US881486A

US881486A - Throttle-valve mechanism for steam-engines.

Info

Publication number: US881486A
Authority: US
Inventors: Gustav B Petsche
Original assignee: SOUTHWARK FOUNDRY AND MACHINE Co
Current assignee: SOUTHWARK FOUNDRY AND MACHINE Co
Priority date: 1906-03-26
Filing date: 1906-03-26
Publication date: 1908-03-10
Anticipated expiration: 1925-03-10

Description

No. 881,486 PATENTED MAR. 10, 1908,

G. BLPBTSGHE.

THROTTLE VALV E MECHANISM FOR STEAM ENGINES.

APPLICATION FILED MAR. 26, 1906.

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PATENTED MAR.10, 1903.

0 I G. B; PETSGHE.

THROTTLE VALVE MECHANISM TOR STEAM ENGINES.

APPLIOATION'IILBD MAR. 26, 1906. v

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UNITED STATES PATENT OFFICE. GUSTAV B. PETSOHE, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO SOUTHWABK FOUN- DRY AND MACHINE COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

THROTTLE-VALVE MECHANISM FOR STEAM-ENGINES.

To all whom it may concern:

Be it known that I, GUSTAV B. PETSOHE, a subject of the Emperor of Germany, residing in the city and county of Philadelphia, in the State of Pennsylvania, have invented a certain new and useful Improvement in Throttle-Valve Mechanism for Steam-Engines, of which the following is a true and exact description, reference being had to the accompanying drawings, which form a part thereof.

My invention relates to throttle valves employed for cutting off the supply of steam to the valve chests of steam engines and has for its object to provide eflicient mechanism for closing such valves with great certainty and speed when the engine exceeds a determined rate of speed and also to provide for a convenient reopening of such valves.

In a broad sense my present invention comprises some of the features described and claimed in my copending application for Letters Patent filed March 26, 1906 Serial Number 308001, my resent invention being directed to the specia features by which the closing and opening of such a valve can be efiected by steam power in connection with the emergency governor mechanism for setting the closing devices inoperation on the occurrence of the contemplated emergency.

The nature of my invention and the various features of construction will be best understood as described in connection with sectional views illustrating the valve forming a detail of construction and Fig. 7 is a side elevation showing my emergency valve in connection with a second hand actuated throttle valve situated below it.

A, is the casing of the throttle valve having a gridiron annular seat for the valve consisting of a central hub B with radial webs B the central hub being continued up Specification of Letters Patent.

Application filed March 26, 1906.

Patented March 10, 1908.

Serial No. 308,002.

C, is the circular gridiron valve pivoted on the pin B and resting on the webs 13*. At one edge this valve is formed with a tooth segment indicated at C D the cylinder connected with and preferably formed integral with the valve casing the inner end of this cylinder connecting through a port D with the live steam space of the casing.

E is a piston working in the cylinder and having attached to it the piston rod E, on which rod are formed teeth indicated at E in engagement with the toothed segment'C, on the edge of the valve. A head IE attached to the end of the rod is pivotally connected to the lever H pivoted at H and having. a handle H Under normal conditions the piston is held at the front end of the cylinder and the valve held 0 en by the engagement of a detent H on t e lever H, with a detent I, on a lever I, pivoted at I, and having a handle I said lever I, having an arm I, which projects into close proximity to the oscillating emergency governor to be described and so as to be actuated by said governor under proper conditions.

J, is a stud shaft secured to the casing on which is pivoted the oscillating governor K, preferably formed in the shape of a wheel as shown and having on one side a recess K in which lies an arm L pivoted at one end on a pin K in the rear of which the arm is cut away as indicated at L, to fpermit a certain Fig. 2).

M is a lever arm attached .to the hub of the governor wheel and by which it is actuated, being connected to some reciprocating or oscillating part of the engine as described in my before mentioned copending application. The rear end of the cylinder E is connected with a live steam space by a conduit F, F

in which issituated the plug cock casing F,:

and from which extends the branch pipe F entering into the casing on the lower s1de of the throttle valve. Under normal conditions the plug cock indicated at G, is closed, as shown 1n Fig. 5, and when opened it connectsthe pipe F, with both the pipes F and F as shown in Fig. 6. The cock G, is actuated through a shaft G, by a weighted lever G the weight of which normally keeps the valve or cook closed. v

Under normal conditions when valve is opened and the ports in the position shown in the various drawings when through some accident the speed of the engine exceeds a predetermined amount, the s ring N", yields to the centrifugal tendency of the governor arm L, permitting the end U, of this arm to project so that it strikes against the arm I, of the lever I, forcing this arm up and the other arm of the lever down releasing the latch lever H, whereupon the pressure of steam on the face of the piston E, at once causes it to move inward in the cylinder D, and through its toothed segment E to close the valve C.

Where the pressure involved is not great the valve can be opened and the parts set in normally latched position by drawing out- Ward the lever H, but this is best accomplished by opening the plug cock G, and admitting steam to the rear end of the cylinder '1), balancing the pressure on the piston E, or somewhat exceeding the pressure on the front of said piston, so that the piston will either automatically or through slight assistance from the hand lever H, be brought to open position.

In cases where the full pressure of live steam remains on the face of the valve C, as for instance, where the supplemental throttle valve 0, is situated below the casing A, .as

shown in Fig. 7, it is advisable to provide means for balancing the pressure on the valve C, and this I accomplish by the branch pipe F which, when the plug cock G, is opened, admits live steam below the valve C, and balances the pressure on both faces of this valve.

Having now described my invention, what I claim as new and desire to secure by Letters Patent is 1. A throttle valve for steam engines, comprising a valve casing, a valve for opening and closing the steam passage in the same, a steam cylinder open at one end to the live steam space, a steam pipe leading from the live steam space to the other end of the cylinder, a valve'for opening and closing said pipe, a piston working in said cylinder and connected to actuatethe valve, catch mechanism whereby the piston is normally held in position to hold the throttle valve open, and an emergency governor adapted to act as a releasing device forsaid catch mechanism.

2. A throttle valve for steam engines comprising a valve casing, a valve for opening and closing the steam passage in the same, a steam cylinder open at one end to the live steam space, a steam pipe leading from the live steam space to the other end of the cylinder, said pipe having a branch leading to the casing below the valve seat, a valve for opening and closing said. pipe, a piston working in said cylinder and connected to actuate the valve, catch mechanism whereby the piston is normally held in position to hold. the throttle valve open, and an emergency governor adapted to act as a releasing device for said catch mechanism.

3. A throttle valve for steam engines having in combination a valve casing with a seat for a slide valve, a slide valve working on said seat, a cylinder having one end in free connection with the live steam space, a piston working in said cylinder and connected to actuate the valve, a piston rod, catch mechanism acting to engage the piston rod and through it hold. the valve open and an emergency governor arranged to act as a catch releasing device.

4. A throttle valve for steam engines having in combination a valve easing with a seat for a slide valve, a slide valve working on said seat, a cylinder having one end in free connection with the live steam space, a steam pipe connecting the other end of the cylinder also with the live steam space, a valve for opening and closing said conduit, a piston working in said cylinder and connected to actuate the valve, a piston rod. catch mech anism acting to engage the piston rod and through it hold the valve open and an emergency governor arranged to act as a catch releasing device.

5. A throttle valve for steam engines having in combination a valve casing with a seat for a slide valve, a slide valve working on said seat, a cylinder having one end in free connection with the live steam space, a steam pipe connecting the other end of the cylinder also with the live steam space, said pipe having a branch extending into the casing below the slide valve, a valve for opening and closing said conduit, a piston working in said cylinder and connected to actuate the valve, a piston rod catch mechanism acting to engage the piston rod and through it hold the valve open and an emergency governor ar ranged to act as a catch releasing device.

GUSTAV B. PE'lSCllE.

Witnesses ARNOLD KATZ, D. STEWART.

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