US1433094A - Plate valve - Google Patents

Description

F- W. PARSONS.

PLATE VALVE.

APPLICATION FILED MAR 31.1921.

Patented Oct. 24, 1922.

2 SHEETSSHEET l.

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F. W. PARSONS.

PLATE VALVE.

APPLICATION FILED MAR-31.1921.

1,433,09Q, Patented Oct. 241, 11922.

2 SHEETSSHEET 2.

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PLATE VALVE.

Application filed march 31, 1921. Serial Iil'o. 457,188.

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Be it known that I, FREDERICK W. PAR- SONS, a citizen of the United States, and a features of which among others, resides in ide formed sepa-' y the fact that a valve rately from the valve p ate and prefera having guide arms, is suitably attached to the valve plate at spaced points. A

One method of attaching thevalve guide or guide arms to the valve plate is by welding, as for instance electric spot welding,

but this method presents certain practical difficulties and disadvantages due in part to unsatisfactory means for controlling the heat in order to avoid the weakening of the metal at the welds by too high temgerature the critical temperature being di cult of attainment with certaint On the other hand dith izulty has been experienced in mechanically securing the valve of rivets for instance, because rivets of various known types have'been found to break or cause the guide arms orvalve plate to crack or break usually at or near the rivet holes under the severe strains, peculiar to this type of valve, to which the valve plate and valve guide are subjected in operation,

particularly in high speed machines.

The objects of the present invention are- 'to secure satisfactory means which are at the same time simple and eflicient for attaching the guide arms to a valve plate so that the valve guide, guide arms or valve plate 'will not crack or break in practical operation, except perhaps under exceptional circumstances, against which contlngency no I safe guard can of course be absolutely reguide arms may be riveted'to the valve plate tion of Thomas J. guide and valve plate together, as by means provided certain features of construction be followed in accordance with the underlying principles of my invention, discovered through actual experience, and such improved riveted construction obviates the disadvantages of welding, prevents breakage under all ordinary circumstances, and perm ts manufacture in quantity production w1th certalnty, uniformity and precision.

()ther features, hereinafter to appear, in

addition or complementary to the form of the rivets, enter into the construction and contrlbute 'to the solution of a mechanical problem which has proved to have great diflicultles, owlng apparently in large measure to the strains and stressesin plate valves of the type referred to, which; sometimes produce unexpected and undesirable results, not apparently deducible from known factors."

One of the preferred forms of invention is shown in the accompanying drawings, in which L have chosen to illustrate a complete valve assembly of the plate valve type, inorder to .make all details of the inventlon clear. So much of the drawings and specification as relate to the safety dowl for the spacing washer beneath the valve guide are covered 1113 1 the copending applicaart, Serial No. 456,597, filed March 29, 1921, but this feature is herein shown in order that the valve may be illustrated and described substantially as actually manufactured.

In the drawings Figure 1 is a top plan view of a stop plate.

Figure 2 is a transverse sectional view of the stop plate on the line 22 of Figure 1 lookingin the direction of the arrows.

Fig. 3 is a top plan view of the valve guide and valve plate, with the springs omitted;

Figure 4 is a transverse sectional view of the valve guide and valve plate on line H of Figure 3 looking in the direction of the arrows with the springs in position over the rivets;

Figure 5'is a detail perspective view of the valve guide; I Figure 6 is a detail perspective view of the valve plate;

, Figure 7 is a detail perspective view of one of the rivets for riveting the guide arms to the valve plate;

Figure 8 is a perspective view of the spacing washer showing the safety'dowel;

igure 9 is a top plan view of the, valve seat;

Figure 10 is a transverse sectional view of the valve seat on the line 10-10 of F igure' 9looking in the direction of the arrows, and

Figure 11 is a transverse sectional elevation of the valve with the arts assembled taken on the line 10-10 of igure 9.

Referring to the drawings and at first more particularly to the assembly shown in Figure 11, a discharge valve is illustrated, although the invention applies equally to an inlet valve, and the valve COIIlPIlSBS'tL valve seat A having the ports B, a valve plate C, a valve guide D having a central body ortion E .and curved guide arms F attache to the valve plate C by means'of the rivets G,

a spacing washer H adapted to be arranged beneath the valve guide D and between the valve guide and the valve seat A, a stop plate or guard J having apertures K,'and

recesses L for the reception of springs 0 preferably adapted to be seated upon the rivets G, so that the springs do not bear directly upon the valve guide and-any wear occurs upon the rivet heads rather than u on themetal of the guide. A suitable stu or bolt P having a nut Q is provided for holding the parts together.

A centering or aligning dowel R preferably secured to the valve seat A is rovided for insuring the proper angular adfiistment of the parts as assembled, and the washer H, the valve guide D, and the stop plate J are each provided with an aperture S th-rou h which the dowel R passes in assembling te parts. The washer H is also provided with a safety dowel T on one side adapted to en :ter the dowel hole U in the valve seat so that if the.,washer H should be placed over the valve interfere'with the proper assembly and indicate that the washer was in the .wrongvplace.

In a valve'xof the type illustrated and derivet construction shown.

In-rivetin the guide arm's F and the valve plate together the rivets are preferably laced at the ends of the ide arms and or this purpose rivet holes are proguide, the safety dowel T- would guide vided in the guide armsadapted to register the heads X of the rivets are made materially larger in diameter than the body por tions or shanks Y' of the rivets. The rivet heads X are preferably. made substantially equal to or greater in diameter than the width of the guide arms F .as illustrated particularly in F igures. 3 and 11 in which the rivet heads X aresubstantially equal in diameter to the width of the valve plate C and project slightly beyond the edges of the guide arm F. This construction as illustrated and described need not be followed in exact detail, since equivalent constructions may be devised for accomplishing the same objects. H v p The guide arms and valve plate are riveted together with the rivet heads on the guide arm side of the valve and the rivet shanks Y are preferably upset sufficiently at a to hold the rivets in position, without, however, appreciably expandin the said rivet shanks in the rivet holes 1n order to avoid initial strain on the metal of the guide arms and valve plate, The heads of the rivets are also preferably provided with reduced cap portions Z affording means for seating the coiled springs 0 over the rivet heads on said reduced cap portions. By this means the sprin s are centered and may be retained on the rlvet heads.

V I claim:

1. A sheet metal valve comprising a cir-. cular valve plate, and a valve guide pr0- vided with curved guide arms having substantially the same radius of curvature as the circular valve plate and riveted to the said plate, the heads of the rivets lying on the valve-guide side of the valve plate being substantially equal to or greater in diameter than the width of the guide arms to afford a substantial bearing surface between the valve plate and the valve guide and to reinforce the said parts in the region at which the rivet hole is formed, the shanks of the rivets extending through the valve plate being materially smaller in diameter than the heads and sufiiciently upset to hold the rivets in position. k

2. A sheet metal valve comprising a valve plate in the form of a ring and a valve guide-provided with a central portion and integral curved guide arms having substantially the same radius of curvature as the valve plate and being thinner and narrower side of the valve plate being substantially equal to or greater in diameter than the width of the guide arms to afford a substan-.

tial bearing surface between the valve plate and the valve guide and to reinforce the said" parts in theregioniat which the rivet, hole is formed, the shanks of the rivets extending through the valve plate being materially smaller in diameter than the heads and sufiiciently upset to hold the rivets in position.

3. A sheet metal valve comprising a valve plate in the form of a ring and a valve guide provided with a central portion and integral curved guide arms having substantially the same radius of curvature as the valve plate and being thinner and narrower than the valve plate, the ends of sai'd 'guide arms being riveted to the valve plate, the heads of the rivets lying on the valve guide side of the valve plate being substantially equal to or greater in diameter than the width of the guide arms to afford a substantial bearing surface between the, valve plate and the valve guide and to reinforce the said parts in the region at which the v rivet hole 'is formed, the shanks of the rivets which extend through the valve plate being materially smaller in diameter than the heads and sufficiently upset to hold the rivets in position Without appreciably expanding the'saidshanks to avoid. strain on the metal of the guide arms and valve plate.

4. A valve comprising a seat, a circular valve plate, a guideprovided with guide arms having substantially the same radius of curvature as the va'lve plate and being vriveted to said valve plate, the heads of the rivets lying on the valve guide side ofthe valve plate being substantiallyequal to or greater-in diameter than the widthof the guide arms, coiled springs seated upon the heads of said rivets, a. stop platehaving guide recesses for-- said; springs, and means for'holding the parts of the valve together.

5. A valve comprising a seat, a circular valve plate, a' guide'provided with guide arms having substantially the same radius of curvature as the circular valvelplate and being riveted to'said valve plate, the heads of the rivets lying on the valve guide side of I the valve plate having fianges substantially e ual to or greater in diameter than the width of the guide arms and also having re-' duced cap portions, coiled'springs seated on returning the valve plate to .its'seat after lifting, astop plate having guide recesses the reduced cap portions of the rivets for for said'springs and mean's'for holding the parts of the valve together.

In. testimony whereof I have signed th1s speciiication FREDERICK masons."

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