US715706A - Balanced automatic safety-valve. - Google Patents

Description

No. 7|5,706. Patented Dec. 9,1902.

H. P. TIPPETT.

BALANCED AUTOMATIC SAFETY VALVE. A Application filed Mar. 8, 1902.,

(No Model.) 2 Sheets-Sheet 1.

No. 715,706. Patentd Dec. 9. I902.

' n. P. T!P PETT.

BALANCED, AUTOMATIC SAFETY VALVE.

gApplicntion-flled Mar. 8, 1902.

(No llmlal.) 2 Sheefs-6het 2.

U-H ranes.

ATET 'FFECE.

HAROLD P. TIPPETT, OF COLUMBUS, OHIO.-

BALANCED AUTOMATIC SAFETY-VALVE.

SPECIFICATION forming part of Letters Patent No. 715,706, dated December 9, 1902.

Application filed March 8, 1902. Serial No. 97,320- (No model.)

To aZZ whom it may concern:

Be it known that I, HAROLD P. TIPPETT, a citizen of the United States, residing at O0- lumbus, in the county of Franklin and State of Ohio, have invented certain new and useful Im provements in Balanced Automatic Safety- Valves, of which the following is a specifica I clusively by the boiler pressure.

A further object of the invention is to provide a valve-body having an upper and lower seat separated by exhaust-ports and a steamoperated vessel to engage said seats.

A further object of the invention is to provide in a safety-valve a vertically-slidable main valve actuated by steam and having a central bottom opening, a valve-cap having a neck provided with exhaust-ports and a hollow stem provided with induction-ports and engaging the said opening, and a spring plunger-valve operated in and between the said neck and the said stem.

A still further object of the invention is to provide in a safety-valve a simplified construction of parts, that they may be readily assembled, removed, and renewed, and to arrange and connect the parts in such compact manner that the valve will occupy much less space than and have the same capacity as any other valve of this character known to applicant.

Various other objects, advantages, and improved results attained by this valve will be disclosed in the specification and pointed out in the claims to follow.

In the accompanying drawings, forming part of this application, Figure 1 is an elevation of the valve in condition to be applied to Fig. 4 is a top view of the valve-body. Fig. 5

is a top view of the slidable main valve. Fig. 6 is a detail elevation of the plunger. Fig. 7 is a central vertical section ofthe valve-cap. Fig. 8 is a. sectional view of means for adjusting the spring. Fig. 9 is a sectional view showing several modifications. Fig. 10 is a sectional view of a further modification of said means.

The same numeral references denote the same parts throughout the several views of the drawings.

The valve-body consists of an outer casing 1, adapted to be attached to a locomotive or other steam boiler and having a series of ports 2, separated by ribs 3, which join to the casing 1 an inner shell 4:. A circular valveseat 5 is formed at the intersection of the ports 2 and induction-port 6 of the casing 1. A circular seat 7 is made in the shell 4, and between the seat 7 and an internal screwthread 8 of the shell is a bearing 9.

The valve-cap 10 comprises an externallyscrew-threaded flange 10, fitting the thread 8 and having an upwardly-extended screwneck 11, provided with ports 12, and a downwardly-extended hollow stem 13, provided with ports 14. The interior of the stem 13 is provided with a valve-seat 15 below the ports 14 and a like seat 16 at the ports 12.

The main valve 17 has an open top oflarger area than the bottom, the latter having a central opening 18, surrounded by an inner rim 19, so as to leave a circular pocket 20,- into which opens through the bottom of the valve 17 induction-apertures 21. This pocket receives steam from the ports or apertures 21. The bottom of the valve 17 has a valve-seat 22, and a like seat 23 is formed on the enlarged top portion of the valve. This valve slides vertically on the stem 13 under action of steam from the boiler, and its seats engage with the seats 5 and 7, so that a double seating of the valve 17 is efiected.

The plunger-valve 24 is cup-like and has lower and upper valve- seats 25 and 26, respectively, between which is a reduced portion 27.

These seats engage the valve-seats and 16, according to the vertical sliding of the plunger by steam-pressure. The plunger contains a spring 28 of slight resistance for controlling the plunger, and the springis confined by a cap-nut 29, secured to the neck 11. A suitable muffler or muiflers completes the valve, and I prefer to use an outer muffler 30 and a conical inner m uffier 31.

Various forms of means for adjusting and regulating the plunger-spring may be employed, if found necessary; but the preferred form is shown in Fig. 8, and the structure is as follows:

The nut 32 has an internal screw-thread in which a regulating-screw 33 works, having a shoulder 34 and projection 35 for the spring. A hook 33 covers the adjusting means and secures the mufflers to the cap-nut.

In the modification shown in Fig. 9 an externallythreaded sleeve 36 is secured in the nut 37, and a rod 38 is operated on the spring through the sleeve by a set-bolt screw 39. In this form of valve the cap-stem 40 has no valve-seat and the plunger 41 has only one seat, while there is no seat in the inner shell 42.

Referring to the modification shown in Fig. 10, the screw-sleeve 43 has arms 44, in which is fulcru med a relief-lever 45 to operate a rod 46, engaging the spring.

I wish it to be understood thatin the practical application of this valve various other minor modifications producing substantially the same results may be efiected without departing from the spirit of my invention.

Taking the parts as shown in position Fig. 2, the operation is as follows: Steam-pressure on the bottom of main valve 17 is carried into said valve by its induction-ports2l, so that the thus-carried steam acts on a greater area of the Valve upon the inside than upon the bottom or outside and holds the valve seated. When steam-pressure on the plunger equals or is slightly greater than the spring-pressure thereon, the plunger-valve is opened by pressure of steam and permits the steam in the pocket 20 and in the valve 17 to escape through the ports 12 and 1 1- faster than the said valve is supplied with steam through the induction-ports 21, whereupon the Valve is raised or opened by the pressure of steam on its bottom, caused by the opening of the plunger-valve, and the boilerpressure is relieved. When the boiler-pressure is reduced enough to permit the spring to close the plunger down, the steam-pressure of the valve is again confined above the valve 17 and closes it.

It will be observed that the peculiar con- .Struction of the main valve 17, with its larger upper portion and bottom steam-ducts 21 of smaller size than the ports 12 and 14:, produces a greater interior area for the action of steam therein than the exterior steam-actuated surface or main-valve bottom, and hence the said valve is operated exclusively by the boiler-pressure.

from the boiler balances and holds the main valve to its seat, and the force of the steam increases on the vessel as the steam rises through the valves until the release-point is reached.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a safety-valve, a steam-operated main valve having an open top of larger area than the bottom, said bottom having ducts therein and an opening therethrough forming a hearing for the main valve in its vertical movement, and a vertical slidable spring -plunger valve operated by steam from said opening.

2. The combination in a safety-valve, of a main valve having an open top and bottom, a cap or cover having a stem upon which the main valve works, and a spring-controlled plunger working in the stem and through the cap.

3. A balanced automatic safety-valve, comprising a body having valve-seats, a valvecap having a depending stem provided with valve seats and ports, a main valve having a reduced bottom and provided with seats to engage the valve-bod y seats, said bottom having ducts and a central opening to permit the main valve to slide, and a spring-plunger having seats to engage the valve-cap seats.

4. The combination in a safety-valve, of a main valve having an inner bottom rim surrounding a central opening and forming a steam-pocket, induction-ports to the pocket, a cap or cover having a stem upon which the main valve works, and a spring-controlled plunger working in the stem and through the cap.

5. The combination in a safety-valve, of a main valve having an open top and a cen trally-open bottom of smaller area than the top, a series of induction-ports in said bottom around the said opening, a cap or cover having a stem depending into said opening and provided with ports, and a spring-controlled plunger operated in the stem and through the cap.

6. Abalanced automatic safety-valve, comprising an outer casing having a valve-seat, an inner shell having a valve-seat, a valve having upper seats to engage respectively the shell-seat and the casing-seat, the upper portion of the said valve being of larger area than the bottom thereof, the latter having ducts and a central opening, a valve-cap having an upper neck and a lower stem provided with ports, said stem extending into said opening so that said valve will slide thereon, and a springplunger actuated by steam through the cap, stem and neck simultaneously with the working of the valve.

7. The combination, with the valve-body, and the cap covering a portion of said body and having a top neck provided with ports,

IIO

and a hollow bottom stem with ports, of a ing, valve-seats on the cap, like seats in the main valve slidable over the cap-stem by stem, and a spring-controlled plunger having steam-pressure, and a spring-p111 nger or valve upper and lower seats to engage the cap and having a reduced portion and actuated by stem seats. 15 5 steam through the said cap. In Witness whereof I hereunto set my hand 8. The combination in a safety-valve, of a i in the presence of two witnesses. main valve having an open top and bottom, an inner rim surrounding the bottom opening HAROLD HPPETT to form a steam-pocket, induction-ports to the Witnesses: vo pocket, a cap or cover having a stem provided CHARLES S. M. KRUMM, with ports and depending into the said open- NORMAN L. HAYDEN.

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