US795594A - Foot-valve for suction-pumps. - Google Patents

Description

No. 795,594. PATENTED JnLY'za, 190s.

' w. R. EMERSON.

FOOT VALVE FOR SUCTION PUMPS. APPLICATION rmm MAR.30,1904. nmmwnn us. a, 1905.

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No. 795,594. 7 PATENTED JULY 25, 1905.

W. R. EMERSON.

FOOT VALVE FOR'S UGTION PUMPS. APPLICATION FI'LBD MAR.30,1904. RENEWED JAIL-3, 1905.

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WVILLIAM EMERSON, OF WASHINGTON, DISTRICT OF COLUMBIA.

FOOT-VALVE FOR SUCTION-PUMPS.

Specification of Letters Patent.

Patented July 25, 1905.

Application filed March 30,1904. Renewed January 3, 1905. Serial No. 239,467.

To all whom, it may concern:

Be it known that I, WILLIAM R. EMERSON, of Washington, in the District of Columbia, have invented certain new and useful Im provements in Foot-Valves for Suction-Pumps; and

I do hereby declare the following to be a full,

clear, and exact description of the same, reference being had to the accompanying drawings, forming a part of this specification, and to the letters of reference marked thereon.

This invention relates to improvements in suction-pump apparatus, and particularly to the valve mechanism or so-called foot-valve located at the lower end of the suction-pipe.

Difficulty has been experienced in providing an adequate foot-valve for high-power suction-pumps, and more especially for suction-pumps wherewith pipes of large diameter are employed, the ordinary valve arrangements being totally inadequate in connection with pipes of more than fouror five inches in diameter.

It is the object of the present invention to provide a valve construction which may be indefinitely enlarged without weakening the structure and reducing the proportionate volume of liquid permitted to pass through or rendering the valve liable to catch or break should it be temporarily obstructed or'raised from its seat bya foreign solid object finding its way into the valve-casing.

The invention further consists in certain novel details of construction and combinations and arrangements of parts, all as will be now described, and pointed out particularly in the appended claims.

Figure 1 is a side elevation of a valve embodying the present improvements, the strainer being shown insection. Fig. 2 is a top plan view of the base or bottom casting shown in Fig. 1. Fig. 3 is a vertical section through the entire valve, the said section be- ,ing taken on the line indicated at in m, Fig. 2.

Fig. 4: is a section showing a double-valve arrangement. Fig. 5 is a section showing a single.valve without a double port and central supporting mechanism.

Like letters of reference in the several fig-' ures indicate the same parts.

The valve illustrated is designed particularly for use in connection with a strainer such, for instance, as shown in Patent No. 704,012; but it will be understood that the valve construction itself is not dependent upon the strainer, but may be used independently 'sions of the guiding-flanges.

thereof and in situations where no strainer is required.

Valves such as contemplated by the present invention are ordinarily attached to and form a short continuation-of the suction-pipe, and in the accompanying drawings the suction-pipe is indicated by the letter A. To its lower end is attached a valve-body castingB, the connection between the two being by screw-threads or other approved means. The casting B constitutes the body of the valvecasing, but is rigidly connected with the basecasting O, the connection between the two being preferably formed by bolts D passing through cored registering apertures in the two castings and having suitable nuts applied thereto. The castings B and O are usually circular in form, the base-casting being composed of a top annulus 0 and a bottom plate 0, the said annulus and bottom plate being connected by flange-columns 0 between which the water is allowed to enter above the bottom plate 0 and pass up into the suction-pipe. The annulus cconstitutes thevalve-seatproper, and upon it rests a disk valve, usually formed with a metal body E, having clamped to its under face a leather packing c, said packing being preferably held by a clamping-disk c, which may be united to the body E by a screw or otherwise. The valve E is relatively thick, but is not provided with a central stem or guiding projection of any character. It is held in proper alinement and allowed to open and shut with a bodily movement by inwardlyextending guiding-flanges H, the inner edges of which are dressed to leave a space between them slightly larger than the valve-body. and

the bodily-opening movement of the valve is limited by shoulders It, forming inward exten- The chamber within the casting B enlarges above the valveseat between the flanges, as indicated at the left in Fig. 3 and by dotted lines in Fig. 5, whereby a free passage for the liquid is afforded around the entire periphery of the valve theinstant the latter rises from its seat.

In the preferred construction shown in Figs. 1, 2, and 3 the valve is shown'in the form of a double-pass valve, this construction permitting of the passage of a much larger volume of water with less valve-movement than could otherwise be secured. In this arrangement the base-casting O is provided with a central annular seat I, supported by flangeposts I, and the valve E is provided with a central aperture E the leather packing e in this instance extending across the under face of the valve and being held in place by an annular clamping-ring K. The valve-seats c and I are faced in asingle plane, and the valve, as will be seen from the foregoing description, is in theform of an annulus with a central opening of slightly less diameter than the central valve-seat I, whereby when the valve lifts from its seat liquid may pass both through the center opening of the valve and around the periphery of the valve. This construction is particularly advantageous in that with large valves the center portion of the valve is supported, and the whole structure may be made amply strong to withstand the pressure of a high column of water or the impact of a Water-pound, such as is liable to occur at any time with suction-pumps and especially during the interim of reversal.

Obviously where the valve is in the form of an annulus or disk with a central opening the invention may be extended to embrace a plurality of such valves, this being particularly desirable where the volume of water to be handled is very large and the valve is adapted for application to very large suctionpipes. In Fig. 4 one such arrangement is illustrated, and by reference to this figure it will be seen that two sets of valve-seats are provided, the seats for the outer valve M corresponding to the valve-seats 0 and I, as heretofore described, while the seats for the inner valve N are formed one by the top portion of a wall 0, constituting an extension of the inner seat of the valve N. The other seat for the inner valve N is lettered O and is supported from the base-casting by flanged colunins 0 The seats 0 and O are elevated above the level of the valve M and preferably above the shoulders h, which limit the upward movement of the latter. Said valve N is guided in its movements by guides P, formed on inward extensions of the flanges H, and the opening movement of the valve N is limited by shoulders P, corresponding to the shoulders it, but located at a higher level and nearer the center of the valve-chamber.

The bottom plate 0 is preferably im perforate in every instance,'thus adapting the valve for being-seated on the bottom of the well, and where the valve is of large capacity it may be arched at the center, as indicated at Q, in Fig. 4, in order to reduce the weight of the metal required and at the same time afford the requisite strength. The periphery of the bottom plate 0 is usually extended somewhat to receive the lower edge of the strainer R, which latter is preferably formed of a cylinder of perforated sheet metal having its upper edge rigidly connected to a cap-casting S, which is guided by the suction-pipe and may be raised and lowered to give access to the valve or for cleaning, as described in the beforementioned patent.

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

1. In a foot-valve for suction-pumps, the combination with the body-casting having inwardly projecting flanges with shoulders thereon, said flanges and shoulders constituting the guides and stops for the valve, of the base-casting having an annular valve-seat, bolted to the body-casting, a bottom plate connected with said valve-seat and a valve freely supported on said valve-seat and guided by the flanges; substantially as described.

2. In a footvalve for suction-pumps, the combination with the bodycasting adapted to be secured to the suction-pipe and having the inwardly-projecting flanges, of the base-cast ing having an annulus bolted to the body-casting and an annular valve-seat, a bottom plate formed integral with said annular casting with entrance-passages between said plate and casting and a valve freely supported on said valveseat and guided and limitedin its movements by the inwardly-projecting flanges; substantially as described.

3. In a foot-valve for suction-pumps, the combination with the body-casting adapted to be secured to the suction-pipe and having the inwardly-projecting shouldered flanges,of the base-casting having the annulus adapted to be secured to the body-casting, a base-plate, a central annular valve-seat supported from said base-plate, and a valve seating on said annulus and central valve-seat and having a central aperture therethrougl1,said valve being guided and limited in its movements by the shouldered flanges in the body-casting; substantially as described.

4:. In a footvalve for suction-pumps, the combination with the bottom plate,of the concentrically-arranged annular valve-seats supported from said base-plate, of the body-casting constituting a valve-chamber and having the inwardly -projecting shouldered flanges, and a centrally -apertured valve freely supported on said concentric valve-seat; substantially as described.

5. In a foot-valve for suctionpumps the combination With the imperforate bottom plate, the concentric annular valve-seats sup ported from said base-plate by columns between which the water enters, of the bodycasting constituting the valve-chamber,b0lted to the outer annular valve-seat and having inwardly-projecting shouldered flanges, and the valve having a central aperture and seating freely on said valve-seats said valve being guided and limited in its movements by the shouldered flanges; substantially as described.

WILLIAM R. EMERSON.

Witnesses:

ALEXANDER S. STEWART, THOMAS DURANT.

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