GB216847A - Cylindrical steam distributor for direct action pumps - Google Patents

Abstract

216,847. Bronda, B. May 31, 1923, [Convention date]. Fluid-actuated gears. - A steam pump is provided with a fluid-actuated valve comprising solid heads 1, 2 which control a central admission 4, perforated heads 9, 10 controlling exhaust ports 13, 14, and ported extensions 15, 16 upon which fluids act to effect the initial movement of the valve. The main passages 7, 8 are connected to annular admission and exhaust ports 5, 6 in the valve chest. The extensions 15, 16 have auxiliary passages 19, 20 connecting the valve ends with annular recesses 17, 18 in the body of the valve. Crossed auxiliary passages 29, 30 connect the cylinder with the valve-chest ends. The valve is locked in its end position, and its final movements are cushioned. In operation, when the piston 31 moving to the left uncovers passage 29, the valve is thrown to the left. When the head 2 uncovers the right-hand annular port of passage 8 in its motion, the right-hand ends of the valve-chest are. opened to the main cylinder the pressure fluid in which acting on the head 2 completes the movement of the valve thus opening port. 14 and passing to exhaust meanwhile holding the valve in its reversed position. When either of the ports 13, 14 is opened, the end of the valve communicating with the end of the main cylinder put to exhaust is not immediately affected owing to the bore and length of the passages 27, 28. The throttled fluid thereby cushions the valve. In a modification, the passages 27, 28 are connected to the maincylinder ends, and the passages 7, 8 enter the main cylinder at some distance from the ends and have non-return valve-controlled branches leading to the cylinder ends. When the main piston passes the passages 7, 8, the exhaust is cut-off and the consequent compression effects the initial movement of the valve.