Patent GB-497926-A (GB)
Title: Fluid control device
IPC: F22D1/42
Filed: 1937-03-31
Abstract: 497,926. Fluid - actuated valves ; injectors. GUTHMANN, E. Y. March 31, 1937, No. 9201. Convention date, April 3, 1936. [Class 135] [Also in Group XXVIII] A fluid-control device for controlling flow from a plurality of sources at least one of which is of a fluctuating character is adapted to delivery fluid from this source as long as it is adequate for requirements and to change over automatically should the supply prove inadequate. Fig. 1 shows the invention applied to a feed water heater for a steam generator supplied with both live and exhaust steam. The casing, which has an inlet connection 2 for water and a connection 3 for exhaust steam, is closed at the top by a removable cover 4 integral with a central tubular member 5 depending into the casing and closed at the lower end by a conical part 6. An axially arranged tube 8 secured to the closed end is connected to the live steam supply pipe. A tubular member 7 adjustably loaded by a spring 17 slides between the members 5 and 8 and is coupled by a cross-pin 19 with an outer member 24 slidably mounted about an enlargement 25 of the member 5. Pieces 27 slidably mounted in slots in member 5 are interposed between the parts 7 and 24. The Figure shows the device in the inoperative position. When live steam is admitted to the conduit 8 it passes through an elongated port 45 in the tube 8 through a passage 46 in the sleeve 7 to the chamber 47. As the outlet 48 from this chamber is restricted, pressure builds up beneath the sleeve lifting it against the action of the spring 17 until the supply through the passage 46 is reduced to the amounts passing through the passage 48 and a second exhaust passage 54 exposed by the end of the sleeve. In this position a port 49 in the sleeve 7 is brought opposite ports 51, 52 to permit live steam to pass from the pipe 8 to the space 53 whence it passes between the coned ends of the members 5 and 24 to mingle with water entering through ports 35 uncovered by the upward movement of the sleeve 24. At the same time exhaust steam entering at 3 passes through perforations in a baffle 39 to a space 44 and thence through passages 55, 56 to the space 57 beneath an enlargement on the sleeve 7, and at the same time acts on a shoulder 29 on the sleeve 24. Should the pressure of the exhaust steam be sufficiently high the lift of the sleeve 7 is increased, the supply to the space 57 being maintained by an elongated port (not shown) in sleeve 24 co-operating with a port (not shown) in the member 5. This increased movement interrupts the supply of live steam and moves ports 61 in the sleeve 24 above the end of the mixing tube to permit the entry of exhaust steam. The device is rendered inoperative by momentarily interrupting the exhaust steam supply and shutting off the live steam supply, or it may be mechanically moved to the closed position against the steam pressures by a sliding member 62 engaging one of the pieces 27. A draw-off cock 64 controls the discharge of condensate. In a modification shown in Fig. 6, exhaust steam is fed to the chamber 57 in all positions of the device through passages in the pin 19a. In a further modification the control device is applied to a forcing injector where a continuous supply of live steam is supplemented by exhaust steam or by additional live steam. In this form the ports controlling the water supply are omitted.