a valve member of a fluid control valve. A stress computation unit computes a valve member load torque of the valve member based on the actual rotation angle and an actual duty ratio of the motor. An actual duty computation unit computes a new value of the actual duty ratio based on an instruction duty ratio computed by using an instruction duty computation unit and a valve member load torque computed by using a stress computation unit.

A method is proposed for establishing termination criteria for a partial stroke test on a safety valve, including: a) A partial stroke test is carried out when the safety valve is operational. b) Position of the valve member and pressure in the drive fluid are recorded. c) A first relation is derived, which relates position of the valve member, time, pressure of the drive fluid, and/or control deviation to one another. d) This relation is defined as a safety valve reference curve. e) A second relation is defined, which has a predetermined distance from the reference curve. f) Termination criterion include: If the partial stroke test is repeated on the same valve, the same data are recorded and a third relation is derived for the reference curve, the partial stroke test is not passed if the third relation has a greater distance to the reference curve than the second relation.

A test device and a test method for dynamic characteristics of a spring-loaded safety valve are mainly used for testing opening, emission and return seat characteristics of the safety valve. The air pressure stabilizer is used for stably adjusting gas pressure in a pressure vessel. The quick start and stop device is used for controlling opening and closing of the pressure vessel. The pipeline gas mass flow detecting device is used for detecting the mass flow of the gas in a pipeline. The safety valve stem displacement detecting device is used for detecting the displacement change of a safety valve stem. The acquisition system is used for collecting, processing and saving experimental data. The device of the present invention has simple structure and high precision, and provides guarantee for the test of the dynamic characteristics of the safety valve.

An adaptive flow limit controller for controlling a flow rate of a fluid through a heat exchanger includes a processing circuit. The processing circuit is configured to use an adaptive model to determine a threshold flow rate of the fluid through the heat exchanger at which a gradient of a temperature difference of the fluid across the heat exchanger with respect to the flow rate of the fluid through the heat exchanger has a threshold gradient value. The processing circuit is configured to operate a flow control device to maintain the flow rate of the fluid of through the heat exchanger at less than or equal to the threshold flow rate.

Rotary valve systems with integrated sensors are described that facilitate stabilizing electrical connection from a valve actuator. A valve system embodiment includes, but is not limited to, a multi-port rotary valve; an actuator attached to the multi-port rotary valve, wherein the actuator comprises a power connection fed from electronics associated with the actuator; an actuator cap attached to the actuator, the actuator cap configured to allow the power connection to pass through; a valve collar with an integrated press-on connector, wherein the valve collar comprises an electronic feedthrough passage for the power connection; and a retainer portion comprising two retainer pins, wherein the two retainer pins are configured to mate with apertures on the actuator cap, the retainer portion configured to allow electrical connection between the power connector and a sensor connector when the two retainer pins fit within the two apertures on the actuator cap.

A gate valve for controlling a flow of a fluid. The gate valve includes a valve body with a first seat pocket and a flow bore, a gate which is movable so as to intersect the flow bore, a seat with a gate end and a body end, a plate with an opening which is positionable on the seat at the gate end, and a plate retainer which is positionable between the seat and the plate so as to prevent an axial movement between the seat and the plate with respect to an axis of the flow bore. The flow bore extends through the valve body for the flow of the fluid. The gate end is arranged to face the gate, and the body end is positionable within the first seat pocket of the valve body.

Data retrieval, event recording and transmission module connectable to safety and relief valves. The module (10) coupled to safety or relief valves for the measurement, transmission and recording of events and includes a rigid and inextensible at room temperature longitudinal element defining an acoustic emission waveguide (12) that transmits vibrations. The end (12a) of (12) is in intimate contact with a portion (2) or (1) of the valve, and its other end (12b) penetrates inside a closed resistant box (10), wherein it sits in contact against at least one acoustic emission sensor (13) receiving a signal proportional to the vibrations transmitted by the waveguide (12).