US528665A - Oscar gassett - Google Patents

Description

(No Model.)

0. GASSETT.

STEAM TRAP.

No. 528,665. Patented Nov.. 6, 1894.

(No Model.)

v 2 Sheets-heet 2.' O. GASSETT.

STEAM TRAP.

Patented Nov. 6, 1894.

UNITED STATES PATENT OFFICE.

OSCAR GASSETT, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO THE CROSBY STEAM GAGE AND VALVE COMPANY, OF SAME PLACE.

STEAM-TRAP.

srEcIFIcATIoN forming pere ef Lettere Peteur Ne. saaeeauetea November e, 1894.

Application tiled February 15 1894i Serial No. 500,265. (No model.)

To all wlwm it may concern:

Be it known that I, OSCAR GASSETI, acitizen of the United States, residing at Boston,Y

in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Steam-Traps; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to an improvement in steam traps. f

The object 'of the invention is to secure a quick, positive and a large opening for the discharge of water from the steam pipes leading to the steam trap, and, in order to accomplish such result, it is .found that it requires a secondary, large or main valve to Work in unison with the small or primary valve, as hereinafter described.

In constructing such a device it is found that the governin g parts must be placed Within the steam space, free from the external iniiuence of temperature, of the atmosphere, and other iniluences.

The present invention consists'in the construction hereinafter pointed out.

In the accompanying drawings, Figure l represents a face view of the steam trap; Fig. 2, a transverse vertical section taken through Fig. 1, the parts being enlarged. Fig. 3 represents a detailsectional view taken through aportion of the trap at a right angle to Fig. 2.

In the annexed drawings, the letter A represents the trap body being circular in form as shown, and leading into this body is the inlet pipe c, and leading from it the outlet pipe c and the drain pipe c2, the latter being provided with a Vsuitable cock c3. Secured within the trap body A is the case B being i held therein by bolts b passing through the flanges b. This case B has within it at the bottom the chamber b2 leading into which are the small openings b3 at the sides and at lthe bottom the circular bore b4. Above this chamber b2 the case B has a diaphragm C in which there is a central passage c laligned with the bore b4 and having on theunder side the conical portion c` forming a valve seat. Above the diaphragm C within the valve ycase B there is another cylindrical chamber D having the shoulder d which divides this chamber D into two portions d and d2 of difterentdiameters. At one side there is an opening d3 leading into the chamber D, this outlet d3 communieating with the discharge pipe a', and at the top this outlet d3 has a divergent portion d4. Within the chamber b2 is placed a valve E having the conical portion e to fit the valve seat c', and a stem e extending through Athe opening c and up into the chamber D. This valve E snugly tits the opening b4. This valve E has a central bore e2 leading up into it from the under side. Within this bore e2 is placed the upper end of a spring F the lower end of said spring resting inside the plug f which is threaded into the bottom of the steam trap body A. At its top the stem e' of the valve E rests in a socket g of a piston G which fits within the upper part d of the chamber D. This piston G has an annular groove g near its bottom, the location of this groove. being'such that it communicates with the portion d4 of the passage d3 when the piston G is at the upper part of its stroke. The passage g2 leads from this annular passage g out of the top of the piston G and into a circular recess g3 of such piston. Upon the top of the valve or piston case B there is secured a cap H having at its center the threaded bore hterminating in acountersink h within the cap, there being a space between this cap and the top of the piston G. This space and the recess g3 form a chamber above the piston G.

In the top of the steam trap body A there is a threaded hole a4 in which is secured the lower threaded end k of a pipe K. To the top of this pipe K is secured a cap lo having at its top a hole k2 anda stuffing box k3, the top also being made with a hole 7c4 closed by a tap screw 165. Secured in the hole h of the cap H is the lower end Z of a pipe L smaller than the pipe K. This pipe L extends from the cap H up centrally through' the pipe K,A

and the upper end Z of the pipe L terminates near the lower part of the hole k2 inthe cap lc of the pipe K. Rods M, M rise from the top ofthe trap body A, and carry at their top the cross head N. A't the`middle of this cross head N is a hole n through which passes ICO loosely the upper end o of a rod O, the lower end o of such rod passing down through the hole 7a2 of the cap k and having a conical end o2 which terminates just above the top Z of the smaller pipe L. Surrounding the rod O below the cross head, is a spring P, one end of which bears against the cross head and the other against a nut p secured on a rod O. Above the cross head N an adjusting nut 19 is screwed upon the protruding end o of the rod O. A protective cap Q may he placed above the adjusting nut and protruding end of the rod O, and be secured to the cross head N.

In use steam passing through the pipe a into the steam trap body A passes up into the pipe K and down through the pipe L. The steam heating the pipe L causes it to eX- pand until the upper end Z of the pipe L comes in contact with the conical end o2 of the rod O, thus forming a valve, the spring P permitting sufficient play of the rod O to prevent any strain upon the parts. The pipe L continues in contact with the rod O closing the opening between the two until sufficient water of condensation enters the trap, when the water,being cooler than the steam, causes the pipe L to contract, thus causing the end Z to withdraw from the rod O, thus opening the valve at this point. Vhen this happens the water of condensation pours down through the pipe L and into the chamber of the valve case B above the piston G. This water pressing upon the piston G forces it and the valve E downward, opening the valve E at its valve seat c. This action of the water, as thus described, is owing to the fact that the area of the piston G being greater than that of the valve E the pressure of water upon the piston G is greater than the combined pressure of water and the spring F upon the valve E. The water of condensation then pours through the opening b3 and through the valve seat c, opening o into the chamber (Z2 and out through the discharge pipe a. This continues until the water of condensation shall have left the valve body. Steam then again enters the valve body, expands the pipe L as already described, and closes the opening between the pipe L and the rod O. Whatever there may be left of the water of condensation above the piston G, or whatever modicum of steam may enter the pipe L as the steam takes the place of the water of condensation in the trap they pass out through the passages g2, g into the discharge pipe ci so that there is no back pressure against the piston G which would tend to resist the action of the steam in forcing the valve E to its seat and closing it; and by having the passage g communicating with the portion d4 of the passage d3 even after the piston G is returned to its uppermost position whatever steam there may be above it will gradually pass out into the discharge pipe a.

By examiningthe drawings it will be seen that, when the piston is pushed down itwill also push down the valve in order to open it, and when open it allows the discharge to run into the cylinder and against the lower end of the piston. The said piston in its descent cuts off a portion of the said discharge d3 until the piston has backed up pressure enough below the piston to prevent its descent to the bottom ot' the cylinder.

Having thus described my invention, what I claim is l. The combination in a steam trap of a valve provided with a piston which controls the discharge from such trap and a pipe valve which communicates at one end with the piston and at the other end opens out into the trap, as set forth.

2. The combination in a steam trap of the steam trap body A; the pipe K leading therefrom; the piston and case B; the piston therein; the pipe L leading from within the valve case above the piston, up into the pipe K; the rod terminating within the pipe K near the top of the pipe L; the inlet a into the trap body and the discharge pipe a leading from the piston or valve case B, as set forth.

3. The combination of the secondary, large or main valve with the small or primary valve, the latter being at the end of an expansion pipe which communicates at one end with the interior of the trap and at the other end with a chamber above the main valve, as set forth.

et. The combination of the secondary, large or main valve, the small or primary valve pipe, L, the rod, O, the spring, P, and abearing on the rod and on the trap frame between which bearings the spring bears, as set forth.

In testimony whereof lai-Tix my signature in presence of two witnesses.

OSCAR GASSETI.

IVitnesses:

JOSHUA I-I. MILLETT, ARTHUR L. BowKER.

IOO

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