Patent GB-621021-A (GB)
Title: Improvements in, or relating to, valves
IPC: F16K3/04
Filed: 1945-03-01
Abstract: 621,021. Control valves. EATON, J. March 1, 1945, Nos. 5073 and 18388. [Class 135] A control valve has a body 1 with a flat end face 4 having an uncontrolled inlet port an exhaust port and a number of additional ports, the latter with the exhaust port being arranged along an arc of a circle and being selectively controlled by a slidable valve member 33 having an arcuate channel 39 and arranged floatingly between the end face 4 and a radial arm 20 carried by an operating spindle 13 rotatably mounted in the valve body and projecting through the ported end face thereof into the fluid pressure chamber 3 in which the ports open. As shown in Figs. 1 and 2, the chamber 3 is formed by screwing a cap 2 over the ported face 4 of the valve body which is formed with a supply passage 5, an exhaust passage 6 and two delivery passages 7, 8. The passages 5 and 6 terminate in transverse through passages 9, 10, the ends of which, not in use, being closed by screw plugs. The passages 7, 8 connect with transverse passages 11, 12 opening on opposite sides of the body 1. The operating spindle 13 has an enlarged portion 14 to which is screwed the radial arm or quadrant 20, the projecting end of the screw 21 serving to locate the end of a spring 23 seated in a recess 22. The spindle 13 and the quadrant 20 are prevented from relative rotation by a key and keyway 32, Fig. 5, in their adjacent faces. The valve is operated by a handle 17 secured on a non-circular part of the spindle 13 by a nut 18. The handle is automatically restored to a central position in which the valve member 33 covers the ends of the passages 6, 7, 8 by a spring-loaded ,plunger 27 engaging a flat bottomed recess cut in the spindle. A screw plug 29 prevents the plunger 27 being moved entirely out of the bore for the spindle 13 and so limits the move. ment of the spindle in either direction. The valve member 33 itself is of arcuate form and its arcuate recess 39 in the central position embraces the ends of all the passages 6, 7, 8 so that both delivery passages are then vented, pressure fluid being supplied to one of these passages when it is uncovered by the valve member 33, from the uncontrolled supply passage 5. The quadrant 20 and the valve member 33 are connected for limited play by two or more pins 34 loosely engaging sockets 35 in the valve member, the latter being pressed against the face 4 by the fluid pressure and by a spring 36 engaging recesses 37, 38. In the modification, Figs. 6, 8, the spindle 13 is actuated in opposite directions by two camoperated push rods 41, 42 engaging a rocking lever 40 fixed on the spindle, the rods 41, 42 being slidably mounted in a bracket 43 anchored to the valve body by a plug 29a somewhat longer than the plug 29, Fig. 1. The recess 25 has three mutually-inclined faces 26a on its bottom so that the spindle may be located in any one of three positions. Also the delivery passages 7, 8 in the valve body are further apart than shown in Fig. 2 so as to be normally open to the passage 5. Numerous modifications may be made by making different selections from the two differently drilled valve bodies, the two alternative spindles and the two alternative forms of spindle actuating means. According to the earlier Provisional Specification the quadrant may be secured to the spindle by a nut engaging a threaded part of a square-sectioned shank on the spindle which engages a similar hole in the quadrant. Also the valve body may be formed with a lip or flange to enable it to be mounted in either a vertical or a horizontal position. The working faces of the valve and its seat may have a hard chrome layer or coat. According to the later Provisional Specification, the valve member may be replaced by one of different arcuate length which leaves the ends of both delivery passages open in its normal position.