GB199024A - - Google Patents

Abstract

199,024. Aktiebolaget Arca Regulatorer. June 9, 1922, [Convention date]. Cleaning pins. - Hydraulically-operated regulating devices are provided with means for preventing the clogging of restricted passages therein. In the form shown in Fig. 1, comprising a slide valve 4 actuated by a spring-controlled diaphragm 1 for controlling communication between an hydraulic cylinder and inlet and exhaust passages 5 and 6 in accordance with the pressure in a chamber 3, an arm 11 carried by the slide valve is provided with a pin 10 disposed in the aperture 8 between the passage 5 and the chamber 3. In a modification, the passage 8 may be in the end of the piston, which has an axial passage leading to the chamber 3, and the pin is fixed to the end of the casing. The pin may be coned or provided with annular notches, or may be rotary and provided with vanes disposed in the restricted passage. In further forms, communication between the passage 5 and the chamber 3 is effected through the space between the slide valve and its guide, or through a channel 14, Fig. 11, in the guide or the valve, the movement of the valve serving to keep the passage clear.