US373478A - Lius tiers and alexander h - Google Patents

Description

(No Model.)

J. H. PENDLETON.

MEANS FOR RELIEVING DISCHARGE VALVES 0F DOUBLE ACTING PUMPS. No. 373,478. Patented Nov. 22, 1887.

' u PErcns. Pitch-Lithographer, Washington. 17. a

NITED STATES JOHN H. PENDLETON, OF BROOKLYN, ASSIGNOR TO HIMSELF, AND OORNE LIUS TIERS AND ALEXANDER H. TIERS, BOTH OF NEW YORK, N. Y.

MEANS FOR RELIEVING DISCHARGE-VALVES 0F DOUBLE-ACTING PUMPS.

SPECIFICATION forming part of Letters Patent No. 373,478, dated November 22, 1887.

Application filed December 15, 1585.

To aZZ whom, it may concern:

Be it known that I, John H. PENDLETON, of Brooklyn, in the county of Kings and State ofNew York, have invented a new and useful Improvement in Means for Relieving Discharge-Valves of Double-Acting Pumps, of which the following is a specification.

Myinvention relates to the discharge-valves of pumps which severally have a larger area exposed to pressure on the back than on the face, and which have connected with them diaphragms or pistons fitting small cylinders or chambers, and exposed on one side to the full pressure of liquid in the pump, and upon the other side provided with vents, whereby they are relieved of pressure. In the operation of a pumpprovided with such adischargevalve the liquid under pressure from the pumppiston acts upon both the face of the valve and upon the piston of diaphragm which is connected with the valve, and the combined pressure upon the face of the valve and upon the piston or diaphragm is amply suificient to overcome the pressure of the water-column upon the back of the valve. In my application for. United States Letters Patent, Serial No. 185,696, filed ofeven date herewith, I have shown and described a combination in which the vent-pipe leading from the piston or diaphragm chamber communicates with the atmosphere, or, in other words, with a vessel which is open to atmospheric pressure, and from this vessel any waterwhich may pass the piston or diaphragm as leakage is returned automatically to the suctionchest or supply of the pump to be again passed through the pump. WVhen the dischargevalves of doubleacting pumps have connected with them pistons or diaphragms for aiding their opening, as described, the vent-pipe from the piston or diaphragm chamber which is in one waterchamber of the pump may be connected direct-ly with the other chamber of the pump, and then the reciprocating movements of the piston will serve not only to produce pressure alternately upon the pistons or diaphragms which are connected with the valves, but will also alternately produce a suction through the vent-pipes upon the opposite side of such pistons or diaphragms; and this combination of discharge-valves and motor pistons or dia- Scrlal No. 185,695. (No model.)

phragms with the water-chambers of a doubleacting pump wherein pressure is alternately produced by the reciprocating movements of the piston forms the subject-matter of my present invention.

The accompanying drawing represents a longitudinal vertical section of the liquid cylinder, chambers, and valves ofa double-acting pump embodying my invention.

Adesignates the cylinder, andB the piston, by the movement of which the liquid in the opposite chambers O O is alternately put under pressure sufficiently to open the discharge valves b, whereby the chambers O O communicate with the discharge-chest E. The chambers G C also communicate by valves a with a suction-chest, D. The suction-valvcs a may be ofany suitable construction, and my invention in no way relates to them.

As here represented, the dischargevalves b are closed upon removable seats d,and,as usual in pump-valves of this class, the area exposed to pressure on the back or top of the valve is greater than that exposed to pressure on the face of the valve, by reason of the lapping which the valve necessarily has on its seat and around the openings therein. In order to balance the discharge-valves b and aid them in opening, I arrange in the two chambers G G motors, which are connected one with each valve, and are operated by the pressure of water alternately produced in the chambers O 0'. As here represented, each motor consists ofa movable diaphragm or piston, 6, connected by a stem, 6, with avalve, I), and working freely within a small cylinder or chamber, f. On the one side of the diaphragm or pis ton e the chamber f is entirely open, so that the diaphragm or piston on that side is exposed to pressure which may be created in the chamber 0 or O, and on the opposite side of the diaphragm or piston a vent-pipe, 9, leads from each chamber or cylinderfto the other water-chamber O or O. The vent'pipe g from the motor which is in the chamber 0 leads to the chamber 0, and the vent-pipe g from the motor which is in the chamber 0 leads to the chamber 0.

The cylinder f on that side ofthe diaphragm or piston which is vented, and which in this instance is the upper end, is closed by a cap pressure in the chamber 0, and will produce a vacuum or remove any pressure which may be in the chamber 0. The pressure acting upon the face of the diaphragm or piston e of the motor which is in the chamber 0 at the same time that its opposite side is relieved of pressure by the vent-pipe 9, leading to the chamber 0, will be sufficient to equal or slightly exceed the difference in pressure exerted on the back and face of the valve 12, and consequently the valve 1) will be opened by a pressure no greater than that necessary to force the liquid after the valve is opened.

I have shown springs sapplied to the pistons e for quickening the closing of the valves b.

i From the above description it will be understood that when the piston Bis moving toward the left, as indicated by the arrows, not only will the water in the chamber 0 exert a pressure upon the face of the piston e in that chamber to open the corresponding valve,b, but such pressure will be communicated from the chamber, through the vent-pipe g, to the back .of the piston e, which is in the chamber 0, and will thereby tend to hold the valve 1) corresponding to that piston tightly to its seat.

This same movement of the piston B will produce a suction in the chamber G, and such suction will be communicated through the vent-pipe leading from the chamber 0 to the piston-cylinder f, which is in the chamber G, and hence the piston e, which is in thechan1- her 0, will not only be moved by the pressure in the chamber 0, but such movement will be aided by the suction in the chamber O,which is communicated through the vent-pipe g.

I do not claim herein the combination, with a pump-piston, a chamber wherein the fluid is put under pressure by the movement of the piston, and a discharge-chest, of the valve b in the discharge-chest, for controlling the discharge from said chamber, and having a stem,

e, projecting inward through the valve-seat,

a diaphragm, e, directly connected with the inner end of the stem, the supplemental cham ber f, containing-the diaphragm, opening at one end directly into the chamber, wherein fluid is put under pressure by the movement of the piston and at its oppositeend closed and provided with a vent, and a sleeve extending inward from the valve-seat and connecting the closed end or top of the chamber f with the valve-seat, as such a combination of parts is claimed in my pending application, Serial No. 185,696, filed December 15, 1885.

What I claim as my invention, and desire to secure by Letters Patent, is-

The combination, with the two water-chambers, of a double-acting pump wherein pressure is alternately produced by the reciprocating movement of the piston, and with the discharge-valves leading therefrom, of diaphragms connected with the valves, supplemental chambers f, arranged in the two Waterchambersand containing the diaphragms, and

' receiving on one side.ot' the diaphragms the full pressure ofliquid,a-nd a vent-pipe, whereby the supplemental chamber of the diaphragm in each water-chamber is connected with the other water chamber, substantially as herein described.

J. H. PEN DLETON.

Witnesses:

, FREDK. HAYNES,

HENRY MCBRIDE.

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