23008 results about "Check valve" patented technology

A dry powder inhaler having improved aerodynamic properties for diluting, dispersing, and metering drug particles for increasing the efficiency of pulmonary drug delivery to a patient is described. The inhaler comprises, in general, a housing having an air intake, an air flow-control / check-valve, a mixing section and a mouthpiece. A cartridge loaded with a single dose of medicament can be installed in the mixing section.

A prosthetic socket having a self-contained vacuum reservoir chamber includes a rigid, load-bearing inner socket member for receiving a residual limb and an outer, rigid, load-bearing wall section attached to the inner wall section in a manner providing a vacuum reservoir chamber between the inner wall and the outer wall section. The vacuum reservoir chamber communicates with the inner volume of the inner wall through a vacuum transfer port and the vacuum reservoir chamber may be evacuated via an evacuation port having an appropriate one-way check valve permitting withdrawal of air from the vacuum reservoir chamber while preventing ingress of air into the chamber. A method for making the prosthetic socket is disclosed.

A canister filling system is provided for independently filling multiple canisters from a common set of storage stations prioritized in a cascaded manner. The system includes first and second fill stations configured to receive and independently fill canisters with pressurized gas. First and second storage stations store gas at corresponding first and second charge pressures, respectively. A supply-chain joins each of the first and second fill stations to both of the first and second storage stations. First and second valve assemblies are provided in the supply-chain to monitor, independent of one another, the canister pressures at the corresponding first and second fill stations. The canister pressures represent the pressure within corresponding canisters. The first and second valve assemblies automatically open and close to permit and prevent discharge of gas from the first and second storage stations, independent of one another, to automatically switch between the first and second storage stations based on the canister pressures. In one embodiment, the valve assembly includes a combination of sequence valves and check valves. Alternatively, the valve assembly may be controlled by electronic sensors and electronic solenoids. The electronic sensors detect the canister pressures and the charge pressures at the storage stations. The electronic solenoids open and close the valves based on the sensed canister pressures.

An infusion rate adjusting device for drug solution injectors comprises a tubular flow control unit including plural check valves of different opening pressures, and means for selecting one of said check valves to adjust an infusion rate of the drug solution. The infusion rate adjusting device is simple in operation to set out an infusion rate of the drug solution and is considerably reduced in the production cost.

A gravel packing method and apparatus allows setting the packer by dropping a ball to a seat that it isolated from the effects of formation pressures when trying to set the packer. This is accomplished by isolation of the gravel pack outlet port when setting the packer and locating the ball seat in a position where the effects of formation pressure are irrelevant. Additionally, by positioning the evacuation ports above a seal bore in the screen extension during circulation or squeeze to deposit gravel and further putting check valves in the evacuation ports, the evacuation step after circulation or squeeze can be accomplished without having to reposition the crossover. The crossover is supported from the packer and movement of the crossover away and back to the support from the packer operates a valve to allow squeezing when the valve is closed and circulating and reversing out when the valve is open. Thus, the gravel pack method and apparatus facilitates circulation, squeeze and reverse circulation in a single supported position.

A check valve for medical infusion lines and the like, includes a diaphragm made of elastic material set between a first tubular connector and a second tubular connector. The diaphragm includes an end wall of a cup-shaped element, having an outer peripheral edge of which is normally pressed in seal contact against an annular valve seat with a conical surface of the first tubular connector under an axial thrust exerted by a side wall of the cup-shaped element. A free edge of the side wall of the cup-shaped element is set resting against a transverse surface of the second tubular connector only in regions corresponding to angular portions of the latter separated by non-resting angular portions.

A beverage forming apparatus includes a storage tank, and a centrifugal pump having an inlet connected to the storage tank by a supply conduit. The centrifugal pump may include a priming vent located below a full level of the storage tank and permit air to vent as liquid primes the pump. A metering tank may have an inlet connected to the centrifugal pump by a pump conduit, and an outlet connected to a brew chamber that forms a beverage using liquid received from the metering tank. In one embodiment, a flow control valve, such as a check valve, may be provided in the pump conduit to allow flow from the pump to the metering tank, but resist flow in reverse. In another embodiment, a vent valve in the pump conduit may be arranged to vent at least a portion of the pump conduit, e.g., to ambient air pressure.