US2076306A - Means for adjusting throttle valves - Google Patents

Description

April 6, 1937- s. s. WEEKS 2,076,306

MEANS FOR ADJUSTING THROTTLE VALVES Filed DeC. 25, 1935 l SHIRLEY S. WEEKS INVE/V'R.

ATTORNEY:

Patented Apr. 6, 1937 6 Claims.

This invention relates to improvements in means for adjusting throttle valves.

Throttle valves, or the like, when employed to control liquid or gaseous fuel fed to a burner, are usually actuated automatically in response to changes in the steam pressure where the burner is used to produce such pressure in a boiler. The fuel is customarily supplied at a substantially constant pressure, whichof course is available at the supply side of the throttling valve. When this valve is open relatively wide, the differential of pressure between its supply and delivery sides is not so great as when the valve is more nearly closed. Accordingly, it is highly desirable that in the adjustment of the valve its travel when near its most closed or minimum opening position be `comparatively less or slower than when it approaches its maximum opening position. It is also desirable to provide means which enable the 20 minimum and maximum positions of the valve to be adjusted independently of each other, to provide for variation in the travel of the valve between these two positions and to provide for a separate adjustment of the valve with respect to 25 its seat, regardless of the other adjustments.

The provision of means for adjusting a throttle valve as aforesaid is the principal object of this invention.

The best mode in which I have contemplated 30 applying the principles of my invention is shown in the accompanying drawing but these are to be taken as merely illustrative and it is intended that the patent shall cover by suitable expression in the appended claims whatever features of patent- 35 able novelty exist in the invention disclosed.

In the accompanying drawing:

Figure 1 is an elevation, partly in section on line l-I of Figure 3, of means embodying my invention;

Figure 2 is a side elevation, away, showing a portion of the means ing the throttle valve;

Figure 3 is an end View taken from the right of Figure 2;

Figures 4, 5 and 6 are graphs, illustrating how the position of the valve may be varied by the novel adjusting means of my invention; and

Figure 'I is a view of a detail.

Referring more particularly to the drawing, the 5o throttle valve is shown as having a cone head I on a stem 2 which is movable toward and from a seat 3 in the interior of a casing 4. This is, of

course, merely indicative of any suitable form of control or throttle valve. An extended externally 55 threaded cylinder 5 is secured to the casing by a with a` part broken for actuatnut 6 and on this cylind which is fixed in position left or valve end o threaded therein for the valve stem and this guide an expansion spring IIJ em and pressing against a pin through. The right or frame through a suitable is held in place by ral opening for access also serves as a coiled about the st II extending there end of the valve stem passes packing or stuffing I2 which the cap nut I3 having a cent to the stem.

A cone seat engaged by the I4. The latter bifurcated end and be pivotally This lever has a tion through which another pin to pivotally connect the These arms are also frame 1.

series of holes 1' so corresponding holes saddle for UNITED STATES PATENT OFFICE MEANS FOR ADJUSTING THROTTLE VALVES Shirley S. Weeks, Providence, R. I.

Application December 23, 1935, Serial No. 55,829

er is mounted a frame 1 by a lock nut 8. At the f the cylinder a guide 9 is 2a in the end of the valve stem is conical point of an adjusting nut screws o I5a adapted to lever may be adjusted as desired.

The lever I6 mounted on a pin ings 2|, 22 also rides on a small connected thereto by a series of holes I6 in its lower por- I8 may be passed lever to arms nto a split rod I5 having a receive a lever I6 pin I1.

'la 0f the provided with a that by a proper selection of the iulcrum or pivot of the ball bearing I9 between two larger ball bearmounted on the same pin. The

the bifurcated end of a clevis o a rod 24 that extends through a hollow guide 25 pivotally engaged at its rotated by control apparatus (not steam pressure is a cam 21 whi another clevis latter clevis and the a coiled spring in a boiler. ch engages a ro 29 on the rod 24. lower end of 30 which ten the roller against the cam.

The larger ball bearings 2 I, 22 on the Figure 7) having slots on a plate 3| (see upper end with a shaft 26. This shaft may be shown) which, the changes of Between this the guide 25 is ds constantly to keep pin 20 ride 3 I a which enable the plate to be positioned on pin ends of two adjusting screws 32, 33 arately adjustable and may be locked in position by the nuts it be assumed 34, 35 respectively. The adjustments will now which are sepbe described. Let that the positions of the parts as gure l represent the mini This opening may be adof the screw 32. Let the the ball bearings I9, 2|, the e head I represent the maximum valve opening. This opening may be adjusted by movement of the screw to Figure 4 let the p the minimum valve opening when 33. Referring oint a on the chart represent the screw 32 is positioned as shown in Figure 1 and let the point b on the chart represent the maximum valve opening when the screw 33 is in the position shown in Figure 1. If the latter is turned further in- 5 ward, the maximum valve opening may be changed so that it may be represented by point bl as seen in Figure 5, the point a remaining unchanged. Or if the maximum valve opening, as indicated by point b is as desired, the minimum valve opening may be changed to a greater amount by movement of screw 32 so as to be indicated by point al of Figure 6. Thus it is clear that either the minimum or maximum positions of the valve opening may be adjusted independently of the other by separate settings of the screws 32 and 33 respectively.

As the shaft 26 and cam 21 are rotated (by control means not shown) the roller bearings are moved along the plate 3l. The lever I5 swings accordingly, as it remains in smaller bearing, and. controls the intermediate positions of the valve between its minimum and maximum openings. To vary the movements of thevalve between' these positions, the fulcrum pin 2.5 lmay be shifted from one hole IB) to another in the lever I6, a-nd to corresponding holes (1") in thev arms '1a. The corresponding variations in the intermediatepositions of the valve are indicated by the four curved lines c drawn on Figures 30 4, 5 and 6 between the points a (al) and b (bl) representing the minimum and maximum valve openings. Thus by adjusting the pin I8, variations in the intermediate travel of the valve between its minimum and maximum positions `may 35 be attained.

If it is desired to change the valve position without changing either the position of screw 32 or screw 33 or the pin I8, then nut M may be turned on the pin l5. Suppose, for example,

40 that the minimum opening is at point tion Figure 6, and the maximum at point b on the same figure. The intermediate travel is represented by the four lines c. VIf it is desired to reduce the valve opening in all' of its positions, this may be 45 accomplished by turning nut M' clockwise (as seen from the right). on- Figure 6 by the point four lines cl.

'I'hus the positions of the valve for either mini- 50 mum or maximumopenings may be independent- The result is indicated a., the point b and the mum and maximum positions may be independently adjusted without ailecting these positions, 55 and the valve opening for all positions may be independently adjusted without affecting the other adjustments.

The feature of my invention which provides r the slower opening of the valve when near 60 its minimum position is accomplished by virtue of the lever ISv and its relation to the points of adjustment for the minimum and maximum valve openings. When the ball bearings are in or near the position shown in full `lines in Fig- 65 ure 1, the point of engagement between the small bearing t9 and the lever I 6 is relatively remote from the fulcrum pin I8. As the rollers move toward the adjusting screw 33, .the point Aof engagement between the lever and the small bear- 70 ing becomes closer and closer to the fulcrum pin. Thus it follows that the same movement of the rollers when near the minimum adjusting screw 32 will produce a slower or less opening movevalve than will be produced by the 75 same movement of the rollers when the latter Contact with they are near the maximum adjusting screw 33. This variation in the travel of the valve is indicated by the lines c (and cl), it being evident that as the valve travels from the minimum opening a (or al) toward the maximum opening b` (or bl) it opens less rapidly near the minimum and more rapidly as it approaches the maximum. This feature has proven of great advantage in the adjustment of the valve to insure the proper proportioning of the fuel to the air supply for the burner.

I claim:

l. Means for adjusting a throttle valve or the like comprising, in combination, a valve stem; a leverl whose movements control the movements of said stem; an adjustable plate; means interposed between the lever and plate and movable therealong to vary the position of said lever in accordance with the position of said plate; adjustable means for positioning one end of said plate tol effect a minimum valveA opening; and other adjustable means for positioning the other end of the plate to eifect a maximum valve opening.

2. Means for adjusting a throttle valve or the like comprising, in combination, a valve stem; a lever whose movements control the movements of said stem; an adjustable plate; means interposed between the lever and plate and movable therealong to vary the position of said lever in accordance with the position of said plate; adjustable means for positioning one end of said plate to effect a minimum valve opening; other adjustableV means for positioning the other end of the plate to effect a maximum valve opening; and means for changing the fulcrum of said lever to vary its movements between its positions corresponding to minimum and maximum valve openings.

3. Means for adjusting a throttle valve comprising, in combination, a support attached to said valve casing; a frame carried by said support; a valve stem extending through said support; a lever fulcrumed on said frame in position to engage said valve stem whereby the movements of the lever control the movements of the valve; separated adjusting means mounted on said frame; a plate carried at one end by one of said adjusting means and carried at its other end by the other of said adjusting means; means interposed between said plate and lever and movable therealong whereby the swing of said lever is determined by the position of said plate; the adjusting means at one end of the plate determining the minimum valve opening and the adjusting means at the other end of the plate determining the maximum valve opening.

4. Means for adjusting a throttle valve comprising, in combination, a support attached to said valve casing; a frame carried by said support; a valve stem extending through said supa lever fulcrumed on said frame in position to engage said valve stem whereby the movements of the lever control the movements of the valve; separated adjusting means mounted on said frame; a plate carried at one end by one of said adjusting means and carried at its other end by the other of said adjusting means; means interposed between said plate and lever and movable therealong whereby the swing of said lever is determined by the position of said plate; the adjusting means at one end of the plate determining the minimum valve opening and the adjusting means at the other end of the plate determining the maximum valve opening; there being a series of holes in said lever and in said frame whereby the fulcrum of the lever may be altered to vary the swing of the lever and corresponding movement of the valve between its positions of minimum and maximum opening.

5. Means for adjusting a throttle valve or the like comprising, in combination, a valve stem; a lever whosemovements control the movements of said stem; an adjustable member; means interposed between the lever and said member and movable therealong to vary the position of said lever in accordance with the position of said member; adjustable means for positioning one end of said member to effect a minimum valve opening; and other adjustable means for positioning the other end of said member to effect a maximum valve opening; the said lever being fulcrumed so that equal movements of said in- 20 terposed movable means will effect a lesser movement of the valve when near its position of minimum opening than when near its position of maximum opening.

6. Means for adjusting a throttle valve or the like comprising, in combination, a valve stem; a lever fulcrumed near one end and having intermediate of its ends an operative connection with the valve stem whereby movements of the lever control the movements of said stem; means movable along said lever toward and from its iulcrum; a member arranged to be engaged by said movable means throughout the movement thereof; adjustable means for positioning the end of said member remote from the levers' fulcrum to eiect a minimum valve openingj' and other adjustable means for positioning the end of said member which is nearer said fulcrurn to effect a maximum valve opening.

SHIRLEY s. WEnirs.

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