Abstract: A filtration module comprises a housing and a bundle of inorganic filtering membranes disposed in the housing. At each end of the bundle a support plate assembly holds the membranes in proper relationship. Each support plate assembly comprises outer and inner plates and a sealing plate sandwiched therebetween. Each membrane extends through aligned holes in the three plates. The sealing plate, formed of an elastomer, includes outer and inner portions and an intermediate portion situated therebetween. The intermediate portion is in sealing relationship with the membranes. The intermediate portion is softer than the outer and inner portions, the Shore A hardness value of the intermediate portion being no greater than about 55, and that of the outer and inner plates being no less than about 65.

Abstract: The invention relates to a monocrystal pulling head.A carriage carrying the vertical pulling spindle, in which is placed a weight transducer, moves parallel to said axis under the action of a torque motor, which is controlled in position and speed and which is directly connected to the threaded rod of a screw - nut system. During its displacement, the carriage is guided by a rail, on which roll at least two pairs of rollers. A torque motor is mounted in the carriage for directly rotating the pulling spindle. Thus, the spindle displacement speeds are very accurately controlled. An electronic system integral with the pulling spindle processes the signals from the weight transducer. Contactless means make it possible to supply the electronic system, feed the useful information to the fixed parts and return thereto control instructions.