US1692496A - Slide stop valve - Google Patents

Description

Nov.- 20, 1928.

W. FRB

SLIDE sToP vALvn Filed oct. 11, 1926 5 Sheets-sheet 1 7///////// M H M` Hg. f7? W02 lar WMM/P934' Nov.- 20, 1928.

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SLIDE sToP VALVE Filed Oct. 1l, 1926 W////////////xl Sil 3 Sheets-Sheet 2 www Nov.l 20, 1928. 1,692,496

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SLIDE STOP VALVE Filed Oct. 11, 1926 3 Sheets-Sheet 5 4 1s m19 I L J sof-jr; /Q'-pao ,34 1 ULM I Inventar www Patented Nov. zo, 192s. 1,692,496

UNITED ism'lvrlzs PATENT orifice.

WALTHEB I RB, F EBERSWALDE, NEAR BERLRI', GERMANY, ASSIGNOR T0 THE FIRE FRANZ SEIFFERT & CO., AKTIENGESELLSCHAFT, 0F BERLIN, GEBIANY.

SLIDE strop VALVE.

Application illed October 11, 1926, Serial No. 140,952, and in Germany October 18, 1925.

In slide stop valves of the types hitherto known, which are provided with a packing on each side and in which the tightening surfaces of the slide face and of the casing are not in contact with each other during the up and down-movement, the contact is brought about and discontinued by the axial spreading of the two-part slide face when in its lower position.

The slide valve according to the present invention is distinguished from the types mentioned above by its non-spreadable slide face, while both the` tightening surfaces of the casing are axially movable. This improved slide is intended for use especially 1n connection with high-pressure steam or another iiuid under high pressure, and its chief characteristic features reside in that Ifrictional contact on both sides of the sliding member proper with the opposite tightening faces of certain tubular slidable members hereinafter fully dealt with is completely prevented, iny that two of said tubular slidable members are provided and these members can be movcd towards and pressed against, as Well as withdrawn from, the said slide proper, this latter being movable only after certain gaps have been formed between it and the said slidable tubular members, all as fully described hereinafter.

An embodiment ofh the slide stop valve according to the present invention is shown in the accompanying drawings wherein:

Figs. I-IV are vertical longitudinal sec tions, Fig. I showing the slide valve closed, Figs. II and III each showing it in one of the intermediate positions, and Fig. IV showing the valve fully opened;

Fig. V is a cross-section on line V--V of Fig. I, and

Fig. VI is a cross-section on line VI-VI of Fig. I f

In all of the figures, 1 is the valvey casing, 2 is a hollow stem whichfis movable up and down and can be rotated by means of ahandwheel 4 and an intermediate bush or sleeve 3. At the top thestem 2 is provided with a collar 5 and at the bottom it has exterior screw threads oflow pitch 6 and interior screw threads following the same direction but having a higher itch, in the present case four times that of t e exterior thread. In

theupper part 8 of the casing there is a fixed stop against which a-eollar 5 will abut, thereby llmiting the downward movement of thehollow stem 2. There is also a movable stop 9 in the upper part of the casing which is pushed by the cooperation of the hand-wheel 4, the bush 3, and bevel-gear 10.

11 is a nut having pins 12 (Fig. V) at diametrically opposed places which serve as bearings for aframe 13. The latter has two pairs ofarms 14 which embrace guidingribs 15 provided within thecasing 1 whereby both theframe 13 and thenut 11 are prevented from rotating. Theribs 15 are situated in the same plane with the axis of thestem 2 and admit of a balancing movement of the frame about thepins 12.

At right angles to thelpins 12 two ins 16 are provided on theframe 13"on w ich two two-armed levers 17 are mounted. to the ends of whichrods 18 are linked. Each of these four rods actuates one of fourbellcrank levers 19 which are mounted Within the lower part of thecasing 1. Each two of these bell-crank levers 19 actuate one of twotubes 20 slidably mounted in the casing. The arrangement of parts 11-17 forms a Cardan suspension for therods 18 which are thereby enabled uniformly to actuate the bell-crank levers 19 whose driving arms are moving ingrooves 21 provided in thesliding tubes 20.

The end faces 22 of the slidin tubes 2O form the tightening surfaces of t e casing. Packing rings or the like 23 serve to tighten thesliding tubes 20 and thecasing 1 relatively to one another.

Thesliding plate 24 is carried by a nonrotatable threadedstem 26 engaging the interior threading of thehollow stem 2. Theplate 24 is provided with lateral lu s 27, by means of which it is guided on r1`s 28 in thecasing 1 which are running parallel to thestem 26. The downward movement of theplate 24 is limited by astop 29.

Twobars 30 running in guideways provided in the casing are taken along by thesliding tubes 20 by means of ins 31, the latter penetrating throughaxia slots 32 in that part of the casing surrounding thetubes 20. Theends 33 of thebars 30 which lare 'adjacent thesliding plate 24 project beyond thetightening surfaces 22 of thesliding tubes4 20.

The operation of the slide valve is as follows: In-closed condition the late 24 is in its lowermost position, the sli intubes 20 being firmly pressed against it.T e bars 30 overlap theplate 24, and thehollow stem 2 is in its raised position. When the'handwheel 4 is turned in the direction of the arrow, i. e. inv a counter-clockwise direction, each rotation will cause thehollow stem 2 to screw itself down four threads, thebars 30 holding thesliding plate 24 in fixed position. Thenutl 11 will rise on thestem 2 one thread per revolution, thus being actually lowered three threads. By means of the Cardan suspension 11-17 this motion is transmitted to the rods'18, whereb tbe bell-crank levers 19 arc caused to 'pus thesliding tubes 20 outwardly until thebars 30 will release the plate 24:, as clearly appears from Fig. II. i

Upon theplate 24 being released by thebars 30 thesliding tubes 20, and with them thenut 11, will be arrested; thehollow stem 2 will screw itself down into the nut one thread per revolution while thestem 26 will screw itself into thestem 2 fourl threads per revolution. Theplate 24 will also rise three threads per revolution until the collar 5 abuts against the stop 7, the .movable stop 9 also having been pushed close up to the collar 5, as is shown in Fig. III. In this osition the slide valve is opened far enough or action.

On further rotation of the hand-wheel 4c thehollow stem 2 will stop. While theplate 24 will now rise four threads per revolution thenut 11 rises one thread per revolution and will, by means of the Cardan suspension 11'-17, therods 18, and the bell-crank levers 19, draw the sliding tubes 2O together until thetightenin surfaces 22 come in contact. Simultaneous y the movable stop 9 will move forward far enough to overlap the collar 5 as shown .in Fig. IV. In this position the interior of thevalve casing is shut oil from steam or the like and protected against dirty- Itotation of the hand-wheel 4 in opposite direction, i. e. in clockwise direction, will cause thestem 26 and plate 24: to move downward. Simultaneously thenut 11 will also move downward, thereby pulling thetubes 20 apart until the movable stop 9 will release the collar 5 (see Fig. III). Now the slidingtubes 20 and thenut 11 will stop, thehollow stem 2 will rise one thread per revolution, while theplate 24 will descend three threads per revolution. As soon as the plate 24- is supported on the stop 29 (Fi II) thehollow stem 2 will screw itself up ourthreads per f revolution, carryin thenut 11 up three threads per vrevolution whereby the sliding tubes 2O will be drawn towards theplate 24, as shown in Fig. I.

What I claim as new and desire to sccire by Letters Patent is 1. yA slide,stop-valve, comprising in combination, a casing and two oppositely located branches extending thereinto; a shiftable tubular member in each ot' said branches; a slide adapted to be introrbufed between, and withdrawn from, said tubular members; an operating mechanism for said slide and the tubular members and comprising means for lowering and lifting the slide, means for pressing the tightening faces of the tubular members against, and for withdrawing them from, the lowered slide, and means for pressing the tubular end members against one another when the slide is lifted.

2. A slide stop-valve, comprising in combination, a casin and two oppositely located branches extent ing thereinto; a sbiftable tubular member in each of said branches; a slide adapted to be introduced between, and withdrawn from, said tubular members; an Aoperating mechanism lfor saidslide and the tubular members and comprising means for lowering and lifting the slide, means for pressing the tightening faces of the tubular members against, and for withdrawing them from, the lowered slide, and means for pressing the tubular end members against one another when the slide is lifted; and members coupling said several means in such a manner that the said tubular members are shiftable towards and away from the said slide when the slide is in its closing position.

8. A slide stop-valve, comprising in combination, a casing and two oppositely located branches extending thereinto; a shiftable tubular member in each of said branches; a slide adapted to be introduced between, and withdrawn from, said tubular members; an operating mechanism for said slide and the tubular members and comprising means for lowering and lifting the slide, means for pressing the tightenn faces of the tubular members against, and or withdrawing them from, the lowered slide, and means for pressing the tubular end members against one another when the slide is lifted; and members coupling said several means with each other in such a manner that the tubular members are moved towards, and pressed against, each other after the slide is lifted.

4. A slide stop-valve, comprising in combination, a casing and two oppositely located branches extending thereinto; a shiftable tubular member in eachof said branches; a slide adapted to be introduced between, and withdrawn from, said tubular members; a non-rotary threaded spindle extending upwardl from said slide, a rotary hollow spindle avin an interior thread engaged by the threa of said non-rotary spindle, said hollow spindle further having an exterior thread and being axially movable, means for turning, as well as lifting and lowering, said hollow spindle, a collar upon the sameya stationary abutment member and a movable abutment member both co-operating with said collar, a nut upon the exterior thread of the hollow spindle, rods extending downwardly from said nut to the shiftable tubular members and being indirectly and movably connected with the said nut, bell-crank levers carried by the said branches of the casing and being connected at one 'able tubular arm with one of said rods and at the other arm with one of the said lshiftable tubular members, substantially as set forth.

5. A slide stop-valve, comprising in combination, a casing and two oppositely located branches extending thereinto; a shiftmember in each of said branches; a slide adapted to be introduced between, and withdrawn from, said tubular members; a non-rotary spindle having an exterior thread with a steep-pitch and extending upwardlylI from'said slide, a rotaryA hollow spindle ving an interior thread with a correspondingly steep pitch engaged by the thread of said non-rotary splndle,

said hollow spindle further having an exterior thread of normal itch and being axially movable, means or turning, as well as lifting and lowering, said hollow spindle, a collar upon the same, a stationary abutment member and a movable abutment member both co-operating with said collar, a nut upon the exterior thread of the hollow spindle, rods extendin downwardly from said nut to the shifta le tubular members and being indirectly and movably connected with the said nut, bell-crank levers carried by the said branches of the casing and being 6. A. slide stop-valve, comprising in combination, a casing and two oppositely loc'ated branches extending thereinto; a shiftable tubular member in each of said branches; a slide adapted to be introduced between, and withdrawn from, said tubular tending upwardly from said slide, a rotary hollow spindle having an interior thread engaged by the thread of said non-rotary spindle, said hollow spindle further having an exterior thread and being axially movable, means for turning, as well as lifting and lowerin said hollow spindle, a collar upon the ho low spindle, a stationary abutment member and a movable abutment member both co-operating with said collar, a nut upon the exterior thread of the hollow spindle, pivots projecting from said nut on opposite sides of the same, a horizontal frame carried by said pivots, other pivots extending from said frame at right angles with respect to the first-mentioned pivots, double-armed levers carried by said other pivots, rods extending downwardly from said levers to the shiftable tubular members and being indirectly and movably connected with the said nut, bell-crank levers carried by the said branches of the casing and being connected at one arm with one of said rods andv at the other arm with one of the said shiftable tubular members, substantially as .set forth.v

In testimony whereof, I have signed my name to this specication.

WALTHER l FRB.

, members; a non-rotary threaded spindle ex-

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