US913899A - Gas-cut-off valve. - Google Patents

Description

J. S. JOSEPH.

GAS GUT-OFF VALVE.

APPLIOATION FILED APR. 27.1903.

Patented Mar. 2, 1909.

2 SHEETS-SHEET 1.

WITNESSES. :LNVENTOR J. S. JOSEPH.

GAS GUT-OFF VALVE.

APPLICATION FILED APR. 27.1908.

91 3,899. Patented Mar. 2, 1909.

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JESSE S. JOSEPH, OF PITTSBURG, PENNSYLVANIA, ASSIGNOR OF ONE-FOURTH TO ALBERT J. E. WILSON, JR., OF PITTSBURG, PENNSYLVANIA.

GAS-CUT-OFF VALVE To all whom it may concern:

Be it known that I, JnssE S. JOSEPH, a resident of Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Gas-Cut-Off Valves; and I do hereby declare the following to be a full, clear, and ex act description thereof.

This invention relates to gas cut-off valves, and is more especially intended to be used as a gas valve for blast furnaces, such as cutting off the gas in the mains.

The object of the invention is to provide a valve for this purpose which effectually cuts off the gas and especially one which holds the pipe or conduit closed under the heavy pressures caused by explosions.

The invention comprises the construction and arrangement of parts hereinafter described.

In the accompanying drawings Figure 1 is a vertical section through my improved valve; and Fig. 2 is a sectional view of the up er portion of the valve on an. enlarged sea e.

In the drawings 1 represents a casing preferably lined with fire brick or other lire resistin material, and inclosing a vertical chamber 3 preferably cylindrical in cross section. Entering this chamber some distance above its lower end is the inlet pipe 4 which may come from the blast furnace or any other suitable source of blast furnace gas. In the bottom 6 of the chamber 3 is an open ing to which is connected the outlet pipe 7 which may lead to the gas washers, dust catcher, stoves, boilers or any other suitable destination. Projecting upwardly in the chamber 3 and surrounding the outlet opening 6 is a circular pipe or casing 8 which in effect is an extension of the outlet pi e 7. This pipe 8 projects upwardly in the 0 am ber to a considerable distance, forming be tween the same and the walls of the chamber a space 9 which contains water, said water being supplied by a ipe 10 entering the chamber at 11 a consic erable distance above the top of the pipe 8. An overflow pi e 12 enters the chamber at 13 and this c etermines the level of the water maintained in the space 9, which level is fairly well up toward the top of the upwardly projecting Specification of Letters Patent.

Application filed April 27, 1908.

Patented March 2, 1909.

Serial No. 429,447.

pipe 8. The bottom of the chamber is provided with draining outlets 14.

The upper end of the pipe 8 is provided with a suitable valve seat, which may be formed directly on the pipe but which preferably is formed by a ring 15 suitably secured to the pipe, such as by bolts 16. This ring 15 is of considerable thickness, as shown, and has its upper edge preferably beveled from both sides, as shown at 17.

The valve is of inverted cup shape comprising the heavy cast bottom 18 having depending therefrom the bell portion 19 which projects down into the space 9 and into the water contained in said space so as to form a water seal. The sides 19 may be integral with the bottom 18, or separate therefrom, as shown, being connected to the same by rivets 20 passing through said portion and an annular flange 21 on the bottom 18. The bottom 18 is provided with a face 22 corresponding to and cooperating with the valve seat 17 on the pipe section 8, said face being of shallow V-shape which is the complement of the double bevel seat formed on the ring In this way a tight seal is formed at this point, the parts contacting over a broad area, viewed radially, one part fitting somewhat into the other so as to form a tight joint at this point. The seat 17 and bearing face 22 are accurately finished so as to fit closely together. The sides 19 of the cup valve are as close to the pipe 8 as is practical on account of the warping to which such valves are liable. This provides between the cup wall 19 and the pi e 8 a narrow column of water to counter Balance the pressure, with a larger body of water outside of the cup. The consequence is that on high pressures, such as due to explosions, the mass of water which must be displaced is sufficient to renew the counter balancing column inside the cup walls several times. Since the caps fits closely upon the seat the water can be driven through this seat only very slowly, if at all, and the excessive pressure of an ex plosion does not continue sufficiently long to drive through this seat all of the water contained in the counter-balancing water column. The consequence is that no gas whatsoever can pass the valve when closed.

The valve is very heavy and when seated is held against the valve seat not only by gravity but also by the gas pressure above the same. Any heavy pressures, such as due to explosions, act upon the surface of the water contained in the space 9 and tend to drive the same up in the space 23 between the pipe section 8 and the cupshaped valve over the same, and tend to force the same over the top of the pipe section 8. Vfith my valve, however, the tight seat formed between the bottom of the cup-shaped valve and the top of thepipe 8 effectually blocks the passage of water at this point, and as the valve cannot rise on account of the gas pressure on top of the same the water cannot be blown down into the outlet pipe so as to per mit gas to follow the same. My valve ineffect is a double valve, one valve being the water seal formed by the cup dipping down into the water, and the other being the mechanical contact between the bottom of the cupr and the top of the outlet pipe.

he valve is provided on its top with an annular flange 24 inside of its outer periphery. This flange 24 as well as the outer peripheral flange 21 provides gutters or basins 25 and 26. Since the valve when closed is below the inlet of the water supply pipe 10, these gutters become filled with water. When the valve is lifted a flange 27 on the top of the casing projects into the gutter 26, so that a water seal is formed at this point. This permits the cap 28 to be removed for repairs and the like.

The valve has connected thereto an operating rod 29 extending through a stuffing box 30 in the cap 28. The rod 29 may be operated by any suitable mechanism, th drawing showing cables 31 connected thereto which serve to raise the valve. The valve is lowered by merely slacking the cables 31 and dro s and seats itself by gravity.

Ti e operating rod 29 at its lower end is provided with a ball member 33 which proj ects down into a cavity 34 in the top face of the valve. It is surrounded by a plate 35 secured to the valve and provided with an opening engaging the ball 33. The walls of this opening are formed on straight inclined lines, so that said opening represents a truncated cone. The consequence is that a straight surface bears against the spherical surface of the ball 3, as clearly shown in Fig. 2, so that the contact is on a circle only. This greatly reduces friction and prevents sticking.

My valve may be used in any place where large gas mains are to be out off and is especially useful in such locations where the gas is liable to sudden increases of pressure, such as due to explosions in blast furnaces. The valve provides a. double seal, one the water seal, and the other a mechanical one through which the water must be forced before any gas can pass. The mechanical seal acts as an absolute check for the water, which, of course, is less mobile than gas.

What I claim is:

1. In a gas cut-off valve, the combination of a chamber having an inlet thereto and having an outlet opening, a pipe surrounding said opening and projecting upwardly into the chamber, a liquid supply and overflow arranged to maintain a body of liquid around the upwardly projecting pipe, said pipe having at its upper end a valve seat, and a deep inverted cup valve arranged to fit closely over said pipe and have its bottom seat on the end of the pipe and its sides project down into the body of liquid and forming a liquid seal.

2. In a gas cut-off valve, the combination of a chamber having an inlet thereinto and having an outlet opening, a pipe surrounding said outlet and projecting upwardly into the chamber, a liquid supply and overflow arranged to maintain a body of liquid around the upwardly projecting pipe, said pipe being provided at its upper end with a broad valve seat, a deep inverted cup-valve arranged to fit over said pipe and having its bottom provided with a broad face corresponding to and closely fitting the valve seat on the pipe and its sides arranged to project down into the body of liquid and form a liquid seal.

3. In a gas cut-off valve, the combination of a chamber having an inlet thereinto and having an outlet, a pipe surrounding said outlet and )rojecting upwardly into the chamber, a fiquid supply and overflow arranged to maintain a body of liquid around the upwardly projecting pipe, said pipe being provided at its upper end with a double beveled valve seat, and an inverted cup-shaped valve arranged to fit over said pipe and having its bottom provided with a ii-groove arranged to fit the seat on the pipe and having its sides arranged to project down into the body of liquid and form a liquid seal.

4. In a gas cut-off valve, the combination of a chamber having an inlet thereinto and provided with an outlet, a pipe surrounding said outlet and projecting upwardly into said chamber, an annular valve seat member secured to the top of said pipe, a liquid supply and overflow arranged to maintain a body of liquid around the upwardly projectin outlet pipe, and a deep inverted cupvt ve arranged to fit closely over said pipe and having in its bottom a groove arranged to seat on the valve seat member and having its sides project down into the body of liquid and form a liquid seal.

5. In a gas cut-ofi valve, the combination of a chamber provided with an inlet thereinto and having an outlet, a pipe surrounding said outlet and projecting up into the chain- I tacting with the spherical member on the her and provided at its upper end with a operating rod.

valve seat, an inverted cup-shaped valve arranged to seat on said pipe, an operating rod for said valve provided at its lower end with a spherical member, and a plate connected to the valve and having therethrough an opening providing a conical surface con- In testimony whereof, I the said J EssE S. JOsEPI-I have hereunto set my hand.

JESSE S. JOSEPH. l/Vitnesses:

F. W. WINTER, ROBERT C. TOTTEN.

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