829 results about "Flap valve" patented technology

Described herein are nasal respiratory devices and methods for treating a variety of medical diseases including snoring and sleep apnea through the use of such devices. In general, these devices include an airflow resistor, such as a flap valve and a holdfast for securing the device in communication with the subject's nasal cavity. The devices may be configured to include leak paths to regulate the expiratory pressure when worn by a subject. Methods for using these devices may include securing a device over or at least partially within (or both of) a subject's nasal cavities.

A prosthetic valve in the form of a flap valve which includes one or more flaps arranged to allow movement of liquid through the valve only in one direction, in which the or each flap is made of a flexible open work structure of a medically acceptable metal such as titanium or a titanium alloy.

A fuel tank opening-closing device includes a flap valve mechanism situated inside a tank opening forming member and having a flap valve mechanism; and an opening-closing activation mechanism adapted to selectively set the flap valve mechanism to a locked position or an unlocked position. The opening-closing activation mechanism includes a cover covering the peripheral edge portion of the opening-closing member and having a cover body produced by being split into arcuate shapes of prescribed width; a nozzle detection mechanism having introductory push parts that are adapted to receive force of motion in the insertion direction by a fueling nozzle; locking members which engage or disengage from the opening-closing member; and a locking mechanism having and adapted to move the locking members from the locked position to the unlocked position through interlocking operation with the introductory push parts.

An infusion beverage brewing system includes a container and an infuser. The infuser is positioned in a liquid, such as hot water, and has an infusing chamber for containing infusible materials, such as tea leaves. A plunger includes a piston with a peripheral seal and flap valves. After a brewing time has elapsed, an individual pushes on an operator to move the piston past a perforated wall portion of the infusing chamber. When the piston reaches a solid wall portion at the bottom of the infusing chamber, the flap valves open to allow liquid to escape. However, small apertures aligned with the flap valves prevent the passage of the infusible material. Consequently the infusible material is isolated from the liquid when the piston reaches a solid bottom wall portion of the infusing chamber.

A shoe pad includes air pumping elements for cooling the interior of a shoe. The pumping elements include forward pumping elements for pumping air from back to front, and backward pumping elements for pumping air from front to back. The pad includes an upper sheet attached to a lower sheet. Each pumping element includes a channel on the lower sheet covered by the upper sheet. The channel has an intake and an exhaust. Cavities are distributed along the channel. Resilient blisters on the upper sheet are aligned with the cavities on the lower sheet to define pumps. Each pump has an intake and an exhaust. Flap valves projecting down from the upper sheet are respectively positioned against the intakes of the pumps. Alignment pins projecting down from the top sheet are positioned in alignment holes on the lower sheet.

The integrated deep sea sediment sampling and holding device includes sampling mechanism comprising weight mechanism, hoisting mechanism, sampling and holding barrel, energy accumulator and tongue mechanism; and sealing bin comprising bin body, flap valve, lower end cap, lower gland and turned cone. It has combined sampling and pressure holding barrel with sealed upper and lower ends, compact structure, relaxed hoisting requirement, and raised pressure and bending strength of the barrel. The device can sample sea bed sediment as well as water, gas, natural gas, etc., and hold the temperature, pressure and sample components and state, and is released and recovered with geological winch on ship and without needing other power source. It has also pressure releasing valve and gas separator interface for separating dissolved gas in sample and post-treatment.

The present invention relates to microfluidic systems, including valves and pumps for microfluidic systems. The valves of the invention include check valves such as diaphragm valves and flap valves. Other valves of the invention include one-use valves. The pumps of the present invention include a reservoir and at least two check valves. The reservoir may be of variable volume. The present invention also relates to a flexible microfluidic system. The present invention additionally relates to a method of making microfluidic systems including those of the present invention. The method includes forming a microfluidic system on a master, connecting a support to the microfluidic system and removing the microfluidic system from the master. The support may remain connected to the microfluidic system or the microfluidic system may be transferred to another substrate. The present invention further relates to a method of manipulating a flow of a fluid in a microfluidic system. This method includes initiating fluid flow in a first direction and inhibiting fluid flow in a second direction and may be practiced with the valves of the present invention.

This invention provides a safety valve with on-line detecting function, which comprises upper valve body, lower valve body, valve seat and flap assembly, wherein the upper and lower valve body are dismountable fixed connecting structure, the valve seat and flap assembly are in the space formed by the upper and lower valve body; the flap assembly comprise sealing flap, valve rod, spring, upper clamp ring and lower clamp ring; inside the safety valve also has a sensor fitted in the flap assembly. When locating a sensing element on the internals, it will be integrated with the safety valve, or being an inner detecting element providing state variable parameter of the measured, or change the working element to monitoring element, by which can increase the safety of using kinds of pressure devices.

The invention relates to a flap valve structure of a pressure-maintaining coring device. The flap valve structure comprises a valve seat and a valve flap, one end of the valve flap is movably connected with the upper end of the valve seat, the top of the valve seat is provided with a valve port sealing surface matched with the valve flap, the valve port sealing surface is a conical surface, the valve flap is provided with a valve flap sealing surface matched with the valve port sealing surface, and the taper of the valve flap sealing surface is the same as the taper of the valve port sealing surface; the valve port sealing surface is provided with a bearing surface for supporting the valve flap; and when the valve flap is closed, the bottom of the valve flap abuts against the bearing surface of the valve seat. According to the flap valve structure of the pressure-maintaining coring device, when the valve flap is closed, displacement constraint is applied to the bottom surface and the side surface of the valve flap, the anti-deformation capability of the sealing surface can be effectively improved, the valve can bear higher pressure, and the pressure maintaining capability of the valve is improved; and the valve seat has magnetism, and the valve flap can be attracted to be closed.

The breast pump shield assembly includes a breast shield having a parabolic shape with upper and lower apertures. A conduit in fluid communication with the lower aperture receives the expressed milk and directs it to a container. A vacuum introduces through the upper aperture creates a suction within the breast shield. A center insert fits closely within the lower aperture and has a flared end with an annular surface for contacting and applying an outward force against a circular area around the nipple. A stepped-down distal section of the center insert has an outlet end with a flap valve to prevent suction from being drawn into the breast milk container while permitting expressed milk to flow into the container.

The present invention relates to an improved flap valve or other internal component for use with respiratory suction catheter and manifold assemblies. This flap valve or other internal component provides the assembly with an improved mechanism for cleaning the tip of the catheter without drawing an excessive amount of air from the respiration circuit to which the endotracheal catheter is attached. More specifically, the present invention relates principally to a closed suction endotracheal catheter system which provides improved cleaning of the catheter while minimizing air drawn from the patient's ventilation circuit by providing at least one protrusion on at least one surface of the flap valve or other internal component. By using a flap valve or other internal component with at least one protrusion, the flap valve or other internal component is strengthened and designed to prevent the flap from scraping mucus or other secretions from the catheter onto the distal surface of the flap during retraction.

An energy-saving reversed-opening type flap valve comprises an outward-flowing pipeline (1), a flap valve seat (2) and a flap valve (7), wherein a hinged shaft support (4) is arranged below the flap valve seat (2), a rotating shaft (5) is arranged in the hinged shaft support (4), the flap valve (7) is in seamless contact with an outline of the flap valve seat (2) by the rotating shaft (5), and a counter weight (6) is arranged below the flap valve (7). The energy-saving reversed-opening type flap valve has the advantages that the opening angle range of the flap valve is expanded to be 10-90 degrees, and head loss is reduced; when the flap valve is closed, the gravity center of the flap valve is close to the rotating shaft (5), the rotating inertia of the flap valve is low, and the closing dead center position of the flap valve is close to the top part when the flap valve is closed; the closing negative pressure is low, so that the closing impact force is low, the vibration times are reduced, the energy-saving reversed-opening type flap valve has the functions of achieving the silence effect, protecting a pipeline and prolonging the service life of hydraulic buildings.

The invention discloses a pressure maintaining rock core transfer device and method. The pressure maintaining rock core transfer device includes a transfer chamber, the transfer chamber is a hollow cavity with openings at both ends, the front end and the rear end of the transfer chamber are separately connected with a transfer tube through sealing washers, a rock core chamber and support frames are arranged in the transfer chamber, one ends of the support frames are fixedly connected with the outer wall of the rock core chamber, the other ends of the support frames are connected with the innerwall of the transfer chamber through pulleys, so that the rock core chamber can slide in the transfer chamber, the transfer tube is provided with a flap valve and a driving mechanism connected to theflap valve, the transfer tube at the rear end of the transfer chamber is connected with a sealing valve through a quick connector, the other end of the sealing valve is connected with an adapter, andthe sealing valve moves under the action of the driving mechanism to realize the sealing of the transfer chamber; the transfer chamber is also connected with a pressure balancing control unit, the pressure balancing control unit comprises a safety valve, a shut-off valve, an accumulator and a pressure gauge, the pressure gauge is connected with the transfer chamber, the accumulator is connected with the transfer chamber through the shut-off valve, and the other end of the shut-off valve is connected with the safety valve; and the pressure maintaining rock core transfer device is suitable forall types of pressure-maintaining core-taking operations.

The present invention provides a check valve for use in a vacuum sewage pipe. The check valve includes a body having a sewage inlet and a sewage outlet to be coupled to the vacuum sewage pipe, a flap valve element disposed in the body and rotatably supported by a shaft, and a closing mechanism. The closing mechanism can keep the flap valve element in a closed state so as to allow the flap valve element to function as a gate valve. The closing mechanism can also limit an opening degree of the flap valve element so as to allow the flap valve element to function as a check valve.

A flap valve is disclosed having a first spigot and a closure flap with an annular extension adapted to snugly fit within an outlet end of the first spigot and a flange integral with the annular extension adapted to circumscribe the outlet end. The flap valve having a second spigot of smaller diameter than the first spigot forming an extension to the first spigot.

The invention discloses a hydraulic driven mechanical hand-held seafloor sediment truth-preserving sampler and a sampling method. The sampler includes a hydraulic source, a pressure holding cylinder,a sampling tube, a flap sealing mechanism and an opening valve. The flap sealing mechanism is installed at the opening at the bottom of the pressure holding cylinder. The flap sealing mechanism comprises a flap valve base and a flap valve. The flap valve base is connected to the pressure holding cylinder in a seal connection way. The flap valve close to a valve hole is hinged to the flap valve base. A torsional spring is arranged between the flap valve and the flap valve base. A sampling tube is inserted into the pressure holding cylinder. The sampling tube is provided with a sampling tube piston fitting to the inner hole of the pressure holding cylinder. The sampling tube and the valve hole on the flap valve base are coaxial. A hydraulic source is connected to an oil inlet of an opening valve through a pipe. An oil outlet of the opening valve is connected to the through hole on the side wall of the pressure holding cylinder through a pipe. The top of the pressure holding cylinder is provided with a returning hole. The returning hole and the inner cavity at the flap valve installation position are communicated through a pipe. The hydraulic driven mechanical hand-held seafloor sediment truth-preserving sampler has a simple and compact structure and is easy to operate. Through the pressure holding cylinder, the sampling truth-preserving effects are ensured.

A combined half mask respirator and eye protector is provided, portions of the mask above the respirator being open to provide air circulation behind a lens and reduce misting of the lens. A face seal for the respirator of elastomeric material inhibits air leakage from the respirator to behind the lens, and outlet from the respirator is controlled by a flap valve which offers minimal flow resistance, also for preventing development of overpressure in the respirator and leakage of air to behind the lens.

A plastic screw cap includes two cap halves, which are produced as plastic injection-molded parts and have an internally threaded segment and an inwardly directed ring shoulder segment. The two halves of the screw cap can be pushed together, for example, on the inlet connection of the valve body of a flap valve by tongue-and-groove joints. One cap half has two hook-like ends, each of which is provided with an inwardly sloped clamping sidepiece and a groove for receiving the tongues formed on the two ends of the other half of the screw cap.

The invention discloses a garden leaf suction and compression device, which comprises a fallen leaf collection cylinder, a falling flap valve, a fallen leaf filter cylinder and a stainless steel wire mesh pressing plate. A fallen leaf filter cartridge is welded inside the fallen leaf collection cylinder; the fallen leaf filter cartridge is set as a fallen leaf collection compression chamber, and the front end of the fallen leaf collection cylinder is provided with a fallen leaf input port, and the fallen leaf input port is connected to the fallen leaf collection compression chamber; the fallen leaf filter cartridge The inner slide is equipped with a stainless steel wire mesh pressure plate; the structure is high in strength, convenient and quick to move, saving time and effort, and it is convenient to suck the fallen leaves into the leaf filter cartridge and filter out the fallen leaves, so as to realize the suction of the fallen leaves in the garden, under the compression of the stainless steel wire mesh pressure plate , The fallen leaves filtered in the fallen leaf filter cartridge are pressed into cakes and discharged from the falling flap valve to realize the compression of fallen leaves, improve the efficiency and convenience of compressed and discharged fallen leaves, and facilitate the continuous and uninterrupted absorption of fallen leaves in the garden.

The invention discloses a rope salvage type pressure maintaining coring drilling tool and belongs to the technical field of drilling equipment. The rope salvage type pressure maintaining coring drilling tool comprises an outer pipe assembly, a middle pipe assembly and an inner pipe assembly. An upper connector is arranged at the upper end of the outer pipe assembly. A drill bit is arranged at the lower end of the outer pipe assembly. The middle pipe assembly is sleeved with an inner cavity of the outer pipe assembly and achieves axial locating through a middle pipe locating elastic clamping assembly. A salvage spearhead is arranged at the upper end of the middle pipe assembly. A plate valve assembly is arranged at the lower end of the middle pipe assembly and comprises a flap valve and a flap valve seat. The flap valve is hinged to the side wall of the flap valve seat through a hinge pin and is matched with an inner cavity of the flap valve seat through a cylindrical face provided with a seal ring. The inner pipe assembly is sleeved with a cavity of the middle pipe assembly. The inner pipe assembly achieved axial locating through an inner pipe locating mechanism. A sampling pipe is arranged at the lower end of the inner pipe assembly. According to the rope salvage type pressure maintaining coring drilling tool, the pressure maintaining performance of a rock core sampling drilling tool is enhanced, and the drilling efficiency can be further improved effectively through a rope salvage sampling process.