US 861675 A
Description (OCR text may contain errors)
No. 861,675. PATENTED JULY 30, 1907-- D. E. ROSSER.
PUMP STOP. APPLICATION FILED 123.17, 1906.
THE NORRIS PETERS co, wasnmmon, n. c.
DAVID E. ROSSER, OF SGRANTON, PENNSYLVANIA.
Specification of Letters Patent.
Patented July 30, 1907.
Application filed February 17, 1906. Serial No. 301,615.
To all whom 'it may concern:
Be it known that 1, DAVID E. RossER, a citizen of the United States, and a resident of Scranton, in the county of Lackawanna and State of Pennsylvania, have invented certain new and useful Improvements in Pump-Stops, of which the following is a specification.
This invention relates to pump stops.
When pumps are used in mines, the acids in the mine water attack the metal of the suction and the discharge pipe and cause these pipes to break. If the suction pipe breaks, the pump engine races, and, when *a direct acting pumping engine is employed, as it is in most mines, the pump cylinders have their heads knocked out. If, on the other hand, the discharge column breaks, considerable damage is likely to be done.
It is an object of my invention to construct a device connected to the discharge, the intake and the steam valve of the pump, so that when the pressure in discharge decreases or the suction in the intake stops, the steam or other supply of energy to the pump will be shut off.
Other and further objects will appear in the following description and will be more particularly pointed out in the appended claims:
In the drawings: Figure 1 is a sectional view of one embodiment of my invention, with the parts in the positions taken when the suction and discharge pressure are acting thereon; Fig. 2 is a like view with the suction broken; Fig. 3 is a like view with the discharge broken; Fig. 4 is a detail view showing the relief valve uncoupled from its stem; and Fig. 5 is a detail view of another embodiment of my invention, the pressure piston and cylinder of Figs. 1 to 4, being replaced by a diaphragm. Fig. 6 is a detail view showing the means for permitting a very slow action of the pumping engine.
Referring more particularly to the drawings, 1 indicates the valve casing which is connected to the steam pipe 2, containing a globe valve 3 by which the steam is controlled, the stop forming the subject of my invention being too sensitive for this purpose.
The valve casing 1 is provided with a double seat 4 with which cooperates a double valve 5 carrying a valve stem 6. The valve has a tendency to move to its seat, this being caused by any suitable means, that shown being in the form of a weight 7 adjustable on a lever 8 which is pivoted to a frame 9 at 10 and extends through a slot 11 in the valve stem 6. The lever 8 serves as a means for opening the stop valve, the latter being maintained in its open position for a short time during the starting of the pump by means of a latch 12 which is pivoted at 13 to the frame 9.
Mounted on the frame 8 is a suction controlled mechanism in the form of an air tight cylinder 14 inwhich works a plunger or piston 15 which is secured directly to the valve stem. Leading from the upper wall of the cylinder is a pipe 16 which is connected to the suction of the pump.
After the stop-steam-valve has been opened through the medium of the lever 8 and the pump has begun to operate, the suction will maintain the piston at the upper end of the cylinder 14, and, when the suction stops, due to the breaking of the pipe or the like, the piston will descend under the action of the means that closes the stop valve.
To permit the valve to close when the discharge breaks, there is provided means which breaks the vacuum or partial vacuum in the cylinder 14, said means being controlled by the discharge pressure. This means employs a relief valve 17 movable in an opening in the top of the suction cylinder and held to its seat 18 or closed by a spiral spring 19. The valve is provided with a longitudinal bore 20 in which works a stem 21 provided with an annular groove 22 and forming part of a mechanism controlled by the discharge pressure in a manner to be hereinafter described. This annular groove 22 is adapted to receive the end ofa sliding bolt 23 carried by the valve 17 and held in the groove by a spring 24 to form a detachable connection between the pressure controlled mechanism and the relief valve 17.
Secured to the stem 21 is a piston 25 which works in a cylinder 26 supported upon a frame 27 on the cylinder 14. This piston has a tendency to move in a direction to open the valve 17, this action being caused by a spring 28 which has greater strength than the spring 19 which tends to hold the valve 17 to its seat. The spring 28 is located in the upper end of the cylinder, its lower end abutting the front face of the piston 25, and its upper end abutting a plate 29 which is engaged by an adjusting screw 30 to adjust the tension of the spring 28.
The pipe 37 leads from the discharge pipe of the pump to the under face of the piston 25, whereby the discharge pressure maintains the piston in an elevated position and the valve 17 closed while the pump is discharging. Should the discharge break, the spring 28 will force the piston downwardly and open the valve 17, thereby destroying the effect of the suction on the piston 15 and permitting the weight 7 to close the stop steam-valve 5. Before the stop steam-valve is opened, the bolt 23 is withdrawn by hand from groove 22 and the valve 17 closes under the action of the spring 19. When the valve 5 is again opened by lever 8 and the discharge pressure of the pump acts on the piston 25, the stem 21 moves upwardly until the groove 22 is opposite the bolt 23, at which time, the bolt enters the groove 22 under the action of its spring 24, and the discharge pressure piston is automatically coupled to the vacuum relief valve 17.
To prevent the water from the discharge of the pump entering the pressure cylinder and destroying the working parts, therein, I provide means for supplying oil to the cylinder, the oil thereby receiving the discharge pressure and transmitting it to the piston. This means comprises a vertical pipe 31 which is connected to the discharge pressure pipe 19, and extends upwardly to a point above a bleeder pipe 32 which extends from the side of the cylinder 26. This oil reservoir or pipe 31 is closed by a cap 33 and during the filling of the cylinder 26 avalve 34 is closed. The intake or suction pipe contains a globe valve 35 by which the suction may be cut off from piston 15. j
indicates an adjustable screw plug mounted in an opening in .the lower member of the valve and provided with a longitudinal groove which may be positioned to admit a very small quantity of steam through the valve and permit the pumping engine to work slowly.
In the embodiment shown in Fig. 5, the pressure piston and cylinder are replaced by a casing 36 having a diaphragm 38 therein, to which the stem 21 is connected, the discharge pressure pipe 37 being connected to the casing on one side of the diaphragm, and a spring 39 being connected to the other side of the diaphragm. The operation of this embodiment is the same as the one previously described.
Having now described my invention, What I claim is:
1. The combination of means tending to'shut off the supply of energy to a pump, a mechanism adapted to be connected to the intake and to the exhaust of a pump to hold the supply on and to release the shut off means when either the suction or'the discharge of the pump breaks.
2. In a pump stop, a steam valve, a pressure controlled mechanism for connection with the discharge of thepump, a suction controlled mechanism for connection with the intake of the pump, the two mechanisms being connected to the steam valve in such a manner as to'close the valve when either the suction or the discharge of the pump breaks.
3. The combination with the stop valve, of a pressure controlled mechanism, and a suction controlled mechanism, each constructed to effect the closing of the valve.
4. The combination with a valve, of a suction controlled mechanism to hold the valve in one direction, means tending to move the valve in the other direction, and a pressure controlled mechanism acting to break the suction and permit the valve to move.
5. The combination with a valve, of a suction controlled mechanism controlling the valve, a relief valve in the suction controlled mechanism arranged to break the suction, and a pressure controlled mechanism controlling the relief valve.
G. The combination with a valve, of a suction controlled mechanism controlling the valve, and a pressure controlled relief valve controlling the suction controlled mechanism.
7. The combination with a valve, of a suction controlled mechanism controlling the valve, a relief valve for the suction controlled mechanism, and a pressure controlled mechanism'having detachable connection with the relief valve.
8. The combination with a valve, of a suction controlled mechanism controlling the valve, a relief valve for the suction controlled mechanism, means acting on the valve to maintain it closed, a pressure controlled mechanism having detachable connection with the relief valve and tending to maintain the valve closed, when pressure is applied thereto, and means acting in opposition to the closing means to open the relief valve When pressure stops.
9. The combination With a valve, of a suction controlled mechanism and a pressure controlled mechanism, one of which is connected to the valve, a relief valve for the mechanism connected to the valve, and connection between the other of said mechanisms and the relief valve for operatingthe relief valve.
10. The combination with means for shutting off the supply of energy to a pump, of a pressure controlled mechanism, and a suction controlled mechanism, each constructed to effect the operation of the means for shutting off the energy.
The foregoing specification signed at Washington D. C. this 2nd day of February, 1906.
In presence of two witnesses- EDWIN S. CLARKSON, H. H. SIMMs.