Abstract: A non-alloy steel component is nitrocarburized at 550.degree. to 720.degree. C. for up to 4 hours in a nitriding gaseous atmosphere e.g. ammonia or ammonia and endothermic or exothermic gas, and is thus exposed to air or other oxidizing atmosphere for 2 to 120 seconds to form an oxide-rich layer thereon before being quenched into an oil/water emulsion, degreased and a tack-free wax coating applied. Alternatively, the component may be cooled in air or other oxidizing atmosphere and then wax coated or it may be cooled in a non-oxidizing atmosphere and then reheated to provide the oxide-rich surface layer before being cooled again and wax coated. As a further alternative, the component may be cooled, lapped to a surface roughness of not more than 0.2 micrometers Ra, reheated to oxidize and then quenched. These techniques give a good corrosion resistance to the component.

Abstract: This invention relates to a polymerization reaction vessel having a coating on the inner surfaces thereof resulting from applying thereto an aqueous coating solution of an alkali metal or ammonium salt of the reaction product or oligomers of an aromatic aldehyde, such as benzaldehyde, and the like, and a polyhydric phenol, such as resorcinol, and the like. When polymerizing olefinic monomers, such as vinyl halides, vinylidene halides, and vinylidene monomers having at least one terminal CH.sub.2 .dbd.CH< group, and mixtures thereof, while a contact with said coating, polymer buildup on the inner surfaces of the reaction vessel is substantially eliminated.

Abstract: To impart good salt spray corrosion resistance to alloy steel components, such components are gas nitrocarburized at 550.degree. C. to 800.degree. C. to produce an epsilon layer, oxidized to produce an Fe.sub.3 O.sub.4 layer not more than 1 micrometer thick, quenched into an oil/water emulsion, degreased and then wax coated. The steel components may be surface finished after nitrocarburizing.A carburizing, carbonitriding or neutral atmosphere heat treatment may be effected prior to nitrocarburizing heat treatment with both heat treatments being effected at above the pearlite to austenite transformation temperature.

Abstract: A non-alloy steel component is nitrocarburized at 550.degree. to 720.degree. C. for up to 4 hours in a nitriding gaseous atmosphere eg. ammonia or ammonia and endothermic or exothermic gas, and is thus exposed to air or other oxidizing atmosphere for 2 to 120 seconds to form an oxide-rich layer thereon before being quenched into an oil/water emulsion, degreased and a tack-free wax coating applied. Alternatively, the component may be cooled in air or other oxidizing atmosphere and then wax coated or it may be cooled in a non-oxidizing atmosphere and then reheated to provide the oxide-rich surface layer before being cooled again and wax coated. As a further alternative, the component may be cooled, lapped to a surface roughness of not more than 0.2 micrometers Ra, reheated to oxidize and then quenched. These techniques give a good corrosion resistance to the component.

Abstract: A tractor hydraulic control system of the kind comprising a power lift with a hydraulic actuator (12) and a main control valve (17) controlling the supply of fluid from a pump (19) to the actuator, the system including selector valve means (50) interconnected with the main control valve (17) and movable between a first position in which flow to and from the actuator (12) occurs via the selector valve means under the control of the main control valve and the associated system control mechanism (28) and a second position in which the actuator is hydraulically locked in a given position and an external services outlet (51) is placed in communication with the pump. Linkage means (60,61,62) operatively connects the selector valve means (50) and the system control mechanism (28) to condition the main control valve (17) to cause the pump (19) to supply fluid to the external service outlet (51) via the selector valve means on movement of the selector valve means to the second position.

Abstract: The invention pertains to apparatus for connecting to a wellhead structure. Lower and upper female bodies define first and second receptacles disposed generally in coaxially aligned, end-to-end, communicative relation. A male body is received in both receptacles. The male body and upper female body have respective sets of inductive electric couplers matched in one-to-one relation. Several features facilitate effective use of such couplers: the couplers themselves have the edges of their heads chamfered from a point located just outwardly of the O.D's of their cores; an improved mounting arrangement aligns the two female bodies in stacked relation without the lower female body interfering with proper seating of the male body in the upper female body; an improved compensator system enhances play of one female body for precise centering with the other.

Abstract: A system for purifying water includes a perforated member disposed within a container confining water therein, the perforated member being spaced above the bottom of the container. A pump transfers water between an upper portion of the container above the perforated member and the bottom of the container below the perforated member to recirculate the water, and the recirculated water is aerated. A bacteria culture bed overlies the perforated member and includes a mixture of gravel, clay and other material or materials, such as skeletal residue material and readily decomposable vegetal material. The pump includes a sump box containing water therein and a pumping device mounted therein. The pumping device includes an impeller mounted within a housing disposed within the water in the box. A shaft extends through an opening in the housing, and the impeller is fixed to the lower end portion of the shaft.

Abstract: A system for purifying water includes flowing the water through a closed path, supporting a bacteria culture in the path of water disposed transversely thereto, and aerating the water in the path upstream of the bacteria culture to enable it to purify the water. In one form of the invention, the water being purified may be flowing through an aquarium for containing fish and/or other aquatic life. In another form of the invention, the water being purified may be flowing through a fish pond or swimming pool.