152 results about "Pressure cycle" patented technology

One of the most significant safety concerns in the automation of extracorporeal blood treatments such as dialysis is the risk of blood leakage. Such systems draw blood at such a high rate that a loss of integrity in the blood circuit can be catastrophic. The most reliable leak detection method known is the detection of infiltrated air in the blood line, but this only works in blood lines under negative pressure. According to the invention, a leak detector for return lines is provided by periodically generating a negative pressure, which may be brief or at a 50% duty cycle, in the blood return line to draw air into it and thereby reveal the leaks using an air sensor. Although the return line is ordinarily under positive pressure, during the negative pressure cycle, the blood return line draws air through any leaks or disconnects. If air is detected, the system is shut down and an alarm generated.

The multiple interventionless actuated downhole valve includes a valve movable between an open and a closed position to control communication between an annular region surrounding the valve and an internal bore and more specifically controlling communication between above and below the valve, and at least two remotely operated interventionless actuators in operational connection with the valve, wherein each of the interventionless actuators may be operated independently by absolute tubing pressure, absolute annulus pressure, differential pressure from the tubing to the annulus, differential pressure between the annulus and the tubing, tubing or annulus multiple pressure cycles, pressure pulses, acoustic telemetry, electromagnetic telemetry or other types of wireless telemetry to change the position of the valve and allowing the valve to be continually operated by mechanical apparatus.

A flapper valve preferably used in injection application in deep subterranean locations has an actuating sleeve with a seat to accept an object. A j-slot connects the actuation sleeve movement to the housing so that with an object on the seat and an applied pressure cycle the sleeve moves the flapper to the open position. The plug is dissolved and the injection begins. The plug can have an opening so as to allow continuous injection flow as the flapper is operated. Closing the flapper involves a second object on the same seat and a pressure cycle so that a spring can push the sleeve away from the flapper to allow a torsion spring on the flapper to close it.

An in situ cleaning system is disclosed for use with semiconductor processing equipment. In accordance with an important aspect of the invention, the cleaning system provides for dynamic cleaning of the semiconductor processing system by varying the pressure of the cleaning gas over time during a cleaning cycle. In particular, the cleaning gas is applied to the semiconductor processing system in repeated pressure cycles. Each pressure cycle begins with the pressure of the cleaning gas at P_MIN. The pressure of the cleaning gas is increased to a maximum pressure P_MAX during a fill portion of the pressure cycle and maintained for a dwell time selected to allow the available reactants to generate the desired end products. The pressure in the chamber to be cleaned is then reduced during a vent portion of the pressure cycle to permit venting of the reaction products. As such, each time the chamber to be filled is vented and re-filled, reaction products are removed and new reactants are introduced into the chamber to be cleaned, increasing the effective reaction rate.

This invention provides systems and methods of supplying oxygen-enriched air to an enclosed space or compartment. The systems and methods may distill oxygen from ambient air by a molecular sieve pressure cycle mechanism, such as a pressure swing absorption, may generate oxygen from water using electricity or may use oxygen enriched air produced by membrane filtration. The invention helps people improve their wellness, productivity and comfort, improve performance of mental and/or physical tasks, increase their alertness, quality of life and pleasure, reduce their drowsiness, and aid in curing and preventing disease by increasing the percentage of oxygen in the enclosed space to a beneficial and safe level.

A modular pressure operated actuator can be coupled with a downhole tool to selectively operate it at least once. In the preferred embodiment the module can be mounted adjacent an isolation valve and after a fixed number of on and off pressure cycles allow a spring to push an actuator to operate the valve to an open position. The actuator, in another embodiment, can be reset with a tool run into the module to move the actuator back against a power spring and hold that spring force until the pressure cycling begins again. The preferred application is for a formation isolation ball valve but other valves, such as sliding sleeves, or other types of downhole tools can be actuated with the module that permits a retrofit of a hydraulic operation to a heretofore purely mechanically actuated tool.

A dual area pressure pulmonary modulator apparatus which provides constant flow, pressure cycled ventilatory support to patients that is additionally equipped with fluid conduits in the valve mechanism and body that allow the clinician or user to manually actuate inhalation by occluding a fluid path emanating from the modulator. Such feature is useful for when the device stops cycling due to physiological changes of the patient, for determining if the patient is cycling the device or if the device is automatically cycling by nature of its setting, coordinating medical procedures with the breathing of the patient, increasing the PEEP beyond the intrinsic design PEEP of the device for a given PIP setting, increasing inspiratory hold time, and providing an easy to use alternative mode of operation for users with less sophistication.

The invention discloses a low-temperature pressure cycle life testing method and system. According to a typical embodiment in the invention, a vibration generator and a bellows assembly are respectively used as a power supply and a driving element; a driving part of the bellows assembly is connected with a moving part of the vibration generator through a driving assembly; an enclosed liquid chamber filled with an incompressible low temperature fluid medium and an enclosed gas chamber filled with a compressible low temperature fluid medium are formed by separate cooperation among the bellows assembly, a pressure testing joint pipe, a diaphragm capsule, etc.; and the driving part of the bellows assembly stretches out and draws back under the driving of movement of the moving part of the vibration generator, so a liquid in the liquid chamber extrudes the diaphragm capsule so as to form pressure fluctuation. The system provided by the invention has a simple structure, has low assembling and maintenance cost, is easy to operate and can conveniently adapt to different pressure fluctuation amplitudes and frequencies by adjusting the output displacement and frequency of a vibrating table, thereby guaranteeing high control precision of pressure fluctuation.

The invention discloses a pressure circulation service life testing system and method. According to the typical embodiment, a vibrating platform is provided as a power source, a hydraulic cylinder is provided as a transmission element, a piston is arranged in the hydraulic cylinder, the piston is in transmission connection with a moving component of the vibrating platform through a piston rod, air is filled into a hydraulic cylinder inner cavity located on one side, close to the vibrating platform, of the piston, a hydraulic cylinder inner cavity located on the other side of the piston is communicated with an accumulator liquid cavity, and water is filled into the hydraulic cylinder inner cavity located on the other side of the piston and into the accumulator liquid cavity. The vibrating platform is started, through motion of the moving component of the vibrating platform, water filled into the hydraulic cylinder and the accumulator liquid cavity is made to extrude an accumulator air cavity to form pressure fluctuation. The pressure circulation service life testing system can adapt to different pressure fluctuation amplitudes and frequencies conveniently by adjusting the output displacement and the frequency of the vibrating platform, so that high control precision of the pressure fluctuation is guaranteed, and the system is simple in structure, low in assembly and maintenance cost and easy to operate.

The invention relates to an improvement of wetting method of lithium-ion battery liquid injection, characterized in that negative pressure wetting is negative pressure cycle changed wetting in -0.1MPa to -0.02MPa vacuum. Electrical core absorbs electrolyte wetly, uniformly and quickly because of using cycle changed negative pressure, the battery reaches liquid injection requirement only 12 to 15 minutes when the flexible packaging is 2000 mA, the time of liquid injection wetting is saved about 1/2 compared with the time of original constant negative pressure wetting, and consistency of internal resistance and capacity of battery is improved greatly, the consistency can improve at least about 10 percent compared with the original technology wetting. In addition, the realizing way of changing negative pressure circularly is simple, and need not increase equipment investment basically, and has low use-cost, and is easy to implement.

A downhole valve features a flow port that can be selectively obstructed by a pressure actuated sleeve that is movable in a pin and slot mechanism to rotate while being cycled up and down by application and removal of pressure in a cyclical manner. When the sleeve is cycled to the port closed position, a flapper mounted near its upper end can fall on a seat on the sleeve to allow pressure to be applied to the flapper and sleeve, causing the sleeve to move to a position that will prevent fluid loss from the tubular string into the formation. The Closed flapper allows pressure cycles of the sleeve. A double closure against fluid loss can be affected.