Patent GB-862509-A (GB)
Title: Improvements in or relating to fluid control valves and apparatus incorporating fluid control valves
Inventor: BINNS PHILIP GORDON
IPC: F02K9/56
Filed: 1958-01-21
Abstract: 862,509. Valves. ROLLS-ROYCE Ltd. Jan. 21, 1959 [Jan. 21, 1958], No. 2099/58, Class 135. [Also in Group XXVI] A valve comprises a valve body made in two parts 32, 33, a butterfly valve member 35 housed within the body part 32 and actuated by a pneumatic ram 52 and an annular sealing member comprising a flanged ring 38 and a pair of cylindrical sleeves 39, 40 which is slidable in a fluid sealed manner within the housing between an operative position in which the flanged ring 38 abuts the closed butterfly valve member to provide a fluid-tight seal around its periphery and an inoperative position in which the annular sealing member is clear of the butterfly valve member to permit its angular adjustment away from the closed position. The pneumatic ram for actuating the butterfly valve member is controlled by a solenoid-operated control valve 62 having a pair of solenoids 69, 70 independently energized to move the valve member 71 either to the left or right, whereby air under pressure from an air bottle and entering the valve at 61 is directed to above or below the piston 52. The annular sealing member is also pneumatically operated, the flange 38d acting as a piston member subject to fluid pressure either through the union 43 to move it to the right or through union 45 to move it to the left. The sealing member is also biased to the right by a spring 49. In addition, fluid entering the valve at 30 acts upon the flanged ring 38 through ports 47 in the cylindrical sleeve 40 tending to move it to the left. The unions 43 and 45 are connected by pipe lines 67 and 68 to the cylinder 51 of the pneumatic ram in such a manner that, for example, when it is desired to open the butterfly member, pressure fluid fed to the underside of piston 52 by pipe line 64a also passes along pipe line 67. to withdraw the sealing member from contact with the butterfly valve member. In the closing direction of the piston 52, the piston finally uncovers the port leading to pipe line 68 permitting pressure fluid to move the sealing member to the left to seal the butterfly valve member after it has closed. The butterfly valve is normally limited in its closing direction to a half-closed position by a nose member 55b engaging a detent member 57. The nose member 55b is located on a catch 55 carried by the pivot 54 between the piston rod 53 and the actuating arm 37, the catch being spring urged in the direction of arrow 56 to engage a shoulder 37a on the arm 37. The detent member 57 is restrained by a solenoidoperated bolt 59. The detent member 57 also maintains a valve member 75 in the closed position against the pressure of fluid from a bottle 25, Fig. 1, containing air under very high pressure (2000 p.s.i.). To close the butterfly valve fully and rapidly, the solenoid 60 is energized to withdraw the bolt 59. This permits the valve spindle 74a to move downwards blanking off the pipe line 63 by the valve member 77 and opening pipeline 63a to highpressure fluid from the bottle 25. At the same time the detent 57 is moved out of the path of the nose member 55b allowing the butterfly valve member to be moved rapidly to the fully closed position by the action of the high-pressure air on the top surface of piston 52. To prevent excessive build-up of pressure upstream of the valve 35 a burster disc 82 may be provided. One application of such butterfly valves 17, 21 is to control, respectively, the supply of liquid fuel from a tank 15 and oxidant from a tank 19 to a rocket motor 10. The fuel and oxidant are pressurized by pumps 16, 20 and the pressure air for operating the valves as described above is drawn from bottles 23, 25.