Abstract:
A carburettor for a two stroke engine includes a flow duct including rich and lean flow passages (160, 150) in parallel, through which, in use, air flows in a flow direction and which are separated by substantially planar partition (130). At least one fuel jet (5) communicates with the rich passage (160) and the partition includes an aperture (140) towards which the fuel jet is directed. A substantially planar butterfly valve (120) is received in the aperture so as to be pivotable between a first position, in which the flow duct is substantially closed and the aperture is substantially open, and a second position, in which the flow duct is substantially open and the aperture is substantially closed. The upstream half of the aperture (140) is defined by upstream semi-annular seating ledge (148) affording an upstream seating surface (151), which is engaged by one of the surfaces of the butterfly valve (120), when it is in the second position, and a first end surface (153), which extends between the upstream seating surface and that surface of the partition which is directed towards the lean passage. The downstream half of the aperture (140) is defined by a downstream semi annular seating ledge (149) affording a downstream seating surface (151), which is engaged by the upper surface of the butterfly valve, when it is in the second position, and a second end surface (161), which extends between the downstream seating surface and that surface of the partition which is directed towards the rich passage. At least one of the upstream semi annular seating ledge, the downstream semi-annular seating and the valve are so shaped that, in use, a pressure differential is created between the rich and lean passages at the upstream and/or downstream edges of the valve, the pressure in the lean passage being higher than that in the rich passage.
Abstract:
A reciprocating piston engine (2) includes an exhaust system comprising an exhaust pipe (8) which communicates with a silencer (10), whose upstream portion (11) is divergent in the direction of gas flow through it, an oxidising catalyst (12) and an air supply pipe (14) communicating with the exhaust pipe at a position upstream of the catalyst and silencer. The air supply pipe (14) includes a Reed valve (16) which is adapted to open under a pressure differential to permit air to flow into the exhaust pipe. In order to maximise the air flow into the exhaust pipe the effect of pressure pulses within the exhaust pipe is utilised and for this purpose 3L2−(2L1+L2) is equal to ±0.25 to 0.5 m, wherein is the distance from the junction of the exhaust pipe (8) measured from a first intersection point at which the axes of the exhaust pipe (8) and the air supply pipe (14) intersect, to a point midway along the length in the flow direction of the said upstream portion (11) of the silencer (10) and L2 is the length of the air supply pipe (14) from the Reed valve (16) to the said first intersection point.
Abstract:
A concentric well-type extractor tube having two concentric valves retained in a valve neck for filling containers, such as beer kegs, with pressurized beverages. The length of the valve neck is reduced so that the bottom of the valve neck is horizontally aligned with the top of a movable first valve assembly. The side openings of the depending basket portion of the extractor tube are raised to a position adjacent the first valve assembly. Therefore, beer filling an inverted keg can pass directly between a first valve seat and movable first valve member of the first movable valve assembly and thereafter through the openings in the basket and into the keg. This substantially shortens the beer flow path and eliminates the passage of beer through a constricted area found in prior art extractor tubes. Also, a transverse deflector plate serves to deflect beer from the center of the keg to the sidewalls, thereby substantially reducing turbulence during filling. The deflector plate can be retained on the siphon tube portion of the extractor tube, can be located within the depending basket portion of the siphon tube, or can be located on the top of the lip of the siphon tube adjacent the first valve seat, either as an extension of the lip or wedged between the top of the lip and bottom of the first valve seat.
Abstract:
The disperse monoazo dyestuffs of the formula: ##STR1## wherein T.sup.1 and T.sup.2 are each independently hydrogen or lower alkyl, Z is hydrogen, lower alkyl, or lower alkoxy, Y is hydrogen, lower alkyl, lower alkoxy, chlorine, bromine, --NHCOX.sup.1 or --NHSO.sub.2 X.sup.2, X.sup.1 is lower alkyl, lower alkoxy, amino or N-lower alkylamino, X.sup.2 is lower alkyl, A.sup.1 and A.sup.2 are each independently lower alkylene, R.sup.1 and R.sup.2 are each independently lower alkyl or hydroxyalkyl containing from 2 to 4 carbon atoms, and the benzene ring B can contain additional susbstituents apart from sulphonic acid groups, a process for the manufacture of the said dyestuffs, and their use for coloring synthetic textile materials in yellow to blue shades.
Abstract:
A process for the coloration of aromatic polyester textile materials which comprises applying to the said textile materials by an aqueous dyeing, padding or printing process a disperse monoazo dyestuff, free from carboxylic acid and sulphonic acid groups, which, in one of the possible tautomeric forms, is represented by the formula: ##STR1## wherein A is phenyl or phenyl which contains at least one substituent selected from chlorine, bromine, nitro, cyano, trifluoromethyl, thiocyano, lower alkyl, lower alkoxy, lower alkylcarbonyl, lower alkylsulphonyl, lower alkylcarbonylamino, carbamoyl and N-lower alkyl and N:N-di lower alkyl derivatives thereof, sulphamoyl and N-lower alkyl and N:N-di lower alkyl derivatives thereof, sulphamato and N-lower alkyl and N:N-di lower alkyl derivatives thereof, lower alkoxycarbonyl, lower alkoxy lower alkoxycarbonyl, lower alkoxy lower alkoxy lower alkoxycarbonyl, hydroxy lower alkoxycarbonyl, hydroxy lower alkoxy lower alkoxycarbonyl, and lower alkoxycarbonyl lower alkyl.X is hydrogen, lower alkyl, carbamoyl, cyano, chlorine, bromine, nitroso, nitro, lower alkylcarbonyl, sulphamoyl, lower alkylsulphonyl, lower alkylcarbonylamino or lower alkoxycarbonyl; andZ is hydrogen or lower alkyl;And subsequently giving the colored textile material a treatment in an aqueous alkaline bath at a pH above 8 and at a temperature between 50.degree. and 85.degree. C, whereby the textile materials are colored in greenish-yellow to red shades possessing excellent fastness properties.
Abstract:
Process for coloring aromatic polyester textile materials which comprises applying to the said textile material by an aqueous dyeing, padding or printing process an aqueous dispersion of a water-insoluble monoazo dyestuff of the formula:- ##STR1## wherein X is hydrogen or methyl, Y and Z are each independently chlorine or bromine, and R is lower alkyl, and subsequently subjecting the colored textile material to a treatment in an aqueous solution of sodium hydrosulphite whereby the aromatic polyester textile materials are colored in brown shades of excellent fastness properties.
Abstract:
A carburettor includes a primary air passage (19), an adjustable throttle valve (8) situated within the primary air passage, a fuel supply nozzle (28) communicating with the primary air passage and connected to a fuel metering valve for varying the amount of fuel discharged through the nozzle. The fuel metering valve includes an elongate sleeve (32) movably accommodating an elongate valve member (33). The sleeve and valve member define a fuel inlet space (35). A fuel inlet (37) communicates with the fuel inlet space. A fuel outlet (39) passes through the wall of the sleeve (32) and communicates with the fuel supply nozzle (28). A portion of the outer surface of the valve member (33) is so profiled that the valve member (33) is movable relative to the sleeve (32) such that the area of communication between the fuel inlet space (35) and the outlet (39) varies progressively between a maximum and a minimum value.
Abstract:
A carburettor including a primary air passage, an adjustable throttle valve situated within the primary air passage, a fuel supply nozzle communicating with the primary air passage and connected to a fuel metering valve for varying the amount of fuel discharged through the nozzle and a rotary input shaft adapted to be connected to an engine speed control member and which is connected to the throttle valve to move the throttle valve between open and closed positions. The rotary input shaft is also connected to a carriage to move the carriage, the carriage carrying at least one elongate inclined ramp which extends in the direction of movement of the carriage and which is engaged by a follower connected to the valve member. Rotation of the input shaft results in movement of the throttle valve and in movement of the carriage and thus of the elongate ramp, wherein the follower is moved transverse to the length of the ramp and the valve member of the fuel metering valve is thus also moved.
Abstract:
A carburettor including a primary air passage, an adjustable throttle valve situated within the primary air passage, a fuel supply nozzle communicating with the primary air passage and connected to a fuel metering valve for varying the amount of fuel discharged through the nozzle and a rotary input shaft adapted to be connected to an engine speed control member and which is connected to the throttle valve to move the throttle valve between open and closed positions. The rotary input shaft is also connected to a carriage to move the carriage, the carriage carrying at least one elongate inclined ramp which extends in the direction of movement of the carriage and which is engaged by a follower connected to the valve member. Rotation of the input shaft results in movement of the throttle valve and in movement of the carriage and thus of the elongate ramp, wherein the follower is moved transverse to the length of the ramp and the valve member of the fuel metering valve is thus also moved.
Abstract:
The carburetor (1) includes a flow duct including rich (60) and lean (50) flow passage in parallel, through which, in use, air flows in a flow direction and which are separated by a substantially planar partition (30), at least one fuel jet 5 communicating with the rich passage (60), the partition (30) including an aperture (40) towards which the fuel jet (5) is directed, and a substantially planar butterfly valve (20) being received in the aperture (40) so as to be pivotable between a first position, in which the flow duct is substantially closed and the aperture (40) is substantially open, and a second position, in which the flow duct is substantially open and the aperture (40) is substantially closed, the upstream half of the aperture (40) being defined by an upstream semi-annular seating ledge (48) affording an upstream seating surface which is engaged by one of the surfaces of the butterfly valve (20) when it is in the second position and a first end surface which extends between the upstream seating surface and that surface of the partition (30) which is directed towards the lean passage (50), the downstream half of the aperture (40) being defined by a down-stream semi-annular seating ledge (49) affording a downstream seating surface which is engaged by the other surface of the butterfly valve (20) when it is in the second position and a second end surface, which extends between the downstream seating surface and that surface of the partition (30) which is directed towards the rich passage.