US1679012A - Valve - Google Patents

Description

July 31,1928. I 1,679,012"

E.V wlLsoN VALVE Filed beg. ze, 1925 Patented July 31, 1928.

1,679,012- UNITED STATES PATENT oFFlcE.

EDWARD WILSON, or s'r. LOUIS, MISSOURI, AsSIeNR To NATIONAL PUMP AND coliti- PRESSOR COMPANY, OF ST. LOUIS, MISSOURI, A CORPORATION OF IDIEJJAWRIEv VALVE.

Application le'd December 26, 1925. Serial No. 77,689.

My invention relates to improvements in Valves, and has for its primary object a valve which is substantially noiseless in operation.

A still further object is to construct a valve wherein the moving part is operated only through a small distance but at the saine time a relatively large free and unobstructed discharge is permitted. l

A still further object is to construct a feather valve in such a manner that there is substantially no possibility of foreign substance lodging under kthe valve andV prevent the `same from seating tightly. a

My device isy intended primarily for use in rotary compressors and similar purposes a1- though the saine can be used for other purposes. I

In'. the drawings Fig. l is an end view of a rotor such as is used in rotary compressors Showing my device in position;

` Fig. 2 is a face viewof the same looking in is the direction of the arrow 2 in Fig. 1;

Fig. 3 is an enlarged top plan view of my valve;

Fig. 4 is a side elevation of the same;

Fig. 5 is a topplan viewwith the valve and stop removed;

Fig. 6 is atop plan view of a valve similar to thatshown inFig. 3A but which is pro` vided with twoou'tlet ports; n

Fig. 7 is a top plan view of a double ended valve ;4 and Fig. 8 is an enlarged fragmental longi-v tudinal section showing theposition of the valve when open. p l Inl the construction of mydevice I employ aivalvel blockj9 which is provided with a raised face or Seat 10. Formed through the block and seat is a longitudinally extending port 11. The seat 10 is provided with a laterally extending channel 12, which is lo! cated at some distance to the :rear of the port 11 thus leaving a border 13 with al shoulder 13a. Formed in the block 9 lis a screw threaded opening or bore 14 and a cy` lindrical opening 15. `The purpose of` these will be-explained in detail later. The

block 9Jisv also provided with openings 16,

which are preferably counter-bored in jthe face 17 of the valve. These openings permitv screwsflSto be inserted therethrough for se-A curing the valve block in position while the counterbores 19 receive the heads of the screws so thatthe same will not project from the face'l?.

Resting on the seat 10 in such a manner as to cover the port 11 is a valve 20. This valve 1s preferablyformed of thin spring steel although other flexible material may be'used when found necessary or desirable. Placed on top of the valve 20is a stop 21, which has a flat top'surface 22 and a Hat bottom surface The fiat bottom surface however is relatively short (see Figs. 4 and 8), While the remainderof the bottomsurface 24 is curved. The purpose of thus curving the bottom of the stop y21 is to permit the valve to bend without any undue stresses or strains being set up in the valve 'at any `point when the same is raised. Both the stop and valve are pro vided withbores, which, when the device 1s placed lin position, are inalignment with the bore 14 and through these ores is inserted a screw or bolt 25.Y This Vfor the` purpose of securing the valve and stop tothe block 9. The valve and stop are also provided .with a bore through which a pm 26 extends, this pin extendingy into the bore 15. This is for the purpose ofprevent- Ing any possibility of the valve and stop plvotingor swinging on the screw.vv

In Fig; 6 I have shown a modified. form of c'onstructionyin which'the stop`27 is provided with two yforwardly extending tongues 2S and 29. 4These tongues havetheir under side curved in the same manneras the stop The valve block 30 is provided with a pair ofports 31 over which areiplaced valves These valves are preferably united' at the rearn end so that only one bolt and pin is necessary. By'this yconstruction. Iv obtain a valve whichA has double the outlet capacity of the valve illustrated in Fig, 3 and without increasing'the size of the valve in anyway. M y purpose ofv bifurcating the stop 27and `the' valves is to forma central passage 33 for the passage of lthe iuidcoming through the ports 31.

In Fig. 7 I have shown another modified formv of construction in which ay double ended valve, is used. In this instance the stop 34 is provided with a bifurcation'on each sidey thus forming tonguesv 35 and V36.

The valve block 37V is provided L with ports as illustrated b pins 44 while the valve 45 extends over the ports 39 and 41 and is secured in position by means of this construction of valve the seat 48 1s provided with passageways 49 and 50, the passage 49 being adjacent the vports 40 and 41 and the passage 50 adjacent the ports 38 and 39. The block illustrated in Fig. 6 is provided with the passage 51 which is adjacent the ports 28 and 29. I will describe the operation of the single port valve only, as the operation of the other types 1s the same.

`When my device has been assembled the valve 2() normally lays close on the seat 10 and being perfectly fiat and of greater width than the port will prevent any gas or other fluid from backing out. gas orother fluid being forced'through the port 11, as would be the case in Fig. 1 when the rotor 52 is rotated, the valve israised dotted lines in Fig. 4 and illustrated in P ig. 8. This will raise the valve until it comes in contact with the unvderneath surface 24 of the stop 21. When in this position it would be lifted entirely clear of the seat 10 and even the shoulder 13 thus forming an open space between the Vshoulder and the lunderside of the valve,

which communicates with the passage of cutaway portion 12. It will be noted from Fig. 8 that the flat portion 23 extends partly over this cutaway portion so that there will be no tendency for the valve to lift up from the. rib 1-0 adjacent the screw or bolt 25. Then if any foreign particles, such as dust, lint, grit and the like, should enter the portion 11, theforce of the gas or fluid, as it escapes around the valve, would carry this into the cutaway portion12 and prevent it from lodgingon the valve seat at 13. From the passageway k12 this foreign substance would have clear passage so that it could be carried away with the fluid. j j Y By this construction I prevent anypossibility of the grit or other foreign substance from lodging on the underside of the valve and preventing the same from seating properly when passage of the gas or fluid 'through the port 11 is stopped. This .Would be thecasewere the passage 1Q not present because then there would be free escape on three sides only for any grit or foreign substance while eddy currents would be created on t-he fourth side adjacent the bolt 25 causing foreign substances to become wedged between the underside of the valve and the top face of the seat 10 and prevent the valve `from seating thus causing a leaky valve.

Having fully described my invention, what I claim is 1. A `valve comprising a "block, a seat formed on one face of said block, an elonthe screw 46 and pins 47. InV

Upon any gated port formed through said block and seat, a laterally extending channel formed through said seat adjacentthe one end of said port, a strip of flexible material resting on said seat and extending over said channel and port, means having a portion thereof upwardly curved for limiting the upward movement of said strip of flexible material, means for securing said strip of flexible material and limiting means to said block and adjacent said channel and means for restraining said strip and limiting means against lateral shifting. j

2. A valvecomprising a block, a sea-t formed on one face of said block, an elongated port formed through said block and seat, a laterally extending channel formed through said seat adjacent one end of said port, a strip of flexible material resting on said seat and extending over said channel and port, means for limiting the upward movement of said flexible strip, meansfor securingsaid flexible strip and said limiting means to said block adjacent the channel, and means forv preventing side movement of said strip and limitingmeans.

3. A valve comprising a valve block having one face flat and the other curved to form a continuity of cylinder, a seat formed on the flat face of said block, an elongated port formed through said block and seat, a laterally extending channel formed in said seat adjacent one end of said port, a flexible valve located on said seat and extending over said channel and port, a stop having a portion thereof upwardly curved for limiting the upward movement ofa portion of said strip, means for securing said stop and strip to said seat adjacent the channel, means for securing said stop and` strip against side movement and means for securing said block in position.

4. A valve comprising a block, a sea-t locatedon one face of said block, a rectangular port formed through said block and seat, a flexible valve restingon said seat for normally closing said port, a stop having a portion thereof upwardly curved the remainder being flat located above said valve for limiting the upwardmovement thereof, means for securing said stop and valve to said block adjacent one end of said port, a laterally extending channel formed in the seat between the valve and stop securing means and the port whereby the accumula-tion of foreign substances between the seat and valve adjacent the point of securing is prevented and means for preventing side movement'of said stop and flexible valve.

In testimony whereof I have afxed my signature.

Images