US113337A - Improvement in stop-valves - Google Patents

Description

J. L. PEAKE. STOP VALVE. No. 113,337.

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Patented Amr. 4, 1871.

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aan sala .J'OHNyLQ 'PEAKR OFNEW YORK, NQY.

Letters Patent No. 113,337, dated April 4, 1871.

IMPROVEMENT in s'roP-vALves.

.'Lhe-Elchedule referred to in thee'Lettex's Patent and making part of the same.

To all ivhom it may concern Be'it known that I, JOHNA L. PEAKE, of the city .and county of New York, in the State of New York,

cut their way into any dirtwhich may lodge in. the

space below,` and I provide-a Vliberal space in which, such dislodged dirt may lie during the time while the vvalve is shut. On the opening of the valve the current of water, steam, or other duid dislodges and washes away the dirt.

In cases where, as usual, the duid is received on one side and discharged on the opposite side, there may be but two of these gates, one covering the receiving and the other the discharging side; but I can, inlarge valves Yof this class, divide the receiving-orifices into two or more, and the discharging-orifice, being similarly divided, I can employ a corresponding number of separate gates with the iixed wedges to drive them outward as they descend. In cases where there are three or more separate pipes or corresponding connections it is proper to provide always a corresponding number of these separate gates.`

The nearest previous approximations to my coustrnction have employed elastic cylindrical gates ex-l tending nearly around in one piece, with a xed wedge received in the opening. Such construction requires a delicate adaptation of the elasticity and strength to inlh'll 'the conditions required,and the action is, at the best, imperectly distributed. When the wedge opens he springy e-yiindrical gate, it induces a kind of side movement arcund alarge portion ci" the periphery, and, whether this is greatly resisted by friction or not, itis certain to the surfaces. Along lines a little distant from the wedges the pressure will be very great, while opposite 'to the wedges it will be almost inappreciable.

My invention induces a 'nearly perfect distribution of thc'pressnre and wear.

I will proceed to describe what I consider the best means of carrying ont the invention.

`The accompanyingdrawing forms a part of this,

specilication.

Figure I s a central vertical section.

Figurp is a horizontal section on the lineS S in 'gSimila-r letters of reference indicate like parts in both the figures.

A is the casting which forms the main casing. It

is internally threaded to receive pipes at opposite induce unequal pressure and wear ofsides, and to receive the proper-threaded cap B at lthe upper side, which has a suitable internal thread and studng-boxes to carry the partially-threaded and partially-smooth screw-stem G with its hand-wheel c.

, The lower'end of the screw C carries alipped collar,

0, which is adapted, by the aid of a nut, C, to take hold of lipped internal projections from the gates'and compel them to rise and sink with the screw, while they are at liberty tomove outward and inward within moderate limits.

Ai A1 are tapering wedges, accurately finished by machinery or-otherwise, and secured in the positions represented by rivets A? A.

Internal lips or extended surfaces a are provided around the orifices, which communicate with the pipe nozzles on each side.

Dl D2 are separate gates, nicely turned or otherwise nicely nished to a cylindrical surface on. the exterior,

and provided with lipped internal projections dl (l2, f 4'adapted to be engaged by the lipped projections on the screw, as represented. The edges of the gates Dl D2 are finished in a planing-machine, or otherwise, so as to present true surfaces.

Now, when the screw@ is adj usted to hold the gates D1 D2 at aproper elevation, the passaggi-om onepipc to the other is openfan'd the steam or other fluid moves freely through the structure. Under these conditions the gates D D yieid slightly by the Yslay aiibrdcd at their connection with theA screw f8, there is no appreciable friction te retard their ascenA or descent.

IVhen, by the turning of the screw G, the gates are depressed, they maintain the same condition, slightly deflected by thc current oi' -water across 'their lower edges until they approach their lowest positions. lien their edges begin t be guided forcibly by the wedges Al.. These press them strongly and evenly cutrrrd against the seats a, and. at length the fnrt'ncr turning `of the screw C is arrested by the resistance due to the forcible pressing of these gates DI* I): against 'the faces a by the action of the wedges A' A?.

rlhe connections d d2 are at about the middle heights of the gates I)x D2. The screw G, with its not U2, extends alittle below these, leaving a large empty space within and above the lower edge-fJ of. the gates. This space is ample to accommodate sand, scales of rust, or other foreign matter, whif: I denominate by the collective term dii-t, which may have gathered from any canse in the bottom of the structure. In cases where water loaded with fercign matter has moved at a very moderate rate through the structure for a long time, it may chance that the entire oaiity below the passages is filled with densely-packed earth y or `mineral matter. This might intcriere with the descent 'of the gates exceptfor the sharpening of their lower edges and the ample space provided for thedis'- Alodging of such foreign material adjacent to the snrfaces'a. The stn' thus dislodged by the sharp edges and crowded inward toward the axial Iline, ofthe screw C, rests there until the gates Dl D2 are' again lifted,

when it will 'be immediately washed or driven away,

Z`vif vthere is'any considerable force in the motion of the iuid.4 l A,I have shown the wedges A1 as joined to the part A'byseparate rivets.' rlhey may be joined by rivet-v ing (o'r similarly npsetting) projeotions'tormed on either of the parts, and 'made to apply in'correspondng holes in the other. I believe it possible, with suitable tools,

to tnishthe edges of the wedges with perfection and form the wedges A in one piece with thecasi'ng A.

4In caseswhere, from anyv cause,'the gates D, 8m., are not forced perfectly home against the adjacent' surface by the wedges A1, my valve packs itself, by

the pressure ofthe steam or other duid on its interior` I' This is eifected by reason' of the-'ready yielding of the parts D I)2 realativelyto each other and to theoperating stem O. @Bhe steam Aor other uid meeting. the first gate presses it alittle `inward and'lls the interior of the valve to a tension 'about eqnal'to that in the receiving-pipe. But the pressure thereby in- Iduced in the interior of the valve, tol wit, in the space the water-passages and to the surfaces a, as herein set forth.

`2. The gates Dl D, made with the lower edges thin and sharp, so as to cut into'and dislodge any accumulation of solid matter in the cavity at the base and allow it to be retained in the space provided below the connection to the stem C, and be carried away by the current on openingthe valve, as set forth.

In testimony whereof I have hereunto set my name inpresence of two subscribing Witnesses.

' JOHN L. PEAlE. Witnesses:

TnoMAs D. S'rn'rsorr, O. O. LIvmGs.

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