Abstract: A refrigerant metering device for a vapor compression refrigeration system. The metering device employs a restrictor fabricated of a porous material to achieve the desired pressure reduction across the device. The porous material is housed in a casing that provides support for the restrictor and enables installation of the device into the system. Any suitable porous material may be used to make the restrictor, but in the preferred embodiments, a porous polyethylene material is used. In the preferred embodiments, a filter is provided upstream in the refrigerant flow path to reduce the possibility of restrictor fouling and resultant system performance degradation. In one embodiment, the filter and restrictor are combined as two sections of an integral filter and restrictor. The device is effective in reducing refrigerant flow noise during both steady state operation and post shutdown transients.

Abstract: The invention relates to an antinoise baffle especially for screw type valves having a first ceramic disk (13) fixed in the body with at least one hole (13a) for the flow of water, a second ceramic disk (14) resting against and rotating on the first with at least one lateral slot (14a) positionable in correspondence to and away from the one of the first disk following a quarter or half rotation of the second disk. At least one net (21) is placed and blocked of the second disk (14) and has at least one wing which extends towards the first disk near to one or each lateral slot (14a) or said second disk, the wings extending between said slot and the opening (20) for the outlet of water.

Abstract: A spool control valve in which communicating passages are provided in the spool to communicate between a pair of locations in the spool passage and filter means are provided in a communicating passage to prevent valve orifices being blocked by particles of foreign matter in the fluid.

Abstract: A method and apparatus for pumping a liquid-fiber suspension, and specifically for pumping high consistency fiber suspensions in the pump and paper industry. The method of pumping a liquid-fiber suspension includes the moving of the suspension into a pump, separating a portion of the liquid part of the suspension from the liquid-fiber suspension during the pumping operation and directing the separated liquid to the suspension at a point somewhere between a situs in advance of the pump inlet and the pump outlet. This method is enabled by an apparatus, in which at least part of the surfaces of the pump (1) is provided with filter surfaces (6, 7, 8, 9, 10), through which the liquid separated from the suspension is returned either into the pump, directly in front of the suction opening (11) of the pump (1) or to some other suitable place in the vessel containing the suspension.

Abstract: A backflushing system for an inlet filter in an airway adapter in a gas flow sampling and analyzing system includes a back flush fluid supply conduit and sampling conduit connected to the airway adapter by a single coupling element. Flow of back flush fluid causes material blocking the filter to be washed away into the respiratory conduit for disposal. Flow of backflush fluid is restricted to one way flow through the backflush conduit by a disk shaped valve member mounted in the air way adapter.

Abstract: A toilet tank valve having a vertical riser with a collet thread and a plurality of flexible collet fingers. A slider tube is fitted into the riser. It has a plurality of peripheral grooves that can be engaged by the fingers to adjust the elevation of the slider tube. A collet nut threaded to the riser compresses the finger for this purpose. Valve workings are mounted to the slider tube. They include an inverted cup float slidingly fitted around the riser which can engage splines on the collet nut so that rotating the float can turn the collet nut, enabling the slider tube's elevation to be adjusted and its adjustment retained.

Abstract: The present invention provides a filter cover assembly for use with the filter of a respirator. The semi-rigid filter cover assembly fits snugly over the face of the filter and, with the use of a one-way valve assembly mounted therein, allows the user to continue using the respirator while at the same time containing any contaminated particulate matter that may fall out of the filter. This permits the user to continue using the respirator while in a decontamination zone without danger of dispersing contaminated matter. It also permits easy handling and storage of the filter between uses without necessitating the cleaning of the filter.

Abstract: A liquid shut-off valve has a hollow cylindrical casing connected in a liquid pipe such as a water supply pipe, a hollow cylindrical valve seat member disposed in a downstream portion of the casing and having a valve seat opening, a guide member disposed in an upstream portion of the casing and having large openings for allowing main flow of the liquid to pass therethrough and a small opening for shunting a small-rate flow of the liquid serving as a signal liquid, and a hollow valve seat member slidable in the casing between an open position where it opens the valve seat opening and a close position where it closes the valve seat opening. The hollow valve member having pressure-receiving ends of different pressure receiving areas so that it is moved to the close position when a liquid pressure is established in a pressure chamber defined by the hollow valve member and the guide member.

Abstract: A flow detector according to the present invention is arranged in a fluid piping circuit, or at an inlet or an outlet of the fluid piping circuit and has a fluid inlet and a fluid outlet, and further comprises a piston having a magnetic member as a part thereof and reciprocated by pressure difference of the fluid between the fluid inlet and the fluid outlet, a fixed magnetic member positioned at a predetermined distance from the piston, and a detection sensor arranged in a position where the detection sensor is subject to alternate magnetic action from the magnetic member of the piston when the piston is reciprocated at a predetermined stroke, for detecting a flow of the fluid in response to change in the magnetic action.

Abstract: A gas inlet valve assembly for inflatable boats includes valve structure having at least one inlet opening and at least one outlet opening. A valve member is positionable between the inlet opening and the outlet opening to control the flow of gas through the valve. A gas dispersion member, preferably made of a porous material, is provided with the valve and is substantially adjacent to the valve outlet opening, such that gas emanating from the valve outlet opening will be thrust into contact with the gas dispersion member. The expanding, cold gas jet is dispersed by the porous material of the gas dispersion member. Direct contact between the cold gas jet and raft surfaces, together with freezing and cracking associated therewith, will thereby be substantially prevented. In a preferred embodiment, a pluraity of radially-disposed outlet valve openings are provided, and the gas dispersion member is substantially annular.

Abstract: An automatic air valve for a conduit, through which passes fluids and/or solids, which valve prevents the discharge of contaminated air therefrom into the environment and which further permits the introduction of fresh air from the environment into the conduit when a negative pressure develops therein. The valves may be disposed at either the terminus of or interposed within the conduit flow line of a duct system. The valves include an interior filter that restrains foreign objects, such as insects and snakes, in the duct systems from operatively interfering with the proper operation of the valve.

Abstract: A tire filter assembly (15, 400) for a central tire inflation system (10) having fluid communication (403) from the exterior to the interior of the pressurized chamber (74) of an inflatable tire (12). The assembly includes filter means (15) mounted to a cylindrical sleeve-type bead lock (400) inside the interior pressurized tire chamber (74). The location of the filter inside the tire permits it to have a relatively large area through which air can flow, and to prevent rubber particles that come off the inside of the tire from entering the central inflation system. The filter assembly is affixed by means of an adhesive (11) or a molding material to a groove (17) provided in the bead lock, and/or by mechanical means.

Abstract: A water tap, which comprises a housing having an outer cap mounted on its water supply outlet to secure therein a water intake cap, a control shaft, a control bolt and a ring-shaped element. The control shaft comprises an upper circular groove with a stop cock mounted thereon, and a lower circular groove with a ring-shaped water seal mounted thereon. When the control shaft is pushed upward, water flow is permitted to pass through water inlet holes on the water intake cap for discharging out of the outer cap. When pressure force is released from the control shaft, water flow is accumulated in the inner space of the water intake cap and the inner space of the control shaft permitting water pressure to force the control shaft to move downward so as to block up water supply. The control bolt can be turned to move up and down inside the control shaft so as to control the flow rate through the throughholes around the periphery of the control shaft.

Abstract: An automatic air valve for a conduit, through which passes fluids and/or solids, which valve utilizes a freely-movable valve member to prevent the discharge of contaminated air therefrom into the environment and to permit the introduction of fresh air from the environment into the conduit when a negative pressure develops therein. The air valves may be disposed at either the terminus of or interposed within the conduit flow line of a duct system. The air valves include an interior filter that restrains foreign objects, such as insects and snakes, in the duct system from operatively interfering with the freely-movable valve member. Means is also included for preventing the interior filter to move or to be moved into a position wherein the interior filter may operatively interfere with the freely-movable valve member. The interior filters are nonplanar in shape, so as to provide a total air passage area that is substantially the same as the air passage area that is present without the interior filter.

Abstract: In a power-operated valve in which the pressure of a working fluid is used to control the opening and closing of the valve member in dependence on the condition of an integral power-operated bleed valve, a compensation passage being formed in the valve member to permit working fluid to close the valve when the bleed valve is closed, the compensation passage is formed in that area of the valve member which is bounded by the valve seating and which also defines the cross-sectional area of the inlet chamber, whereby the closing force on the valve member is proportional to the area of the valve housing, thus enhancing the sensitivity of the valve. In a preferred embodiment, a filter is incorporated in the valve member to filter the working fluid to the compensation passage without filtering the bulk of fluid passing through the valve.

Abstract: A valve construction and method of making the same are provided, the valve construction comprising a housing, a valve seat carried by the housing, a movable lever carried by the housing and having an opening passing through opposed sides thereof, a valve member for opening and closing the valve seat and having a stem projecting through the opening of the lever whereby the valve member is carried by the lever, and a tubular member disposed in the opening of the lever and telescopically receiving the stem of the valve member therein whereby the tubular member spaces the stem from the lever at the opening thereof.

Abstract: A metal diaphragm valve comprises a valve cage, a metallic valve seat integral with the valve cage, a metal diaphragm having a peripheral edge portion supported in a liquid-tight manner by the valve cage and a central portion facing the valve to touch and leave the seat, a drive member for opening and closing the metal diaphragm, and a diaphragm pressing member interposed between the drive member and the metal diaphragm and adapted to press the diaphragm against the valve seat at a uniform sealing pressure.

Abstract: In a fuel gas supply equipment with an abnormal offensive odor suppressing filter, there is provided a gas supply passage from a gas outlet of a gas container containing LP gas such as propane gas to a gas inlet of a gas burner. The gas supply passage is provided with a pressure regulating means and a filter mounting portion disposed on the upstream side of the pressure regulating means. A cotton-like filter is inserted into the filter mounting portion. The gas inlet of the filter mounting portion and the gas outlet thereof are intercommunicated through the filter.

Abstract: An improvement of noncontrolling type valve for use in a gas-lighter, a portable cooking stove and other burners, which valve comprises a valve body push-fitted in a recess formed in the top plate of a gas container; and a filter positioned under the valve body to permit a given constant flow of gas to pass to the valve body when the valve opens. The valve is improved according to the present invention in that an annular spacer is fixed to the annular inside edge of the uppersurface of said filter, allowing the bottom end of said valve body to contact the remaining center area of the uppersurface of said filter. The coplanar positioning of the bottom end of the valve body with the annular spacer prevents deformation of the filter even if it is exposed to an increased gas pressure, thereby assuring that the gas flows through the filter at a controlled rate all the time.

Abstract: A noncontrolling type valve comprised, in the recess of the top plate of a gas container, valve means, a filter positioned below the valve means to permit a given constant flow of gas to pass to the valve means when opened, an annular spacer fixed to the filter and a net structure sandwiched between the filter and the bottom of the valve. The net structure is to prevent any displacement or deformation of the gas flow controlling filter, which displacement or deformation would be otherwise caused if the filter is exposed to an increased gas pressure, and then the valve could not keep the gas flow rate constant, and hence the flame length constant and stable. The filter can be put in position simply by push-fitting an associated annular spacer in the recess.

Abstract: A floor drain and trap organization is set forth including a housing provided with outwardly extending flanges for securement to an existing floor structure. A removable drain lid is provided with a series of circumferentially arranged apertures overlying a first drain channel in communication with an upwardly extending second drain channel for directing water flow into a medially positioned conduit extending upwardly through the housing and arranged below the drain lid. A variety of filtration screens are utilized dependent upon flow conditions in use of the organization.

Abstract: A drainage valve for use in pressure systems where pressure surges occur for draining an underground water system when the water pressure in the underground water system is off and for sealing the drainage valve against drainage when the water pressure is on comprising a housing having a first annular support and sealing surface and a second annular support and sealing surface for supporting a member that is nonextrudable through a drain passage in the drainage valve under normal operating pressures and surge pressures encountered in water supply systems and to permit said nonextrudable member to open said drain passage when the water pressure is off.

Abstract: A one way valve for flexibly walled packages is disclosed. The valve comprises a unitary valve body having an outer face with a raised anvil having a first valve seat surrounding a central depression. A generally planar surface is provided adjacent the anvil forming a second valve seat. The second valve seat terminates in an outer wall which includes a first marginal portion extending towards the anvil and a second marginal portion extending away from the anvil. An elastic diaphragm is also provided which seats on the second valve seat with at least a part of the diaphragm being below the first marginal portion of the outer wall. At least one aperture is provided through the valve body from the outer face to an inner face. The aperture opens at one end onto the second valve seat and at the other end onto an indented portion of the inner face. A filter is housed in the indented portion across the other end of the aperture opening.

Abstract: A top cartridge for an individual, sanitary, dual-control, shut-off valve is provided. The cartridge includes an upper stationary and a lower rotatable disk, each disk including port apertures. The disks are arranged with a defined clearance in the longitudinal direction of a driver pin. A driver is welded to the pin and includes a finger which engages the rotatable disk. The upper end of the pin is pressed within a spindle. The spindle is positioned within a bushing to prevent calcination and corrosion thereof. A seal is provided near the bottom end of the pin between the driver and the rotatable disk.

Abstract: In known pressure regulating apparatus, the pressure regulating valve placed in a holder is provided with a plunge-cut sealing groove for receiving a sealing ring. A filter is also disposed inside the pressure regulating valve. The novel embodiment of the pressure regulating apparatus is intended to make it easier to embody and install the seal between the holder and the pressure regulating valve. To avoid a plunge cut on the bottom part of the valve housing of the pressure regulating valve, the bottom part is provided with a step, defining one side of a sealing groove, while the sealing groove bottom is formed by a restriction extending as far as one end face of the bottom part. The sealing ring is defined on the other side by a ring, which is placed upon the restriction, and being connected with a filter disk extending radially inward and serves as a retaining means for the filter disk.

Abstract: An intake relief valve is provided with a gate in the form of a ball cock which rotates in a horizontal plane on a vertical axis by means of a swivel pin and sector gear turned by a worm gear and wheel. The gear box housing is at the top of the valve and its exposed upper surface carries the markings "close", "1/4", "1/2", "3/4", and "open". The swivel pin carries a needle indicator, exterior of the gear box, to move from one marking to the other to show the degree of opening of the valve. The ball cock closes the valve ports, one of which is screened. It forms an annular compartment with the valve housing through which liquid may pass to the pressure relief valve in the lower portion of the valve whether the ball cock is in open or closed position.

Abstract: A check valve with a disposable filter is provided for regulating the flow of a mobilizing liquid in a pump of a liquid chromatograph. The valve assembly includes two seated ball valve subassemblies securely housed in a casing to define a liquid flow path therethrough. A portion of one valve subassembly extends beyond the valve casing and is received by a valve end cap. The valve end cap has an aperture which is aligned with the flow path defined by the valve subassemblies. The apertured end of the end cap has a tapered perimeter for receiving a correspondingly tapered end seal. The end seal has an apertured end wall with a filter received in the aperture and is adapted to be removably mounted on the tapered edge of the end cap, thereby removably mounting the filter to the valve assembly and requiring only the force of the user's fingers to attach and remove the filter.

Abstract: A pressure reducer, especially adapted for the supply of very pure gas in the electronics industry, which comprises a final stage having an inlet, pressure-reducing means and a low-pressure outlet. A filter having a filtration threshold lower than a micron is interposed between the pressure-reducing means and the low pressure outlet.

Abstract: There is disclosed a compressed air delivery system for delivering clean, dry, compressed air from a source of compressed air to a compressed air appliance. The compressed air delivery system includes a vertical, cylindrical tank with an inlet located in the lower 1/3 of the tank and an outlet located near the top of the tank so that the air in the tank becomes stratified with the light, clean air at the top. The inlet to the tank includes in series a connector connected to a source of compressed air, a stepdown regulator, a check valve, an inlet port, and an inlet tube filled with packing material. The outlet of the tank includes in series a drop tube inside the tank, an outlet port, a shut off valve, a particulate filter, a coalescing filter, a stepdown regulator, and an output coupler.

Abstract: A disc used primarily in extruding machines positioned between a fluid strainer and a forming die. The disc includes multiple adjacent walls which define honeycomb passages for the fluid to flow through. The disc may serve as a support for the strainer, or with modifications, may be used to achieve other functions, such as fluid mixing and flow rate enhancing.

Abstract: A manifold for the application of agricultural ammonia includes an acceleraing chamber between an inlet and a plurality of discharge ports.

Abstract: A fluid filtering stop valve having a body with a cylindrical chamber having a circumferential sidewall with inlet, outlet and flush ports, and a cylindrical plug member rotatably disposed in the chamber. The plug member has spaced apart first and second circular plates with an off-center filtering screen extending therebetween. The plug member is rotatably between a filtering position in which the screen is located in the fluid flow between the inlet and outlet ports, a backflushing position in which the screen is located in the fluid flow between the inlet and flush ports, with the filtering side of the screen toward the flush port, and a closed position in which an arcuate plate washer loosely retained between the first and second plates is positioned to seal the flush and outlet ports. In the filtering position the washer seals only the flush port and in the flush position the washer seals only the outlet port. The screen uses outwardly diverging ribs to reduce lodging of material between the ribs.

Abstract: A valve assembly for a plate-type flow-control valve has a stationary plate having a planar upper face and formed with at least one inlet port and with an outlet port opening offset therefrom on the upper face and a movable plate having a planar lower face slidable on the upper face of the stationary plate and formed with a pocket open at the face and defined by a generally flat floor having an outer periphery and an annular side wall extending from the periphery to the faces. An annular screen in the pocket has an inner wall inward of the side wall and itself having a lower edge spaced slightly above the faces and an end wall extending outward from the lower edge to the side wall generally at the faces. This screen defines with the side wall and outer periphery of the floor an annular chamber extending in the pocket around the outer floor periphery.

Abstract: A faucet spring utilized to urge the faucet seal member into sealing contact with the rotatable valving member and prevent large debris, such as valve washer screws from previous faucet assemblies, from contacting the valving member under the fluid pressure. The coil spring has a substantially frusto-conical configuration with a smaller diameter upper end which engages the seal and urges it against the valving member. The larger diameter lower end of the spring engages an annular shoulder of the counterbored inlet passage of the valve assembly. The lower end of the spring also includes an obstruction member formed as an extension of the coil spring which extends into the opening of the spring's lower end to prevent large debris from traveling through the spring and seal. As a result, the faucet spring provides the added function of preventing potentially damaging debris from contacting the valving member.

Abstract: Disclosed is an air filter unit for a pressure actuator such as a vacuum actuator for a speed control of an automobile comprising a solenoid valve unit including a plurality of solenoid valves and a diaphragm unit including a diaphragm defining a pressure chamber, air pressure within the pressure chamber being adjusted by selective activation of the solenoid valves which communicate the pressure chamber with pressure sources of different pressure levels. A filter element holder defining a pair of receptacles for receiving filter elements therein is attached to the solenoid valve unit so as to intercept air flow from an external air source into the vacuum chamber by way of the solenoid valves. The filter element for a vent valve which is frequently used is finer in structure than that for a safety valve which is less frequently used and is required to be capable of rapid introduction of air into the vacuum chamber.

Abstract: Pressure reducer for ultra-pure gases with a solid, block-like casing body (1), which has a plurality of fluid channels (2, 2a, 2b, 2c) running radially towards the center of the casing body (1) connected to projecting tubular connecting pieces (3, 3a, 3b, 3c).To keep the pressure reducer completely free from gaps and dead spaces, the connecting pieces are constructed in one piece with the casing body.

Abstract: A heated, insulated cover for a portion of a pipeline with valve and backflow preventer components exposed to the atmosphere, the cover being sectionalized so as to be assemblable around the valve components, with hand manipulated clamps to hold the cover together, an electric heating element inside the cover to keep it above freezing temperature, drain openings in the cover at ground level to let any water drain out of the cover, doors in the cover to permit inspection and testing of the components when the cover is in place.

Abstract: A fluid filtering stop valve having a body with a cylindrical chamber having a circumferential sidewall with inlet, outlet and flush ports, and a cylindrical plug member rotatably disposed in the chamber. The plug member has spaced apart first and second circular plates with an off-center filtering screen extending therebetween. The plug member is rotatably between a filtering position in which the screen is located in the fluid flow between the inlet and outlet ports, a backflushing position in which the screen is located in the fluid flow between the inlet and flush ports, with the filtering side of the screen toward the flush port, and a closed position in which an arcuate plate washer loosely retained between the first and second plates is positioned to seal the flush and outlet ports. In the filtering position the washer seals only the flush port and in the flush position the washer seals only the outlet port. The screen uses outwardly diverging ribs to reduce lodging of material between the ribs.

Abstract: A male fluid control member for controlling aspiration flow is insertable in a standard female receptacle having an interior cylindrical recess including a vent line leading to the recess. The male member includes an open end intruding into the recess in the female receptacle and filled by a protruding resilient gasket having a central orifice. The end recess is in communication with an interior chamber that extends along the aspiration fluid flow path, but is sealed therefrom by a hydrophobic membrane of substantial cross-sectional area. In operating position the orifice in the gasket in the male member is aligned with the vent line and the gasket and membrane seal the conduit thus formed from external sources of contamination. The opening in the gasket diverges in the direction toward the membrane which, together with the interior chamber, has a substantial cross-section.

Abstract: A fluidic system is provided in which the laminar flow operating range has een increased. The fluidic system uses stacks of laminate plates in which filter means is placed between vent and exhaust laminates for breaking up eddies and flow noise created from supply nozzle and vent areas.

Abstract: An improved faucet drain assembly for preventing damage to a faucet due to freezing of residual water in the faucet upon exposure of the faucet to low temperature conditions. The faucet drain assembly comprises a faucet extension member supported by the faucet, the faucet extension member having a drain bore extending therethrough which is in fluid communication with the faucet, and a fluid valving assembly disposed in the drain bore and responsive to the flow pressure through the faucet.

Abstract: A valve construction and method of making the same are provided, the valve construction comprising a housing, a valve seat carried by the housing, a movable lever carried by the housing and having an opening passing through opposed sides thereof, a valve member for opening and closing the valve seat and having a stem projecting through the opening of the lever whereby the valve member is carried by the lever, and a tubular member disposed in the opening of the lever and telescopically receiving the stem of the valve member therein whereby the tubular member spaces the stem from the lever at the opening thereof.

Abstract: An automatic photographic processor having a filter provided in a circulating flow path of the processing liquid used in a developing tank. A control device calculates the total quantity of light-sensitive material processed by the liquid since the filter was last changed. The control device generates a warning signal when the total quantity reaches a predetermined value. An accoustical or optical warning device responsive to the warning signal indicates that the filter should be changed. A flowrate meter or pressure detection system in the circulating flow path checks the effectiveness of the filter and can also generate a warning signal for the warning device to indicate that the filter should be changed.

Abstract: A direct acting valve assembly including a valve body and a guide tube attached thereto. An insert is secured within the guide tube and includes a central aperture and at least one filtering aperture. The valve body includes an annular surface between an annular inlet and a centrally located outlet, and an annular seal is positioned in a central recess in the bottom of the insert and adjacent the annular surface to provide a fluid tight seal therebetween. The guide tube receives a closure member which has one end tapered to a point positionable through the central aperture of the insert and adjacent the annular seal. A spring and solenoid combination is operable to move the closure member between a first position displaced from the annular seal and opening the valve and a second position adjacent the annular seal and sealing the central passageway.

Abstract: A gas safety valve is provided which has a valve chamber within a housing, and a gas inlet and outlet respectively communicating with an inlet and outlet end of the valve chamber. Valve means are disposed in the valve chamber for allowing gas to flow from the inlet to the outlet when the valve means is in an open position, and preventing gas flow when the valve means is in a closed position at either end of the valve chamber. The valve means may comprise a piston having a tortuous gas transmitting opening therein, the resistance to gas flow caused by the tortuous opening rendering the valve means responsive to slight variations in gas pressure differential between the inlet and the outlet. Resilient means are provided which extend between the outlet and the valve means.

Abstract: The invention relates to an infinitely variable transmission provided with an endless transmission member and at least one V-shaped pulley of which at least one sheave is rigidly connected to a hydraulic cylinder-piston unit for the axial displacement of this sheave. The said cylinder-piston unit being provided with a pressure-equalizing chamber for the compensation of pressure rises in the cylinder space due to centrifugal forces. The pressure-equalizing chamber can be supplied with fluid from the cylinder space through a charging port. In order to overcome the drawback of particles obstructing regularly the charging port, ahead of the charging port a filtering member is provided through which the fluid flow must pass.

Abstract: A simple solenoid operated valve for use with water and other fluids includes a valve operating section and a valving section interconnected by an elongated plunger passing therebetween by way of a simple separator spaced between said sections including a valving means in said valving section adaptable of maintaining valve in a first normally closed position wherein, when a solenoid coil is not energized, an end of said plunger which is contoured closes an inside diameter of a seal which may be of O-ring configuration bubble-tight shut while when the solenoid coil becomes energized electrically, rendering valve open for fluid communication between a first fluid supply and a second fluid exhaust port means incorporated into a valve housing adaptable of being produced from metal or plastics economically.

Abstract: In an oil-flow regulator for vacuum pumps in milking systems, the amount of oil to be introduced is determined by the dimensions of an annular gap between a valve cone and a restrictor. The valve cone is attached to a diaphragm between the oil chamber and a partial-vacuum chamber that communicates with the suction line to the vacuum pump. When the vacuum pump is turned on, a partial vacuum builds up in the partial-vacuum chamber, forcing the diaphragm and the valve cone upward until the valve cone impacts against an axially adjustable stop. This establishes the oil flow. When the pump is turned off, the partial vacuum in the partial-vacuum chamber cancels out again, the valve cone blocks off the restrictor, an oil flow is interrupted. No oil can flow into the catch chamber when the pump is turned off and lead to an excessive rate of flow and excess oil consumption.

Abstract: A suction device for a fuel feed unit in which the suction device has a rigid suction tube on which a suction head is arranged. The suction head is formed as a conically widening elastic bellows having a large suction opening which faces the bottom with a screen arranged in the opening. As a result of the development as an elastic bellows, the suction opening is held resting with initial spring tension (i.e., resilient prestress biasing) against the bottom of the fuel tank.

Abstract: A heated, insulated cover for a portion of a pipeline with valve and backflow preventer components exposed to the atmosphere, the cover being sectionalized so as to be asemblable around the valve components, with hand manipulated clamps to hold the cover together, an electric heating element inside the cover to keep it above freezing temperature, drain openings in the cover at ground level to let any water drain out of the cover, doors in the cover to permit inspection and testing of the components when the cover is in place.