US2048696A - Reversing valve - Google Patents

Description

H. HELLAN REVERS ING VALVE July 28, 1936.

Filed April lO, 1930 f ff INVENTOR. ,Z/

A TTORNE Y.

Patented July 28, 1935 smear ossles nEvEasiNo VALVE Haakon Hellan, Chicago,l lll. Application April V10, 1938, Serial No. 443,090

3 Claims. 'My invention relates to reversing valves for regenerative furnaces. x

My invention-relates to the control of air to andwaste gas from regenerative furnaces, such -asbpen hearths and glass tanks. VIt belongs to the class of valves using a damper (gate valve) sliding against a Water cooled metallic seat forv shutting 01T and opening to stack in the underground flue system,where temperatures range around 1500 F. Present practice oiers dampers of different construction. Brick dampers in metal frames are porous. A solidly cast metal damper, Whether in one piece or in sections, will warp and cause leaks. All-Water cooled dampers of tight box construction require clean water to avoid settling out of sediments, and large quantities of the water on account of the large exposed area to the heat.

One object of my invention is to provide a damper construction that insures tightness by Water cooling, but reduces water requirements to cooling of contacting parts only, and by its construction permits the use of raw water in constant circulation.

Another object is to construct the main area of the damper of a light metal plate to withstand the heat, and avoid the heat losses from excessive water cooling.

Another object is to provide an arrangement of damper and the air inlet into one vertical iiue passage, principally for saving of oor space,

sage to regenerator flue, said passage having one side formed by the damper.

Another object is to provide a gate valve with novel cooling means comprising a metal frame approximating the size and shape of the seat l and provided with a removable plate covering the frame opening.

Referring to the accompanying drawing, Fig. 1 is a. vertical section of the valves and adjacent elements for one side of a regenerative furnace, parts being in elevation. Fig. 2 is a section on the line 2--2 on Fig. 1.

On the drawing, I is a damper adapted to the seat 2 between the regenerator iiue 3 and the stack ue Il. 5 is a passage by which all.' iS. Qonducted to the flue 3 after passing through the conduit 6 and the valve-chamber;1. A vertically-reciprocating `valve 8 of thesaucer or 'cone'V type is adapted to close the valvev seat9-in the bottom of thechamber 1. Y l 5` The seat 2 is a metal, frame having therein a water cooling passage I8 provided with the inlet'an'doutlet ducts II and I2. Thevdamper'comprises'al-metal frameV I3 having substantially the shapeand size of the seat 2. This frame is pro- 10 vided With a Water cooling passage lI4, having-the inlet and outlet pipes I5 and IS Ywhich slide in openings inthe upper wall of the shaft or-pasu sage 5. The pipes l5 and I6 are provided with flexible hose, one marked I 1 supplying the pipe l5 I6. It Will be understood that another hose like I'I is to be connected to the pipe I5. The damper I is inclined toward the stack flue. The upper edge of the frame I3 has attached thereto the rod I8 reciprocable through the upper wall of 20 the port and air passage 5. This rod is connected above the air passage 5 by the rope I9 to the drum on the shaft 2|. On the same shaft is the smaller drum 22 provided With the rope 23 which runs over the sheave 24 which is 25 attached to the stem 25 of the valve 8.

With the parts as shown on the drawing, air would pass down through the conduit, theV valve chamber 'I, the air passage 5 and the regenerator ue and thence on to the regenerator, not shown, the air contacting with the valve I as it enters the flue 3 whereby the valve is somewhat cooled and the air somewhat heated. From the regenerator the air having been heated thereby passes to a furnace, the Waste gases passing from the furnace through a second regenerator and regenerator flue into the stack flue 4 at the opposite end of that shown on the drawing. As the connection of reversing valves to a regenerative furnace is old and well-known and as this invention relates entirely to the valve construction and arrangement, the regenerators, the furnaceand the second set of valves like that shown have all been omitted. It will be readily l understood that there will be at the right of Fig. 4,5 1 a second set of valves like I and 8 arranged to be operated so that when the damper I isclosed and the air inlet valve 8 is open, the corresponding valves in the other valve unit will be in reverse position.

It will be noted that the damper frame I3 is provided with a cover plate 26 removably secured to the frame I3 by means of bolts 2l or equivalent devices. It will be seen that when the air which is fed under pressure passes from the passage 5 55 It will also be noted that the air closed. The ropespl'S and 23 are-wound in reverse directions on the drums 20 and 22Yso that when the shaft 2| is rotated to move the valves l. and 8 they are always moved so that one is open andY Y j the other is closed. 3 My hollow damper frame corresponds in shape and size to the damper seat ,and isrfmuchV better thanrit would berif the water cooling portionY were Va large chamber having V substantially the area 'of the valve. l,With my frameV provided with a circulating uid the rapid movement of the water therein prevents the settling of any sediment. With a damper with a large water-cooled chamber having the same farea as the damper, the Vcirculation of water is much slower: so'Y that sediment will gradually gather and cut-off the-circulation of water from Y at least a large portion of the damper. Thus,y the frame 'of jmyy damper willY be preserved much longer than it 4would be if the water circulated Y Y Y through a hollow substantially the size of the Y damper.,A Should the plate 26 be burned-out it is but a small matter to supply anotherin its place. Y

Y 1;Y In a damper construction adapted to be sub'-V jected to intense heat, a damper comprising a hollow framev `member providing apassageway for a cooling medium to preserver the same'from the destructive effect of heat, said frame member 'having anV opening therethrough, and an inde'- '21 Y f Y f 2,048,696

pendent continuous thin metal cover plate com-` pletely covering said opening, Y separate fromY but mechanically attached at itsY edges to said frame member, whereby warping or expansion strains in the' plate due to heat Ywill not causefdistortion of said cooled frame.

2. In a damper construction adapted to besubjected to Yintense heat, a damper comprising a hollow frame member providing a passageway for aY coolingpmedium to Vpreserve the'same from the'destructive eiect of heat, said Vframelmember Ulf having an opening therethrough,y and an inde- Y pendent continuous thin metal cover plate corn-v pletely covering said opening, separate Vfrom but "removablyrattached at its edges to said frame member, whereby warping or expansionstrains in the plate due to heat will not cause distortion of said cooled frame,V n Y 3. In a damper construction for a regenerative furnace provided with a -reg'eneratorv ilue and a stack flue, a vertical'air passage separating said ilues, a damper seat with Yan opening registering'i Y with the stack ilue,'a damper adaptedrto rest against said seat or Yto belifted in said air passage;Y and a main airV inle'tjfor supplying ff air "to the furnace, said-,inlet opening into Ysaid'airpassage at a Vpointremoved from'V saidk damper "Whenf Y raisedbut in a position to Vconstitute means for directing the Yairflowfagainstrthe side ofthe-V damper away from its`seat to aids'ubstantially in holding Ythe damper on itsseat.V Y e

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