US596624A - scott - Google Patents
scott Download PDFInfo
- Publication number
- US596624A US596624A US596624DA US596624A US 596624 A US596624 A US 596624A US 596624D A US596624D A US 596624DA US 596624 A US596624 A US 596624A
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- US
- United States
- Prior art keywords
- valve
- steam
- scott
- engine
- web
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000010276 construction Methods 0.000 description 4
- 230000001627 detrimental Effects 0.000 description 2
- 238000009432 framing Methods 0.000 description 2
- 230000003137 locomotive Effects 0.000 description 2
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K39/00—Devices for relieving the pressure on the sealing faces
- F16K39/02—Devices for relieving the pressure on the sealing faces for lift valves
- F16K39/022—Devices for relieving the pressure on the sealing faces for lift valves using balancing surfaces
Definitions
- e/AQWWM a front view of the improved valve.
- Figure l is Fig. 2 is a longitudinal section.
- Fig. 3 is a sectional view showing the valve in position with the steam inlet and outlet and the passages to the piston-cylinder;
- Fig. a is a side elevatio'n of a steam-engine with the valve applied there- 'to, showing a method of operating the valve from an eccentric on the crank-shaft of the engine.
- a and B are the two disks, connected together by theweb O, of a width equal to the diameters of the disks, and D is a stem. All these parts are preferably cast in one piece.
- the disks and the edges of the web are fitted with packing to make a steam-tight joint;
- In the disk A is a central opening A, through which steam enters, and this opening connects with a recess or chamber 0, having the same area as the opening and formed in and open to one side of the web, as shown.
- E, Fig. 3 is a pipe which may be used as the steam-pipe and fits into the end of the valve case or cylinder in which the valve is housed and opposite to the hole or opening A.
- G is another pipe, which may be used as the exhaust, or vice versa, as may be desired.
- steam will enter at A, pass into the chamber 0, and thence to one side of the web 0, exhausting at the back of the web, as indicated by the arrows, Fig. 3.
- the valve is operated by a well-known linkmotion connected with an eccentric on the crank-shaft H. (See Fig. 4.)
- This link-motion also provides for reversing, which can be effected while the engine is running and without shutting oif steam.
- valve I By the use of this novel construction of valve I may increase the port area without increasing the work on the eccentric, and the whole weight of the valve is taken off the eccentric. It is possible to reverse the engine with one eccentric, and the reversing can be effected under full head of steam without the aid of steam reversing-gear, no matter how large the main engine may be. The whole of the back pressure on the back of valve of the old D type, so detrimental to power of engine, is
- valve is almost balanced. It will keep itself steam-tight without producing any unnecessary amount of friction, and the ports of cylinder can be made any size compatible with size of cylinder without any detriment to the valve, thereby increasing the efficiency of the steam in a low-pressure cylinder, (on a triple engine,) and it can be worked at any grade of expansion.
- the valve can be examined at sea in about one-quarter the time of an ordinary D-valve, as there are no doors to sling in order to get at it.
- the bore can be increased to the full area taken up by the present valves and boxes.
- a cut-01f valve for steam-engines consistin g of two disks,'one perforated and connected by a web of a width equal to the diameters of the disks, such web containing a recess or chamber of an area equal to the opening of the disk, and a valve case or cylinder, as and for the purpose set forth.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Description
(No Model.) 2 sheets-4116615 1.
T. W. SCOTT. VALVE FOR STEAM ENGINES.
No. 596,624 Patented Jan. 4,1898.
a a w NH NE (W1 a ll H B m MN m a? A a (No Model.) 2 Shets-Sheet 2.
T. W. SCOTT. VALVE FOR STEAM ENGINES.
No. 596,624. Patented Jan. 4, 1898.
e/AQWWM a front view of the improved valve.
llnrrnn STATES PATENT OFFICE.
I THOMAS W. SCOTT, OF LONDON, ENGLAND.
VALVE FOR STEAM-ENGINES.
SPECIFICATION forming part of Letters Patent No. 596,624, dated January 4, 1898.
Application filed September 10,1897. Serial No. 651,215. (No model.)
slide valves will be overcome; and the invention consists in a novel construction of rotary or rocking valve.
In the accompanying drawings, Figure l is Fig. 2 is a longitudinal section. Fig. 3 is a sectional view showing the valve in position with the steam inlet and outlet and the passages to the piston-cylinder; and Fig. a is a side elevatio'n of a steam-engine with the valve applied there- 'to, showing a method of operating the valve from an eccentric on the crank-shaft of the engine.
A and B are the two disks, connected together by theweb O, of a width equal to the diameters of the disks, and D is a stem. All these parts are preferably cast in one piece. The disks and the edges of the web are fitted with packing to make a steam-tight joint; In the disk A is a central opening A, through which steam enters, and this opening connects with a recess or chamber 0, having the same area as the opening and formed in and open to one side of the web, as shown.
E, Fig. 3, is a pipe which may be used as the steam-pipe and fits into the end of the valve case or cylinder in which the valve is housed and opposite to the hole or opening A. G is another pipe, which may be used as the exhaust, or vice versa, as may be desired. In the arrangement shown steam will enter at A, pass into the chamber 0, and thence to one side of the web 0, exhausting at the back of the web, as indicated by the arrows, Fig. 3.
The valve is operated by a well-known linkmotion connected with an eccentric on the crank-shaft H. (See Fig. 4.) This link-motion also provides for reversing, which can be effected while the engine is running and without shutting oif steam.
By the use of this novel construction of valve I may increase the port area without increasing the work on the eccentric, and the whole weight of the valve is taken off the eccentric. It is possible to reverse the engine with one eccentric, and the reversing can be effected under full head of steam without the aid of steam reversing-gear, no matter how large the main engine may be. The whole of the back pressure on the back of valve of the old D type, so detrimental to power of engine, is
overcome and the valve is almost balanced. It will keep itself steam-tight without producing any unnecessary amount of friction, and the ports of cylinder can be made any size compatible with size of cylinder without any detriment to the valve, thereby increasing the efficiency of the steam in a low-pressure cylinder, (on a triple engine,) and it can be worked at any grade of expansion.
The valve can be examined at sea in about one-quarter the time of an ordinary D-valve, as there are no doors to sling in order to get at it.
For locomotive work, where the cylinders are between the side framing, the bore can be increased to the full area taken up by the present valves and boxes.
What I claim is- A cut-01f valve for steam-engines, consistin g of two disks,'one perforated and connected by a web of a width equal to the diameters of the disks, such web containing a recess or chamber of an area equal to the opening of the disk, and a valve case or cylinder, as and for the purpose set forth.
THOMAS W. SCOTT.
Witnesses:
\ H. K. WHITE,
ALFRED V. BISHOP.
Publications (1)
Publication Number | Publication Date |
---|---|
US596624A true US596624A (en) | 1898-01-04 |
Family
ID=2665270
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US596624D Expired - Lifetime US596624A (en) | scott |
Country Status (1)
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US (1) | US596624A (en) |
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- US US596624D patent/US596624A/en not_active Expired - Lifetime
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