US1836740A - Valve gear - Google Patents

Description

Dec. 15, 1931.

H. ALB ERS VALVE GEAR Filed July 23, 1928 Fig. 2

Patented Dec. 15; 1931 UNITED STATES PATENT OFFICE HEINRICH ALBERS, OF DUSSELDORF, GERMANY, ASSIGNOR T SCHLOEMANN AKTIEN- GESELLSGHAI'T, OF DUSSELDORF. GERMANY, A CORPORATION OF GERMANY VALVE GEAR Application filed July 23, 1928, Serial No.

My invention has reference to valves controlling the fiow of water under high pressures. In order to enable the main control valves to be opened by hand, special small auxiliary valves also under the pressure of the water, but which can be operated with out considerable effort, have been provided for permitting the full water pressure to act on the underside of the main control valves thereby relieving the latter and enabling their easy operation. However, if the full water pressure is not required for the working machine connected to the main control valves, then it is impossible to open the main control valves by man-power, because of the excess pressure on top of them, and as a result, the working machine operates imperfectly.

- To overcome this drawback is the object of the present invention, according to which 0 there is provided in combination with the main control valve which is guided above in an annular guide a balanced auxiliary valve provided with pistons passing at the top and ottom outwards through the valve-casing 2 so that as the control lever is operated, only the excess pressure on the auxiliary valve which has been greatly reduced by the said pistons need be overcome, the pressure of the water havin no disturbing reaction on the movement 0 the outer operating parts; also, the auxiliary valves being balanced can be made with a larger cross-sectional area than non-balanced auxiliary valves, and through the larger passage thus obtained, the water flowing through the small space between the annular guide of the main valve and the valve casing can be completely discharged so that in the open position of the auxiliary valve there can not occur any greater water pressure above the main valve than below the same, and the main valve can be manually and positively opened through the continued movement of the auxiliary valve by means of a hand lever.

In the appended drawings, in which I have shown, by way of illustration, an embodiment of my invention, Figs 1 315 a central section through the valve-casing containing the valves, while Fig. 2 is a top plan view of the same.

294,778, and in Germany August 4, 1926.

In the drawings, 1 is the supply-pipe for the water under pressure to the valve-casing. 2 is the pipe conducting the water to the working machine, and 3 is the waste-pipe.

4 is the hand-lever for operating the valves. 5 is the inletvalve, and 6 the outlet-valve. 7 is the valve-casing containing both valves and resting on a support 8, in which is ournalled the operating shaft 9 of the control mechanism. 10 is a double cam-lever. The latter and the hand-lever 4 are secured to shaft 9. 11 are bolts guided in the support 8 and normally bearing on the two cams of cam-lever 10. The length of the said bolts can be adjusted by adjustable nuts 12, whereby the opening of the valves may be varled. 13 and 14 are the balanced auxiliary valves which close the central openings in the inlet and outlet-valves 5 and 6 and which are guided above and below in the valve-casing by means of balancing pistons 15 and 16 of equal cross-section which pistons pass through gaskets 17 to prevent any leakagte. The said auxiliary valves 13 and 14 are su jected to the pressure of compresslon springs 18 hearing against collars on said plstons 15 and against the inner ends of cylindrical housings 19 secured to the valve-casing 7 When the hand-lever 4 occuples a vertlcal position, both the inlet" and outlet-valves 5 and 6 respectively are closed, and between the nuts 12 on the bolts 11 and the balancing p1stons 16 there is a slight play.

Now, when the hand-lever 4 is moved from its central position toward the r1 ht 1n Fig. 1, the left-hand cam on the camever 10, by means of the bolt 11 and the piston 16, opens the auxiliary valve 13. During t h1s operation, the pressure of the compresslon SPIlIl 18, the friction of the gaskets 17 and especla ly the water pressure acting on the annular face formed by the difference of the circular face of valve 13 and the balancing piston 15, must be overcome. Because of the opened valve 13 which is guided in the valve-casing at the top and bottom by the pistons 15 and 16 of equal thickness, the pressure of the water in the space above inlet-valve 5 and the auxiliary valve 13 will be the same as the pressure in the space below the same, so that both said 100 valves are balanced. When the auxiliary valve 13 is raised still further, the inlet-valve 5 is positively lifted from its seat allowing water under pressure to flow into the pressure cylinder of the working machine.

After the stroke of the workingmachine has been completed, the hand-lever 4 is oved back to its vertical position, and with t e said lever'are also positively moved the parts 9, 10, 11 and 12. The tensioned spring-18, therefore, now returns the inlet-valve 5 and the auxiliary valve 13 to their seats, and the water flowing through the narrow space 20 between inlet-valve 5 and its-cylindrical guide into the space above the valves will tightly seal said valves on their seats. a en the water is to be discharged, the hand-lever 4 is moved toward the left in Fig. 1 in the osition as shown in said figure, whereby the outlet-valve 6 is opened, the operation being exactly the same as with respect to'the inlet-velvet.

While I have illustrated my invention in detail, I do not, of course, thereby limit myself to the exact construction as shown, since various modifications may be introduced without a departure from the essence of the invention.

I claim:

1. A valve for controlling the flow'of liquid under hi h pressure comprlsing a casing having a valgve chamber, said casing also having inlet and outlet assages communicating with said valve cham er at the side and end there of, respectively, a valve seat surrounding said' outlet passage, a main control. valve within said valve chamber movable to a closed posi tion against said seat and to an open position spaced from said seat, means for theadsaid outlet passa e, a main control valve within said valve 0 amber movable to a closed position against said seat and to an open position spaced from said seat, said valve chamber being of greater cross sectional area than said valve whereby when the valve is closed the end thereof remote from the valve seat is subjected to the pressure of the. liquid, the respective ends of said valve being of substantially e ual area whereby when the valve is open the same is substantially balanced by the pressure of the liquid acting against the respective ends thereof, said main valve having a passage therethrough, an auxiliary valve controlllng said passage, means whereby opening and closing movements of,

said auxilia valve positively impart opening and closing movements, respectiveliyr, to said main valve, valve stems extending om said auxiliary valve beyond the. respective ends of said main valve and slidable into guide bores in the valve casing, said valve stems being of substantially equal cross sectional area where theyare slidable in the bores in the valve c'asin whereby the auxiliary valve is substantia ly balanced by the pressure'of the liquid acting against the respective ends thereof when said valve is opened, means whereby the ends-of said valve stems are exposed to the atmosphere whereby the auxiliary valve .,is substantially unre-' strained in its opening and closin movements, and means for opening an closing said auxiliary valve.

In testimony whereoiihIa aflix my signature. HEI

ICH ALBERS.

mission of liquid at all times to the end of I spective ends of said valve being of substantlally equal 'areawhereby the valveis substantially balanced by the pressure of the liquid acting against the ends thereof when the valve is opened, said main valve having a passage therethroughoand a valve seat surrounding said passage, an auxiliary valve for cooperation with said seat, means whereby the liquid pressure substantially balances the auxiliary valve when the same is opened, means whereby o ening and closing movements of the auxi iary valve are effective to positively impart opening and closing movements to the main valve, respectively, and means for opening and closing said auxiliary valve.

2. ll valve for controlling the flow of liquid under high pressure comprlsing a casing having a valve chamber, said casing also hav-- ing inlet and outlet passages communicating with said valve chamber at the side and end thereof, respectively, a valve seat surrounding

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