US745774A - Straightway valve. - Google Patents

Description

PATEN-TED DEC. 1, 1903. E. S. BRADY. i STRAIGHTWAY VALVE.4 AA PPLIQA'HGN FILED AUG. 21, 15302.

N0 MODEL.

WITNESSES:

INVETOH l m4-7 ATTORNEY UNTTED STATES Patented December 1, 1903.

PATENT OEEICE.

EVERETT S. BRADY, OF BROOKLYN, NEW YORK, ASSIGNOR OF ONE-HALF TO ALBERT Y. KING, OF NEW YORK, N. Y.

STRAIGHTWAY VALVE.

SPECIFICATION forming part of Letters Patent No. 745,774, dated December 1, 1903.

Application filed August 2l, 1902. Serial No. 120,472. (No model.)

1!) all whom it may concern:

Be it known that I, EVERETT S. BRADY, a citizen of the United States, residing in the borough of Brooklyn, county of Kings, and

5 city and State of New York, have invented certain new and useful .Improvements in Straightway Valves, of which the following is a specification.

This invention relates to valves for controlin ling,r the iiow of liuids under pressure, and particularly to the class of gate-valves or straightway valves, so called; and the bject of the invention is to provide a valvecontrolled by-pass for the iiuid at the top of .t the main gate-valve, the controlling by-pass valve seating downward or substantially perpendicular to the seating of the main valve and adapted to be operated automatically by the same means that are employed for openzo ing the main valve. The purpose of this bypass is to relieve the pressure on the main valve before it is opened by effecting a balancing ot the pressure on both sides of said valve. v In the accompanying drawings, which illustrate two embodiments of the invention,Fig ures 1 to 4 illustrate one of said embodiments. In these Fig. 1 is a section taken along the axis of the pipe through which the duid flows 3o and along the axis ofthe valve-operatingstem.

Fig. 2 is a transverse section of the valvecasiug, taken at line co2 in Fig. 1, the valve being in elevation. Fig. 4 is a cross-section of the valve-chest, showing the seat of the bypass valve; and Fig. 3 is a similar section showing the by-pass valve in plan. Figs. 5, 6, and 7 illustrate the other embodiment of the invention. Fig. 5 is a section similar to Fig. 1; and Figs. 6 and 7 are sections similar, 4o respectively, to Figs. 3 and 4.

In the 'first-named embodiment the operating-stem is non-rotative and moves longitudinally when the valve is displaced, and in the last-named embodiment the stem is rotative,

but does not move longitudinally, being collared.

Referring, primarily, to the tirst four figures of the drawings, 1 represents a pipe or conduit through which a uid under pressure-as 5o steam, for example-flows in the direction indicated by the arrow .e in Fig. 1. In the pipe is a valve-casing 2, having in it a seat 3 and on it a box 4. A gate-valve 5, which closes to the seat 3, serves to controlfthe How of iiuid through the pipe. The pressure of the fluid holds the gate-valve pressed up to its seat with a force corresponding to the area of the said valve in square inches multiplied by the pressure per square inch ofthe steam or other fiuid. In order to operate the valve 5 and to 6o relieve the pressure of the fluid thereon at the time of opening said valve, the mechanism now to be described is employed.

6 is the operating-stem of the gate-valve. This stem is screw threaded and screws 65 through a nut 7, which has in it a circumferential groove that is engaged by a sectional bearing 8, secured to the top ot' the box 4. The nut 7 forms the hub or boss of a handwheel 9. The lower or inner end of the stem 7o 6 has a square head 10, which tits in a recess in the back or top of a by-pass valve 11, which rests on a seat 12 in a valve-chest 13, formed in the top of the gate-valve 5, controlling two passages14 in the valve 5 and leading out 75 through the respective opposite faces thereof.

It may be stated here that the chest 13 is closed above by a screw-plug 15, having in it a squared aperture to receive a tubular squared stem 16 on the bypass valve. This 8o stem has a flange which is screwed to the back of the by-pass valve to form a cage or keeper for the headlO of the stem and keep the latter in its recess.

To operate the valve, the hand-wheel 9 :is 85 turned, thus rotating the collared nut 7, which forms its hub. This has the effect to draw up the screw-threaded stem 6, which cannot rotate, and thereby litt the by-pass valve 11 from its seat. This permits the duid to flow 9o by or over the valve 5 by way of the passages 14 and equalize the pressure on both sides thereof; 'but after the valve 11 has been elevated to a slight but suficient extent its back engages the cover of the chest 13 and the 95 further movement of the stem lifts or displaces the gate-valve 5 and opens a full passage for the steam or other fluid. The displaced, valve passes into the box 4, which will be made steam-tight by means of a stuflingroo box 17, through which plays the smooth or unthreaded portion of the operating-stem 6.

In Fig. 1 the middle portion of the box and stem are broken away for want of room. In closing the valve to cut off the dow of Huid the by-pass valve 11 closes first and then the main valve 5 closes.

Obviously any form of valve 11 may be employed according to the form, size, and kind of gate-valve to which itis to be applied, and the stem 6 may be coupled non-rotatively to the valve 11 in any way desired. Preferably, however, the coupling will be loose enough to allow the valve a little freedom or play for seating evenly. The ports and passages 14 may also be of any desired shape or form. In the embodiment described the ports covered by the valve l1 open at the respective sides of the center of the valve and are of a somewhat crescent shape in cross-section. In some kinds of straightway valves this construction and arrangement is desirable as economizing available space.

In the embodiment of the invention illustrated in Figs. 5 to 7 and which isy the form preferred where the space for placing the valve is contracted the main Valve 5a is substantially the same as in the first-described embodiment, and the by-pass valve 11a is the same also, so far as its valve functions are concerned. In this embodiment, however, the inner end of the operating-stem 6a is screw-threaded and screws through the valve 11a as a nut, and on the upper part of said stem is a collar 10a in a bearing and keeper 18 exterior to and on the box 4a. The hand-wheel 9 in this form is fixed on the outer end of the operating-stem, and the stuing-box 1'7a is situated between the collar and the hand-wheel. The stem 16 in this construction is or may be integral with the bypass valve. The ports 143, controlled by the by-pass Valve, are represented as disposed, respectively, in front of and back. of the center of the said valve or in a vertical plane perpendicular to that of the said ports, as shown in Fig. 4. In Fig. 5, also, the valve 11' is shown provided with packing ou its face, and the seats about the ports 14a are shown as slightly elevated. These are not material differences, but such as may be made under certain conditions to accord with the judgment or particular views o f the constructor.

In the operation of the device, as shown in Fig. 5, the collared screw-stem 6L is rotated and first lifts the by-pass valve. Then the main valve lifts. The screw-stem passes through the main valve as the latter lifts.

verse to the axis of the pipe through which the Huid Hows and the by-pass valve on the top of the gate-valve, with the plane of its seat substantially perpendicular to the seat of the main valve, the said by-pass valve controlling ports in the main valve and being operated by the same stem as the main valve. Obviously, also, the operating-stem may be disposed above, below, or at the side, and the invention may be applied to any valve to which it is adapted. The language of the description relates to the application of the invention as illustrated.

Having thus described my invention, I claim- 1. A main straightway valve, having a cylindrical valve-chest formed on its top and port-passages leading from opposite faces of the valve into said chest, a screw-plug 15 in and closing the top ot' said chest, said plug having in it a square aperture, a circular bypass valve in said chest and having a tubular, square stem which ts and plays in the aperture in the plug 15, and the lifting valvestem engaging said squared tubular stem on the by-pass valve, substantially as set forth.

2. A main straightway valve, having a cylindrical valve-chest formed on its top, ports in the bottom of said chest disposed in a plane at right angles to the main conduit,-

passages in the main valve connecting the opposite faces of the latter with the respective ports, a by-pass valve in said chest, said valve having a square, tubular stem, a screwplug in and closing the top of the valve-chest and having in it a square aperture through which extends the square stem on the bypass valve, and the lifting-stem connected with the by-pass valve.

In witness whereof I have hereunto signed my name, this 19th day of August, 1902, in the presence of two subscribing witnesses.

EVERETT S. BRADY.

Witnesses:

HENRY CoNNETr, PETER A. Ross.

IOO y

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