US309610A

US309610A - Steam actuated valve

Info

Publication number: US309610A
Authority: US
Publication date: 1884-12-23
Anticipated expiration: 1901-12-23

Description

(No Model.) 7 4 Sheets-Sheet 1.

G. E. DOW.

STEAM AGTUATED VALVE. No. 309,610. Patented Dec. '23. 1884.

(No Model.) 4 Sheets-Sheet 2.

G..E. DOW.

STEAM AGTUATED VALVE.-

No. 309.610. Patented Dec. 23, 1884.

(No Model.) 4 Sheets-Sheet 3.

G. E. 110W.v

STEAM AGTUATED VALVE. No. 309,610. Patented Dec. 23, 1884.

-N. PETERS. P mwumogrn mr, Washington, D. c

(No Model.)

4 SheetsSheet 4.

G. E. 110w. STEAM AUTUATED VALVE.

Patented Dec. 23, 1884.

Ihvrrnn dramas .a'rnsrr rricnl GEORGE E. DOW, OF SAN FRANCISCO, CALIFORNIA.

STEAM-ACTUATED VALVE.

SPECIFICATION forming part of Letters Patent No. 309,610, dated December 23, 1884.

Application filed December 14,1853.

To all whom it 77mg concern.-

Be it known that I, GEORGEE. Dow, of the city and county o'fSan Francisco, and State of California, have invented an Improvement in Steam-Actuated Valves. for Direct Acting Steam-Engines; and I hereby declare the following to be a full, clear, and exact description thereof.

My invention relates to certain improvements in direct-acting steam-engines.

It consists of a main cylinder with a piston reciprocating therein, apiston-rod connecting the piston with the exterior apparatus to be moved thereby, a combination of main and auxiliary valves and corresponding ports, and an auxiliary piston by which both valves are moved, the stem of said valve being connected by a mechanism outside of the cylinders with the main piston-rod, so that a positive motion is imparted to the valves, and a bracl et and guide for the sliding sleeve, through which motion is communicated to the supplemental or steam-chest piston, with its main and auxiliary valves, from the main piston rod, together with certain details of construc tion, which will be more fully explained by reference to the accompanying drawings, in which- Figure 1 is a longitudinal vertical section of my engine through a m, Fig. 3. Fig. 2 is an enlarged vertical section of the valve-chainber, supplemental piston, main and auxiliary valves, and steam-ports. 3 is a trans verse section taken through 3/ y, Figs. 1 and 2. Fig. I is a transverse section through 2 .2, Fig. 1. Fig. 5 is a plan of the valve-faces, showing the ports. Fig. (i is abottom view of the anxiliary valve in perspective. Fig. 7 is atop view of same in perspective.

This invention is more particularly applicable to an engine for which Letters Patent were issued to me January 10, 1882, and nam bered 252,084. In this patent I have stated that any mechanism may be employed for operating the valves which will give a positive connection with the main piston or rod to impart motion in the proper direction and ad mit of the valves completing the latter half of the stroke by steam-pressure independent of the movement of the main piston, and I have (No model.)

shown a mechanism by which this may be accomplished.

In my present invention I have shown another mechanism for accomplishing the same result, with certain improvements which I will proceed to describe.

A is the main cylinder of my engine. 13 is the piston, and G is the piston-rod, which passes through a stuiiingbox, D, in one cylinder-head, and niay pass through another stuffingbox in a pump-cylinder head connecting with the pump-piston, so as to drive it directly when the engine is used in connection with a pump.

E is the steanrchest and valve-chamber, within which the main and auxiliary Valves F and G are moved over their respective ports.

H is the supplemental or auxiliary piston, [he ends of which fit and move in cylindrical chambers, and the central portion is recessed to receive the valves, the ends of the recess acting to move the valves when they come in contact with them while moving in either direction, as shown in my former patent. In the present casethe auxiliary valve G is made of such a length that its ends never uncover the steam-passages I l, which lead to the ends of the sup oilemental pistonchambers; but it has ports J J made vertically through it, through which steam is admitted to the passages while said ports are passing over them. As the auxiliary valve fits closely the recess in the supplemental piston by which it is driven, it is moved the full length of the stroke of the latter,while the main valve, being shorter, is not moved until after the auxiliary valve port J has commenced to open, as shown in my former patent. When this port does open, steam is admitted to the chamber behind the supplemental piston to complete its stroke and fully open the main valve. It also carries the auxiliary valve over so far that the port J is carried beyond the passage I, and it is again closed so that no more steam will be admitted. The passages I Iarc so located where they open into thesupplemental cylinders that they ofi'er suiiicient cushion on the eXhaust-steanr to prevent their striking the cylinder-heads, as shown in my former patent.

The effect of my improved valve is to cut OH the steam from the acting side of the supplemental piston when the valves have moved far enough to fully open the main ports. This makes the exhaust-cushion still more effective than before, as the steam is cut off from acting upon the opposite end of the supplemental piston.

K is the stem or rod of the supplemental piston which drives the valves. This rod extends out through a stuffing-box above 'and parallel with the main piston-rod, and has a sleeve, L, fitted to slide loosely upon it. A bracket, M,.is bolted to or formed with the head of the supplemental cylinder, and its outer end is bored out large enough to allow the sleeve to slide within it as aguide, thus giving a proper alignment ofthe moving ports and a steadiness to the movements, which is important.

N N are links, the'upper ends of which are connected by pins with the opposite sides of the sleeve, and O O are short links extending from the sides of the bracket to the links N, to which they arepivoted ashort distance below the pins which join them to the sleeve, and they act as fulcrums about which the links N move. The lower ends of the links N are connected by links P with a block or collar, Q, which is fixed to the main piston-rod.

The supplemental piston rod K is made of larger diameter outside the cylinder, and where it passes through the sleeve L, and has screwthreads out upon this enlarged portion to receive the nuts S,which are thus adjusted to or from the sleeve L. The stroke of the main piston is thus regulated so that it works at all times as closely as practicable to the cylinderheads. The space between these nuts and the ends of the sleeve is suificient, so that after the valve has been started by the action of the lever-links N the supplemental piston will be moved the remainder of the distance of its stroke by steam admitted through the passage I independent ofthe movement of the main piston-rod or of the connecting-levers. The links 0 and I? allow the links N to describe an arc of a circle while following the reciprocating movement of the main piston without affecting the direct reciprocation of the sleeve L.

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

1. In a direct-acting engine, the combination of the main and auxiliaryvalve-rod with a sleeve sliding thereon between adjustable stops, a bracket forming a guide and support for the sleeve and rod, and the link connect ing the sleet e to the main piston-rod, whereby the auxiliary valve is positively operated by the engine, and the main valve by steam, substantially as herein set forth.

2. In a direct-acting engine, the combination of an auxiliary valve and a main valve, placed side by side and driven by a supplemental piston, with a piston-rod extending through the cylinder-head and connected by links with the main piston-rod, adjustable nuts fitted to the supplemental piston-rod,abracket, and a sleeve sliding upon the rod between the nuts and in the brackets, substantiallyas and for the purpose herein set forth.

3. In a direct-acting engine, the combination of a supplemental piston for actuating both main and auxiliary valves, having a piston-rod extending outside the cylinder parallel with the main piston-rod, with two adjustable collars thereon, a sleeve sliding loosely upon said rod between the collars and moving within a bracket secured to the supplemental cylinder, and the parallel arms pivoted upon each side of the sleeve and connected with the' guide by fulcrum-links, the opposite ends of the arms being connected with a collar upon the main piston-rod by links, all constructed to operate substantially as herein set forth.

4:. In a direct-acting engine, a main and auxiliary valve moving side by side upon a stationary valve-seat, a supplemental piston centrally recessedto receive and drive both main and auxiliary valves, and steam-pas- 9o sages leading from the auxiliary valve-seat and opening into the supplemental cylinder near the ends, said auxiliary valve being of sucha length that its ends will not uncover the steam passages, and having ports made through its 9 5 ends corresponding with said passages, substantially as herein described.

5. In a direct-acting engine, a main and an auxiliary valve placed side by side upon the stationaryseat, having ports, as shown, and ICO an auxiliary piston recessed or constructed to drive both valves, the main valve being shorter than the auxiliary valve and having lost motion, said auxiliary valve having ports made through its ends so as to open and close the I05 steam-passages at both ends of the stroke, substantially as herein described.

In witness whereof I have hereunto set my hand. 1

GEO. E. DOW.

\Vitnessesz" O. D. COLE, J. H. BLooD.