US325074A

US325074A - Blowing-engine valve

Info

Publication number: US325074A
Authority: US
Publication date: 1885-08-25
Anticipated expiration: 1902-08-25

Description

(No Model.)

F. W. GORDON.

BLOWING ENGINE VALVE.

No. 325,074. Patented Aug.25,1885.

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PATENT OEEICEo FRED. W GORDON, OF PITTSBURG,

ASSIGNOR TO GORDON, STROBEL &

LAUREAU, OF PHILADELPHIA, PENNSYLVANIA.

BLOWING-ENGINE VALVE.

.TSPECFIGATEON forming part of Letters Patent No. 325,074, dated August 25, 1885.

(No model.)

To @ZZ whom it may concern.-

Be it known that I, FRED. W. GORDON, of Pittsburg, Allegheny county, Pennsylvania, have invented cert-ain new and useful Improvements in Air-Valves for Blowing-Engines, of which the following is a specification. Thisinvention pertains to the air-valves for that class of blowing-engines which are used for delivering the blast to blast-furnaces and I3 thelike. `Such enginesgenerallyhavetheirairvalves arranged in groups upon the heads of the blowing-cylinder- The cylinders are gen erally vertical, and the suction-valves are disposed upon the interior surface or" the cylinder-heads. It follows that the suction-valves at the upper end ofthe ai r-cylinder open downward, while the suction-valves of the lower end open upward. rPhe air-cylinders of the blowingengines are often very large, and all 2o the cylinder-head attachments are large and cumbersome. The air -valves require occasional attention, and the problem has been to secure a durable air-valve so arranged as to permit its inspection, repair, or renewal in the shortest possibletime. Blast-furnaeesrun continually night andday, and it is not praetical to have their blowing-.engines remain off duty for any considerable length of time while their air-valves are being attended to.

My invention will be readily understood from the following description, taken in con nection with the accompanying drawings, in which- Figure lis a vertical section of an air-valve illustrating my invention, the same being represented in connection with a seatholding plate, which may be taken as representing the lower cylinder-head of a blowing-engine; Fig. 2, a plan of the same with portions broken 4o away in order to more clearly exhibit the structure, and Figs. 3 and 4 vertical sections illustrating modifications in the plan of connecting the valve-seat to its supporting-plate.

In the drawings, A indicates a valve-supporting plate, which may be the cylinder-head of the blowing-engine or valvefholding plates secured over openings in the cylinder-head;

B, grated circular disk-like seats disposed in appropriate openings in the plate and forming, substantially, a separable seat portion of such plate; C, a cage whose legs rest upon the plate around the opening containing the sea-t, the legs being formed on a spider which is disposed parallel to the face ofthe seat; D, a bolt passing from the spider through the seat; E, a disk ofleather or other soft material resting upon the seat and forming the valve proper; F, the tapering fit of the seatwithin the opening of the seat-holding plate; G, Fig. 3, amodiiication of the manner in which the seat engages the plate, the same consisting in the seat being screwed into the plate; H, Fig. 4i, another modification ofthe same, in which the seat is provided with a peripheral rabbet engaging in a counterbore ofthe plate against packing J.

Fig. l represents the disposition of a suction-valve upon the lower end of the cylinder; and it will be readily understood that the valves at the upper end of the cylinder will 7g present their cages downward, as will be readily understood it' Fig. l be turned upside down for the purpose of viewing. It will thus be understood that the valves and the cages are within the cylinder. Access can only be had 7 5 to theaircylinder by the removal of the bulky cylinder-head, and hence it is very desirable that the valves should be accessible from the outside of the cylinder-heads. By removing the nut upon the bolt the seat may be removed outwardly from the plate, the valve following and the cage remaining in its normal position. New valves or new seats may thus be inserted without the necessity for entering the cylinder or removing the valveholding plates. In the 8 5 ease of the valves at the lower end of the cylinder, as illustrated in Fig. 2, it is evident that the cage and its holdingboltwill maintain their normal position upon the plate after the nut and seat are removed, gravity holding the 9o cage and bolt in normal position; but, in the case of the valves at the upper end oi' the air cylinder, it is evident that the cage and bolt would tend to fall down into the cylinder. Such serious occurrence is avoided, when manipulating the upper valves, by moving the piston of the blowing-engine to the upper end of its stroke, so that the cages and bolts, while they may leave the plate, cannot drop more than a quarter of an inch or so, in which ease Ioo ing required, especially if the periphery of the valve be allowed to project slightly over the joint-crack at the periphery of the seat. It will be noticed that the seat is susceptible of being removed from that side of the plateY opposite the side on which the cage seats, and that the valve can be removed from the same side of the plate that the seat is removed from, and that the bolt which holds the seat also serves in securing the cage.

The valve,being of soft material and of large size, cannotbe properly guided upon a central bolt, and no proper guiding fit can be durably secured at that point. The peripheral guiding is therefore provided by means of the legs of the cage. These valves seat accurately, promptly, and tightly, and are extremely durable. The cage forms at once the guide for the periphery of the valve, the stop for the lifting movement of the valve, and the clamping element by which the seat is secured in place. These valves are to be arranged in groups upon the cylinder-head of the blowing-engine, and they enable the piston of the engine to operate very closely to the seat-snrface,whereby dead-space is avoided.

I know of' no other valve device employing a cage possessing these properties. Where cages have been employed, they have been secured to the plate byperipheral bolts, which are expensive and inaccessible for blowingvalves, or by abutments against them, which interfere with the proper approach of the piston of the blowing-engine, or by being screwed into the plates. The cages as I arrange them stand upon the flat surface of the plate, and

interfere to the least possible degree with the 4 5 outow of air from the valve-opening. The arrangement also permits of exceedingly close and compact grouping of the cages upon the plate.

I claim as my invention- 1. In a blowing-engine valve, a valve-holding plate provided with an opening for a valveseat, a disk-like seat disposed within such opening and removable from the outside of the plate, a disk-like Valve engaging the face of the seat, a spider-like cage with its legs resty ing upon the side of the plate opposite to the side from which the seat is inserted,and a bolt passing through the cage and seat and serving-` to hold the seat in the opening of the plate and the cage against the face of the plate, combined substantially as and for the purpose set forth.

2. In a blowing-engine valve', a plate provided with a grated valve-seat, a spider-like cage with its legs resting upon said plate around said seat, a bolt passing through the cage and seat, and a disk-like valve engaging the face of the ,said seat,and engaging with its periphery the interior surface of the legs of the cage, and adapted to play between the roof of the cage and the seat, combined substantially as and for the purpose set forth.

3. In a blowing-engine valve, aplate having