Abstract: An outside control type fan coupling apparatus has a double valve structure with plural oil supply adjustment holes. Temperature of engine coolant, acceleration of the engine, an air conditioner, vehicle speed and so on are parameters for controlling opening and closing valves of the oil supply adjustment holes. This rotation of the fan is fluctuated so that fan noises at the time of fan rotation fluctuation are suppressed. Also, if engine rotation accelerates to more than a certain level, the fan coupling apparatus is turned Off, and fan noise due to coupling rotation is prevented. Further, if engine rotation is less than a constant rotational speed, the fan coupling apparatus is turned Off, Middle, and fan noise due to coupling rotation of the fan at the time of acceleration and fan noise due to coupling rotation at the time of startup of the engine are prevented.

Abstract: In a fan coupling device in which the interior of a sealed housing supported and born by a rotary shaft having a driving disc secured thereto is separated by a partition plate having an oil supply adjusting hole into an oil reservoir and a torque transmission chamber in which the driving disc is contained and in which driving torque is transmitted to a driven side by oil supplied to the torque transmission chamber, a non-excited electromagnet utilizing a permanent magnet located in the oil reservoir of the sealed housing being supported around the rotary shaft, the valve member being actuated by the electromagnet to provide a mechanism for controlling the opening and closing of the oil supply adjusting hole.

Abstract: In a fan coupling device in which the interior of a sealed housing supported and born by a rotary shaft having a driving disc secured thereto is separated by a partition plate having an oil supply adjusting hole into an oil reservoir and a torque transmission chamber in which the driving disc is contained and in which driving torque is transmitted to a driven side by oil supplied to the torque transmission chamber, a non-excited electromagnet utilizing a permanent magnet located in the oil reservoir of the sealed housing being supported around the rotary shaft, the valve member being actuated by the electromagnet to provide a mechanism for controlling the opening and closing of the oil supply adjusting hole.

Abstract: A catalyst suitable for use in the preparation of 1,2-dichloroethane by oxychlorination of ethylene containing cupric chloride and, as a promotor, a combination of potassium chloride and cesium chloride, which can inhibit production of ethyl chloride by-product and has excellent selectivity to 1,2-dichloroethane and catalyst life.

Abstract: A cylindrical molded catalyst suitable for use in fixed bed reaction having a particular size of 3 to 6 mm. in outer diameter of the circle, at least 1.0 mm. in inner diameter of the circle, at most 1.5 mm. in wall thickness and 3 to 6 mm. in height. The molded catalyst has small resistance to fluid, large effective surface area, good heat conductivity and sufficient mechanical strength, and can produce excellent conversion and selectivity.

Abstract: A process for removing ethylene and vinyl chloride from a gas stream containing them by passing a mixed gas containing ethylene, vinyl chloride and a necessary amount of chlorine through a fixed-bed reactor charged with as a catalyst an activated alumina supporting at least 4% by weight of ferric chloride in terms of iron, said catalyst having an outer surface area per unit packed catalyst volume of not less than 7.8 cm..sup.2 /ml. Ethylene and vinyl chloride are converted into and removed as 1,2-dichloroethane and 1,1,2-trichloroethane. The concentrations of ethylene and vinyl chloride can be decreased to not more than 10 p.p.m. and not more than 20 p.p.m., respectively.