US1960844A - Control device for liquid fuel burners - Google Patents

Description

ay 29, A. J. GILBERT ,8 4

CONTROL DEVICE FOR. LIQUID FUEL BURNERS iled Dec. 21 19:51

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Patented May 29, 1934 CONTROL DEVICE FOR LIQUID FUEL BURNERS Alfred J. Gilbert, Windsor, mm,

assignor to The Silent Glow Oil Burner Corporation, Hartford, Conn., a corporation of Connecticut Application December 21, 1931, Serial No. 582,427

2 Claims.

This invention relates to control valves intended more particularly, though not exclusively, for the control of a liquid fuel supply to burner or other fuel consumption device.

a The invention has, among other objects, the

provision-of avalve structure of relatively inexpensive form consisting of a reduced number of parts and provided with a device of simplied form for positively limiting the opening movement of the valve.

In the illustrated form of the invention, a valve in duplex form is shown adapted to supply liquid fuel from a common supply source'to a pair of duplex or twin burners, so that the supply of liquid fuel to each burner may be controlled independently of or coordinately with thesupply to the other, but having such relationship that the fuel supply conditions as to either or both burners may be readily ascertained.

m The invention will be best understood by reference to the following description when taken in connection with theaccompanying illustration of one specific embodiment thereof, while its scope will be more particularly pointed out in the appended claims.

In the drawing:- Fig. 1 is a central, longitudinal section taken through the valve structure, showing the latter a on a somewhat larger than actual scale;

3Q Fig. 2 is a vertical, cross-sectional elevation on the line 2-2 in Fig. 1;

Fig. 3 is a plan view of the valve structure on a somewhat smaller scale, showing the covering shield; and

Fig. 4 is an enlarged sectional detail illustrating one of the valves in its full open stopped position.

Referring to the drawing and to the embodiment of the invention here shown for illustrative purposes, and more particularly to Figs. 1 and 2,

the valve comprises an elongated valve casing 11 having an interior supply chamber 13 interme diate, and herein substantially midway between, its opposite ends, to which chamber liquid fuel is supplied through the pipe connection 15 threaded into the bottom of the casing and connected by a pipe or conduit to any suitable source of fuel supply. For descriptive purposes, liquid fuel is herein referred to as oil. At each opposite end of the supp y chamber 13, the casing has formed therein a port of circular cross-section, the two ports being in axial alignment and cooperatively related each to a control valve, which valves are also axially aligned but oppositely disposed. ,One valve only need be described, as they are similar in construction,

a liquid fuel except in respect to the features hereinafter referred to.

Each valve comprises a stem 1'7 having threaded engagement with the bore of the casing so as to be capable, when turned, of being advanced or so retracted with relation to its port. The stem terminates in a valve seating member 19 having a tapered seating surface adapted to seat against correspondingly shaped walls at the end .of the port 21, so that as the valve stem is turned in one direction the port may be opened by the withdrawal of the seating member therefrom, and

when turned in the other direction is closed by the seating of the valve. The pitch of the threads on the stem may be such, if desired, that one 70 .turn or a partial turn of the stem will move the valve from a closed position to a position in which the port is sufficiently opened to provide the required fuel supply of oil for the burner, or a thread pitch may be selected requiring a greater 7t range of turning movement than is provided by a single turn.

The seating member 19' is connected to the threaded portion of the valve stem by a portion 23 of reduced cross section, and around the same so there is provided within the casing an enlarged annular oil delivery space. The shoulder formed between the seating member 19 and the connecting portion 23 constitutes a stopwall, and within its path inthe oil delivery space and a short distance as back of the shoulder there is provided an abute ment or stop member 25 fixedly secured to the casing and adapted to positively limit the opening movement of the valve. The abutment 25 is carried by a stud 2'7 which is threaded into the valve casing and also serves an additional function hereinafter referred to. The abutment 25 provides a very simple and inexpensive form of stop adapted to limit the opening movement of the valve, and further to prevent the valve stem from being withas drawn from the casing in the course of ordinary usage. Such movement can obviously be limited to any desired range by altering the proportions of the abutment and the seating head so that the rotative movement of the valve stem may be hm- 10o ited to any desired number of turns of the stem or any fraction of a single turn, as-may be desired.

The valve stems protrude through opposite endsof the casing, suitable packing 29 being provided and held in place by the gland 31 and nut 33, the latter threaded on the end of the casing.

To the protruding end of each valve stem is secured a valve actuating member, herein in the form a radial arm 35, clamped to a shouldered portion 37 of the stem by a nut 39. The shouldered portion of the stem and the engaging part of the arm are provided with small, interfitting notches or teeth which hold the arm fixedly on the stem but permit it to be removed and readjusted to different angular positions to compensate for wear, or for any other reasons requiring a resetting of the arm. Each actuating arm extends radially upward and terminates in a lateral extension 41 forming an index member in the shape of a finger or pointer which extends inwardly and over but in close relation to a scale or series of graduations (Fig. 3) representing the degree of port opening or the rate at which oil is being supplied. These graduations are marked at each opposite end of a covering shield 43 which overlies the entire valve structure and is particylindrical in shape, the axis of the cylinder coinciding approximately with the axis of the valve, so that the graduated edges of the shield lie in approximate parallelism to the path of movement of the index member 41. The shield 43 is secured by screws 45 to the upright studs 27 which are threaded into the top of the valve casing and carry the interior valve-abutting stops 25 heretofore referred to.

To position the valve actuating arm in any assigned position of adjustment, opposite edges of the shield may be provided with a series of notches or serrations 47, arm has pressed or otherwise formed in it a somewhat rounded protrusion 49 (Fig. 1) adapted to engage the notches. The arm is preferably somewhat resilient and is clamped on the stem in such a position that it bears yieldably against the notched edge of the shield so that it may be held thereby in' any assigned position to which it is moved but may be readily turned and slipped from one notch to another. The index member 41 may be provided with a button 51, or other suitable means may be utilized, to conveniently manipulate each valve actuating arm.

It will be observed that one valve stem (herein the right-hand one in Fig. 1 and left-hand one in Fig. 3) is provided with right-hand threads, while the opposite valve stem has left-hand threads, so that in opening or closing the respective valves both index members move in the same direction, as viewed from the operators standpoint, that .is to say, from above in Fig. 3, one valve (right-hand one in Fig. 3) actually having a clockwise opening movement and the other a counterclockwise opening movement. The result is that the index members in the closed or open position, or in the same intermediate position, of both valves lie directly opposite each other in positions of exact alignment, pointing toward each other along substantially the same element of the cylindrical shield. Accordingly, a" mere casual or distant observation of the relative positions of the index fingers on the shield, and without the necessity of reference to the scale, will enable one to see at any time whether oil is being suppliedto both burners at the same rate or at differentrates, and if at different rates the relation between the two. Furthermore, due to the segmental form of the scalebearing end of the shield, which, to the view of the operator, spreads the graduations in a linear series, as contrasted with a circular series, the degree to which either valve is open may be readily ascertained from a. casual or distant observation, and without examination of the scale, by observing the general position of the index member along the segmental scale and its relation to the opposite ends thereof. Provision is preferably made so and the abutting face of eachv that the abutting stops 25 provide substantially the same range of opening movement for each valve and the index members of the two valves, when the latter are stopped at tion, lie opposite each other in ment. 4

By positioning the stop member 25 so that it engages the stop wall between the threaded portion of the valve stem and the seating member of the valve and in immediate contact with or proximity thereto, it provides a positive and accurate stop subject to substantially no variation, preventing withdrawal of the valve stem except through dismantling the structure, as well as providing a stop which canbe readily adjusted by altering the proportions of the abutment and the seating head, and one which can be removed to permit the withdrawal of the valve stem from the casing only substantial alignthe full open posiby removing the shield 43 and the threaded studs 27.

When the valves are opened, oil passes from the central supply chamber 13 through the ports into the annular delivery chambers surrounding the reduced portions 23 of the valve stems, passing thence into the pipe connections or nipples 53 which are threaded into the side of the valve casing to communicate with their respective delivery chambers, and thence to the delivery pipes for the burner or other fuel consumption unit.

The described structure has the advantage of being readily cleaned from sludge, dirt or other accumulations, the removal of the valve from the casing providing a straight-away opening through the ports and the supply and delivery chambers through which a cleaning member may be inserted. The valve stems may be readily removed by unscrewing the studs 27 and withdrawing the abutting stops 25. To further facilitate cleaning, the valve casing has an opening in the top of the supply chamber aligning with the supply connection or nipple 15, which opening is closedby the plug 55.

While I have herein shown and described for the purpose of illustration one specific embodiment of the invention, it is to be understood that extensive changes may be made in the details of construction and relative arrangement of parts, all without departing from the spirit of the invention.

I claim:

1. A controlling valve structure comprising an elongated valve casing having a supply chamber intermediate its ends and oppositely disposed delivery chambers communicating with said supply chamber-through oppositely disposed ports, axially aligned oppositely disposed valves operativ'ely related one tov each port and having each a stemin threaded engagement with the casing, said stems extending through opposite ends of the casing and having one a right-hand threaded engagement and the other a left-hand threaded engagement with the walls of t e casing, each valve having a valve seating member adapted to open and close its port through rotative movement of the stem, an external manually operable rotatable actuating member for each valve, oppositely arranged indicating devices for each valve comprising an indicating scale member secured to the casing and a cooperating index member carried by said actuating member, studs supporting said scale member on the casing, a stop wall provided by each valve between the valve seating member and the threaded portion of the stem, and a stop member carried by each stud and lying each within the path of one of the stem, an external indicating device support-- ed by the casing for indicating the position of the valve, a stop wall carried by the valve between the valve seating member and the threaded portion of the stem, and a support for said indicating device extending through the walls,

of the casing and presenting an interior stop member lying within the path of said stop wall to limit the opening movement of the valve. ALFRED J. GILBERT.

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