The invention relates to an air flow control device for inflatable objects (20) comprising a hermetic air chamber (10) arranged for being connected to an air pump (12); a printed circuit board (22A, 22B) that can be connected to a power source, the printed circuit board (22A, 22B) forming a surface limiting a face of the hermetic air chamber (10) and having at least one hole (26). The device also comprises at least one solenoid valve (14) connected on the printed circuit board (22A, 22B), covering the hole (26), and the solenoid valve comprising: a casing (28); an outer coil (30); a fixed inner metal cylinder (32); a nozzle (18) for connecting the inside of the solenoid valve (14) to the inflatable object (20); a rod (16) having a rubber tip and a spring.

Pressure control systems and methods are provided that aid in the control of fluidic or pneumatic devices, by improving the ability to control pressure independently and simultaneously on multiple channels, which in turn permits pressure changes on the channels to occur more quickly and more precisely. In order to match rise/fall times between steps on different channels that may be of different magnitudes, various embodiments slow down fast steps such that they match the default rate of slower steps, such as by using a step partitioning method or breaking a single step into substeps with a pause inserted between substeps of necessary duration such that the complete step time matches the target step time. The provided systems and methods may utilize a combination of proportional-integral-derivative (PID) control loop and discrete pressure steps to achieve faster, more accurate control over pressure rises and pressure falls.

The present application is directed to a manifold system for low pressure and high pressure fluids. The manifold system may include one or more manifold sub-assemblies that may be assembled together, separated apart and replaced as desired. In oil and gas hydraulic fracturing operations, each manifold sub-assembly includes two or more low pressure fluid lines and two or more high pressure fluid lines for fluidly communicating with hydraulic fracturing pumps. High pressure fluid may exit the manifold system via a single line or multiple lines.

The present invention is a fluid distribution system comprising connected conduits (e.g., lines) wherein fluid flows, such as pipes within a building. The lines may be configured to: (i) include multiple lines that connect at intersections (some of the intersections will be identified as nodes); and (ii) incorporate node units associated with line pressure loss simulation assemblies (LLSAs). Activities of a node unit incorporating a LLSA can result in alterations in fluid pressure, such as by a loop control process to reposition balancing valves or other valves of one or more LLSAs, and/or by alteration of the speed of the system pump. These activities adjust fluid pressure to cause the system to produce a balanced and high efficiency energy transfer (e.g., heating or cooling), and do not involve or require any identification or use of any specific, fixed or absolute pressure value. They function based on an operation locus (for a node unit) and/or an operation locus range (for node unit groupings) to adjust the fluid pressure.

A system for controlling operation of a hydraulic valve is provided. The system includes a solenoid coupled to a spool assembly of the hydraulic valve. The system further includes a sensor disposed on the hydraulic valve. The sensor generates signals indicative of operational parameter of the hydraulic valve. The system also includes a controller in communication with the solenoid and the sensor. The controller receives signals generated by the sensor. The controller includes a booster circuit connected to the solenoid. The booster circuit boosts an actuating current generated in response to the signals received from the sensor. The controller further includes a switching circuit connected across the solenoid. The switching circuit controls a direction of the actuating current flowing through the solenoid. The solenoid actuates the spool assembly of the hydraulic valve to control the operation of the hydraulic valve based on the actuating current.

Methods and apparatus for controlling gas flow to a process chamber are disclosed herein. In some embodiments, a processing system includes a first process chamber having a first gas input; a first gas break disposed upstream of the first gas input; a first adjustable valve disposed upstream of the first gas break; and a first isolation valve disposed upstream of the first adjustable valve. The processing system may further include a second process chamber having a second gas input; a second gas break disposed upstream of the second gas input; a second adjustable valve disposed upstream of the second gas break; and a second isolation valve disposed upstream of the second adjustable valve. A shared gas source may be disposed upstream of the first isolation valve and the second isolation valve to provide one or more gases to the first process chamber and to the second process chamber.