Some embodiments provide irrigation generator systems that include a main conduit comprising an inlet conduit and an outlet conduit; a flow control system positioned within the main conduit; a generator conduit comprising a generator inlet conduit and a generator outlet conduit, wherein the generator inlet conduit is fluidly coupled with the main conduit upstream of the flow control system, the generator outlet conduit is fluidly coupled with the main conduit downstream of the flow control system; and a generator comprising a rotor assembly cooperated with generator conduit to be physically activated by a flow of fluid through the generator conduit causing rotation of the rotor assembly and generates electrical power. The flow control system transitions between a closed state to the open state in response to a water pressure exceeding a pressure threshold.

A fluid-control device comprises a stack of wafers in which flow components are provided as micro-electro-mechanical systemsMEMS. The flow components are selected from fluid-control components and/or fluid-monitor components. The fluid-control device has a first flow component that is encircled, in a main plane of the stack of wafers, by a second flow component.

Example split valves for regulating a first flowrate and a second flowrate of a fluid within a closed loop systems are disclosed herein. An example split valve includes an electrohydraulic servo valve coupled to a first piston via a first hydraulic flowline and a second hydraulic flowline, the first piston to include a piston shaft, a first head, and a second head; one or more bellows fixed to at least one of the first head or the second head, the one or more bellows to hermetically seal the fluid from a hydraulic fluid; and a control system connected to the electrohydraulic servo valve, the control system to adjust the first flowrate and the second flowrate of the fluid through a first fluid chamber, the first piston to be located in the first fluid chamber.

Universal control circuitry for an electro-hydraulic valve actuator system includes logic gate circuitry to control one or more of a closing solenoid valve, an opening solenoid valve, an emergency shutdown solenoid valve, and a hydraulic fluid pump motor to route hydraulic fluid through a hydraulic circuit to actuate a valve via a hydraulic actuator according to received commands. The universal control circuitry is configured to control operation for multiple different configurations of a hydraulic valve actuator system including double-acting configurations, single-acting spring-to-open configurations, and single-acting spring-to-close configurations, each with or without an emergency shutdown arrangement (which may be configured to trip based on an external shutdown input alone or in combination with a local system power failure), a hydraulic accumulator, and maintained or momentary input commands.

Precision in proportional operation of pinch valves along an application-specific path of opening and/or of closing is provided in proportionally controlled pinch valves, systems and methods. Included is the advantageous feature that pinch valves and pinch valve controlling systems and methods can be enhanced by carefully controlling not only two primary operational positionseither fully open or fully closedbut also in-between positions as are required for an application of a user of the pinch valve. The effect on the fluid flowing through tubing that is engaged by the pinch valve head between fully open and fully closed is considered, determined and used to achieve pinch valve operation that is linear in flow change and/or linear in pressure change along the closing path and/or opening path through the tubing. The pinch valves can include a normally closed port that opens when the system experiences a shut-down condition.

An electropneumatic proportional flow control device improves electropneumatic control of pneumatically operated valves. Improved turn down ratios in regards to the electromagnetic response of the device to a supplied control voltage is achieved using two variable spring devices, one linear, as part of the pressure regulator valve component, and the other non-linear, as part of the proportional valve component and which are magnetically responsive to different magnetic forces. The use of both the linear and non-linear springs together results in an increased turndown-ratio, especially during initial valve control.

Switching valve for controlling a mass flow in a cold or hot circuit. The valve includes a valve housing having a feed opening and a discharge opening; a valve piston which has a valve-closure member directed towards the discharge opening and which, in a closed position, abuts a valve seat of a through-bore between the feed opening and the discharge opening; a pilot valve having a pilot bore in the valve piston, which bore opens into the through-bore and traverses the valve piston; a path-generating device having an actuatable ram accommodating a closure member which closes the pilot bore and, with the closure member, can be moved into an opening position which opens the pilot bore; and a bypass duct formed between the feed opening and the pilot bore. At least one connection element forcibly transfers at least some of the stroke movement of the ram onto the valve piston.

A water management system includes a demand response controller. The demand response controller configured to receive a demand response signal that specifies a reduction in electrical power consumption by a water utility. The demand response controller is also configured to select a point of use device (PUD) to implement a reduction in water consumption responsive to the demand response signal. The demand response controller is further configured to transmit, to the PUD, a control signal that specifies a reduction in water flow controlled by the PUD.

Apparatuses for controlling gas flow are important components for delivering process gases for semiconductor fabrication. In one embodiment, a method of calibrating an apparatus for controlling gas flow is disclosed. Specifically, the apparatus may be calibrated on installation using a two-step process of measuring the volume of gas box downstream from the apparatus by flowing nitrogen gas into the gas box and measuring the resulting temperature and rate of pressure rise. Using the computed volume of the gas box, a sweep of several mass flow rates may be performed using the process gas and the gas map for the process gas. The apparatus is calibrated based on the measured temperature and pressure values, which allow calculation of the actual mass flow rate for the process gas as compared with the commanded mass flow rates.

Pressure independent flow rate control valve, for placement in hydraulic systems between upstream inlet and downstream outlet ducts, including a first functional unit arranged between the inlet and outlet ducts, mobile equipment actuated manually or by an actuator for setting and modifying the orifice span of a fluid passage, and thus the valve flow rate, up to complete closure; and a second functional unit for maintaining the differential pressure constant between upstream and downstream of the first unit, and thus the set valve flow rate independently of pressure fluctuations in the hydraulic system. The mobile equipment includes main equipment and secondary equipment which can linearly translate with respect to the main equipment for presetting the maximum valve flow rate, the main equipment carrying integrally the secondary equipment and being linearly displaced by the actuator for modulating the fluid flow rate from the preset maximum one up to complete closure.