US1172272A - Valve. - Google Patents

Description

F .1 v 19/ I;

J. W. GAMBLE.

v VALVE.

APPLICATION FILED NOV-4,1913.

Patented Feb. 22,1916.

WITNESSES unrrnn s'iraans rearnn'r ornrcn.

JOSEPH WJ GAMBLE,'OF PHILADELPHIA, PENNSYLVANIA, ASSIG-NOR T0 HARRISON SAFETY BOILER WORKS, OF PHILADELPHIA, PENNSYLVANIA, A COPARTNEBST-IIP.

VALVE.

Specification of Letters Patent.

i atented Feb. 22, 1916.

Application filed. November 4, 1913. i Serial No. 799,081.

To all whom it may concern:

Be it known that I, JOSEPH WV. GAMBLE, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Valves, of which the following is a specification.

This invention relates to valves and is directed particularly to the provision of a check-valve adapted to operate on low pressures, such for instance, as pressures under one pound. Check-valves of this character are of special utility in connection with installations of turbines of the bleeder type.

The invention involves the provision of a valve having one or more movable valvemembers, each of which is provided with a spring arranged to lift the valve-member from its seat, but having insufficient tension to effect such lifting of the valve-member when unaided by pressure upon the valvemember. Such a spring acting upon the movable valve-member serves to sustain a portion of the weight of the valve-member so that the pressure upon-the valve-member is required to lift av portion only of the valve-member in order to open a passage for the escape of the steam.

In the preferred embodiment of the invention, a plurality of movable members are employed governing individual openings through which excessive pressure conditions are relieved. Each of these valve-members normally rests by gravity upon the valvedeck in which the openings are formed in order to close those openings and a rise of pressure, tends to lift the valve-members from their seats. The springs above mentioned are arranged to assist in this raising movement. Thus if one or two of the valvemembers become stuck to their seats there will still be one or more others which will respond to the excessive pressure and operate to relieve it. Also, the provision of springs arranged to sustain a portion of the weight of the movable valve-members makes it possible to have the valve respond to a rise of pressure of a very small amount, such for instance, as a rise to six or eight ounces. Preferably a pressure plate is mounted stationarily within the casing of the valve on which all of the several springs employed bear at their lower ends, the upper'ends of these springs being connected to the stems of the valve-members. Also, each valvemember is preferably provided with a dash pot to regulate its movements.

The preferred embodiment of the invention is shown in the accompanying drawings, in which Figure 1 is a central vertical section of a valve and Fig. 2 is a horizontal section showing the pressure plate and the parts associated therewith in plan view.

Referring to these drawings, 3 indicates the casing of the valve having an inlet opening 4 and an outlet opening 5 formed therein. This valve is arranged to be horizontally disposed in a length of steam piping. Within the casing 3 is a horizon tally disposed valve-deck 6 having a plurality of openings therethrough, each of which is adapted to be closed by a movable valvemember 7. The casing 3 of the valve has walls 8 and 9 formed integral therewith with which the valve-deck 6 coacts so that the valve-members 7 control the passage of steam through the valve. The valve-deck 6 is secured in position in coaction with the walls 8 and 9 by a bolt 10 extending through a spacer 11.

A pressure plate 12 is mounted above and parallel to the valve-deck 6. It is secured stationarily in position by a bolt 13 passing through the pressure plate and entering the valve-deck, a spacer 14 being employed for separating the valve-deck and pressure plate the requisite amount. In addition to the bolts 10 and 13 and the spacers coacting therewith, additional bolts and spacers may be employed, as indicated, for holding the valve-deck 6 rigidly upon its seat upon the walls 8 and 9 and for mounting the pressure plate 12 fixedly within the casing parallel to and at a definite distance from the valvedeck 6.

Each of the movable valve-members 7 is provided with a stem 15 extending upwardly from the valve-member through an opening in the pressure plate 12. A spring 16 is coiled about each valvestem 15 above the pressure plate 12 and has its lower end lying within a cup formed in the upper face of the pressure plate and resting upon the pressure plate. The upper end of each spring 16 is received within a cap 17 secured upon the valve-stem 15. Each movable valvemember 7 is also provided with a dashpot. On the under side of the valve-member 1s a cylindri 'al extension 18 constituting a piston which is received within a cylinder 19 sustained by a holder 20 formed in the caste ing for the deck-plate 6.

Each of the springs 16 is compressed slightly between the deck-plate 12 and the cap 17 which is secured to the stem 15. Because of this compression, the spring 16 tends to lift the corresponding valveqnenr her 7 from its seat upon the deck-plate. Since the valve is disposed horizontally, the valve-member 7 tends to move by gravity downwardly 'pon its seat. The degree of compression of the spring 16 between plate 12 and cap 17 is such that the spring alone will not effect lifting of the valve-member 7. The spring is capable of sustaining but a portion of the weight of the movable valve-member 7. Therefore the valve-member 7 rests normally upon its seat, but it will be raised from its seat to open a passage through the valve in response to a pressure upon the under side of the valve-member less than the pressure which would be necessary to raise the valve-member were the springs 16 not employed. The spring 16 is so made that its lifting power is relatively small and its tension can be adjusted in order to secure the desired results by changing the position of the cap 17 upon the threaded end of the stem 15. In this way, the valve is made to operate as a check valve in response to increases of pressure which are comparatively low, such for in stance, as increases to six or eight ounces.v Valves arranged to operate in this manner are of particular utility in connection with bleeder turbines for regulating the flow of steam in the turbines.

Having described my invention, what I claim as new therein and desire to secure by Letters Patent of the United States is: V

1. A multi-port valve comprising a casing, horizontally disposed valve-deck mounted therein having a plurality of openings therein, a fixed pressure plate mounted above and parallel to the deck, a plurality of movable valve-members each adapted to rest by gravity upon the valve-deck in position to close one of the openings therein, a plurality of springs mounted above the pressure plate and bearing thereon, and a connection from each spring to a movable valve-member, each of said springs acting through its said connection in a direction to lift the corresponding valve-member from its seat, substantially as set forth.

2. A multi-port valve comprising a casing, a horizontally disposed valve-deck mounted therein having a plurality of openings therein, a fixed horizontal pressure plate mounted above and parallel to the deck, a plurality of movable valve-members each adapted to rest by gravity upon the valvedeck in position to close one of the openings therein, a stem on each valve-member projecting upwardly therefrom through an opening in the fixed pressure plate, a plurality of springs each coiled about a stem, connected at its upper end to the stem and hearing at its lower end upon the pressure plate, each spring being under compression to lift the corresponding valve-member from its seat but under insufficient compression to effect such lifting when unaided, and'a dash-pot connected to each valvemember, below the valvedeck, substantially as set forth.

A, inulti-port valve comprising a casting, a horizontally disposed valve-deck mounted therein having a plurality of openings therein, a pressure plate mounted above the deck, a plurality of movable valve-members each adapted to rest by gravity upon the valve-deck in position to close one of the openings therein, a stem on eachvalve-member projecting upwardly therefrom-through an opening in the pressure plate, the pressure plate having cylindrical flanges thereon one surrounding each opening, to form cups, and each valve stem having a cap secured to its upper end, and a plurality of springs each coiled about a-st-em, and positioned between thc'cap thereof and the adjacent cup formed on the pressure plate, said springs being under compression to lift their valve-members from their seats,

but under insufficient compression to effect such lifting when unaided, substantially as set forth.

This specification signed and witnessed this 31st day of Octobe1g1913. i JOSEPH VJJGAMBLEJ Witnesses:

Ronnn'r G. CLIFTON, i M. M. FULTON, J

Copies of this patent may be obtained for five cents each, by addressing the Commissioner 'of Patents,

Washington, D. C.

It is hereby certified that in Letters Patent No. 1,172,272, granted February 22, 1916, upon the application of Joseph W. Gamble, of Philadelphia, Pennsylvania,

for an improvement in Valves, an error appears in the printed specification requiring correction as follows: Page 3, lines 7 9-80, claim 3, for the WOI( casting read casing; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 14th day of March, A. D., 1916.

[SEAL] J. T. NEWTON, 01 Acting Commissioner of Patehts.

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