14849results about "Safety valves" patented technology

Methods and apparatus for calibrating a plurality of gas flows in a substrate processing system are provided herein. In some embodiments, a substrate processing system may include a cluster tool comprising a first process chamber and a second process chamber coupled to a central vacuum transfer chamber; a first flow controller to provide a process gas to the first process chamber; a second flow controller to provide the process gas to the second process chamber; a mass flow verifier to verify a flow rate from each of the first and second flow controllers; a first conduit to selectively couple the first flow controller to the mass flow verifier; and a second conduit to selectively couple the second flow controller to the mass flow verifier.

A gas supply subsystem for providing a set of process gases to a substrate processing chamber, the set of process gases being a subset of a plurality of process gases available to the substrate processing chamber. The gas supply subsystem has fewer multi-gas mass flow controllers than the number of available process gases, wherein multiple process gases are multiplexed at the input of one or more of the multi-gas mass flow controllers. Pump-purge may be employed to improve gas switching speed for the multi-gas mass flow controllers

A valve apparatus for medical applications, comprises a flexible member extending across a lumen through which a flow of materials is to be controlled. The flexible member includes a plurality of movable elements formed on opposite sides of a slit extending through the flexible member. The moveable members are biased so that when a pressure less than a predetermined threshold value is applied to the flexible member, the moveable elements are maintained in a closed position in which no flow is permitted past the flexible member and, when a pressure at least as great as the threshold value is applied to the flexible member, the moveable elements are moved to an open position separated from one another along the slit permitting flow through the lumen.

A method and apparatus for an automated biological reaction system is provided. In the processing of a biological reaction system, there is a need for consistently placing an amount of fluid on a slide. In order to accomplish this, several methods are used including a consistency pulse and a volume adjust means. Moreover, in order to reliably operate an automated biological reaction system, the dispenser must be reliable, easy to assemble and accurate. Among other things, in order to accomplish this, the dispense chamber is substantially in line with the reservoir chamber, the reservoir chamber piston is removed, and the flow of fluid through the dispenser is simplified. Further, in order to operate the automated biological reaction system more reliably, the system is designed in modular pieces with higher functions performed by a host device and the execution of the staining operations performed by remote devices. Also, to reliably catalog data which is used by the automated biological reaction system, data is loaded to a memory device, which in turn is used by the operator to update the operator's databases. The generation of the sequence of steps for the automated biological reaction device based on data loaded by the operator, including checks to determine the ability to complete the run, is provided.

A plurality of receptacles in an irrigation controller removably receive a plurality of modules. At least one station module is configured for insertion into a first one of the receptacles and is connectable to a corresponding solenoid actuated valve through a dedicated field valve line and common return line. The station module includes at least one switching device for selectvely providing a first power signal that energizes the corresponding solenoid actuated valve. At least one encoder module is configured for insertioninto a second one of the receptacles and is connectable to a multi-wire path for sending encoded signals and a second power signal along the multi-wire path for selectively energizing one of a plurality of solenoid actuated valves connected to corresponding decoder circuits connected along the multi-wire path. A processor executes the stored watering program and controls the station module and/or the encoder module in accordance with the stored watering program.

A two-wire controlling and monitoring system for in particular irrigation of localized areas of soil according to a aspect of the invention comprises a water pipeline, a first plurality of controllable irrigation valves, a second plurality of field sensors measuring specific irrigation parameters, and a third plurality of localized irrigation control units. The third plurality of localized irrigation control units each comprises a sensor decoder connected to a specific field sensor of the second plurality of field sensors and/or a line decoder connected to a specific controllable irrigation valve of the first plurality of controllable irrigation valves. The two-wire controlling and monitoring system further comprises a controller and power supply unit having a set of schedules of instructions and supplying power by applying a first alternating DC voltage signal to a two-wire cable interconnecting the controller and power supply unit and the third plurality of localized irrigation control units. The two-wire cable provides the power from the controller and power supply unit to each of the third plurality of localized irrigation control units. The controller and power supply unit transmits the schedules of instructions to the third plurality of localized irrigation control units through the two-wire cable and receives the specific irrigation parameters from the third plurality of localized irrigation control units through the two-wire cable.

This invention provides microfluidic devices that comprise a fluidics layer having microfluidic channels and one or more regulating layers that regulate the movement of fluid in the channels. The microfluidic devices can be used to mix one or more fluids. At least a portion of the fluidics layer can be isolated from the regulating layer, for example in the form of a shelf. Such isolated portions can be used as areas in which the temperature of liquids is controlled. Also provided are instruments including thermal control devices into which the microfluidic device is engaged so that the thermal control device controls temperature in the isolated portion, and a movable magnetic assembly including magnets with shields so that a focused magnetic field can be applied to or withdrawn from the isolated portion or any other portion of the microfluidic device. Also provided are methods of mixing fluids. The methods include stacking a plurality of alternating boluses of different liquids in a microfluidic channel, and moving the stacked boluses through the channel. In another method, the boluses are moved into a diaphragm valve having a volume able to accommodate several boluses, and then pumping the liquids out of the valve.

Valve guide and spring retainer assemblies are described for use in plunger pump housings that incorporate structural features for stress-relief. These pump housing structural features accommodate correspondingly-shaped valve guides and/or spring retainers that are internally fixed in place using one or more non-threaded spacers. Plunger pumps so constructed are relatively resistant to fatigue failure because of stress reductions, and they may incorporate a variety of valve styles, including top and lower stem-guided valves and crow-foot-guided valves, in easily-maintained configurations. Besides securing valve guides and/or spring retainers, non-threaded spacers may be shaped and dimensioned to aid in further reducing stress and to improve volumetric efficiency of the pumps in which they are used.

Disclosed is a fastener driving apparatus for driving fasteners into a substrate. The fastener driving apparatus is a combination of a motor driven linear motion converter; a compression cylinder; an expansion cylinder and a valve arrangement. The linear motion converter converts a rotational motion of a motor to a linear motion of a compression piston within the compression cylinder causing a gas within the compression cylinder to be compressed. The compressed gas is communicated to the expansion cylinder through the valve arrangement wherein the compressed gas expands causing an anvil coupled to an expansion piston within the expansion cylinder to move axially. The axial movement of the anvil causes a fastener to be driven into the substrate. The fastener driving apparatus is an ergonomically designed portable hand held tool providing comfort to a user, meeting safety standards and performance efficiency requirements.

A system for monitoring and controlling one or more utility systems includes a utility system main supply line for supplying a utility to at least one of a structure, an area and a building and a controlled shut-off device on the utility system main supply line. The controlled shut-off device is bias toward an open position and is movable toward a closed position upon receipt of an actuation signal wherein the utility is prevented from passing by the controlled shut-off device. A main utility sensor is on the utility system main supply line and a motion sensor that detects occupancy is in the building. A processor communicates with the controlled shut-off device, the main utility sensor and the motion sensor. The processor sends the actuation signal to the controlled shut-off device to move the controlled shut-off device toward the closed position when input from the main utility sensor and the motion sensor indicates occurrence of an abnormal event.

A check valve which is positioned in the vacuum air line of an internal combustion engine. The check valve includes a single-piece valve body having an outlet port and two or more inlet ports, with one outlet port located substantially in line with the inlet port and connected by a venturi tube. The second inlet port is separated from the main air flow line by the valve stem and a diaphragm which allows communication there between and prevents back pressure. The second inlet port communicates with the outlet port through the valve stem and a second venturi tube which provides a vacuum boost to a device, usually vehicle brakes, connected to the inlet. The use of seal diaphragms having a non-constant radius allows for faster recovery time for replenishment than prior art devices.

A pressure support system that includes a first housing member and a second housing member. The first housing member has a first plurality of cavities defined therein, and the second housing member has a second plurality of cavities defined therein. The first and second plurality of cavities cooperate to define (a) a first chamber adapted to receive a first component of the pressure support system, (b) a second chamber adapted to receive a second component of the pressure support system, and (c) a first conduit connecting the first component and the second in fluid communication when the first and second housing members are assembled. A fastening system secures the first and second housing members in an assembled relation.

A reductant delivery unit (10) is provided for selective catalytic reduction (SCR) after-treatment for vehicles. The unit includes a solenoid fluid injector (10) constructed and arranged to be associated with an exhaust gas flow path (14) upstream of a SCR catalytic converter (17). The fluid injector has a fluid inlet (13) and a fluid outlet (15) with the fluid inlet being constructed and arranged to receive a source of urea solution and the fluid outlet being constructed and arranged to communicate directly with the exhaust flow path so as to control injection of urea solution into the exhaust gas flow path. An interface (24) is constructed and arranged to couple the fluid injector to the gas flow path. The interface defines a thermal barrier constructed and arranged to decoupled a body of the injector from exposure to heat in the exhaust gas flow path.