US 655741 A
Description (OCR text may contain errors)
No. 655,74l. Patented Aug. |4,"|9oo J. c. scorn.
(Application filed Sept. 18, 1898.) (N0 Model.) 2 Sheets-Sheet l,
EZUCIZi OTi Jofin/ (7. b11056, Q
NITED States PATENT Orrrcn.
JOHN C. SCOTT, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR, BY MESNE ASSIGNMENTS, TO CLARKE MERCHANT AND GEORGE S. GRAHAM, OF
SPECIFICATION forming part of Letters Patent No. 655,741, dated August 14, 1900. Application filed September 18, 1898- Serial No. 690,878. (lilo model.)
To all whom it may concern:
Be it known that I, JOHN GSOOTT, a citizen of the United States, residingin Philadelphia, Pennsylvania, have invented certain Improvements in Valves, of which the following is a specification.
My invention relates to certain improvements in valves for use in dry-pipe fireextinguisher systems for controlling the water-supply.
The objects of my invention are to so constructthe valve that it will open to the full extent and will not leak when closed and to provide means to prevent the valve from closing completely onto the seat when once opened by the pressure of water.
In the accompanying drawings, Figure l is a side view of my improved valve. Fig. 2 is a sectional view showing the valve-disk closed. Fig. 3 is a view showing an arm in such a position as to prevent the valve-disk closing, and Fig. 4 is an end View of the valve.
A is the casing of the valve, having a cap A and a seat-support a, angularly arranged with respect to the horizontal axis of the said casing. Adapted to this seat-support is a ring B, which forms the valve-seat. The periphery of this ringis threaded and is adapted to the threaded opening in the support a. In the face of the seat-ring B is an annular channel 1), formed by the two annular ribs 1) and b and communicating with this channel is a drip-passage c in the casing, connected to an automatic drip-check valve 0 of the usual construction.
Adapted to the seat B is a valve-disk D, hung to an arm D, pivoted at d to the casing. The valve-disk is closed on the seat bya stem E, having a screw-thread thereon. The stem E is adapted to a bracket F, secured to the valve-casing, and is prevented from turning by a key adapted to a longitudinal slot there in. On the bracket is a hand-wheel 6, having a thread adapted to the thread of the stem, so that on turning the wheel in one direction it will back ofi the stem from the valve-disk and will thus allow the valve to open freely against pressure from the under side. When the screw is turned in the opposite direction, it will force the valve-disk onto the ribs U11 forming the valve-seat B, so that the disk will rest on two annular seats, with a space open to the atmosphere between them. Thus should any water leak past one of the ribs it will enter the space I) and will be entrapped therein and will eventually pass out through the drip-check valve 0.
Journaled in the casing is a rock-shaft G, having an arm g within the casing, which is adapted to rest against the under side of the valve-disk D, and secured to the shaft on the outside of the casing is an arm g, and at tached to this arm and to a pin on the casing is a spring 9 which tends to turn the shaft and force the arm 9 against the inner edge of the seat-ring B. This device prevents the complete closing of the valve-disk after it has once been opened, as the arm 9 will be forced by its spring into such position that its end will extend beyond the valve-seat as soon as the valve-disk leaves the seat, so that when the disk closes it is kept off its seat by the projecting end of the arm g; but by simply moving the arm g on the outside back by hand the arm 9 is moved away from the seat and the valve can be closed.
The casing has a plug a directly in line With the opening for the passage of the screw, so that the valve-seat can be readily bored and ground.
The cap A can be removed, so that access may be had to all portions of the valve, and the parts can be readily detached for repairs, if necessary.
The construction of valve illustrated is especially adapted to what is termed a drypipe fire-extinguisher system. In this system the pipes are arranged throughout a building to supply sprinklers with water and are fed from a main generally entering the building at the basement. It is found essential to draw off the water from the system within the building, so that the water will not freeze within the pipes during the winter season. By placing a valve such as illustrated in the drawings in the supply-pipe I can so arrange it that it will open automatically and remain open in the event of one of the sprinkler-heads being melted off by the heat of a fire.
In order to set the valve, the disk is first closed by the screw-stem and held in the closed position. \Vater is then allowed to escape from the pipes throughout the building, air taking its place. The air-inlet is then closed, so that a body of air is entrapped Within the pipes, a short column of water remaining above the valve, so as to keep a water-seat above the valve-disk. The screwstem is then backed off, the pressure of air and water being sufficient to prevent the opening of the valve, owing to the different diameters of the two exposed surfaces of the valve-disk to keep the valve closed. The lever is arranged against the under side of the valve for the purpose described above. As soon as one of the sprinkler-heads becomes detached the air will escape from the pipes and through this detached sprinkler-head, and thus relieve the pressure upon the valvedisk, which will automatically open, and the water will flow through the system. The lever g will assume such position as to prevent the valve-disk from completely closiu g, thus insuring the circulation of Water through the system until it is checked by turning the hand-wheel.
I claim as my invention- 1. The combination of a valve-casin g, a seat therefor, pivoted valve-disk, means for clos ing said disk, an arm pivoted to the casing and adapted to rest against the under side of the valve to hold it open, and means for op erating said arm from the outside of the cas ing, substantially as described.
2. The combination of a valve-casing havinga seat, with a valve adapted to said seat, means for closing said valve, a shaft adapted to the casing having an arm resting against the under side of the valve, an arm secured to the shaft on the outside of the casing, a spring connecting said arm with the casing so that when the valve is opened the arm within the casing will be brought to such position as to prevent the valve from closing upon its seat, substantially as described.
In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.
JOHN G. SCOTT.
WILL. A. BARR, Jos. H. KLEIN.