US1567612A - Steam valve - Google Patents

Description

Patented Dec. 29, 1925.

UNITED STATES v 1,567,612 PATENT OFFICE.

PASQUALE PASCALE, OF NEW YORK, N. Y., ASS IGNOR TO BESTUOCI STEAM VALVE CORPORATION, 01E MANHATTAN, NEW YORK, A CORPORATION OF DELAWARE.

STEAM VALVE.

Application filed March 22, 1922- Serial No. 545,638.

To all whom it may concern:

Be it known that I, PASQUALE PASCALE, a subject of the King of Italy, residing at 152 East 116th Street, New York, New York, have invented new and useful Improvements in Steam Va lves,flof which the following is a specification.

My invention relates to a combined valve and drying device for use in connection with steam boilers, particularly of the marine and locomotive types. The principal objects of my invention are to provide a drying device in conjunction with the throttle valve; to associate therewith and make a part thereof a positive stop valve; to provide a bypass for the drying apparatus; to insure that the valve is balanced under all conditions of operations; to include a check valve in the arrangement, and to provide for a single control for the operation of these parts.

Having these objects in view and such others as appear from the following descr1ption, my invention consists in the constructions, combinations and arrangements herein described and claimed, and illustrated in the accompanyng drawings.

In these drawings, in which I have illustrated preferred embodiments of my invention, and in which similar reference characters designate corresponding parts in all views,

Figure 1 is a longitudinal section through a valve embodying the invention in a form suitable for marine use; 7

Figure 2 is a partial section taken. ap: proximately on the line 2--2 of Figure 1;

Figure 3 is a section through the valve member 5 approximately on the line 3-3 of Figure 1; and

Figure 4 is a longitudinal section through a valve of a type suitable for locomotive use.

Referring to these drawings, and particularly to Figure 1, I provide a valve casing 1 having a steam space 2 which the steam enters through the inlet 3, the casing having an outlet 4'. Within this casing is a valve member 5 preferably of cylindrical construction adapted to be moved longitudinally by a hand wheel 6 mounted upon a threaded bushing 7 carried on a bracket 8 fixed to the casing l, the threaded bushing 7 cooperating with a threaded shaft 9 suitably connected with the valve 5. Y

The valve member 5 is designed to act also as a dryer for the steam, and to this end may be provided with a plurality of perforations 10. A portion of the casing 11 is arranged to coact with the valve member as a valve seat to prevent the How of steam when the valve is closed, or moved toward the left as shown in Figure 1, controllin the number of perforations exposed an thus the amount of steam flowing as the valve is opened by moving it to the right.

As a slide valve of this type may not be absolutely steam tight, I combine with this throttling valve and dryer a stop valve 12 preferably formed internally of the cylindrical valve member 5 as a part thereof, and arranged to close on a valve seat 13 mounted on the portion 11 of the casing, so that when the valve member 5 is moved to the left or closing position the stop valve 12 is caused to close upon the valve seat 13 and effectively prevent leaking of any steam from the interior of the casing to the outlet 4.

The perforations 10 are preferably so many in number that when all are exposed by sliding the valve member 5 to the right their combined area is sufficient to permit the flow of steam at the full capacity of the outlet 4. In order however that there may be no interference with the flow by reason of stoppage of any of the perforations so as to render the device wholly or partially inoperative, I have provided means to permit of the steam being by-passed around the perforations. This I accomplish by mounting the valve member 5 in a suitable bushing or guide member 14: within which the valve member is slidable. A steam tight connection between the valve member 5 and the guide 14 may be maintained by means such as a piston or packing ring 15. In addition the valve seat member 13 may be provided with several lugs 16 extending beyond the face thereof. When the. valve member is moved to the extreme limit of its travel to the right to the position shown in dot and dash lines, the edge 17 of the valve member 5 passes beyond the surface of the valve seat 13, a distance h, being guided by the lugs 16 thus forming a direct passage from the interior chamber 2 of the valve casing 1 to the outlet 4.

It is frequently desirable that the valve be balanced. For this purpose passages 18 may be provided in the dividing wall 19 of the valve member '5, this wall 19 being for the purpose of connecting the valve member 5 with the shaft 9 as shown in Figures 1 and 3. The shaft 9 has a groove 20 turned near the end, so as to form a flanged head 21. The wall 19 has a slot 22 for the reception of the head 21, the slot having an inward flange 23 at the central part to engage the groove 20 and retain the head 21, the slot at the upper part having an opening 24 large enough for the insertion of the head 21. This form of fastening between the shaft 9 and valve member 5 is preferred, but not essential.

Since steam is admitted to the interior of the valve through the passages 18, the shaft 9 is preferably provided with stuffing boxes 25, 26.

It is convenient to provide means for indicating the position of the valve member within the casing, such as the arrow 27 carried by the shaft 9 and arranged to cooperate with the scale shown upon the bracket 8, the numbers 1 to 10 inclusive 1ndicating the relative number of perforations of the valve exposed, the designation 0 the closed position of the valve in which the stop valve is also closed, and the number 11 the extreme open position of the valve at which the steam is by-passed around the perforations.

When a valve of this type is used 1mmediately on top of a boiler, and several boilers are arranged to feed the same steam main, it is usually desirable to provide a check valve 28 between the valve 1 and the boiler so as to prevent flow or leakage of steam back into an idle boiler.

In Figure 4 I have shown a type of valve adapted for locomotive use. As the valve is located in the steam dome 100 shown in dot and dash lines, no external casing is necessary. The valve member 105 is provided with perforations 110 on the cylin .drical surfaces, and also on the top if desired, the valve being arranged to open vertically, exposing additional perforations 110 above the seat portion 111 of the casing 101. Included within the valve member 105 is a stop valve 112 adapted to close on the valve seat 113 to close the passage from the steam dome to the valve outlet 104.

The valve is of special balanced construction, being formed of two parts, 105 and 150, the part 150 being a hollow piston arranged to slide vertically in a guiding cylinder 114, maintained steam tight by a. packing ring 115. The valve is operated by means of a stem 109 passing vertically through both of the members 105 and 150, and connected at its upper end with suitable levers and links to enable the valve to be controlled by the throttle lever in the locomotive cab. The lower end of the valve stem 109 carries a pin unlikely occurrence) 151 or other means whereby the balancing valve member 150 is raised by lifting the valve stem. A sliding connection 152 is provided between the valve members 105 and 150 so that initial movement of the stem and valve member 150 does not affect the main valve member 105. The valve member 105 is provided with a valve seat 153, and a valve surface 154 is provided on the stem 109, so that on initial movement of the stem and balancing member 150, steam is ad-- mitted to the interior of the valve and cylinder 114, balancing the steam pressure on the outside of the valve. The vanes 155 constitute additional means for drying the steam on its passage through the valve.

The operation of the device, while indicated in the foregoing description, may be summarized briefly. \Vhen the valve is in closed position, passage of the steam therethrough is positively prevented by the stop valve 12, 112; on opening the valve, the sto valve no longer interferes with or contro the passage of steam, but this is controlled by the number of perforations 10, 110 exposed, these perforations serving to both separate the water from the steam, and further dry the steam by the throttling effect as it passes through. As explained, the valves are at all times balanced. In order to prevent any possibility of interference with the working of the valve due to perforations becoming clogged, (an extremely uiding means have been provided to permit opening the valve beyond the normal seat so as to by pass the steam around the perforations and give a free passage to. it just as if the drying device were not in use.

Having now described my invention, 1 claim and desire to secure by Letters Patent,

1. In a steam valve the combination comprising a casing, a longitudinally movable sleeve valve having means, comprising a plurality of perforations therethrough, for drying the steam, a coacting portion of said casing with which said sleeve valve is in sliding contact, means to move said sleeve valve relatively to said coacting portion so as to control the number of perforations which are open for the pass-a e of steam, a stop valve associated with said sleeve valve to positively cut off the supply of steam, and means for bypassing the steam around said perforations while maintaining said sleeve valve in sliding engagement with said coacting portion on said casing.

2. In a steam valve the combination comprising a casing, a longitudinally movable sleeve valve having means, comprising a lurality of perforations therethrough, for drying the steam, a coacting portion of said casing with which said sleeve valve is in sliding contact, means to move said sleeve valve relatively to said eoacting portion so as to sleeve valve whereby the end of such valve to control the number of perforations which may b moved clear of the end of said coare open for the passage of steam, a stop acting rtion and a free passage thus provalve associated with said sleeve valve to vided fggthe steam in bypassing it around positively out off the supply of steam, a said perforations.

plurality of guide members spaced apart on In testimony whereof I have signed my 15 said coacting member and projecting bename to this specification.

0nd the en thereof, such guide members ing adapted to form a guide for said PASQUALE PASCALE.

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