US1361825A - Relief-valve for pumps - Google Patents

Description

B. E CANNON.

RELIEF VALVE FOR PUMPS.

APPLICATION FILED MAR. 31. 1916.

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gwuevl/toz 6/ BERNARD E. CANNON, OF LOCUST GAP, PENNSYLVANIA.

RELIEF-VALVE FOR PUMPS.

Specification of Letters Patent.

Patented Dec. 14, 1920.

Application filed March 31, 1916. Serial No. 87,901.

T 0 all whom it may concern:

Be it known that I BERNARD E. CANNON, a citizen of the United States, and a resident of Locust Gap, in the county of Northumberland and State of Pennsylvania, have invented certain new and useful Improvements in Relief-Valves for Pumps, of which the following is a specification.

This invention relates to an improvement in relief valves for pumps.

The object of the invention is the pr0- duction of means whereby the flow through the suction pipe of a pump is not stopped with the closure of the suction valves of the pump.

Heretofore suction air chambers have been used to maintain an interrupted flow in the suction pipe of a pump. With said air chambers shocks are produced upon the reversals of the stroke of the pump, because the air in said suction air chambers is soon absorbed by the fluid pumped, and the flow on the suction side is intermittently stopped without resilient means to meet the inflowing column of water when the suction valves are closed.

The present invention enables the practically uninterrupted flow of fluid in the suction pipe of the pump. Its organization comprises a chamber with a valve therein, which covers a port connecting with the suction pipe. The said valve opens when the suction valves close and thereby allows the continuous flow of the suction column.

In the accompanying drawings Figure 1 shows the water end of the pump with the invention attached thereto; Fig. 2 represents a vertical axial section of the invention and Fig. 3 is in part a top plan view and in part a section as on the line 3, 3 of Fig. 2.

The water cylinders of a pump are indicated at 20 with the suction chambers 21 having suction valves not shown, outlet chambers 22 with discharge valves not shown and the discharge pipe 23. Reciprocating pistons not shown are provided for the cylinders 20. A suction pipe 25 is connected to the inlets of the suction chambers 21 and has an extended portion 25 which extends beyond the said suction chambers. An elbow 28 at one end of the suction pipe 25 supports the overflow chamber 30, which latter has formed therewith the inlet port 31 and the outlet port 32. A bonnet 33 is bolted to the top of the chamber 30. Overflow piping 34 extends from the outlet port 32. The piping 34 preferably leads to a reservoir not shown from which the suction pipe 25 draws its charge, or it may lead to a tank placed at a height so that the charge will flow therein by reason of the momentum given to the charge when it enters the chamber 30. A valve seat 35, with the hub 36 and arms 37 is secured to the chamber 30, and carries the valve spindle 39 having the head 40. A metallic cap 41 with the upper sleeve 42 and the lower sleeve 43 en circles the valve spindle 39.

A check valve 45 preferably of rubber is normally located upon the valve seat 35, encircles the sleeve 43, and has bearing thereon the cap 41. A spring 46 encircles the spindle 39 and sleeve 42 and bears between the cap 41 and the head 40 of the valve spindle 39. I It will be noted that the chamber 30 with its valve 45 is beyond the suction chambers 21, so that the water in the chamber 30 will not work against the head in the discharge pipe 23.

When the strokes of the piston in the water cylinders open the suction valves of the pump, a partial vacuum is produced in the suction pipe 25 in the usual way, and the fluid column flows therein in the direction of the arrow A. When the suction valves close the column of water in the said suction pipe 25 still continues to flow in the same direction. During the short interval of time that the suction valves are closed. the inflowing fluid raises the valve 45, enters the chamber 30 and is eventually discharged through the piping 34. As soon as the suction valves close, the valve 45 is automatically opened, and the column of water in the chamber 30 seals the said valve 45, to preserve the vacuum in the suction pipe 25. The sleeve 43 prevents wear between the valve 45 and the valve spindle 39.

It will be noted that a continuous flow of water is drawn into the suction pipe 25 while the suction valves in suction chambers 21 are operating. The water that is not forced through the ports of the suction valves of the chambers 21 flows into the overflow chamber 30. By reason of this overflow and complete avoidance of interruption of the flow of water in the pipe 25 water hammer is avoided and great speed of the pump pistons is enabled to be ob tained.

Having described my invention what I desire to secure by Letters Patent and claim is:

l. The combination with a reciprocating piston pump of a suction conduit connected to the suction end of the pump, a chamber for the overflow of the suction conduit having an inlet and an outlet the inlet of the said chamber connected to the said suction conduit and a valve in said chamber automatically opening with the flow in the suction conduit when the pump tends to interrupt such flow.

The combination With a reciprocating piston nump of a suction pipe connected to the inlet opening of the pump and having 15 an extendedportion beyond said inlet opening, an overflow chamber having an inlet port and an outlet port, said inlet port connected to said extended portion of the suction'pipe and a check valve in the overflow 20 chamber for the inlet port thereof.

Signed at Locust Gap in the county of N orthumberland and State of Pennsylvania

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