Abstract: A method and machine for blow-moulding containers, the method involves selecting at least one characteristic point of the pressure in the container; for each selected point, defining a triggering criterion, and a pre-defined value thereof; during a production and data acquisition cycle, measuring the pressure in the container; for each selected point, defining a setpoint time for triggering, in the subsequent production cycle, the switch to the sub-phase after the characteristic point, such that: if the actual value of the criterion is ? to the pre-defined value, the setpoint time is the time at which the criterion has assumed a value equal to the predefined value, and if the actual value of the criterion is strictly higher than the pre-defined value, the setpoint time is after the actual time and is defined such that, at that time, the criterion assumes a value close to or coinciding with the pre-defined value.

Abstract: An automated irrigation gate system and method for regulating water levels in irrigation channels automates control of water through an irrigation channel based upon water levels, water flow rate, and ambient environmental conditions in the irrigation channel and an adjacent agricultural region. The system comprises at least one irrigation regulation device operationally attached to the irrigation channel. The irrigation regulation device regulates fluid flow through a channel opening in the irrigation channel through use of a gate. A fluid sensor monitors the level of fluid in the channel and an adjacent agricultural region. The fluid sensor also monitors the flow rate of the fluid flowing from the channel to the region. An environmental sensor monitors environmental conditions ambient to the region. A control portion comprises a processor that calculates the data to selectively displace the gate between an open position and a closed position relative to channel opening.

Abstract: An air venting valve for removing air from a vulcanizing mold of a vehicle tire. The air venting valve includes a valve sleeve, an air venting channel arranged inside the valve sleeve, and a movable inner part arranged in the valve sleeve, which includes a stem, the end of which is provided with a valve disc for opening and closing the air venting channel. The valve disc is against a stop surface of the valve sleeve in a closed position of the air venting valve and in an open position at a clearance from the stop surface. Furthermore, the air venting valve includes a spring member for forcing the inner part towards opening position. The front surface of the valve disc comprises a bulge.

Abstract: A hydroelectric power generating apparatus includes a check dam mounted on a hilltop portion of a hillside to accumulate water of a river reach, a power generating device mounted on a hill bottom portion of the hillside to be driven by a kinetic energy carried by the water for power generation, a diversion pipe extending from the check dam to the power generating device and having at least one diversion duct which extends along the river reach to make a pipeline that converts gravitational potential energy of the water into the kinetic energy, and a surge tank disposed to stand uprightly from the diversion duct for balancing pressure in the diversion duct.

Abstract: A foot or float valve apparatus provides a valve housing having an upper flange, a lower flange and a cylindrical section, the valve housing having an exterior and an interior with a flow bore having a central axis. The upper flange has a periphery, an upper larger diameter central opening and a plurality of circumferentially spaced smaller diameter upper openings, each smaller diameter upper opening being spaced in between the periphery and the larger diameter upper opening. The lower flange has a periphery, a lower larger diameter central opening and a plurality of circumferentially spaced smaller diameter lower openings, each smaller diameter lower opening spaced in between the periphery and the lower larger diameter opening. The cylindrical section has upper and lower end portions, wherein the upper end portion contacts the upper flange in between the upper larger diameter central opening and the plurality of circumferentially spaced smaller diameter upper openings.

Abstract: A press device for valve leakage abatement while piping system maintenance is being performed is disclosed herein. Essentially, the device comprises a frame that can clamp down and provide pressure (and therefore seal) to the valve. The design further includes a vent or a test port to assist in determining if a pipe freezing apparatus is working. Also disclosed is a system for providing pipe maintenance to a water supply line wherein one or more pipe freezing apparatuses are employed in addition to the press device.

Abstract: A fill valve assembly for a toilet tank is described. The fill valve assembly includes a two part design. The fill valve assembly includes a fill valve that connects or engages with a shank. A connection between the fill valve and the shank is located in an interior of the tank, which is easily accessed. The fill valve may be easily replaced by disconnecting the fill valve from the shank.

Abstract: A self-closing twisted slit valve which is opened by compression inside a receiving tapered female orifice. For luer fittings, internal taper of a female luer fitting provides sufficient distortion of an asymmetrical valve to distort a closed, preferably planar slit to a patent fluid pathway. The slit may be opened by valve displacement into a female connector orifice or by being pierced by a blunt cannula. The valve may be effectively used for both needleless connectors and for needleless connector adapters.

Abstract: A piston with a piston rod coupled thereto is inserted in a cylinder, which sealingly contains oil. An oil flow generated by movement of the piston is controlled by a damping force generation mechanism, thereby generating a damping force. A separator tube is disposed around the cylinder, and the oil is transmitted to the damping force generation mechanism through a branch tube integrally formed on a cylindrical sidewall of the separator tube. The branch tube is tapered at the outer circumferential portion thereof with the outer diameter thereof reducing toward the distal end of the branch tube.

Abstract: There is disclosed a control valve suitable for particulate flow and/or for a liquid stream, comprising a spherical surface with cut-off top and bottom areas, a cylindrical extension depending from the cut-off top area of said spherical surface, a collar further extending from the cylindrical extension, a common internal diameter passage through said spherical surface, cylindrical extension and collar, and said valve further comprising opposing arcuate lids, having an interior spherical concave surface, hinged to the spherical surface to provide a close tolerance relationship with the spherical surface, and an overlapping band on one of the lids to create an arcuate, spherical, concave, recessed area for reception of the leading surface of the other lid, which lids open and close at fast rates by outside means to provide an intermittent seal to the flow of the particulate or of the liquid during the operation of the control valve.

Abstract: A sprinkler head shut off device, comprising of a handle with at least one jaw, a lever, a stopper arm, and a means for reciprocating the stopper arm as the lever is rotated, in order to bring a portion of the stopper arm in contact with the orifice of the sprinkler and stop water flow. The device further comprises a locking means to lock the lever in position. The locking means comprises a member attached to the lever which locks its rotary motion in one direction at a particular position by engaging with a portion of the means for reciprocating the stopper arm.

Abstract: The tank opening-closing device is equipped with a tank opening forming member having a fuel path for leading fuel supplied from the fueling gun through the inlet to the fuel tank, a valve opening-closing mechanism having an opening-closing member and spring that closes in a state with the inlet sealed, and an opening-closing activation mechanism for opening and operating the opening-closing member. The opening-closing activation mechanism has an operating member pivoted at the tank opening forming member, and a pressing member for pressing the opening-closing member formed on the operating member, and is constituted so that by the operating member being pressed by the fueling gun and rotating, the opening-closing member is pressed by the pressing member and is rotated in the opening direction so as to open the inlet.

Abstract: An apparatus for controlling a fluid discharge through an opening in a conduit includes a conduit section, conduit inlet, conduit interior, conduit exterior, and a conduit outlet or opening having a continuously curved perimeter surface with oppositely disposed concave sections and convex sections that are continuous. Also, first and second curved gate members are rotatably mounted and are axially slidably lockably engaged to the conduit exterior including structure to move the gate members symmetrically from a closed position to an open position remaining adjacent to the outlet, the gate members in the closed position are adjacent to the outlet and are adjacent to each other. In addition, fluid sealing between the outlet and the gate members, between the gate members, and between the gate members and the outlet, when the gate members are in the closed position. The gate members are operational to control the fluid discharge through the outlet.

Abstract: A adapter provides for connection of a pressure relief mechanism to a connection fitting portion of a quick connect fitting through a mating connection fitting portion and provides for movement of the pressure relief mechanism against a check valve in a hydraulic fluid conduit through a screw thread connection to the adapter. When the check valve is thus opened fluid flow is provided substantially axially through the pressure relief mechanism, thereby reducing the likelihood of disengagement of respective portions of the quick connect fitting when hydraulic fluid is present. Collection of hydraulic fluid in a vessel connected to the pressure relief mechanism is provided to allow recycling of the fluid and to prevent release of the fluid into the environment.

Abstract: The present relates to an aquarium drainage assembly comprising a pipe member having an inner nipple adapted to be mounted within a designated opening formed in a wall of the aquarium and an outer nipple extending outside the aquarium. The inner nipple is permanently mounted within the aquarium by a locking nut mounted on the pipe member, the locking nut being adapted to tightly clamp the assembly to the wall. A sealing element is located on the pipe member and placed around the opening adjacent to an inner and an outer surface of the wall; it permits a watertight sealing of the assembly within the opening. A valve element mounted within the outer nipple allows to regulate water circulation through the assembly. The locking nut includes a thread which is tightened around the inner nipple via a corresponding thread formed around an outer surface of the inner nipple and a stopper located on the outer nipple.

Abstract: A valve for sealing a pipe opening with a seal plate movably attached to the pipe opening and a valve body fixed to the pipe opening. Moving the seal plate towards the pipe opening closes the valve, and moving the seal plate away from the pipe opening opens the valve. The valve body includes a plate stop to limit the movement of the seal plate relative to the pipe opening. For instance, the seal plate, when forced fully away from the pipe opening, is forced to define an oblique plane that is oblique to the plane of the pipe opening. A method of sealing and then unsealing a pipe opening incorporating such a seal plate is also included.

Abstract: A mixer for mixing and blending fluids within a vessel includes a passageway through which fluid is dispensed within the vessel and a flow diverter spaced from the passageway. Fluid impinges on the flow diverter and is directed toward the walls of the vessel. The diverter includes holes that produce jets of fluid generally parallel to the walls of the vessel to induce shear and turbulence within the fluid in the vessel.

Abstract: A drain valve assembly for positively sealing an aircraft waste system drain line to prevent waste fluid leakage and the formation of so-called "blue ice" due to such leakage during high altitude flight. The valve assembly has an inlet for connection to the drain line, an outlet for connection to a waste drain hose of an airport waste disposal facility, and an outer valve cover and inner ball valve between the inlet and outlet which provide truly redundant seals for the drain port in flight, can be opened with relative ease when frozen, are relatively immune to improper sealing due to obstruction by waste, enable removal of a frozen waste blockage in the waste flow path without a sudden large waste dump, and permit inspection and easy replacement, if necessary, of the valve seals.

Abstract: A valve housing using a reciprocable valve disc plate for opening and closing off the water supply in the valve housing, as well as regulating the water flow between a fully closed and a fully open position. The disc plate is provided with guide follower members that cooperate with guide channels or tracks disposed respectively on opposite side walls of the valve housing for stabilizing the movement of the disc plate and for preventing chatter and undue wear and strain of the valve stem and its bushing that would ordinarily result from water turbulence in the valve housing.

Abstract: A device for metering and entraining a measured quantity of a dry, powdered and/or granular product with a gas stream moving in a conduit system. The device includes a hollow housing having a gas inlet opening and a gas and product outlet opening to and from, respectively, the interior of the housing connected to the conduit system so that a gas stream enters and exits the housing in the conduit system. Inlet structure of an appropriate size at the gas inlet opening causes the gas stream to move between the inlet opening and the outlet opening through the interior of the housing at a sufficient velocity to pick up and entrain product in the interior of the housing in the gas stream. Product is allowed to enter the housing through a product receiving opening from a product supply container to facilitate a supply of product to the interior of the housing.

Abstract: A device is disclosed for shutting off the flow of exhaust gases from the exhaust outlet of a diesel engine having a substantially vertical exhaust stack. The device is especially useful for stopping the flow from one of twin diesel stacks when a tractor or truck having twin stacks from a single manifold is undergoing maintenance in an indoor facility. The device permits an operator standing on the floor to position a resilient pad in sealing engagement with a stack outlet twelve feet or more above floor level and lock the pad into position and to remove the device, again from ground level, when maintenance has been completed and the engine shut down.

Abstract: A drain valve assembly for positively sealing an aircraft waste system drain line to prevent waste fluid leakage and the formation of so-called "blue ice" due to such leakage during high altitude flight. The valve assembly has an inlet for connection to the drain line, an outlet for connection to a waste drain hose of an airport waste disposal facility, and an outer valve cover and inner ball valve between the inlet and outlet which provide truly redundant seals for the drain port in flight, can be opened with relative ease when frozen, are relatively immune to improper sealing due to obstruction by waste, enable removal of a frozen waste blockage in the waste flow path without a sudden large waste dump, and permit inspection and easy replacement, if necessary, of the valve seals.

Abstract: A device for metering and entraining a measured quantity of a dry, powdered and/or granular product with a gas stream moving in a conduit system. The device includes a hollow housing having a gas inlet opening and a gas and product outlet opening to and from, respectively, the interior of the housing connected to the conduit system so that a gas stream enters and exits the housing in the conduit system. Inlet structure of an appropriate size at the gas inlet opening causes the gas stream to move between the inlet opening and the outlet opening through the interior of the housing at a sufficient velocity to pick up and entrain product in the interior of the housing in the gas stream. Product is allowed to enter the housing through a product receiving opening from a product supply container to facilitate a supply of product to the interior of the housing.

Abstract: A sewage transfer system connecting the sewer outlet of a recreational vehicle to a remote sewer collection inlet that include a primary sewer line to connect the vehicle sewer outlet; an L-shape rigid pipe associated with the primary sewer line; and a hub, washer and clamping device to connect the L-shaped rigid pipe in a gas-tight and water-tight connection to the sewer inlet.

Abstract: A single-unit, remote shut-off module for use by the disabled and infirm has a single-unit module attached by clamps to external water source and outflow connector pipes and housing a shaft which itself houses a plunger with a rubber ball seal which is guided through a shaft guide by electrical current from an electrical motor unit, which is fitably attached above the external water source connector pipe to direct the plunger into the seal of the mouth of the outflow connector pipe, and thereby to interrupt the communication of water from the external water source connector pipe through the module into the outflow connector pipe during a plumbing emergency at the discretion of the user.

Abstract: The invention is a normally-closed valve apparatus for mounting within a vessel containing a product, such as a fluid, gas, or liquid. The valve apparatus comprises an actuator assembly. It also comprises a valve body assembly having a product passage with continuous walls free of openings. A valve assembly having a valve seat is also provided. The actuator assembly includes at least one draw bar straddling the valve body assembly and a sealing member. The sealing member is movable by the draw bar away from its normal engagement with the valve seat to open the valve and allow passage of the product through the valve apparatus.

Abstract: A controllable valve adapted to be fixed in the wall of a storage hopper containing particulate materials and operable to dispense an air blast into the interiors of the hopper to loosen the materials in the region of the valve.

Abstract: A valve for use with irrigation systems. The valve is fluid pressure actuated and includes a two part movable upper valve body portion which seals about the mouth of a pipe. A pedestal is threadably secured to the pipe and guides the movable valve body. The valve body is biased against the pipe by a spring connected to the pedestal.

Abstract: A device is described to retrofit an alfalfa valve, without modification of the valve, to convert it from manual to pneumatic control and provide means for closure of the valve if operating pressure to the system is interrupted. The device comprises a first vertical shaft with a short upper threaded portion to secure the shaft to the cover of the alfalfa valve and a lower unthreaded portion; a second vertical shaft above the first shaft and coupled thereto; a chamber including pneumatic means for raising and lowering the shafts, wherein the shafts are in the raised position when the chamber is under pneumatic pressure; a horizontal plate connected to the bottom of the chamber and having a central hole to permit the second shaft to pass therethrough; leg means to stand the plate on top of a flange upon which the cover of the alfalfa valve sits, and means to clamp the plate to the flange.

Abstract: An irrigation ditch gate, comprising port means for defining a passage for conduction of water, configured for mounting in a wall of an irrigation ditch and attached to a frame. A plate means comprising a generally circular plate is pivotally mounted on the port means, for being pivoted transverse to the passage, between a closed position to cover the passage and prevent the flow of water therethrough, and an open position to substantially uncover the passage to permit the flow of water therethrough. A handle lever moves the gate between the closed and open positions being pivotally attached on a first end to the plate. A moving fulcrum is provided for the handle by a second lever having one end pivotally attached to the frame and a second end pivotally attached to the handle. A retention means exerts a retaining force on the handle so that the plate is urged into close wiping engagement with the port means.

Abstract: A spray head assembly is made from a very few number of injection molded parts. Preferably a pair of elongated housing shells fit together in face-to-face confrontation, with a spring biased actuator arm or control lever pivotally mounted between them. The lever has a metal shaft extending therefrom, which passes through a flexible cone in a rubber bulkhead to maintain a waterproof seal. In front of the bulkhead is a solid plastic plate having mounted therein a reciprocally slidable member controlled by the lever. In one embodiment, the sliding member contains a generally triangular or tapered opening or openings having a sector of a circle for a base. Depending upon the position of the slide, the opening moves up or down to open or close a water passageway through the spray head. The sliding member first presents the smaller sectors of the opening or openings to an associated sealing ring to minimize the abruptness of any change in discontinuity of water flow at the edge of the opening.

Abstract: A valved fitting for a sewer or drain line access is described which permits easy sewer line entry. The fitting includes a large-straight-bore valve body and a housing which is adapted for connection to a sewer line. Embodiments include removable and permanently attached fittings. A further feature is a flexible hose which attaches to the housing and can be used to prevent leakage of sewer liquids when the sewer line is to be cleaned.

Abstract: An improved ram pump of the type having a pump housing (7) an inlet (8) for intake of fluid, a reservoir (10) for supply of a dynamic fluid head to the pump, a release valve mechanism (11) for exhaust of fluid from the pump and a lift valve mechanism (12) for output of back pressure generated by the pump. The improvements comprise a partially spirally wound lead pipe (9) connecting the reservoir to the pump inlet, an adjustable release valve mechanism (11) having a valve cup (13) and annular adjustment ring (21) which cooperate to form variable outlet ports (23) that selectively restrict exhaust of fluid to vary the height of fluid above the valve (16) and a lift valve mechanism (12) biased at a pressure greater than approximately 10 gm/cm.sup.2.

Abstract: A spray head assembly is made primarily from a very few number of injection molded parts. Preferably a pair of elongated housing shells fit together in face-to-face confrontation, with a spring biased actuator arm or control lever pivotally mounted between them. The lever has a metal shaft extending therefrom, which passes through a flexible cone in a rubber bulkhead to maintain a waterproof seal. In front of the bulkhead is a solid plastic plate having mounted therein a reciprocally slidable member controlled by the lever. The sliding member contains a generally triangular or tapered opening having a sector of a circle for a base. Depending upon the position of the slide, the opening moves up or down to open or close a water passageway through the spray head. The sliding member first presents the apex of the opening to an associated sealing ring to minimize the abruptness of any change in discontinuity of water flow at the edge of the opening.

Abstract: The valve assembly of the present invention is intended for use, within a section of pipe, to control the flow of a fluid within the pipe. The invention discloses an arrangement in which two sections of concentric pipe are slidable with respect to each other between a first position which allows fluid to flow along the pipe and a second position in which fluid flow is stopped. The outer section of pipe has a sealing plug supported in an annular position within its bore which either abuts the end of the inner section of pipe to close the valve or is separated from it to open the valve.

Abstract: A sluice gate including a closure member comprising a sheet of flexible fabric reinforced polymeric material having pairs of reinforcing members extending horizontally across the sheet with one member of each pair located on the upstream side and the other on the downstream side of the sheet in use. The pairs of members are secured together with the flexible sheet between them and at least some of the members on the upstream side extend beyond the side edges of the sluice opening to be controlled and those on the downstream side are able to pass into the sluice opening. The sluice gate includes control means for drawing the lower end of the closure member upwardly and away from the opening to progressively open it and to allow the closure member to return progressively to the closed position.

Abstract: An improved sewer relief valve which is vandal-proof and automatically opens responsive to a back flow of sewage and drain water within a plumbing system.

Abstract: A portable toilet having an improved valve arrangement for minimizing abrasion of the holding tank inlet seal. The valve arrangement includes a valve member which moves generally normal to a sealing plane defined by the seal when the valve is opened or closed. A wiper element is disposed adjacent the holding tank inlet and is positioned to exert a wiping action on the sealing surface of the valve member when the valve is operated.

Abstract: A furnace valve suitable for use in an electric furnace in the manufacture of mineral fibre comprising a water cooled sleeve provided with a carbonaceous member which is formed with a flow passage extending therethrough and a shutter plate movable across the face of the carbonaceous member to control the effective discharge area of the flow passage.

Abstract: Valve apparatus for controlling the flow of irrigation water includes a valve plate in the irrigation water line, and a piston connected to the valve plate and movable in a cylinder, with fluid pressure in the cylinder opposing the movement of the valve plate to control the flow of irrigation water from the irrigation line.

Abstract: A venting valve for a cargo hose includes a cover plate attachable to the hose, the plate having an opening which receives a coupling to a check valve. The check valve prevents escape of fuel but admits air to permit fuel to drain from the hose into an attached storage tank, preventing spillage when the hose is subsequently detached therefrom and handled.

Abstract: A sealing arrangement primarily for a sluice gate which comprises a frame and a door movable between an open position and a closed position in which it closes an opening in the frame and sealing faces of the door and the frame are in sealing engagement to prevent the flow of liquid through the opening. The sealing arrangement comprises an intermediate wedge section strip interposed between two side strips having inclined planar faces in contact with the inclined planar side faces of the intermediate strip. The intermediate strip is either arranged to bear against the door or secured to the frame, and either one of the side strips is secured to the frame or both side strips are arranged to bear against the door respectively.

Abstract: An improved device for easy attachment to an external water spigot, which is designed to allow a slight dripping of water when ambient temperatures drop below a point at which there is a danger of water freeze, within house pipes or spigot. The present device has a simple moving valve, or water release shaft, which extends axially between a closed volume of a particular fluid, and a valve seat proximate the connection of the device to the spigot outlet. The improved temperature responsive valve taught herein ensures a most efficient opening function, during temperature drops below approximately 32.degree. F. by employing a closed fluid volume that is unaffected by the temperature of any released water. Further, the particular improvements involve a specially configured liquid chamber piston which ensures a large opening excursion, at desired temperature range.

Abstract: A sprinkler-sealing device has a control member which can be coupled to a manually used operating rod system to activate a sealing element intended to seal the nozzle opening of a sprinkler against water. A housing is provided comprising recesses and guides to take up and position the control member and the sealing element. A pair of stops is located at the front side of said housing for approximative alignment of the housing with the sprinkler to be sealed. Spring-loaded gripping members are connected moveably with the housing for releasable connection of the housing to said sprinkler.

Abstract: A fluidized solids control valve is disclosed that is particularly well adapted for use with a flow of coal or char that includes both large particles and fines. The particles may or may not be fluidized at various times during the operation. The valve includes a tubular body that terminates in a valve seat covered by a normally closed closure plate. The valve body at the seat and the closure plate is provided with aligned longitudinal slots that receive a pivotally supported key plate. The key plate is positionable by an operator in inserted, intermediate and retracted positions respecting the longitudinal slot in the valve body. The key plate normally closes the slot within the closure plate but is shaped and aligned obliquely to the longitudinal slot within the valve body to provide progressively increasing slot openings between the inserted and retracted positions.

Abstract: A cam-lock water gate designed to control water flow from a pond, lake, field, canal or the like. A primary body member is provided with an aperture therethrough and a short section of pipe stub integral with the main body member and opening into said aperture. An adjustable gate plate is mounted on said main body member and constrained between parallel guide channels to permit the gate to be adjusted for completely opening the aperture, partially opening the aperture, or completely closing the aperture. A regular duty embodiment employs a simple handle and rod control for both adjusting the gate plate as well as locking the cam-lock mechanism to positively retain the gate plate in the set position once adjusted. Another heavy duty embodiment employs heavier materials and heavier construction of the device and also incorporates a security lock bar that enables the gate plate to be locked to prevent unauthorized adjustment thereof.

Abstract: A canister type vacuum cleaner having cylindrical walls and a bottom therein supporting at the upper open end thereof a suction type blower and filter is provided with discharge means attachable to the bottom of the canister and including a transverse slide adapted to close an opening formed in a supporting plate for the slide and an additional coaxial opening which is to be formed in the bottom of the canister, the canister also including a conical, funnel-like deflector having a central opening coaxial with the opening in the bottom of the canister, the slide forming a closure which is spring-pressed in closing direction and including a manipulating handle and an end which may be operated when the slide is in open position to maintain the same in said position to facilitate emptying the canister from the bottom thereof without requiring removal of the suction head and dumping of the canister.

Abstract: A device for controlling the flow of water between an irrigation ditch and an adjacent field. A conduit having a first end opening into the irrigation ditch and a second end opening into the field to be irrigated. The cover is pivotally attached to the first end of the conduit by means of a "J"-shaped hinge. A handle is provided on the exterior of the cover and can be engaged by a manually-held instrument to pivot the cover to a position above the conduit where it will rest due to the configuration of the hinge part. The conduit is positioned relative to the irrigation ditch such that the first end is recessed inwardly of one side wall of the ditch and extends below the bottom wall of the ditch.

Abstract: A gate assembly has a frame with a sill and an opening for the passage of a fluid, and a gate slide mounted on said frame for movement toward and away from said sill, between open and closed positions. The improvement, in combination therewith, comprises a first flange projecting from the frame on both sides of the opening, a resilient sealing member fixed to the first flange, and a second flange substantially identical to the first flange projecting from the back side of the gate slide. The first and second flanges are so positioned that, when the gate slide is in the closed position against the sill, the first and second flanges overlap and the resilient sealing member is compressed so as to produce a water tight seal.

Abstract: An improved sewer relief valve which is vandal-proof and automatically opens responsive to a back flow of sewage and drain water within a plumbing system.