Abstract: A valve assembly has an elongated tubular body having a fluid passageway axially therethrough providing first and second end ports with a floating valve seat and an engageable poppet disposed in the fluid passageway of the body between the ports thereof and spring means disposed on the body for yieldably biasing the valve seat into engagement with the poppet and other spring means disposed in the body for yieldably biasing the poppet into engagement with the valve seat; a central abutment is disposed in the body between and engageable by the floating valve seat and poppet for restricting the movement of each of the floating valve seat and poppet toward the other thereof under the influence of both spring means.

Abstract: A heat trap assembly to prevent heat loss in the cold water inlet and hot water outlet piping systems of hot water storage vessels. The assembly consists of a heat sealing member normally located against a seat within the piping system of the cold water inlet to close off loss of heat by thermal circulation from the hot water in the storage vessel when no cold water is flowing through the piping and into the storage vessel and a second heat sealing member located against a seat within the piping system of the hot water outlet to close off loss of heat by thermal circulation from the hot water in the storage vessel when no hot water is flowing from the vessel. The heat sealing members are moved from their respective seats when water is flowing through the piping and stops are provided which confine the longitudinal movement of the respective heat sealing members.

Abstract: The invention contemplates a particular body construction and assembly for a check valve or the like whereby the entire valve assembly may be readily installed as a unit within the bore of standard pipe or conduit, or a standard fitting therefor. A single circumferentially extending radially inwardly open groove in the bore of the pipe, conduit or fitting, faces a corresponding radially outwardly open groove in the valve body, and stiffly compliant circumferentially extensive retainer element such as a wire of suitable gage substantially fills these grooves to retain the inserted valve in place. The retainer element is adapted for ready removability, to enable servicing or removal of the inserted valve, and the valve body is so externally characterized as to unambiguously assure valve installation in the correct direction of desired flow.

Abstract: A valve assembly for preventing a column of drilling fluid from spilling out of the lower end of a kelly includes an elongated body which has an axial opening and is threaded at both ends. A cam is rigidly mounted in the bore and a hollow piston in the opening is mounted for axial movement relative to the cam, the piston being shaped so that fluid pressure in the body will exert a downward force on the piston. A valve element is pivotally mounted in the piston (the piston inner surface defining a valve seat) and movable between a lower-closed position when the valve element is above the cam and engages the seat to an upper-open position where the cam engages the valve element and holds it away from the seat. A spring urges the valve element toward the closed position and the piston is urged upwardly in the bore so that the valve element is normally in its closed position.

Abstract: A valve for repetitively allowing and preventing upward fluid flow through a casing string. The valve is convertible from a locked open position permitting reverse upward fluid flow therethrough to a check valve position preventing upward fluid flow therethrough by flowing fluid downwardly through the casing to actuate an indexing J-slot mechanism interconnecting the spring-loaded valve member and the valve body assembly. The valve may be recycled to the locked open position from the check valve position an unlimited number of times through the flowing of fluid in a forward direction downwardly through the casing string.

Abstract: The invention is a differential fill valve apparatus principally for use in treating earth wells, usually in connection with cementing a string of casing into the well bore. The apparatus, at or near the low end of the casing, has a pressure actuated slidable piston which rises as liquid is encountered in the well bore opening parts for admitting liquid into the casing until the pressure from liquid in the casing reaches a predetermined ratio with respect to the pressure in the well bore annulus.Means are provided for locking the piston in its closed position after the casing string is in place in the well, permitting the use of the apparatus as conventional cementing valve apparatus.

Abstract: The invention concerns down-hole apparatus for use especially in casing cementing operations wherein a so-called string of casing is lowered into a well bore and cemented in place. The apparatus comprises an insert, disposed across the interior of the casing, containing a spring loaded flapper valve assembly which is held open by a movable valve seating member until a ball is seated in the seating member and pressure applied through the casing to the sealed valve seating member forces the seating member downward, releasing the flapper valve, and expands the lower end of the seating member as the ball is forced through it. On release of the casing pressure from above, the flapper valve closes.A plurality of the inventive devices may be placed along the casing, the ball valve sealing each, in turn, from top to bottom.

Abstract: A valve for repetitively allowing and preventing upward fluid flow through a casing string. The valve is convertible from a locked open position permitting reverse upward fluid flow therethrough to a check valve position preventing upward fluid flow therethrough by flowing fluid downwardly through the casing to actuate an indexing J-slot mechanism interconnecting the spring-loaded valve member and the valve body assembly. The valve may be recycled to the locked open position from the check valve position an unlimited number of times through the flowing of fluid in a forward direction downwardly through the casing string.

Abstract: A device that is in communication with the air intake valve of a carburetor of an internal combustion engine to inject a mist of water into the air fuel mixture formed by the carburetor, which water when in the zone of combustion in the engine reacts with carbon monoxide and free carbon therein to form carbon dioxide and hydrogen. The hydrogen so formed reacts with oxygen in the air-fuel mixture to form water that is either discharged in the exhaust from the engine or reacts with additional carbon dioxide and carbon in the zone of combustion to produce further carbon dioxide and hydrogen that continues until the carbon dioxide and water are discharged in the exhaust from the engine. The device when operating not only lowers the content of carbon-monoxide in the exhause discharged from the engine, but also tends to remove and minimize the depositing of carbon on spark plugs and in the cylinders of the engine.