US1416391A

US1416391A - Valve

Info

Publication number: US1416391A
Application number: US398400A
Authority: US
Inventors: John Van Brunt
Original assignee: COMBUSTION ENG CORP
Current assignee: COMBUSTION ENG CORP; COMBUSTION ENGINEERING Corp
Priority date: 1920-07-23
Filing date: 1920-07-23
Publication date: 1922-05-16
Anticipated expiration: 1939-05-16

Description

J. VAN BRUNT.

VALVE.

APPLICATION FILED JULY23, 1920.

1,416,891, Patented M y16,1922.

FIG. 8

w k Q N INVENTOR. & r; Mi

| I I [[1 4 f JOHN VAN BRUNEI, 0F FLUS INEEBING CQRPORA'MON, OF NEW YO, N. Y.. A CORPORATION OF NEW YORK.

1 41 3911 Specification of Letters Patent. Pgm fmdi m 1 @922 Application filed. .l'uly 23,

To all whom it mag/concern Be it known that l, JOHN VAN BnUN'r, a citizen of the United States, residing at Flushing, county of Queens and State of New York, have invented a certain new and useful Improvement in Valves, of which the following is a full, clear, and exact descriotion.

li/ly invention relates to improvements 1n valves, being particularly adapted to a balanced or lifting type of throttle valve WlllCll is very well known in the trade and 1s frequently used in conjunction with steam pressure regulators of the hydraulic type in which a slight variation of steam pressure will cause a definite movement of the piston through hydraulic means. These valves are ordinarily actuated through levers having. fixed fulcrums, the levers being 1n turn actuated by hydraulic regulators controlled by variations in steam pressure. In the usual form of hydraulic regulator the piston has a maximum stroke or travel of about ten inches and for a fall in pressure of approximately one and one-half or two pounds Wlll travel the full ten inches and for fractional parts of such variation in pressure Wlll travel a corresponding fraction of its full stroke, moving the valve lever correspond ing amounts.

An objection is found to this type of valve in this class of work in that the size of the valve or port openings of the valve, as commercially manufactured, is usually not proportionedto the amount of steam requlred for the maximum flow and the valve 1s not properly adjustable. F or instance, 1f the valve is regulating an engine which is driving a forced draught fan, 1t Wlll be found that the usual valve will pass very much more steam in its maximum or intermediate openings than is necessary, so that frequently an engine or turbine will go from its minimum speed to the maximum speed with a movement of only one-quarter or onefifth, or even less, of the maximum possible travel of the valve. The result is that the fan engine will alternately be running at its maximum speed and at its mlmmum speed and at no time will the actual air supplied be proportioned to the demand for steam. a

The object of my invention is to do away with these objections and to provide a valve which can be adjusted through its actuating 1920. Serial No. 398,400.

lever so'that the maximum port opening for a full movement of the regulator piston will be just sufiicient to drive't-he engine or turblue at its maximum speed. On account of varying conditions. in different plants it is ve ry diflicult to proportion a valve to such requirements in advance and a valve in which the maximum port opening can be adjusted after installation to meet the conditions present has a very definite value.

\ The following is a description of an ernbodiment of my invention, reference being had to the accompanying drawings, in which, i

Fig. 1 shows an embodiment of my inven tion in connection with a balanced throttle valve, the valve-casing being in section;

Fig. 2 shows an end elevation of the same partially in section on the line 2..?;;

F ig. 3 is an end elevation of the lever supporting and guiding member looking toward the right-hand end of Fig. 1;

Fig. 4 is a detail planview of the parts shown in Fig. 3 with the lever, valve-stem and fulcrum link omitted; and,

Fig. 5 is a detail showing thelever, fulcrum link, block and supporttherefor loolr in toward the left-hand end of Fig. 1.

eferring more particularly to the drawings, 1 is the valve-casing of a throttle valve having a balanced plunger 2 passing through valve-seats 3-3 therein and functioning in the manner well understood, these parts being a well known construction. 45 is the valve-stem connected to the valve 2 j and extending through the projection 5 on the cover 6 of the valve-casing. 7 is a support having an extension 8 in the form of .a hollow cylinder surrounding the projection 5 and secured in place by a nut 9 screwed thereon.

This support 7 is provided with a surface 10 and a series of holes 11, both of which are parallel to the axis of a lever 12 connected to the valve-stem at 13 and fulcrumed at 14 when the lever is in the osition corresponding to the- ClOSQCLPOSltlOIl of the valve 2. The surface 10 and series of holes 11 are preferably inclined as in Fig. 1. The fulcrum 14 is provided by a fulcrum link 15 carrying the fulcrum 14:, which is adapted to be introduced to any one of a series of holes surface, being held in any desired adjusted position by the bolt 19 passing through one of the series of perforations 11. The link 15 is preferably substantially parallel to the valve-stem 4; and can be adjusted toward or from that valve-stem by changing the positions of the bolts 14 and 19. The surface 10 being parallel to the axis of the lever 12 when the valve is in closed position, the link 15 can be adjusted toward and from the valve-stem a when the valve is closed withoutchanging the position of the lever 12. Two important results of this arrangement are that when the link 15 is adjusted nearer to the valve-stem l the valve will begin to open substantially as quickly as it would before adjustment, but on account of the shortening of the load-arm by such adjustment the full throw of the lever 12 will not open the valve 2 to as great an'extent as before adjustment. The lever 12 in its full movement preferably moves, from one side to the other of a horizontal plane passing through its fulcrum.

In a corresponding manner,when the link 15 is moved away from the valve-stem 4 the time of opening of the valve 2 will not be modified but the maximum opening of that valve for a full throw of the lever 12 will be increased. The valve therefore can be very easily adjusted after installation so as to vary the maximum port opening in either direction to the desired extent without affecting the time of the initial opening of the valve. In the position. shown, the valve is closed, the top of the valve ports 20 therein being in line with the top of the valve seats 3', the downward throw of the valve being limited by the stops 21, and any upward movement of the valve 2 from the position shown in Fig. 1 results in an immediate partial opening of the valve.

If the fulcrum 1a is moved to the left by using the left-hand holes of the series 16 and 11, the maximum lift of the valve for a full movement of the lever will be correspondingly increased and the steam passed will be proportional to the parts of the openings 20 which are above the valve seats. H with this adjustment those openings are too large for a given movement of the lever they may be reduced by moving the fulcrum in toward the valve-stem. llf the fulcrum be adjusted by using the innermost holes of the series 16 and 11 the maximum lift of the valve 2 for the maximum travel of the outer end of the lever will be reduced in proportion as the load arm is reduced. In this way it is possible to closely control the extent of opening of the valve for a given movement of the lever. The device may be applied to existin valves of the general type of balanced t rottle valve now in use. The powerarm of the lever is guided in a slot formed by the base 22 and plate 23 secured thereto. A semi-circular flange 24: is secured to the support 7 and cylinder 8 so as to afford a supneieeer porting base for those parts. From this ase there also rises an arm 25 carrying a guide 26 for the upper end of the valve-stem 4. 27 is an ordinary stufling box.

As will be evident to those skilled in the art, my invent-ion permits of various modifications without departing from the spirit thereof or the scope of the appended claims.

Whatl claim is:

1. The combinationof a valve-casing, a valve reciprocating therein and a valvestem extending through and guided for movement in a. straight line by the casing, with a lever pivotally connected to said valve-stem, the axes of the pivotal connection bein fixed relatively to said lever, a fulcrum for the lever, and means for adjusting said fulcrum toward and from said valve-stem along said lever when said valve is in closed position without changing the position of said lever.

2. The combination of avalve-casing, a balanced plunger valve reciprocating therein and a valve-stem extending throu h and guided for movement in a straightline by the casing, with a lever pivotally connected tosaid valve-stem the axis of the pivotal connection being fixed relatively to said lever, a fulcrum for the lever, a support for said fulcrum, and means for adjusting said fulcrum' upon said support toward and from said valve-stem along the axis of said lever when said valve is in closed position without changing the position of said lever.

3. The combination of a valve-casing, a. valve reciprocating therein and a valvestem extending through and guided for movement in a straight line by the casing, with a lever connected tosaid valve-stem, an adjustable fulcrum link for said lever, a fixed abutment for supporting the lower end of said link, and means for adjusting both ends of said link toward and from said valve-stem when said valve is in closed position, without changing the position of said lever.

a. The combination of a valve-casing, a valve reciprocating therein and a valve-stem projecting therefrom, with a lever connected to said valve-stem, an adjustable fulcrum link therefor, a block to which the lower end of said link is pivoted, a support for said block, and means for adjusting said! block along said support and the upper end of said link along said lever toward and from said valve-stem in substantially parallel lines when said valve is closed.

5, The combination of a valve-casing, a valve reciprocating therein and a valve-stem projecting therefrom, with a lever connect ed to said valve-stem, an adjustable fulcrum link therefor, a block to which the lower end of said link is pivoted, a support for said block, and means for adjusting said block along said support and'the upper end iae of said link along said-lever toward and from said valve-stem in-substantially parallel lines when said valve is closed, one of said parallel lines constituting the axis ofi said lever,

6. The combination of a valve-casing, a valve reciprocating therein and a valve-stem projecting therefrom, with a lever connected to said valve-stem, an adjustable fulcrum link for said lever, an abutment for sup-porting the lower end of said link, means for adjusting both ends of said link along lines substantlally parallel to the axis of said lever when said valve is in closed position without changing the position of said lever, said valve-casing having a projection surrounding said valve-stem and said abutment having an extension surrounding said projection, and a nut upon said projection securing said abutment to said valve-casing.

7 The combination of a valve and means for opening and closing the valve comprising a valve stem, a lever operatively connected with the valve stem between the ends of the lever, a fixed support, and a. link having one end pivoted on the support and its other end pivotally connected with the lever to serve as a fulcrum about which the lever is turned in operating the valve, said lever,

JOHN VAN BRUNT.