US247641A

US247641A - hayes

Info

Publication number: US247641A
Authority: US
Publication date: 1881-09-27
Anticipated expiration: 1898-09-27

Description

(No Model.)

J. W. HAYES.

STEAM ENGINE VALVE. No! 247,641. Patented Sept. 27,1881.

WITNESSES:

D INVENTOR:

Z ATTORNEYS.

UNITED STATES PATENT OF IC JoHN W. HAYES, or FORT WAYNE, INDIANA, ASSIGNOR T0 JOHN H. BAss,

OF SAME PLACE.

STEAM-ENGINE VALVE.

SPECIFICATION forming part of Letters Iatent No. 247,641, dated September 27, 1881. Application filed June 27, .1881. (No model.)

To all whom it may concern.-

Be it known that I, JOHN W. HAYES, of Fort Wayne, in the county of Allen and State of Indiana, have invented certain useful Improvements in Rotary Valves for Steam-Engines, of which the following is a specification.

This invention relates to that class of engine-valves that areknown as rotaryvalves and it consists of a cylindrical hollow valve open at top and bottom and closed at both ends, and having concave sides provided with annular and longitudinal packing strips or bands, and with novel devices for givingit an oscillating and slightly endwise motion, all of which will be hereinafter set forth.

Figure 1 is a cross-section of the improved valve in position on a steam-cylinder. Fig. 2 is a sectional elevation of the valve-chest and portion of cylinder on line at m, Fig. 1. Fig. 3 is a longitudinal partly-sectional elevation of valve and valve-stem. Fig. 4 is a plan of a portion of the valve-stem. Fig. 5 is an end elevation of the valve on liney y, Fig. 3.

Similar letters of reference indicate corresponding parts.

In the drawings, A represents the enginecylinder, and B the valve-chest attached thereto, in which the valve-seat O is supported on studs a a, so that an exhaust-passage may be formed beneath said seat 0.

D represents the valve, consisting of a hollow cylindrical vessel closed at both ends, and

- provided with annular ribs b, formed at equal distances apart throughout its length, to increase its strength and give it suitable bearings. Said valve D is also open along its top between the ribs 1), and between the end ribs, b,and thevalve ends,for theadniission of steam, as indicated at c, and open in the same manner along its bottom, as indicated at d; and at corresponding and opposite pointsthe sides 7" of said valve D are inwardly indented, thus forming a series of coneavities, g, that permit the escape of exhaust-steam from the cylinder; hence, in effect, the concave sides of the valve D are held in position by the annular ribs b, and the lower and upper convex edges of these sides f form the valvular portion of said valve D. In the bottom of the lower edges are formed longitudinal slots it, into which are fitted metallic packing-strips it, that are designed to be pressed outward by the steam forced into the passages 70 k, that communicate with the inside of the valve D and the slots h h, whereby the bottom of the valve D is kept tight on its seat 0. Annular packing-rings ll are also fitted about the ends of the valve D, and are pressed out by steam entering from the interiorof said valveD into the passages m. Being open in equal degree at top and bottom, this valve D is so far a perfectly-balanced valve; but the pressure of the steam upon the packing-strips t i throws the said valve D out of balance by the sum of the area of said strips t i multiplied by the steam-pressure, minus the weight of the valve.

The valve-stem E is provided with a T-head, E, that is loosely inserted in a corresponding opening, a, in the head of the valve D, so that the said valve D may have alittle play up and down, independently of the said stem E, and on said stemE is a screw-thread, o, whosefunction will be hereinafter set forth.

The valve D is put in position in the valvechest B, with one portion of its stern E resting in the stuffing-box p and gland p, and with its screw-thread 0 in the female screw-thread q, formed in the brace F, that is secured on the end of said valvechest B, and a connectingrod, G,is secured on said stem E outside of the brace F, whereby said valve D is operated.

Said valve D being put in motion-oscillatedthe engagement of the screw 0 in the screw q gives to said valveD a slight endwise motion,in combination with the oscillating motion, whereby the wear upon said valve D and its seat 0 and interior of the valve-chest B is made more even. These screws 0 q may be dispensed with and the results they are designed to produce be efi'ected by fixing a curved wedge, r, on the head of the valve D, as shown in Figs. 3 and 5, and a corresponding wedge, s, on the inside of the head of the valve-chest B, as shown in Fig. 2, so that when in position the inclined faces of said wedges a" s shall be in contact, and so that when said valve D is put in motion the wedge 1" moving on the wedge s will give said valve D an endwise mo tion.

The valve-stem E is held in the valve by *a key, t, driven through the slot u, that is made in the end of said stem E, which is prolonged into the said valve D, and whether the screws 0 q or wedges r s are used, the key it must be a sufiicient distance from the valve-head to permit suitable end movement of said valve, as set forth.

The engine beingin operation, steam enters 1 through the supply-port H into the valve D,

and as said valve 1) is oscillated from the position shown in Fig. 1 the steam escapes therefrom into the cylinder A through one or the other of the ports I, as the case may be, while at the same time the exhaust from the cylinder A escapes through the other port 1 into the space K between a side of the valve D and the valve-chest O, and thence through the'passage L to the exhaust-port M.

I am aware that cylinder-valves have been constructed somewhat upon this principle; but I am not aware of any of this peculiar construction, or of any so nicely balanced and so durable.

Having thus described my invention, I claim as new and desire to secure by Letters Paten t-- 1. The hollow cylindrical valve D, closed at both ends, having openings at top and bottom between annular ribs b and at the valve ends, and provided with concavities g, as shown and described.

2. The combination, with the valve-chest B and valve D, of the concave valve-seat U, supported on studs a a, substantially as herein shown and described, whereby an exhaust-passage is formed beneath said seat, as set forth.

3. The combination, with the valve D, havin g opening 12, of the T-headed valve-stem E E, having the thread 0, the brace F, having the female screw-thread g, the stuffing-box p, and the gland p, as and for the purpose specified.

JOHN W. HAYES.