US736820A

US736820A - Pop safety-valve.

Info

Publication number: US736820A
Authority: US
Inventors: John Collis
Original assignee: WILLIAM P COLLIS
Current assignee: WILLIAM P COLLIS
Priority date: 1902-10-11
Filing date: 1902-10-11
Publication date: 1903-08-18
Anticipated expiration: 1920-08-18

Description

PATENTBD AUG. 18, 1903.

J. GOLLIS.

POP SAFETY VALVE.

APPLIouIoN FILED oc'1.11, 1902.

F0 IODEL ivo. 736,826.

UNITED STATESY I Patented lugu'st 10,190.

`PATI-rrr OFFICE.

-JOHN OOLLIS, OF DES MOINES, IOWA, ASSIGNOR TO WILLIAM P. OOLLIS, OF

NEW YORK, N. Y.

PP SAFETY-VALVE.

SPECIFICATION forming part of Letters Platent N o. 736,820, dated August 18, 1903. i pplication iiled October 11,1902. Serial No. 126,951. (No model.) i

.To a/ZZ whom it may concern:

Be it known that I, JOHN CoLLIs, a citizen of the United States, residing at Des Moines,

y in partially counterbalancing the pressure of the steam upon the safety-valve, the remainder of the pressure being counterbalanced by means of a spring, to the end that a comparatively small and inexpensive spring may be used on pop safety-valves of this class designed to open only upon the yapplication of a comparatively great steam-pressure on the safetyvalve. I-leretofore in valves of this class it has `been customary to counterbalance the internal boiler-pressure upon the valve wholly by means of a spring, thus necessitating the employment of a very heavy and expensive spring on boilers operated at a very high steam-pressure-such, for instance, as marine boilers.

A further object is to'provide a valve of this class which may be temporarily locked in its closed position, so that any of the operative parts of the valve-controllin g mechanism may be removed for repair or replacement without danger of opening the valve or without cutting o the steam-pressure upon the valve.

A further object is to provide a valve of this class in which the tension of the spring may be readily, quickly, and easily adjusted, so that the valve may open on `any predetermined amount of steam-pressure as applied on the interior of the boiler.

My invention consists in certain details in the construction, arrangement, and combination of the variouspartsof the device whereby the objects above contemplated are attained, as hereinafter more fully set forth, pointed out in my claims, and illustrated in the acaccompanying drawings, in which- Figure 1 shows a side elevation of a pop safety-valve with my improvements applied thereto, one side of the piston supporting loop being broken away. Fig. 2 shows a vortical central sectional View through the safety-valve proper. Fig@ 3 shows a vertical central sectional view through the counterbalancing-cylinder. central sectional view through the counterbalancing-spring. Fig. 5 shows a side eleval`tion of the device for locking the safety-valve in its closed position, and Fig. 6 shows a plan view of one of the guide-plates of the counterbalancing-spring.

Referring to the accompanying drawings, 1 have used the reference-numeral 10 to indicate a valve-casing of the kind usually employed in pop safety-valves. Said casing is `provided with a number of openings 11 near the upper end, through which the steam may pass when the valve is open.

The numeral 12 indicates the valve proper, seated within the casing and mounted on the valve-seat and so arranged that when the valve is in its closed position the passageway through the casing is closed and when the valve'is in its elevated position the passage-way is open. At the top of the valvecasing is an arm 14, to which `a lever 15 is fulcrumed. This lever passes through a slot in the top of valve-stem 13, and a roller 16 is provided in the valve-stem in the lower end of the slot, which roller is normally in` engagement with the lower edge of the lever 15. On the opposite end of arm 14 is a slotted guide-army?, through which the lever 15 also passes and which limits the upward movement of said lever. Formed on or iixed to the lower part of the valve-casing is a laterally-projecting arm 18, substantially parallel with lever 15. Obviously as the valve 12 is elevated the free end of the said lever 15 will also be raised.

I have provided means whereby the steampressure on the interior of the boiler to which the valve-casing 10 is attached may be utilized in partially counterbalancing the upward pressure upon the valve 12 as follows: The numeral 19 indicates a hanger connected with lever 15 by means of the bolt 2O and Fig.4 shows a vertical provided with a vertically-elongated opening IOO a vertically-arranged cylindrical chamber 24, to the top of which a screw-cap is attached, and a screw-plug 26, having a central opening, is placed in the bottom of said cylindrical opening. Beneath the cap 26 the said yoke 22 is provided with an opening 27, through which opening the lower end of hanger 19 is passed, as clearly shown in Fig.

3, so that the hanger 19 may move vertically to alimited degree through the said opening 27.

The numeral 28 indicates a piston-rod eX- tending vertically through the lower end of yoke 19 and adjustably held therein by the nuts 29 on the piston-rod above and below the yoke. The upper end of piston-rod 28 passes through the opening in the screw-plug 26, and a piston 30, `preferably of cup shape, is attached to the upper end of the pistonrod 28 in the cylindrical chamber 24.

The numeral 31 indicates a steam-pipe leading from the valve-chamber 10 at a point below the valve 12 to the upper end portion of the cylindrical chamber 24, and a cut-oft valve 32 is provided in this pipe.

From the foregoing description it is obvious that when the valve 32 is opened the entire boiler-pressure of the steam will be applied in the cylinder to hold the piston 30 to its downward limit of movement, thus tending to hold valve 12 to its seat.

In use we so proportion the diameter of the piston 30 relative to that ot' the valve 12 as to make the downward pressure upon the valve 12 almost counterbalance the upward pressure upon said valve caused by the steam-pressure under the valve 12, taking into consideration, of course, the multiplied power which lever 15 supplies.

I have also provided a spring between lever 15 and arm 18, arranged to normally hold lever 15 downwardly until a steam-pressure is applied to valve 12 sufficiently strong to counterbalance the resiliency of such spring.

This spring is applied as follows: The numeral 33 indicates a bar attached to the outer end of lever 15 by means of the bolt 34 and having a sliding plate 35 in its upper end and a similar plate 36 at its lower end, held in place by nut 37. An extensile coil-spring'38 is mounted upon said bar between the

plates

35 and 36. Attached to the outer end of arm 18 is a bar 38, held in place by means of bolt 39 and having a plate 40 at its top secured by nut 41.

The numeral 42 is used to indicate two rods having their ends secured in the

plates

35 and 40 by means of the nuts 43 and passed through openings 44 in the plate 36. Obvio'usly an upward movement of lever 15 will compress spring 38, and the resiliency of said spring is normally exerted in holding'the lever 15 toits downward limit. Obviously the tension of the spring may be quickly and easily adjusted by manipulation of the nut 37. As previously explained, the major portion of the upward pressure upon valve l2 is counterbalanced by the downward pull upon the lever l5, imparted by yoke 19 from the piston 30, and the remainder of the upward pressure upon the lever 12 is counterbalanced by the spring 38, and this spring may readily be set 'to permit the elevation of valve 12 when any certain predetermined amount of steam-pressure is applied thereto. I have also provided means whereby the valve 12 may be temporarily held firmly to its seat against any amount of steam-pressure, so that the various parts of the valve-controlling mechanism may be repaired or replaced Without shutting off the steam from the boiler as follows: The numeral 45 indicates a rod screw-threaded at 46 and having a hook 47 at its other end designed tooverlap lever 15 and enter notch 48 in said lever. 49 indicates a similar rod screw-threaded at 5011i a direction opposite from the screw-thread at 46 and having hook 51 at its other end to enter the notch 52 of arm 18, and a turnbuckle 53 connects these screw-threaded ends, the parts being so arranged that when the buckle is turned in one direction the rods will move together and when turned in opposite direction the rods will separate. Assuming, then, that it is desired to temporarily hold lever 15 downwardly', I place the hooks 47 and 51 over the lever l5 and arm 18 and turn the buckle 53 until it is in position to hold the lever to its downward limit, after which the end of the lever-operating devices may be detached for the purpose of repairing or replacement, and the valve 12 will be securely held in position.

In practical use and assuming the parts to be assembled, as 'shown in Fig. 1, I preferably proportion the parts so that the steampressure upon piston 30 will operate upon lever 15 in such a manner as to countcrbalance the major portion of the upward pressure of the steam upon valve 12, and the spring 38 is preferably placed at such tension that when the upward pressure upon valve 12 reaches a predetermined danger-point the said spring will be compressed and the valve elevated. Obviously this predetermined danger-point may be changed and the spring set in conformance thereto by manipulation of the nut 37.

Having thus described my invention, what I claim, and desire to secure by Letters Patent of the United States therefor, is*

1. The combination with a pop safetyvalve, of a steam-pressure device for holding the pop safety-valve to its seat the valve and steam-pressure device being` acted on from the same source of steam-supply, and a yielding pressure device coacting with the steampressure device for holding the pop safetyvalve to its seat.

2. The combination with a pop safetyvalve, of a steam-cylinder, a piston in the cylinder, means for connecting the piston with the safety-valve, said means operating to hold the valve to its seat and means for ICO IIO

conducting steam'to the said cylinder, and a spring tending to hold'the valve to its seat.

3. The combination with a pop safetyvalve of a piston, operated by steam from the same source as the steam pressing against the valve, the pressure uponV the piston tending to hold the valve to its seat, and a spring tending to hold the valve to its seat.

4. The combination with a pop safetyvalve, of a lever raised and lowered by the vertical movements of the valve, a steamcylinder communicating with the valve beneath the valve-seat anda piston in the cylinder connected with said lever, and a spring tending to hold the valve to its seat.

5. The combination with a pop safetyvalve, of `a lever raised and lowered by the vertical movements of the valve-stem, ayoke connected with said lever, a piston carried bythe yoke, a cylinder connected with the valve-casing, having said" piston therein and a steam-supply pipe communicating between the valve-casing beneath the valve and the said cylinder.

6. The combination with a pop safetyvalve, havingavalve-seat, a vertically-movable valve on the seat, a valve-stem connected with the valve, a lever lfulcrumed above the valve-casing, connectedwith a valvestem, a yoke attached to the lever, a piston carried by the yoke, an arm on the valvecasing, a cylinder carried by said arm and having said piston therein, and a steam-pipe communicating with the valve-casing beneath the valve and leading to the upper end of the said cylinder.

7. The combination with a pop Asafety- 'Lvalvehaving a valve-seat, a vertically-movcasing, a cylinder carried by said` arm and having said piston therein, and a steam-pipe communicating with the valve -casing beneath the valve and leading to theupper end of the said cylinder, a bar attached to said lever and an extensile coil-spring` encircling the bar, a bar attached to said arm, rods attached to said bar, a plate at the top of said rods in engagement with the top of the spring and the plate at the bottom of the first-mentioned bar in engagement with the lower end of the said spring.

8. The combination with a. pop safetyvalve, having a vertically-movable valve, of a lever fulcrumed to the top ofthe valvecasing and connected with the valve-steml, a bar attached to the said lever extending downwardly, a plate at the lower end of said bar, a nut on the bar beneath the, plate, an

arm formed on the valve-casing, a bar attached to said arm, a plate supported by said bar, a plate slidingly mounted on the firstmentioned bar, an extensile spring mounted on the rst mentioned bar between said plates and guide-rods fixed to the upper and lower plates and passed through the plate at the lower end of the upper bar, for the purposes stated.

9. -The combination with a pop safetyvalve of a lever raised and lowered by the vertical movements of the valve-stem, a yoke connected with said lever, a piston carried by the yoke, a cylinderconnected with valvecasing, having said Vpiston thereinv andV a steam -supply pipe communicating between the valve-casing beneath the valve and the said cylinder, and means detachably connected with said lever for positively holding the valve lto its seat. l

JOHN COLLIS.` Witnesses:

REUBEN G. ORWIG, J. RALPH ORWIG.