US1922064A - Valve - Google Patents

Description

Aug. 15, 1933.

C; J. WESTLING VALVE Filed March 4, 1931 3 Sheets-Sheet 1 Aug. 15, 1933. c, J. WESTLING 1,922,064

VALVE Filed March 4, 1931 3 Sheets-Sheet 2 32 am, yam/16W I Patented Aug. 15, 1933 UNITED STATES PATENT orrics VALVE Carl J. Westling, Chicago, Ill.

Application March 4, 1931. Serial No. 520,016

9 Claims.

My invention relates to valves, particularly to gate valves such as are employed in connection with coke oven gas, producer gas, blast furnace or any other noxious gas mains or conduits for the purpose of shutting off the flow of gas to connected apparatus such as gas holders, gas washers or the like.

It is well known that where these valves are employed it is desirable that the gas have free passage to the connected apparatus when the valve is open, and when the valve is closed it is desirable to prevent leakage of the gas past the valve and to the connected apparatus, which leakage presents great danger to workmen or others at the apparatus.

My present invention provides for ventilating the valve casing when the valve is closed so that in case of any leakage at the valve at that time this leakage will be discharged from the valve casing and will not pass to the connected apparatus.

My present invention further provides for embodying the above feature in standard types of valves now in use without material alteration and at a minimum expense.

.ment of the two aligned or opposite ventilating openings in the valve casing provides for a cross flow or cross current of air through the casing, which materially augments ventilation and effectively carries the gases away from the valve casing, thereby further assuring against passage of gas to the connected apparatus when the valve is closed.

My present invention provides for disabling or rendering ineffective the ventilating means, and more particularly for closing the ventilating openings when the valve is open so that the gas will pass through the valve casing and gas main to the connected apparatus without discharge or loss at the valve.

My invention further provides for minimizing discharge or loss of gas to atmosphere by way of the ventilating means at the valve casing in the intermediate positions of the valve member between closed and open positions, that is, in operating the valve member from closed to open position and vice versa.

lViy invention also provides for automatically rendering the ventilating means efiective by the closing of the valve, and for automatically rendering the ventilating means ineiiective by the opening of the valve, the ventilating openings of the illustrated embodiment being automatically opened by the closing of the valve and automatically closed by the opening of the valve.

Still further features reside in the expanding lever and wedge arrangement for seating the valve discs upon the main valve seats and upon the ventilating opening seats, the manner of fulcruming the valve discs in expanding said discs to the ventilating openings seats, as well as to the main valve seats, and the manner of releasing the iulcruming action to free the valve discs from both the ventilating opening seats and the main valve seats ahead of the movement from position between the ventilating opening seats to position between the main valve seats, and also ahead of the movement of these valve discs from position between the main valve seats to position between the ventilating opening seats.

My invention is illustrated in the accompanying drawings in which:

Figure 1 is a side elevational view partially in section of one form of valve embodying my present invention;

Figure 2 is a vertical section taken on the line 2-2 of Figure 1;

Figure 3 is a detail section taken on the line 3-3 of Figure 2;

Figure 4 is a detail section taken on the line 4-4 of Figure 2;

Figure 5 is a diagram showing in full lines the valve discs seated upon the main valve seats and in dotted lines the manner in which these valve discs are freed from the main valve seats ahead of the actual lifting of the valve discs to open position;

Figure 6 is a diagram similar to Figure 5 showing the valve discs in intermediate position;

Figure 7 is a diagram similar to Figure 5 showing in full lines the valve discs seated upon the ventilating opening seats and in dotted lines the manner in which these valve discs are freed from these seats ahead of actual movement of the valve discs to position between the main valve seats; and

Figure 8 is a view partially in elevation and partially in section showing an arrangement for use where the valve is disposed inside.

The usual gas conduit or main is indicated at 5. It may be composed of any number of sections secured together in any well known manner. The two sections shown in the drawings are separated to receive the valve casing 6 between them, the valve casing 6 having flanges 7 and the adjacent ends of the conduit sections 5 having flanges 8 V to which the flanges 7 are bolted or otherwise secured at 9. The openings 10 and 11 constitu main valve openings and in the illustrated embodiment register with each other and ith the bores of the conduit sections 5, there being main valve seats 12 surrounding the inr r ends oi the openings 10 and 11 which seats are in opposition within the casing and are spaced apart to ceive'the valve discs 13, expanding levers 14, cage 15, the lower endor" the valve stem 16 and other parts'between them.

The interior 17 of the valve casing 6, which casing comprises the main casing part 18c and the supplemental casing or bonnet part 181 bolted or otherwise secured thereto, is closed except-for the openings and 11 and a pair of ventilating openings indicated at 19 and 2c. The entry or" the valve stem 16 is provided with L ..d packed at 22 to seal the valve casing against the escape of along the valve stem. stem 16 has a threaded extension 23 in threaded engagement at 24 with a collar 25. The collar 25 is fixed against movement axially of the stem 16 in the upper end oian arched frame 26, which frame 26 is secured at 27 to the valve casing 6. The collar 25*has fixed thereon to turn the collar 25 with it, a hand wheel 28 by means of which the collar is'turned to'raise and lower the stem 16 through the threaded engagement therewith. The frame 26 is of split construction clamped at 29 about the collar 25'which collar has a flange 30:underly ing the adjacent portion of the frame 26, there being a thrust bearing 31 between the hub 32 of the hand wheel 28 and the adjacent portion of the frame 26 and locknuts 33 being provided for holding the collar 25 in place in the frame and the hand wheel 28 thereon.

The valve discs 13 have cuter annular ats E i engageable with the main valve seats 12 upon positioning the valve discs between the seats as shown, and these discs 13 have inner annular seat's'35 engageable when the valve discs are in position between theventilating openings 19 and 20 as shown in Figure 7, with seats 36 surrounding the inner ends of the openings 19 29.

The cage 15 isdisposcd between the valve discs 13'and has a collar 37 rigidly secured at 38 up n the lower end of the valve stem 16; interposed between the opposite sides or" the cage 15 and the respective discs 13 the expanding levers '14 each of which has an integral stud 40 eng sing a recess 41 at the axis of the adjacent di.

J the c and having rocking contact at l2 to permit fr fulcruming of the valve discs to their respective seats. In the upward movement of the valve stem 16 engagement of the flange 45 on cage 15 with the lower ends of levers 14 raises the valve discs 13 from position between the seats 12 to pcsition' between the seats 36, and in the downward movement of the stem the 43 on the cage 15 by engagementwith shoulders .7 on the levers '14 movesthe valve discs 13 from position between the seats 36 to position between the seats 12';

Means operative at the opposite limits or" movement of the valve discs 13 expand these discs to engage the seat 34 with the seats when the discs are between the openings 10 and 11 and the seats 35 with the seats 36 when the valve discs are in position between the ventilating cpentags 19 and 20. The means expanding the discs to the seats 12 comprises a bottom expanding plug 49 l aving a tapered upper end 50 which engages correspondingly tapered shoulders 51 on the levers 14; at the lows limit of movement of the discs 13. The plug 49 has a plate 52 bolted Figurover the expanding plug opening 53 at the bottom of the valve casing.

The expanding means at the opposite limit of movement of the discs 13 comprises an expanding plug 54 tapered at 55 and in the illustrated embodiment formed integral with the gland 21. The engagement of the flange 46 with the shoulders r? is preferably rounded to form a fulcrum for the valve discs when the bottom expanding plug is operative, and the engagement of the flange 45 with the lower ends of the levers 14 is likewise preferably rounded to form a fulcrum for the valve discs 13 when the top expanding plug 54 is operative. As shown in Figure 2, the flange 45 is spaced below the lower ends of the levers 1 1, the cage 15 having movement relative the levers 1i and discs 13 an amount equal to the distance of the flange 45 below the lower ends of the levers 14 at each limit of movement of the valve discs to permit release of the expanding means and freeing of the valve discs from the main and ventilating opening seats ahead-of themovernent of the discs from position between each pair of seats 12, 36 to position between the other pairof seats.

Referring now to Figure 2 and the diagrams of Figures 5, 6 and 7, the operation of the valve as follows:

Assuming that the discs 13 are seated uponthe main valve seats at 12, the valve is closed and rior of the valve casing 6 and willbe eifectively' carried away to atmosphere by thecr'oss-fl'ow of through. the ventilating openings 19 and 20. In order to open the valve the hand wheel 28 is turned to raise the stem 16, the initial raising movement of the stem lifting the'cage 15 with it and freeing the fulcrum engagement at 46, 4'7 which frees the valve seats 34 from the seats 12, permitting the valve discs to-retract away from the seats 12, as shown in dotted lines in Figure 5, before the actual lifting of the valve discs toward the upper or open position. When the 45 engages the lower ends of the levers 14- continued upward movement of the stem lifts the valve members to position between the openings 19 and 20, in which position the inclined surfaces 50 on the levers 14 engage the upper exduits 5 and at this time the valve discs 13 close engage the seats 35 thereof with the ventilating opening seats 36. In this position the valve is open for the free flow of gas through the conduits 5 and at this time the valve discs 13 close the ventilating openings 19 and 20 against discharge or loss of gas to atmosphere through these openings.

With the valve open and the ventilating openings 19 and 120 closed, as shown in the diagram of Figure 7, in order to close the valve the hand wheel 28 is turned to lower the stem 16. The

initialdownward movement of the stem frees the I flange 25 from the lower ends of the levers l4 and thereby the fulcrum about which the valve discs fulcrum to the seats 36 permitting the valve discs to free or retract themselves from the seats as shown in dotted lines in the diagram of Continued downward movement of the engages the flange 16 with the shoulders the openings 10 and 11 in which position hese valve discs are expanded to the seats 12 by iii) engagement of the plug with the tapered shoulders 51 on the levers l4.

The intermediate retracted positions of the valve discs in their movement from position between the main valve seats to position between the ventilating openings and. in their movement from position between the ventilating openings to position between the main valve openings is illustrated in the diagram of Figure 6. An opening 62 in the bottom of the cage 15 is freely movable over the plug 49 at the lower position of the valve cage.

For the purpose of preventing or reducing the escape of gas from the main or conduit 5 through the ventilating openings 19 and 20 during movement of the valve from closed to open position and vice versa, the cage 15 is provided with baifle arms 65 which form obstructions or barriers between the openings 10 and 11 and the openings 19 and 20. These bafile arms 65 preferably extend out to the sides of the casing with their outer ends 66 engaged in guides 67 in the casing, thereby eliminating any tendency of the twisting action on the stem to be transmitted to the disc seats which might cause binding and wear on them when operating the valve. The baffle arms 65 while forming barriers between the openings 10 and 11 and the openings 19 and 20 have adequate freedom within the valve casing so as not to impair or interfere with movement of the valve discs from either position to the other. The valve casing 6 may be enlarged at 68 (Fig. 1) to permit free passage of any gas remaining in the lower part of the casing when the valve is closed, around the bailie arms 65 and out through the ventilating openings.

When the valve is arranged inside, as shown in Figure 8, the valve casing 6 may be ventilated to atmosphere by a flue '70 connected to one of the ventilating openings 19, 20' and extending up to atmosphere at the outside of the building 71 at 72. In this case the other ventilating opening 19', 20' is connected to the outside by a conduit '73, the gas conduits being indicated at 5'. Ventilation might, of course, be further augmented by providing means for blowing or drawing the air out through the flue 70.

In Figures 1, 2 and 3 lugs on the cage 15 cooperate with the levers 14 to maintain these parts properly positioned with respect to each other.

It is to be understood that the valve discs 13 may be expanded in other ways than the particular manner shown. Different manufacturers have difierent ways of expanding these valve discs, the particular arrangement shown being for purposes of illustration of the present invention and it is to be understood that other changes in the particular details shown are contemplated within the scope of the appended claims.

I claim:

1. In combination, a valve casing having a main valve opening adapted for connection in a conduit, and a valve adapted for closing said opening and movable to open position, said casing having means for ventilating the same when said valve is closed, said ventilating means comprising an opening adapted to be closed by said valve in its open position with respect to said main valve opening.

2. In combination, a valve casing adapted for connection in a conduit and having a pair of opposite main valve openings, opposed main valve seats for said openings, said valve casing having a pair of opposite ventilating openings, opposed seats for said ventilating openings and valve means movablefrom position between the main valve seats to position between the seats for the ventilating openings and vice versa, said. valve means being engageable with the main valve seats to close the main valve openings in one position and being engageable with the seats for the ventilating openings to close said openings said main openings are open.

3. In combination, a valve casing adapted for connection in a conduit and having opposite openings adapted for placing the conduit on one side of the casing in communication withthe conduit on the other side of the casing, valve seats for said openings, ventilating openings in said casing, valve seats for said ventilating openings, a pair of valve discs movable from position between said first valve seats to position between said second valve seats and vice versa, and means for expanding said valve discs into engagement with the adjacent valve seats in each of said valve disc positions.

4. In combination, a valve casing having opposite main valve openings provided with opposed main valve seats, said casing having opposite ventilating openings provided with opposed ventilating opening seats, a valve stem entering the casing, a pair of valve discs carried by said stem and movable from position between the main valve seats to position between the ventilating opening seats and vice versa, expanding means for said discs and means engageable with said expanding means at one limit of movement of the valve discs for expanding said discs to the main valve seats and at the other limit of movement of said discs for expanding the discs to the seats for the ventilating openings.

5. In combination, a valve casing having opposite main valve openings provided with opposed main valve seats, said casing having opposite ventilating openings provided with opposed seats, a valve stem entering the casing, a pair of valve discs carried by said stem and movable from position between the main valve seats to position between the ventilating opening seats and vice versa, means operative at one limit of movement of the valve discs for expanding said discs to the main valve seats, and means operative at the other limit of movement of the valve discs for expanding said discs to the seats for the ventilating openings.

6. In combination, a valve casing having opposite main valve openings provided with opposed main valve seats, said casing having opposite ventilating openings provided with opposed seats, a valve stem entering the casing, a pair of valve discs carried by said stem and movable from position between the main valve seats to position between the ventilating opening seats and vice versa, means operative at one limit of movement of the valve discs for expanding said discs to the seats for ventilating openings, and a pair of fulcrums for said valve discs one operative when said first expanding means is operative and the other being operative when the other expanding means is operative.

'7. In combination, a valve casing having opposite main valve openings provided with opposed main valve seats, said casing having opposite ventilating openings provided with opposed seats, a valve stem entering the casing, a pair of valve discs carried by said stem and movable from position between the main valve seats to position between the ventilating opening seats and vice versa, means operative at one limit of movement 4- ma ma of the valve discs for expanding said discs to the main valve seats, means operative at the other limit of movement of the valve discs for expanding said discs to the seats for ventilating openings, a pair of fulcrums for said valve discs one operative when said first expanding means is operative and the other being operative when the other expanding means is operative, and means for releasing each of said fulcrums and .the valve seating action ateach of the opposite limits of movement and before actual movement of the valve discs to the other position of said discs.

8. In combination, a valve casing having opposite main valve openings provided with op posed main valve seats, said casing having opposite ventilating openings provided with opposed ventilating opening seats, a valve stem entering the casinga pair of valve discs carried by said stem and movable from position between the main valve seats to position between the ventilating opening seats and vice versa, a bottom expanding plug secured to the casing for expanding the valve discs into engagementwith the main valve seats, a packing. gland for said stem, and an expanding plug on said packing gland for expanding the valve discs to the seats for the ventilating openings.

'9. In combination, a valve casing having opposite main valve openings provided with opposed main valve seats, said casing having opposite ventilating openings provided with opposed ventilating openings seats, a valve stem entering the casing, a valve cage on said stem, a pair of expanding levers carried by said .cage,'a pair of valve discs carried by said levers and movable from position between the main valve seats 'to position between the ventilating opening seats and vice versa, means operative at one limit of movement of the valve discs for expanding said discs to the main valve seats, means operative at the other limit of movement of the valve discs for expanding said discs to the seats for ventilating openings, a pair of fulcrums for said valve discs one operative when said first expanding means is operative and the other operative when the second expanding means is operative, and means on said valve cage engageable with said levers for moving the valve discs from one position to the other, said cage having movement relative said levers to permit release of each of said expanding means and freeing of the valve discs from the main and ventilating opening seats ahead of movement of said discs from one position to the other.

CARL J. WESTLING.

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