Patent GB-731808-A (GB)
Title: Improvements relating to rotary plate valves
Inventor: ANSTEE HUBERT YORK
IPC: B01J47/14
Filed: 1951-11-02
Abstract: 731,808. Valves. PERMUTIT CO., Ltd. Nov. 3, 1952 [Nov. 2, 1951], No. 25715/51. Class 135. In a rotary plate valve, a single control member on rotation either in one direction or first in one direction and then in the opposite direction, successively causes the valve plate to move axially away from a ported seating base, rotate relatively to the base to a different valve setting and then move axially towards the base to reseat thereon. As shown in Figs. 1, 2, a valve plate 8 comprising a metal disc 12 and a rubber disc 14, is connected by a universal joint 22 to an operating spindle 24 and co-operates with a base 2 having ports 6 leading to passages 4. The plate is formed with circumferential ports 18 and an arcuate recess 16 which can span a pair of adjacent ports 6. A pin 34 through the spindle 24 pivotally mounts levers 36, 38. The lever 36, loaded by a spring 49, coacts with a cam face 44 on a member 32 connected to a rotatable hand wheel 28 and also with slots 50 formed in the flange 48 of a member 30 fixed to the valve casing; One arm 42 of the lever 38 coacts with the cam face 44 and with a cam face 46 formed on the member 32 and its other arm bears on a washer 40. On rotation of the hand wheel 28 through 270 degrees, the cam 44 gradually raises the end 42 of the lever 38 to move the spindle 24, together with the valve plate 8, away from the base 2 against a spring 25. Towards the end of this rotation, the cam 44 engaging the lever 36 moves it partially out of engagement with one of the slots 50 in the member 30, and a pin 58 fixed to the member 32 pushes the lever up an inclined surface 56 to enable the lever to be engaged by a projection 60 on the boss 62 of the hand wheel and so rotate the valve plate to a new setting until the lever 36 urged by its spring 49 drops down a step on the cam 44 to disengage the lever from the projection 60 and engage the next slot 50. On rotation of the hand wheel 28 through a further 90 degrees, the lever 38 runs down the cam 46 to reseat the valve plate 8 on the base 2. In another em. bodiment, Figs. 6, 7, 8, the operating spindle 70, which carries the valve plate, passes through a sleeve 72 secured to a control handle 74 and is formed externally with left-handed threads 78 for engagement with the valve housing 80. A groove 76 in the spindle co-operates with a plate secured to the handle so that on rotation of the handle the spindle may be moved axially. A pawl 82 on the handle engageable with a ratchet-wheel 84 secured to the spindle carries a roller 89 which co-operates with a fixed plate 90 and movable plates 92, 94. The plate 92 formed with an oval slot 96 and a lug 106 carries a spring-loaded pin 98 passing through a slot 100 in a fixed bracket 102 and a roller 112 engageable with a cam plate 110 carried by the ratchet-wheel 84. Engagement of the lug 106 in a slot 109 in the plate 90 and in one of several notches 114 in a disc 108 prevents rotation of the plate 90 and spindle 70. On turning the handle 74 clockwise through about 60 degrees, the spindle 70 moves axially to the left; arid the cam 110 engages the roller 112 to urge the plate 92 downwards to disengage the lug 106 from a notch 114. The pawl 82 then drops down a step on the plate 90 to engage the ratchet-wheel 84 and so rotates the spindle 70, the lug 106 then being held out of engagement of the slot 109 by the disc 108 until the lug comes opposite to another notch 114 whence the spring-loaded pin 98 urges the plate 92 upwardly to prevent any further rotation of the spindle. On then rotating the handle 74 anticlockwise, the spindle returns axially to its initial position, the cam 110 on coming opposite to the roller 112 rocks about its pivot 118 and so has no effect on the plate 92. The plate 94 pivoted at 122 to the plate 90 is controlled through a pin-and-slot connection 124 by the plate 92 so that rotation of the spindle beyond 60 degrees disengages the pawl 82 from the ratchet-wheel 84 to prevent further rotation of the spindle. In a further embodiment, Figs. 9, 10, the operating spindle 130 carrying the valve plate has a pin-and-slot connection 132 with an axially fixed but rotatable member 134 and a threaded connection 136 with a hand wheel 138. The member 134 is made in separate halves held together by bolts 140, one of the bolts carrying a lever 142 engageable with one of several notches 154, 155 formed in a rotatable disc 146 and a fixed member 144 respectively, and with lugs 158, 162 on the hand wheel. A spring 152 anchored to the disc 146 and a fixed pin 148 engageable in an arcuate slot 150 in the disc 146 urges the disc 146 anticlockwise. On anticlockwise rotattion of the hand wheel, the spindle moves the valve plate away from its seating base until the lug 158 engages the lever 142 which latter is then rocked to disengage the lever from a notch 154. The spring 152 then rotates the plate 146 anticlockwise to the extent of the slot 150 to move the notches in the plate 146 out of register with those in the member 144. The hand wheel is then rotated clockwise so that the lever 142 rides on the rim of the disc 146 and into contact with the lug 162 to rotate the spindle 130 and hence the valve plate to its new setting until a projection 156 on the disc 146 associated with each notch 154 rocks the lever 142 and drops into the next notch 154 to prevent further rotation of the spindle, the notches in plate 146 and the member 144 again being in register. Further clockwise rotation of the hand wheel moves the spindle axially to reseat the valve plate on its seating base.