US657671A - Pump-valve-actuating mechanism. - Google Patents

Description

Patented sept. n, |900.

Inventor. ZZ.,

,torne-y.

am wenns no. wom uw Asnmmnm n G. B. PETSCHE. PUMP VALVE ACTUATING MECHANISM.

(Application filed July 31, 1897.)

(No Mogel.)

.NNEW

Witnesses. 76%71`m7i Wai UNITED STATES PATENT OEEICE.

GUSTAV BERNHARD PETSOHE, OF PHILADELPHIA, PENNSYLVANIA, AS-

SIGNOR TO THE SOUTHWARK FOUNDRY AND MACHINE COMPANY,

OF SAME PLACE.

PUIVI P-VALVE-ACTUATING MECHANISM.

SPECIFICATION forming part of Letters Patent No. 657 ,671, dated September 11, 1900.

Application Aiea my s1. uit?.

`Serial No. 645,630. (No model.)

To rr/ZZ whom, t may concern.-

Be it known that I, GUsTAv BERNHARD PETSCHE, a subject of the Emperor of Germany, residing in the city and county of Philadel phia, in the State of Pennsylvania, have invented a certain new and useful Improvement in Punip-Valve-Actuating Mechanism, of which the following isa true and exactdescription,l reference being had to the accompan ying drawings, which form a part thereof.

My invention relates to the construction and mode of operation of mechanism for actuating the delivery and suction valves of pu m ps,particularly of pum ps used for liquids.

In another application filed by me .Iuly 3l, 1897, Serial No. 646,629, I have described and claimed a new method and apparatus for actuating liquid pump-valves, in which I act upon the valves with intermittent yielding pressure applied at or slightly before the normal point in the motion of the plunger at which the valves should open or close and so proportioned with reference to the resistance to the motion of the valve developed by inequalities of pressure that the valve will move not only when the pressure upon its inner and outer faces is substantially balanced, but move them with great energy, thus insuring that the valves shall open or close at the critical moment and without imposing dangerous strains upon the valve-actuating mechanism. My said invention is especially designed with reference to the use of sliding laterally-moving valves, as by their use the obstruction to the passage of water through the valve which is met with in the ordinary type of clack-valve is avoided, with great gain to the efliciency of the pump.

My present invention embodies the essential features forming the subject-matter of my separate application mentioned above, but has especially for its object to provide for the operation of the valves through their lap by means of the duid displaced by the plunger during that portion of its movement when the delivery-valve is closed and moving over its lap either in a direction to close or a direction to open, thus enabling the valves to open and close slightly after the How of uid from the pump-chamber begins and slightly before it ceases, which in the case of the use of slot-ted valves avoids one source of possible diiiculty and in the case of any valve will be recognized as desirable, since it entirely obviates the risk of a return flow through the valve while in the act 0f closing.

The nature of in'y improvements will be best understood as described in connection with t-he drawings, in which they are illustrated, and in which-'- Figure l is an elevation, partly in section, of a pump provided with my improvements. Fig. 2 is a side elevation of the same apparatus, showing the valve-actuating cylinder in section. Figs. 3 and 4 are sectional views of the pilot-valves. Fig. 5 is a diagram illustrating the action of the valve with respect to the flow of water and the motion of the valves; and Fig. 6 is asectional elevation of a valve-actuating cylinder of the type which I preferto employ and which although embodying several features of importance invented by me is not herein claimed, as it forms in some features the subject-matter of my application for Letters Patent tiled July 3l, 1897, Serial No. 646,634, and in combination with the pump the subject-mattei' of other claims forming a part of my application filed July 31, 1897, Serial No. 646,629.

A and A are the pump-chambers of a double-acting pump, A2 indicating the deliveryports, and A3 the suction-ports.

B is the suction-main, and B the deliverymain. v

C is the plunger, connecting by a piston-rod O/ with an engine, (indicated at 02,) of which the main crank-shaft is shown at C3.

D D indicate the delivery-valves, which, as shown, are sliding gridiron-valves,pre ferably having an appreciable but slight freedom of motion between their seats and their back bearings, (indicated at E.) A sixty-fourth of an inch I have found in practice to be sufficient, although slightly-greater play may be provided for without deleterious ei'ects.

D D indicate the suction-valves, which are similar to the valves D.

D2 D2indicate the valve-actuating rod, and

D3 l)3 valve-rods connecting the delivery and suction valves in pairs-that is to say, the delivery-valve of the one cylinder with the suction-valve of the other cylinder-anarrangement which is appropriate, because these val ves should move substantially at the same time both to open and close.

F F indicate valve-actuating cylinders, which I haveshown in Figs. Land 2 in a simple and practical diagrammatic form. Preferably I construct the cylinders as indicated in Fig. 6.

G G indicate the pistons, Workingin the cylinders F and connected with the valve-stems D2. From the opposite ends ofthe cylinder F lead ports F' F2, communicating with the valve-chamber K, from which leads also an exhaust-passage F3 and to which leads a conduit. H or H', communicating at its other end with one ofthe pump-chambers A or A', and preferably each of these conduits should be provided with a non-return valve, as indicated at h or 71,', for the purpose ot' preventing a reiiux action of water in the conduitand of maintaining it at all times substantially full of fluid.

I is a valve working in the valve-chamber K,act u ated by a positively-moving connection on the engine. As shown, it is connected, through a lever l', link J, and crank-connecting device J', with a link J2, operated by an eccentric J3 on the main shaft of the engine, the lin k motion being such as will actuate the Valve to connect one port, as F', with the pump-chamber through a conduit H or I-I' at or slightly before the time when the valve should move, the same motion of the pilotvalve connecting the other port F2 with the exhaust-passage F3.

Referring now to the diagram Fig. 5, the distance from the point 3 to the point 6 indicates the total motion of the valve, of which the portion between the points 3 5 indicates the valve-lap. The line from 3 to 4 represents the total stroke of the pump, While the line rising in a curve from the point 3, running then in a straight line along the line 6 to l2 and falling in a curve to the point 4, represents approximately the relative motion of the valve with respect to the motion of the plunger, the true point of opening being at the point marked 7 and the true point of closing being at the point marked 8. It will be obvious that before the valve in opening has crossed the line 5 to ll at the point 7 and thatin closing after it has passed the point 8 on the said line the plunger will still force out of the cylinder a volume of water which is approximately represented at the beginning by the rectangle 3 5 '7 9 and at the close of the stroke by the rectangle 10 8 ll 4, but the pilot-valve I being opened at the points substantially corresponding with the points '7 and 8 the water passing from the pump-chamber before the valve-opening point passes to cylinder F and is utilized to partly open the valve, the capacity of the cylinder to receive fluidgbeing regulated by the amount oi' Huid expelled from the pump-chamber while the pump-valve is passing through its lap and so that said volume of iiuid will move the valve through its lap. In the saine way at the end of the stroke of the plunger the pilot-valve being opened substantially at the point 8 the fluid expelled from thepump-chamber during the time when the pump-valve is closing its lap will be utilized to move the alreadyclosed valve through its lap.

Having now described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a pump the combination with a valve leading to or from the plu nger-chamber ofan actuating-cylinder, a piston therein operatively connected to the pump-Valve, a conduit leading to the actuating-cylinder from the pump-chamber and a pilot-valve controlling the admission and exhaust of the Huid from the pump-cylinder to and from the actuating-cylinder the said actuating-cylinder being of a capacity to receive behind its` piston the iuid forced out of the pum p-chamber While the pump-valve is passing through its lap in opening andclosing and the piston in the actuating-cylinder is making a corresponding part of its stroke.

2. In a pump the combination with a valve leading to or from t-he plunger-chamber of an actuating-cylinder, a piston therein operatively connected to the pump-valve, a conduit leading to the actuating-cylinder from the pump-chamber, a pilot-valve controlling the admission and exhaust of the iuid from the pump-cylinder to and from the actuatingcylinder and a non-return valve situated in the conduit leading from the pump-chamber to the actuating-cylinder the said actuatingcylinder being of a capacity to receive behind its piston the liuid forced out of the pumpchamber While the pumpvalve is passing through its lap in opening and closing and the piston in the actuating-cylinder is making a corresponding part of its stroke.

3. In a pump the combination with a laterally-moving or slide valve leading to or from the plunger-chamber and having aslight freedom of movement to and from its seat, of an actuating-cylinder, a piston therein operatively connected to the pump-valve, a conduit leading to the actuating-cylinder from the pump-chamber and a pilot-valve controlling the admission and exhaust of the Huid from the pump-cylinder to and from the actuating-cylinder being of a capacity to receive behind its piston the fluid forced out of the pump-chamber while the pu m p-valve is passing through its lap in opening and closing and the piston in the actuating-cylinder is making a corresponding part of its stroke.

GUS'IAV BERNHARD PE'ISCHE.

Witnesses:

CHAs. F. MYERS, D. STEWART.

TOO

IIO

Images