US2037497A - Reciprocating valve - Google Patents

Description

April 14, 1936. Q BURNHAM 2,037,497

REC IPROCATING VALVE .Filed Aug. 24, 1934 2 Sheets-Sheet l AM`W/ :1r/toman p y April 14, 1936. c. BURNHAM 2,037,497

RECIPROCATING VALVE y Filed Aug. 24, 1934 2 Sheets-Sheet 2 v n f ,Patented Apr. 14,1936

3 Charles Burnham, Washington, D. C., assignor of V one-half to Ralph Burnham, Pasadena, Calif.

` Applicaties August v24., 1934, serial No. '141,314V 3 (xmms.` (o1. asl-2 8) This invention relates to that type of valvel in whicha beveled valve seats against a beveled seat, and the main object of this invention is to provide a simple land inexpensive means whereby,

when the valve is open, wire-'cutting of the seat is entirely avoided," thereby maintaining the valve in'a. non-leakage condition fora great length of tima-as more fully' hereinafter set forth.

Referring to the drawings annexed, Fig. 1 is a vertical sectional view of the valveshowing the valve closed;

Fig. 2 is a similar view showing the lvalve moved to a position where it is about ready to open;

Fig. 3 is a horizontal sectional view through the Fig. 4 is an exploded view of the'internalparts of the valveyand A y,

` Figs. 5 and 6 are views of the details hereinafter described. y

Figs. 'l 8, and 9 are views showing modifications.

Referring to the drawings by reference characters, Ill designates the valve casing having the usual valve chamber provided with the usual diaphragm II extending acrossits interior and provided with a thre'aded opening in alignment with an upstanding tube I2 havingcommuniea-` tion with the'chamber I0. Nicely fitting the interior of the tubular extension I2 is a tube 4I3 whose upper part is interiorly threaded at I4, and

which, at apointjust below said threaded part I4, isprovided with an annular series of ports I5. Just below the ports I5, the .tube I3 is provided with a shoulder I6 which faces downwardly and is adapted to bear upon the upper, horizontal face of the division wall I I. At a point below the shoulder I6, the tube is reduced in diameter and externally threaded for engagement with the internal threadt in the opening in the division wall vI I. At a point below this threaded portion of the cylinder I3, the cylinder isL again reduced, in diameter and provided with another annular series of ports I1, and below the ports I'l the cylinder fits nicely the inner face of the wall of a pocket I8 formed integral with the chamber IIJ and closed all around. The portions are such that when the cylinder I3 is screwed down into the division wall then the lower, reduced end ofv the cylinder I3 makes a water andsteam tight connection with the bottom wall of the pocket II by being pressed against a lead or other washer I9 resting upon the 4bottom of the pocket.

0n top ofthe tube I2 and clamped'by means oi' a ring nut 2li` is an annular iiange 2| .formed on the lower end lof the capl 22 which carries a 56 stuffing-box and packing'gland o! the usual oonx and the body of the member 22 is provided with'a are closed, as shown in Fig. 1. And when the p the inlet ports I1 are kept closed by the tubular struction, through which the usual rotatable, slidable valve ste1n`23' extends. On its lower face the cap 22 is provided with anannular series of lugs 23 which extend down into the tube I2 and between cooperating upstanding lugs 24, extend- 5 ing upwardly from the upper edge ofthe tube I3,

nut formation whereby by the useof a wrench applied to the nut formation 25 the cap 22 may be utilized for screwing in or screwing. out. the 10 cylinder I3, the ring nut 20 being Aof course first removed to permit this operation. B ythus screwing down the cylinder` I3, thethreaded portion thereof engages the internal threads in the hole in the division wall II, shoulder I6 is pressed i5- hard against the division walljand thel extreme lower end of the cylinderis forced down `hard against the washer or ring I9,` thus rendering the joints Water and steam tight. The stem 23 at its lower, inner. end is provided 20 with a threaded enlargement 25' which fits the threaded interior of the seat-tubel and swivelly` connected to the lower end. ofthe stem is a valve disk 25, this swivel connection being ancomplished by a headed pin 2-1 projecting up- 25 wardly from the upper face of -\the disk 26 `and engaged in an open notch 28 formed .in the bottom wall of a claw-like short cylinder 29formed integral and depending from the lower side of the threaded enlargement 25. ,By means of this 30 connection between the valve disk 26 and the stem, the valve disk and stem willhavean independent rotative action to thus insure the proper opening and closing of the valve disk. The valve diskl seats against a beveled seat 30 formed in theV 35 seat-tube I3 at a point just below the ports I5. Formed integral with and dependingfroin the valve disk 26 is a cylindrical supplemental valve or secondary valve-tube 3| whose exterior nicely fits the interior face of the lowerpart of the tube 40 I3 so as to be capable of opening as well as closing the inlet ports I1, and at a point where this valve-tube 3l joins the valve disk 26, thisv tube is provided with an annular series of outlet ports 3 2, which, when this valve-tube is raised, 45 puts the interior of the tube into communication with the outlet ports I5. The sizes `and positions kof the ports I1 and 32 and the length of the valve-tube 3l `are such that when the main valve 26' is seated both these sets of ports 1504 main valve is moved upwardly to open position,

secondary valve 3| until the upper edge of the valve-tube (which forms edges 3|' I5.

of the ports 32) has been raised high enough to serve as a guard or fender for the valve seat 30, as shown in Fig. 2, thereby completely preventing the out-rushing fluid from .wire-cutting said seat 30. It will be 'noted that the main valve cannot even be cracked without being fully protected against wire-cutting.

In the modifications shown in Figs. 7 and 8, the cylinder I 3' is not threaded into the passage through the diaphragm II, but instead is seated against a beveled seat therein, and instead of the interlocking lugs 23, 24 for rotating the cylinder I3 to screw it into place, I extend the top edge of the cylinder I3 high enough to abut directly against the cap 22 so that when the threaded ring is screwed down onto tube I2 the cylinder I3 will be jammed hard into place, with its beveled part against the seat and diaphragm II and its lower end againstthe washer ring or disk I9. In this form of device, it is desirable to use a washer 35 between the member 22 and the upper end of the tube I3.

In this modification I show also a slight modified form of the main valve. In this form the head 36 of the combined supplemental valve and guard 3l is provided with a central threaded opening down through which is screwed a pin 31 formed integral with the head 21, this threaded pin or extension 31 serving to clamp on top of the head 36 a flanged disk 38, a seat washer 39 being clamped between these two parts 36 and 38. This seat washer 39 faces directly downward and is adapted to seat against an upwardly-fac'ing valve seat formed on the cylinder I3 instead of the beveled valve seat shown inthe other figures. In this construction as in the form shown in the other figures the distance between the lower edge of the valve cylinder 3I andthe bottom edges 3I of its outlet ports is such that these bottom edges are raised to a protective position with respect to the valve seats before the inlet openings I1 are opened. It is desirable that the lower end of the screw pin 31 shall be tapered in order to divide the up-going stream of fluid and divert it equally through the ports 32.

In Fig. 9 I illustrate one way of insuring a fluidtight joint between the valve-tube 3I and its guide tube I3. For thispurpose, vI provide a groove in the inner face of the wall of the tube I3 and place therein a split piston ring 40 of common form, this ring being of course so located that in all adjustments of the valve tube,

the tube will lap this ring. With a packing ring of this sort, the main valve 26 may be cracked without danger of fluid leaking up behind the guard to the valve seat 30, thus insuring against wire-cutting of the seat even when the main valve is cracked to the most minute degree. For convenience in assembling, the lower part I3 of the tube I 3 may be made separate from the main part of the tube and screwed into its lower end to thus form an annular cavity for the packing ring, and also the top inner corner of the packing ring and the lower outer corner of the tubular part 3| may be slightly beveled to enable the Avalve to be readily inserted down into its guide tube i3 when the parts are assembled.

I claim:

1. In combination, a valve casing having an upstanding tube exteriorly threaded, a hollow cylinder slidingly fitting down into said tube and provided with a valve seat surrounding the passage through the casing and internal threads and having an opening communicating with the outlet of the casing, a ring nut screwed on the threaded part of said tube, a cap having a flange which is clamped on the top end of said tube by :aid ring nut, said cap having a nut formation above the flange adapted for the use of a wrench, interlocking lugs between said cap and the upper end of said cylinder, and a slidable-rotatable stem extending down through said cap and provided with a threaded member for engaging the internal threads of said cylinder and a valve.

2. In combination. a valve casing having a passage and a valve-seat member therein and also a closed cylindrical portion below said member, a

cylinder supported on and attached t0 said member, the lower end of this cylinder depending into and fitting the interior of said cylindrical portion of the casing, the part of this cylinder between said cylindrical portion and the valve-seat being provi-ded with an inlet port, a main valve and means for moving it toward and from said seat, this main valve. being provided with a depending cylindrical supplemental valve fitting into the aforesaid cylinder and having an outlet port at its upper end and its lower end open.

3. The structure in accordance with claim 2, the lower end of said cylinder being open and a packing being employed between said lower end of the cylinder and the bottom of the closed cylindrical portion of the casing.

' CHARLES BURNHAM.

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