US 861566 A
Description (OCR text may contain errors)
PATENTED JULY 80, 1907.
APPLICATION FILED MAR. 7, 1907.
UNITED STATES PATENT OFFICE.
EDUARD WIKILOF LUCERNE, SWITZERLAND.
Specification of Letters Patent.
Patented July 30, 1907.
Application filed-larch 7,1907. Serial No. 361,107.
larly to the construction of valtes such as are used in pumps of the compressor or' blowing engine, vacuum or other types, in which a sliding valve body, which maybe of the piston orflat seated type is provided with ports which are moved into and out of register with ports of the valve casing and the valve body has its ports provided with flap valves.
Theobject of my invention is the production of a simple and effective construction suitable for opera tion inhigh speed machinery and in which the'flap valves are made light so as to have little inertia and hence act quickly and are arranged to uncover the ports controlled by them as much as may be necessarywith a small amount of lift, the construction being such that the flap valves require no 'backstops and the amount of lift may vary automatically with the conditions of service.
The various features of novelty which characterize my invention are pointed out with particularity in the claims annexed to and forming a part of this specification. For a better understanding of my invention, however, and the advantages possessed by it, reference may be had to the accompanying drawings and descriptive matter in which I have illustrated and de-- scribed .iorms illwhich my invention may be embodied.
In the drawings, Figure 1 is a sectional elevation on the line 1-1 of Fig. .2, of a slide valve having ports controlled by my improved lift valve, D. Fig. 2 is a side view of the valve shown in Fig. l with part of the flap valve removed. Figs. 3, 4 and 5 are plan views of the different strips of resilient material of which the flap valves are constructed. -Fig. 6 is the sectional elevation on the line 6ii of Fig. 3. Fig. 7 is a sectional elevation on the line 77 of Fig. 4 Fig. is a sectional elevation on the line 8-8 of Fig. 5. Fig. 9 is a view similar to Fig. 2, showing a modified form of my invention and Figs. 10, 11 and 12 are plan views of the different flap valve strips employed in the construction shown in Fig. 9'. f
In the valve, construction shown in Figs; 1 to 8, A
represents a casing wall or seat having ports A and A which may lead to the opposite cylinder ends of the compressing cylinder of the double acting blowing engine'or the like, andA represents an inlet port. The sliding valve body 'B working on the upper face-oi the casing A has sets of outlet ports B and B The valve body is moved by the stem B to bring the ports B and A and B and A alternately in and out of register. When the ports B and A are in' register, the ports A are connected to the ports A by a. passage B formed in the valve body B. Similarly when the ports B and A register, the passage B connects the ports A and A.
Each of the ports B, which are arranged in a row, is placed end to end with a corresponding port 13*, the
,ports B being arranged in a row similar to the ports B. The flap valves controlling each of the ports B and B eachcomprises a set of thin, narrow strips or fingers C, C and C formed of resilient material. Each finger O entirely covers the corresponding port B or B while the fingers C extend over only a portion of the length of the corresponding port, and the topmost finger C extends over only a shorter portion of the corresponding port. In the form shown in Figs. 1 to 8 .inclusive, the fingers C, covering the ports in one half of the valve body, are all integrally connected by abody portion 0 between the ports B and B and the corresponding fingers C and C are similarly connected by body portion 0? and C. Registering apertures C formed in the body portions 0, C and C receive bolts D carried by the valve body and a clamping bar D and nuts'D on the threaded outer ends of the bolts D are employed for clamping'the plates firmly against the portion of the alve body between the ports B and B It will be understood that another and similar set of fingers and clamping bar D are employed for the port shown as uncovered in Fig. 2, though I may integrally connect all the fingers and employ a single clamping bar.
In order to insure that the fingers C properly close the ports B and B when the flap valve is in the closed position, I may advantageously bow initially the outer plates as shown in Figs. 6 and-7, while making the inner plate flat, as shown in Fig. 8, so that in the closed positions of the fiap valve fingers each finger C is spring held against its seat.
In operation when the ports B, for instance, are moved into register with the. ports A and the pressure rises in the latter, the corresponding flap valves lift and allow the passage of air through the ports B. As the fingers are narrow, overlapping the ports but little, and fingers for adjacent ports are separated, a very slight lift is suflicient to make the escape passage between the fingers G and the top of the valve body cqual -to the area of the ports B. Furthermore, sis amount of lift depends upon the difference in pressure above and below the flap valves, thus automatically accom- Inodating itself to the conditions of service and as soon as the pressure above and below the flap valves is equalized, the valves close. By making the flap valves of this composite leaf spring form I am able to entirely dispense with the rigid back bearings that it has heretofore been found necessary to employ in valves of this general type to stop the lift of the flap valves, and
, port and flap valve for-,said
against which the flap valves tend to knock themselves to pieces.
My improved flap valves are comparatively easy to construct and properly assemble and the valves are capable of an automatic variation in'the amount of lift to accommodate the needs otuse'. I
In the construction shown in Figs. 9, 10, ll and l2, which I prefer on account of the simplicity over the construction shown in Figs. 1 to 8 inclusive, the flap valvesfor each pair of end to end ports B and B are formed by three strips 0 0 and O which maybe rectangular in outline and cut from stock strips br'bars. Advantageously the strips 0 and 0" may; be'bowed as are the upper two plates in the construction s own in Figs'l to 8. The strips are held in position by guide'pins I) carried by the valve body which pass through apertures 0 formed in the strips. The various strips are clamped against the valve body by projecting over said port, the portions of said strips pro-- jecting over said port being of dilferent lengths, said portions of the outer strips being shorter thanithe corresponding portions ot'the stripsless remote'from the valve body. j 2. In a valve for pumps, the combination with a sliding valve body moving over a port or ports of the compression cylinder, said body having tormedin it a narrow elongated port comprising a thin.
narrow, elongated strip of resilient material extending over the 'port and one or'niore superposed similar strips;
each having a 'pprtion'wliich extends oversaidp'ort and ,is shorter than the correspondingportion 0t the strip immediately beneath it 3. In a valve for pumps, the (combination with a sliding -xvalve body moving over a port or ports ofiidie compressing:
- strips or fingers of'llght, thin,
cylinder, said body having fo'rined iniif'one or more sets of ports each set'of ports comprising two'narrow' elongated pdrts placed end to end, ah'd flap valve'sfomprising two resilient material connected together for each setnf ports, each flnge'r'entirely covering one ot-said two ports and one or more similar iingers super posed thereon and means for securing said resilient material against the body between the ports, the superposed strips'exten'dlng over a portion only of ports.
4. In a valve for pumps, the combination with a sliding valve'body moving over a port or ports of the compression 1 ports and one means for securing all of said strips against the body of ports and one or elongated ports placed senses cylinder, said body halving in it a plurality of narrow,
elongated ports arranged in two rows with one port of "each row in line with the corresponding port of the other rowand flap valves for said ports narrow strip of resilient material for comprising a light, each pair of alined or more similar superposed strips, and
the valve between the rows of ports, the superposed strips being each shorter than the strip beneath it..
5. in a valve for pumps, the combination with a sliding valve body moving over a portorports of the compression cylinder, said body having in it a plurality of narrow,
elongated ports, arranged in two rows with one port of each row in line with the corresponding port of the other row and iiap valvesfor'said ports comprising a light, narrowstripot resilient matrialfor each pair of aiined securing all of said strips against the body'of the valve between the ,rows of ports; the superposed strips being each shorter than th e strip beneath it, said'means including a clamping bar extending between the rows of ports and means for drawing it] toward said valve body.
6. in a valve, a valve body, having a pair of narrow, end to end and flap valves for said ports comprising a set otjnarrow rectangular strips of thin, resilient material superposed one above 'the' other and clamped against thevalve ends of the'por'ts with portionsjof-their free ends pro-- more similar superposed strips, means'for body between the adjacent jecting over the ports,'thepro1ecting portions of the outer strips being shorter the ,inner strips p 7. In combination a'valve'body having "two rows 0! nar row ports, each port being elongated in a dir'ection transverse to, the direction of the rows/and than the corresponding portions ot ,ports, comprising a light, narrow strip orfinger of. resilient material for and extending over each port and one orflnore superposed corresponding strips extending over a portion' only of the port, the extending portion of each of said superposed strips being shorter than the corresponding portion of the strip beneath it, and means for securing all of said strips in place compyising a clamping bar extending between two rows of ports and means for drawing said clamping bar toward gum valve body.
8. in combination a valve body having two rows of narrow. ports, each port being elongated in-adirection transverseto the direction. ot'the rows, and flap valves for-said ports, gzpmprisinga light, narrow strip or finger of ili eiit flap valve'for said 1 material for and extendingfover each port'and one or more I sifperposed strips entending over a portion only of theport, theex'tending'portionot each of said superposed strips being shorter than'tli'e corresponding portion of the 'strip"benea'th 'it, and said,superposed strips being also initially made'cohcave toward the valve body, whereby the flap valves are normally spring pressed against the valve body.
I I portal) with.
Witnesses Enw. Hanan, v
K an Human.