Abstract: A thief hatch for a pressure vessel system including an annular seal flange attachable to an opening of a pressure vessel of the pressure vessel system, a piston coupled to the seal flange, an annular seal assembly located between an outer surface of the piston and an inner surface of the seal flange, and a biasing element coupled to the piston and configured to apply a biasing force against the piston to bias the piston towards a first position corresponding to a closed configuration of the thief hatch.

Abstract: The present invention aims to provide a fluid handling device which can be manufactured more conveniently, can easily open and close a channel, and can be miniaturized. The fluid handling device of the present invention includes: a first channel; a second channel; and a valve disposed between the first channel and the second channel, in which the valve includes: a groove-shaped valve seat disposed in a board, and a flat plate-shaped flexible layer covering the groove-shaped valve seat, and the valve communicates between the first channel and the second channel when the flat plate-shaped flexible layer and a bottom of the groove-shaped valve seat are spaced apart from each other, and blocks communication between the first channel and the second channel when the flat plate-shaped flexible layer and an inner wall of the groove-shaped valve seat are in contact with each other.

Abstract: A hand vacuum cleaner has a main body housing a suction motor, an air treatment member having a front end and a rear end with a central longitudinal axis extending between the front and rear ends and a bleed valve having a bleed air flow path that extends from a bleed air inlet to a bleed air outlet. The hand vacuum cleaner has right and left laterally opposed sides that are spaced apart in a direction transverse to the central longitudinal axis, and the bleed air inlet and the bleed air outlet are transversely spaced apart.

Abstract: Aspects of the subject technology relate to inductive acoustic filters for acoustic devices. An inductive filter may include a substrate, an etched serpentine channel in a surface of the substrate and extending within the substrate from a first port in the substrate to a second port in the substrate. The inductive filter may also include a polymer cover layer adhesively attached to the surface of the substrate over the etched serpentine channel. The inductive filter may be positioned over an opening in a substrate of an acoustic module, such as a microphone module or a speaker module.

Abstract: A vent limiting device adapted to be operably coupled to an exhaust vent of a fluid regulator. The vent limiting device includes a housing, a poppet disposed in the housing, and a retaining element arranged to retain the poppet in the housing. The housing has a fluid passageway extending between a fluid inlet and a fluid outlet. The poppet is movably disposed in the housing, responsive to pressure at the fluid outlet, to control fluid flow through the fluid passageway. The housing includes one or more retaining features that engage the retaining element to retain the retaining element in the housing.

Abstract: Method for introducing and maintaining a level of negative pressure in a body cavity of at least 80 mmHg using a tube having an elongate distal portion and a proximal portion having first and second arms, each arm having a lumen in flow communication with one another and with the body cavity via apertures at or near the distal end of the tube, wherein the first arm or tubular extension therefrom is adaptable to receive suction from a suction source. An indicator, arranged in relation to the second arm, signals when a specific negative pressure has been exceeded in the tube, or a valve, arranged in relation to the second arm, admits ambient air into the lumen of the second arm when suction is applied to the tube and differential air pressure between the air in the lumens of the tube and ambient air exceeds a specified amount.

Abstract: A vent limiting device adapted to be operably coupled to an exhaust vent of a fluid regulator. The vent limiting device includes a housing, a poppet disposed in the housing, and a retaining element arranged to retain the poppet in the housing. The housing has a fluid passageway extending between a fluid inlet and a fluid outlet. The poppet is movably disposed in the housing, responsive to pressure at the fluid outlet, to control fluid flow through the fluid passageway. The housing includes one or more retaining features that engage the retaining element to retain the retaining element in the housing.

Abstract: A connector system is configured to fluidly connect a nasogastric tube assembly including a lumen and a tube to a medical device. The system includes a connector including: a fitting configured to provide a fluid-tight connection with the medical device; a neck coupled to the fitting, the neck configured to attach to the nasogastric tube assembly; and a body coupled to the neck, the body configured to provide a fluid-tight connection with the nasogastric tube assembly when at least partially inserted within the lumen; and a first tether including a first fastening region defining a first opening configured to receive the neck, a second fastening region defining a second opening configured to couple to the nasogastric tube assembly, and a link coupling the first fastening region to the second fastening region, the link configured to maintain a fixed distance separating the first fastening region from the second fastening region.

Abstract: A cleaning robot that includes a housing having a front portion, a rear portion, a door and a hinge; wherein the door is pivotally connected to the rear portion of the housing via the hinge; wherein the rear portion comprises a rear opening; wherein the door is arranged to move between a closed position in which the door substantially closes the rear opening and an open position in which the door does not close the rear opening; wherein the door comprises a floating element or is coupled to a floating element, wherein the floating element is positioned and shaped to induce the door to move to the closed position when the cleaning robot is submerged in fluid and to remain in an open position when out of a pool and positioned in a horizontal position.

Abstract: A male external incontinence device comprising a drainage tube assembly having a proximal chamber in fluid communication with a drainage tube, the proximal chamber comprising an atmospheric equilibrium valve assembly. The atmospheric equilibrium valve assembly has an airway conduit with a upper portion in fluid communication with the proximal chamber, and a lower portion having an air inlet chamber. A one-way air valve disposed in the airway conduit above the air inlet chamber, the one-way air valve comprising a first pair of opposing walls disposed at a first set of opposing angles such that the first pair of opposing walls abut each other at an apex, the apex having a self-sealing slit.

Abstract: A vacuum valve includes a valve housing (1) having a first housing part (1a) and a second housing part (1b), between which a ring-shaped housing seal (3b) is arranged, and a closure member (9) which is adjustable between an open position in which the vacuum valve is open and a closed position in which the vacuum valve is closed. The housing seal (3b) is mounted on a ring-shaped carrier (3a). Additionally on the carrier (3a) radially inside the housing seal (3b) is mounted a ring-shaped seat seal (3c) against which the closure member (9) is pressed with the closure member (9) in the closed position, wherein the seat seal (3c) abuts against a sealing face of the valve housing (1).

Abstract: A high-sensitivity terahertz micro-fluidic channel sensor and a preparation method thereof. The sensor includes a substrate and a cover layer, respectively provided with a metal plane reflector and a metal microstructure layer; a micro-fluidic channel is formed between the metal plane reflector and the metal microstructure layer; and when the micro-fluidic channel tests liquid, a composite structure formed of the metal microstructure layer, the test liquid and the metal plane reflector shows good absorption properties. The method includes forming a metal plane reflector and a metal microstructure layer on a substrate and a cover layer, respectively; fixedly connecting the substrate to the cover layer, and forming a closed micro-fluidic channel between the substrate and the cover layer; and forming a through via, communicated to the micro-fluidic channel, on the substrate and/or the cover layer, to form a flow channel for transferring liquid to be tested to or from the sensor.

Abstract: A surface mounted heater includes a universal seal fitting. A first aperture in the substrate secures the substrate to an inlet gas valve of the component. The first aperture has a scalloped radii with a first radii and a second radii. The first radii corresponds to a first type of component seal and the second radii corresponding to a second type of component seal.

Abstract: Apparatus and method for providing the apparatus, the apparatus including: a duct; and a non-return valve; wherein the duct has a first portion and a second portion; the first portion has a first end and a second end; the first end is open to a fluid (e.g. air); the second end is connected to the second portion such that fluid is permitted to flow between the first portion and the second portion; the non-return valve is positioned at or proximate to the second end; and the non-return valve is arranged such that, upon application of a suction force to the first portion at the first end, fluid flows into the first portion via the non-return valve from outside the duct, and through the first portion from the second end to the first end.

Abstract: A relief valve (60) for a liquid container, the valve comprising a substantially conical body (50) extending into the container, and tapering inwardly away from an external wall of the container, at least one air inlet passage (62) through the substantially conical body; and a flexible diaphragm (53) extending over the conical body, being attached at its outer periphery around the substantially conical body and having a central opening surrounding the substantially conical body above the air inlet passage so as to seal the air inlet passage until the pressure within the container falls below a predetermined level.

Abstract: A gas purging valve is operative to be connected to piping in a Fire Protection System (FPS) and to bleed gas at a predetermined rate. The valve includes an inlet in gas flow relationship with the FPS piping and a central passage in gas flow relationship with the inlet. The valve also includes a calibrated orifice removeably disposed in the central passage, in gas flow relationship with the passage and operative to allow a maximum predetermined gas flow rate therethrough. The valve further includes an outlet in gas flow relationship with the calibrated orifice. A ball is disposed upstream of the central passage. The ball is operative to allow gas flow through the gas purging valve but operative to impede the flow of water through the gas purging valve.

Abstract: A relief valve for an oil pump can prevent a main gallery from being damaged by largely decreasing peak pressure of an oil pump by using bypass flow according to oil pressure of the main gallery in cold start of an engine, and can control the discharging pressure of the oil pump at the optimum level when the engine is warmed up, by defining a housing chamber communicating with the main gallery of the engine and a plunger chamber bypassing some of oil flowing to the main gallery to the oil pump or an oil pan in accordance with oil pressure in the housing chamber using a plunger chamber, and by changing a modulus of elasticity of a coil spring elastically supporting the plunger in accordance with the oil pressure produced in the main gallery, by using a substance that is expanded by temperature.

Abstract: A magnetic safety valve for installation through a tank wall incorporates a piston movable within a valve body. The valve is held normally-closed by two opposite-pole magnets, one in the inner end of the piston, and one in the valve body. A vacuum produced by a pump connected to the valve will act upon the outer end of the piston, producing a force tending to move the piston outward. When the vacuum-induced outward force on the piston exceeds the attractive force between the two magnets, it pulls the piston outward and away from the valve body magnet, unseating the inner end of the piston from the valve body, and allowing outward fluid flow through the valve. A second valve seat may be provided for engagement with an outer portion of the piston to prevent uncontrolled fluid flow out of the tank in the event of valve damage.

Abstract: A relief valve for an oil pump, may include a housing defining a relief space, a plunger slidably disposed in the relief space and dividing the relief space into a housing chamber and a plunger chamber, an elastic member elastically supporting the plunger and being compressed by oil pressure of the main gallery, wherein the oil pressure of the main gallery may be relatively lower than an oil pressure under a warm-up state of the engine, a locator disposed under the plunger and supporting the elastic member, a plug coupled to a lower portion of the housing under the relief space and supporting the locator such that a modulus of elasticity in the elastic member may be changed by a change in seat position of the elastic member, and a negative pressure supplier selectively generating negative vacuum pressure in the locator such that a height of the locator changes.

Abstract: Provided is a substrate treating apparatus using a process gas and an adjustment plate used thereof. A substrate treating apparatus including a chamber providing a space in which a process is performed, a support member supporting a substrate in the chamber, a gas supply member supplying a process gas onto the substrate disposed on the support member, and an exhaust assembly coupled to the chamber to exhaust a gas in the chamber, wherein the exhaust assembly includes an exhaust pipe connected to the chamber, an exhaust member connected to the exhaust pipe to provide a vacuum pressure in the exhaust pipe, a valve adjusting an opening rate of the exhaust pipe, and an adjustment plate having a cover plate which is provided in the chamber to interfere with a flow of the process gas in an internal region of the chamber in a direction corresponding to, when the exhaust pipe is partially opened, an opened region of the exhaust pipe. Consequently, the process gas may be uniformly supplied onto the substrate.

Abstract: The closing and sealing device for use in air admittance valves includes a valve housing (10) designed to be connected to the waste water pipe system, an upper cap (14) and a valve closing and sealing device which includes a fixed valve seat (22) and a movable closing member (24). The housing (10) includes at least one passageway (16) in communication with the surrounding atmospheric air, and at least one passageway (18) in connection with the inner space (19) of the sewage system, each of the passageways being in contact with the movable closing member (24).

Abstract: A Dual Action, Low Head Isolation Valve is a plumbing fitting that will isolate the interior pipes of a house from the exterior temperatures of summer and winter while allowing the passage of gasses through the system for venting. This valve would be installed at the top of the household plumbing drainage system, or the top vent, in the attic or above the roof. This valve will allow for the system to draw in air and exhaust the septic gasses, or respirate in both directions with very low head or resistance.

Abstract: A vacuum relief valve is provided. The vacuum relief valve includes a valve body, a filter, a valve stem, a valve seal, a valve seat and valve biasing structure. The valve body includes an interior, an inlet side and a tank side. The inlet side is located substantially opposite the tank side. The filter is located at the inlet side. The valve stem is positioned on the interior the valve body. The valve seal is positioned about the valve stem. The valve seat cooperates with the valve seal to seal the vacuum relief valve. The valve biasing structure is located between the valve seal and the tank side. The valve biasing structure is configured to bias the valve seal towards the valve seat.

Abstract: The air admittance vent (“AAV”) includes a cup shaped vent body and a vertically reciprocating valve element that seats against a valve seat that has two separate contact areas defined by an annular ridge and a conical face formed in the bottom of the vent body. When the valve element moves into its closed position, the pliable diaphragm of the valve element initially contacts the annular ridge, which forms a first part of the valve seat before moving fully into sealing contact with the conical face, which forms the second part of the valve seat. The contact with the annular ridge provides a first initial seal before the diaphragm nests into contact with the conical face to form a second seal with the valve seat.

Abstract: A vacuum relief valve is provided. The vacuum relief valve includes a body having a side wall, and a stem that is movable with respect to the body between an open position and a closed position. The stem is biased in the closed position. The vacuum relief valve further includes a first sight glass coupled to the body and configured to enable visual inspection of a sealing area of the vacuum relief valve. The sealing area includes at least a portion of said stem.

Abstract: A check valve made up of a substantially rigid portion and a substantially flexible membrane that is generally dome shaped. The substantially rigid portion includes one or more spokes that meet in the center of the rigid portion and one or more partial spokes extending part way to the center of the rigid portion. The dome shaped, substantially flexible membrane also includes one or more flexible spokes and one or more collapse zones. The completed check valve is made by connecting a center portion of the substantially rigid portion to a center portion of the dome shaped, substantially flexible membrane.

Abstract: A vacuum regulator has a vacuum range controller and a manifold including an inlet opening, a vacuum source connection, and a bleed orifice. The vacuum range controller includes a regulator stem having a metering tip, a stem body, and an adjustment rod. The metering tip is selectively positioned against the bleed orifice. The vacuum range controller further includes a vacuum adjuster having an adjustment collar and a resilient member which are coaxially disposed on a portion of the regulator stem. An adjustment knob engages the adjustment rod for concurrent rotational movement therewith.

Abstract: A negative pressure valve assembly is provided. The valve assembly comprises a valve port assembly comprising a port and a flange substantially surrounding the port, a valve comprising a plate adapted to substantially cover the port, the plate comprising a minor edge, a major edge having a major edge length, and a plate biasing assembly stop located at a first position along the major edge, the first position more than 50% of the major edge length as measured from the minor edge. The valve assembly further comprises a hinge coupled to the plate, the hinge adapted to couple the plate to the flange, and first plate biasing assembly adapted to couple to the valve port assembly and to bias the plate towards the valve port assembly, the first plate biasing assembly comprising a resilient member adapted to contact the stop plate.

Abstract: A cryopump includes: a vent valve provided with a cryopump housing to discharge a gas pumped on a cryopanel to the outside of the cryopump housing; and a control unit configured to determine, based on the pressure measured by a pressure sensor, whether a positive pressure is generated in the cryopump housing relative to the external pressure of the cryopump housing, and configured to open the vent valve when it is determined that the positive pressure is generated, and configured to close the vent valve when it is determined that the positive pressure is not been generated. The valve-closing force of the vent valve is arranged such that, when the vent valve is closed by the control unit, the vent valve can be mechanically opened by being subjected to the differential pressure between the internal pressure and the external pressure of the cryopump housing.

Abstract: Embodiments of the invention provide a pumping system and a discharge vacuum relief valve for use in a hydraulic system including a safety vacuum release system pump to circulate water in a swimming pool and/or a spa. The hydraulic system includes one or more check valves located on a discharge side of the safety vacuum release system pump. The discharge vacuum relief valve is capable of venting a vacuum at the discharge side of the safety vacuum release system pump during a vacuum event at a suction side of the safety vacuum release system pump.

Abstract: An air admittance valve configured when subjected to a negative pressure condition to vent a pipe system to an ambient environment. In general, the air admittance valve includes a main body, inner and outer valve seats, a flexible sealing element, and a lid. The inner and outer valve seats define at least one vent opening between valve seats that is configured, when open, to communicate with the ambient environment. The flexible sealing element is devoid of a rigidifying structure, is configured to move to and from a closed position and an open position, and defines an outer perimeter surface, an inner perimeter surface, and opposite top and bottom surfaces extending between the outer and inner perimeter surfaces. At least one of the lid or the main body further comprises one or more guiding elements that define one or more guiding surfaces configured to guide the sealing element to and from the closed position and the open position.

Abstract: A vacuum-actuated shear valve coupled between piping from a storage tank and piping internal to a fuel dispenser that automatically opens and closes in response to a vacuum level. A vacuum actuator is provided to control a fuel flow valve inside the shear valve. When a sufficient vacuum level is generated to the vacuum actuator, the actuator keeps the flow path valve inside the shear valve open. When the vacuum is lost, the vacuum actuator releases the flow path valve inside the shear valve, which closes it. The vacuum actuator is coupled to a secondary containment space of a fuel-handling component that is drawn under a vacuum level by a vacuum-generating source to monitor for leaks. Thus, if a leak occurs in the monitored secondarily contained space, the shear valve is automatically closed to prevent the flow of fuel from continuing to be supplied to the source of the leak.

Abstract: A vacuum brake booster includes a housing and a bent connecting element for connecting the vacuum brake booster to a vacuum source, wherein the connecting element includes a first connecting piece which extends through an opening in the brake booster housing into a vacuum chamber of the vacuum brake booster, a second connecting piece for connecting the connecting element to the vacuum source, and a multi-part housing with a first housing part which carries the first connecting piece and a second housing part which carries the second connecting piece arranged at a first angle to the first connecting piece.

Abstract: A method of installing an axially adjustable driveshaft assembly in a drive train system is described. Two hollow driveshaft sections, where one has a valve through an aperture in it and each has an end fitting, engage each other to form an axially adjustable driveshaft assembly that has a sealed internal chamber within. When a pressurized air or vacuum source is connected to the valve, air fills the chamber or air is removed from the chamber, which correspondingly increases or decreases a drive train system length. This results in facilitating the installation of the driveshaft assembly between a transmission and an axle assembly in a drive train system.

Abstract: 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.

Abstract: A vacuum relief valve is provided. The vacuum relief valve includes a valve body, a filter, a valve stem, a valve seal, a valve seat and valve biasing structure. The valve body includes an interior, an inlet side and a tank side. The inlet side is located substantially opposite the tank side. The filter is located at the inlet side. The valve stem is positioned on the interior the valve body. The valve seal is positioned about the valve stem. The valve seat cooperates with the valve seal to seal the vacuum relief valve. The valve biasing structure is located between the valve seal and the tank side. The valve biasing structure is configured to bias the valve seal towards the valve seat.

Abstract: An air admittance vent diaphragm assembly is disclosed. The assembly comprises a base, an annular retainer ring, and an annular malleable washer. The base has an annular portion and a stem extending orthogonally from the center of the annular portion. The annular retainer ring includes a circumferential skirt engaged with an outer perimeter of the annular portion of the base, with the stem extending beyond the annular retainer ring. The annular malleable washer is disposed between the annular retainer ring and the annular portion of the base.

Abstract: A vacuum relief valve is provided. The vacuum relief valve includes a body having a side wall, and a stem that is movable with respect to the body between an open position and a closed position. The stem is biased in the closed position. The vacuum relief valve further includes a first sight glass coupled to the body and configured to enable visual inspection of a sealing area of the vacuum relief valve. The sealing area includes at least a portion of said stem.

Abstract: An application for a living-hinge air vent valve connectable to a sewer conduit includes a base and a cover sealed to the base forming a cavity between the cover and the base. A fluid inlet shaft depends from a roof of the base and is connected to external air passages passing through a side of the base and through vents in a side of the cover. A living-hinge flapper is situated above the fluid inlet shaft and within the cavity. The living-hinge flapper allows air to flow from the fluid inlet shaft into the cavity and prevents sewerage gasses from flowing from the cavity out through the fluid inlet shaft. One or more connecting shafts in the base fluidly connect the cavity with a sewer system.

Abstract: A check vacuum breaking device for a tap comprises a locking member screwed into a chamber of a tap, the chamber including an inlet and an outlet, the locking member including a cover member secured on a top end thereof and having plural air bores disposed around a rim of the cover member and a shaft extending downward from a center of a bottom surface of the cover member; a fitting member assembled to the chamber of the tap and including a hollow peg extending upward from a central portion thereof and having a closed bottom to be fitted to the shaft of the locking member, and including a stepped recess formed on an upper end thereof, a stopping pad fitted to the stepped recess, wherein the fitting member includes an annular loading member fitted to a lower end thereof and an anti-leak loop to cover the loading member.

Abstract: A vacuum relief assembly for a containment vessel. The vacuum relief assembly includes a normally closed vacuum activated valve that selectively permits flow into the containment vessel from the atmosphere through an interior passage. The valve body includes an inlet opening into the interior passage and an outlet opening normally closed by the valve. A screen member is disposed upstream of the inlet opening. The screen is cylindrical and is supported between a shoulder on the valve body and a cap secured to the valve body.

Abstract: A metallic air admittance valve has a tubular body with a valve chamber integral to one end of the tubular body. The valve chamber has a valve and an air inlet configured to permit the flow of air when the pressure within the valve is less than the pressure outside of the valve, but to prevent the flow of air when the pressure within the valve equals or exceeds the pressure outside of the valve. The tubular body and valve chamber are fabricated from metal and, therefore, do not emit noxious or toxic fumes when subjected to fire. Plumbing systems in commercial buildings may have metallic air admittance valves located within the plenum area of the building without presenting the risk of the distribution of toxic fumes throughout the building when the air admittance valve is subjected to fire.

Abstract: An air admittance valve configured when subjected to a negative pressure condition to vent a pipe system to an ambient environment. In general, the air admittance valve includes a main body, inner and outer valve seats, a flexible sealing element, and a lid. The inner and outer valve seats define at least one vent opening between valve seats that is configured, when open, to communicate with the ambient environment. The flexible sealing element is devoid of a rigidifying structure, is configured to move to and from a closed position and an open position, and defines an outer perimeter surface, an inner perimeter surface, and opposite top and bottom surfaces extending between the outer and inner perimeter surfaces. At least one of the lid or the main body further comprises one or more guiding elements that define one or more guiding surfaces configured to guide the sealing element to and from the closed position and the open position.

Abstract: The invention relates to a re-configured valve design to accommodate a high volume of product in the delivery system and the dispensation of product upon the application of a predetermined vacuum condition on the downstream side of the valve.

Abstract: The present invention teaches a pressure release protection device for automatic ground cleaning vehicles, comprising an air suction pipe, an airtight cover, an air relief valve, a spring, a filter screen, a filter screen holder, a crown bar, a floating ball, and a foam isolating bucket, wherein the filter screen holder is fixed connected to the upper wall of the waste water tank, and the filter screen is fixed connected to the filter screen holder; the foam isolating bucket is connected to the filter screen holder; the floating ball is disposed inside of the foam isolating bucket and is connected to the crown bar; the crown bar is installed into the central hole of the filter screen holder, and can slide up and down with the floating of the floating ball; said airtight cover serves to cover the top of the waste water tank; the air relief valve comprises a handle part and a tubular shank part, wherein the shank part is installed into the central hole of the airtight cover.

Abstract: A check valve in which a valve opens to allow a fluid to flow out when a differential pressure of a pressure in one area with respect to that in the other area becomes large and remains closed even when the pressure in the other area becomes higher than that in the one area includes a lip in contact with an opposed face provided at a position opposite to the check valve, wherein the lip is constructed so as to be in contact with the opposed face in such a way that the tip of the lip is bent to a side of the other area and a satin finish is given to the whole area of a surface of the lip that could be brought into contact with the opposed face.

Abstract: An application for a living-hinge air vent valve connectable to a sewer conduit includes a base and a cover sealed to the base forming a cavity between the cover and the base. A fluid inlet shaft depends from a roof of the base and is connected to external air passages passing through a side of the base and through vents in a side of the cover. A living-hinge flapper is situated above the fluid inlet shaft and within the cavity. The living-hinge flapper allows air to flow from the fluid inlet shaft into the cavity and prevents sewerage gasses from flowing from the cavity out through the fluid inlet shaft. One or more connecting shafts in the base fluidly connect the cavity with a sewer system.

Abstract: A vacuum relief safety valve includes a housing defining an inner chamber and attached to the suction-side of the swimming pool or spa pump. An air inlet aperture is formed in the housing so as to be open to ambient air. A sealing element is disposed within the housing and biased against the air inlet aperture by a spring so as to effectively seal the inner chamber of the housing from ambient air. When a maximum allowed vacuum level within the pump is exceeded, such as when a swimming pool drain is obstructed, the sealing element moves into the inner chamber and opens the air inlet aperture causing the pump to rapidly lose its prime and enabling removal of the entrapment.

Abstract: A vacuum relief safety valve includes a housing defining an inner chamber and attached to the suction-side of the swimming pool or spa pump. An air inlet aperture is formed in the housing so as to be open to ambient air. A sealing element is disposed within the housing and biased against the air inlet aperture by a spring so as to effectively seal the inner chamber of the housing from ambient air. When a maximum allowed vacuum level within the pump is exceeded, such as when a swimming pool drain is obstructed, the sealing element moves into the inner chamber and opens the air inlet aperture causing the pump to rapidly lose its prime and enabling removal of the entrapment.

Abstract: An air admittance vent diaphragm assembly is disclosed. The assembly comprises a base, an annular retainer ring, and an annular malleable washer. The base has an annular portion and a stem extending orthogonally from the center of the annular portion. The annular retainer ring includes a circumferential skirt engaged with an outer perimeter of the annular portion of the base, with the stem extending beyond the annular retainer ring. The annular malleable washer is disposed between the annular retainer ring and the annular portion of the base.