US859152A

US859152A - Valve.

Info

Publication number: US859152A
Application number: US34502506A
Authority: US
Inventors: Harold P Tippett
Original assignee: Individual
Current assignee: Individual
Priority date: 1906-11-26
Filing date: 1906-11-26
Publication date: 1907-07-02
Anticipated expiration: 1924-07-02

Description

PATENTED JULY 2, 1907. H. P. TIPPETT.

VALVE. APPLIOATION mm) 11017.26, 1906.

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HAROLD P. TIPPETT, OF COLUMBUS, OHIO.

VALVE.

Specification of Letters Patent.

Patented July 2, 1907.

Application filed November 26,1906. Serial No. 345,025.

To all whom it may concern:

Be it known that I, IIAROLD P. TIPPETT, a citizen of the United States, residing at olumbus, in the county of Franklin and State of Ohio, have invented certain new and useful Improvements in Valves, of which the following is a specification.

My invention relates to valves and particularly to a valve for controlling steam under pressure, the initial movement of which is controlled from the exterior of the valve casing, but the final movement of which is completed by thepressure of the steam which said valve controls. p

A further object of the invention is the provision of a valve of this character constructed to open very rapidly for the purpose hereinafter set forth.

Further objects and advantages of the invention will be set forth in the detailed description which now follows.

In the accompanying drawing: Figure 1 is a detail view of a portion of a furnace illustrating the application of my improved valve, and, Fig. 2 is a detail sectional view of said valve.

Like numerals designate corresponding parts in both of the figures of the drawing.

Referring to the drawing, the numeral 5 designates a furnace. A chute G conducts coal to this furnace from any suitable source of supply and a steam blast for distributing this coal is conducted through a pipe 7 in the usual and well known manner. The valve forming the subject matter of this invention is designed to control this blast and is constructed to open so quickly that the full force of the blast is received instantaneously at the nozzles.

It will readily be understood that if these valves opened slowly and the blast reached the pile of coal gradually, while this blast would start the coal moving, it would not carry it to the rear portion of the furnace, but said coal would bank up at the forward portion'of the furnace. A quick opening of this valve is therefore a very important element in the successful operation of a device of this character.

The devices for imparting movement to this valve, do not form any part of the present invention, but a portion of these devices have been illustrated in Fig. 1 of the drawing to make clear the operation and application of the valve. In this figiu'e the numeral 8 designates a rotative disk to which power may be applied from any suitable motor. This disk carries a finger 9 which is adapted to engage with the beveled end 10 of a bell crank lever 11, said lever being pivoted as at 12. A. short arm 13 of this lever is pivoted as at 14 to the valve stem 15 of the valve which forms the subject matter of the present invention. This valve comprises a casing 16 which is divided into a central chamber 17 and a somewhat smaller chamber 18. The

branch 19 of the steam supply pipe is threaded into the casing at 20 and admits steam to the chamber 17 through a port 20 Mounted for reciprocatory movement in this chamber is a valve, which comprises a stem 21, a piston 22 which is carried by the upper end of this stem and fits snugly within the chamber 17 and a somewhat smaller piston 23 which is carried upon the lower end of the stem and fits snugly within the chamber 18. The pipe 7 is threaded into the valve casing at 24. A comparatively minute exhaust port 25 leads from the upper portion of the chamber 17 to the exterior of the valve casing. Mounted upon the lower end of the valve stem 15 is a valve 26 which is normally held upon its seat by a spring 27. This valve stem passes through a suitable stufiing box 28 of the usual and well known construction and which requires no further description. Steam passes to a chamber 29 in which the valve 26 is located, through a by-pass 30.

The operation of the device is as follows: Rotation having been imparted to the disk 8, the trip finger 9 is carried bodily around. When the beveled end of this trip finger contacts with the beveled end 10 of the bell crank lever 11, said bell crank lever is rocked upon its pivot 12 to lift the valve stem 15. Thisresults in lifting the valve 26 from its seat. Since the area of the underside of the piston 22 exceeds the area of the upper face of the piston 23, it follows that the pressure in the chamber 17 will when the valve 26 is seated, hold the main valve in the position illustrated in Fig. 2, at which time communication between said chamber and the pipe 7 is closed by the piston 23. When the valve 26 is lifted from its scat against the tension of the spring 27 in the course of the rotation of the disk 8, steam flows through the bypass 30 and chamber 29 to the upper portion of the chamber 17. The pressure upon the upper face of the piston 22 combined with the pressure upon the upper surface of the piston 23 is sufficient to overcome the pressure upon the underside of the piston 22 and causes the main valve to move downward with a very quick movement. This downward movement of the main valve, brings the piston 23 below a port 31 and establishes communication between the chamber 17 and the pipe 7.

It will readily be understood that the duration of the blast may be determined by the adjustment of the tripping finger 9. If this finger be adjusted to such position that only the extreme point thereof, contacts with the beveled end of the bell crank lever 11, the blast will be of very short duration, while if this finger be adjusted to such position that practically the whole of the beveled surface-of the lower end thereof, contacts with the beveled upper end of the bell crank lever 11, the blast will be of longer duration. This fluid controlling valve is constructed to open so quickly that the full force of the blast is received instantaneously at the nozzles, for the main valve moves downward with great rapidity when steam is admitted upon the top of the piston 22.

From the foregoing description, it will be seen that simple and efficient means are herein provided for accomplishing the objects of the invention, but while the elements shown and described are well adapted to serve the purposes for which they are intended, it is to be understood that the invention is not limited to the precise construction set forth, but includes within its purview such changes as may be made within the scope of the appended claims.

What I claim, is:

In a valve for controlling fluid under pressure, the combination with a casing divided into a large chamber and a smaller chamber, of a piston valve comprising a stem, a piston of equal diameter with and traveling in the large chamber, said piston being carried by said stem, :1 second piston also carried by said stem of equal diameter with and traveling in the smaller chamber, said casing having an inlet port adapted to admit fluid under pressure to the larger chamber between said pistons and having a discharge port adapted to deliver fluid under pressure from the smaller chamber, a cap for the valve casing, a chamber formed in said cap, a port establishing communication between the last named chamber and the upper portion of the large chamber of the Valve, a spring controlled valve adapted to be actuated from the exterior of the casing which normally closes said port, an exhaust port which establishes communication between the upper portion of the large chamber of the valve casing and the atmosphere, and a bypass establishing communication between the chamber of the cap and the inlet port of the main casing.

In testimony whereof I affix my signature in presence of two witnesses.

HAROLD P. TIPPETT.

Witnesses FRANK G. CAMPBELL, L. CARL STOUGIITON.