US512142A - Hydraulic-pressure-reducing valve - Google Patents

Description

(No Model.) I

W. H. WOOD. HYDRAULIC PRESSURE REDUCING VALVE. N0. 512,142.

Patented Jan. 2, 18.94.

diva

. E:::: I 1 v .GG. v

- INVEN 0R.

ATTORNEYS- wAsummoN D s WITNESSES i UNITED STATES PATENT OFFICE.

YVILLIAM H. WOOD, OF MEDIA, PENNSYLVANIA.

HYDRAULIC-PRESSUR E-REDUCING VALVE.

SPECIFICATION forming part of Letters Patent No. 512,142, dated January 2, 1894. Application filed January 9, 1893. Selial No. 457,849. (No model.)

To aZZ whom it may concern:

Be it known that 1, WILLIAM H. WOOD, a subgect of the Queen of Great Britain, and a resident of Media, in the county of Delaware and State of Pennsylvania, have invented certain new and useful Improvements in H3- draulic-Pressure-Reducing Valves; and I do hereby declare that the following is a full, clear, and exact description of the invention, wh ch will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanymg drawings, which form a part of this specification, and in which- Flgure 1 is a side elevation, in outline, of a hydraul c riveting machine, illustrating the application of mypressrire-reducing valve. F g. 2 1s a side elevation of the valve; and Fig. 3 ma vertical sectional view of the same.

' Llke letters of reference denote corresponding parts in all the figures.

Referring to the said drawings, the reference letter A denotes the casing of a stationary hydraulic riveting machine, which, in this case, has a solid head or end a, and is mounted upon the rigid support or base B, opposite to the fixed anvil-post or hob G, as usual in this style of riveters. J

D 1s the pipe connecting the pressure-reduclng or regulating valve E to the working cyl nder (shown in dotted lines) within the caslng. I

F is a pipe connection leading to the exhaust pipe G fro m the valve-chamber b,which connects on the inside with the exhaust port 1n the cylinder, and H is the pressure pipe leadlng from the accumulator and through which water under a constantand even pressure e. the maximum pressure which obgalns 1n the accumulator) is fed into the cylin- The pipe D, leading from the rear end of the working cylinder, back of its plunger, is. threaded at its outer end and screwed into the threaded inlet cl of a casing M, the other end of which, forming the outlet from said casing, is also threaded as shown at f to receive the upper end or elbow of pipe F, which connects the valve E with the exhaust pipe G. The casing M, has an interior chamber 6, 1n the top of which is an aperture, the upper end ofv which is ground to form a circular seat z' with beveled edges for the valve I, the rim of which is also made sloping or beveled to fit its seat so as to form a water-tight joint when the valve is down or closed. v

J is the valve-stem, which works through a central bore in a cap K, the reduced lower end 70 of which is screw-threaded and screwed into a threaded aperture in the neck m of easing M. a female thread, into which is screwed the lower end of a cylindrical box or casing N, upon the upper end of which is screwed the top cap or cover S, which is provided with a central screw-threaded aperture for the threaded stem or spindle Q, which has a smallhand-wheel g at its upper outer end. In

The upper end of this cap K has.

order to lock or fasten this screw-threaded spindle relative to casing N and its cap or cover S, I provide the latter with a lock-nut T, by tightening down which the spindle may be firmly maintained in its position after proper adjustment. The upper end of the valve-stem J, where this projects into cylinder N, is reduced in diameter, as shown atj so as to form an annular shoulder or seat for a Washer O, which forms the lower abutment or bearing for a coiled spring P, the upper end of which encircles a projection R at the lower or inner end of the screw-spindle Q, taking against an annular flange or disk, 0" on said spindle above its extension R. It will thus be seen that the spring P, operates to press valve I down upon its seat i so as to close communication between chamber 6 and the outlet f,- and further, that the springpressure on the valve may be regulated by adjusting the spindle Q, by the screwing down of which the pressure is increased, while, reversely, the pressure is reduced by turning wheel q in the opposite direction and screwing the spindle up.

From the foregoing description, taken inconnection with the drawings the operation of this device will readily be understood. Assuming that the machine is to be used to its full capacity, 1. 6., with a maximum pressure for riveting thick plates, the spindle Q is screwed down so as to seat the valve with a pressure a little in excess of the maximum pressure of the accumulator, and it follows too that no water will pass out through chamber 6 and valve 1' I into pipe F and the exhaust G; the machine exhausting in the regular manner. But when the riveter is to be worked at less pressure, for riveting thinner plates or analogous work of a lighter character, the pressure within the working cylinder may be proportionately reduced by adjusting the spindle Q so as to relieve the valve from a certain amount of spring-pressure, corresponding to or commensurate with the extent to which the cylinder is to be relieved. For example: if it is desired to work the machine at a pressure, we will say, of only fifty tons (the accumulatorregistering its maximum of seventy-five tons), then all that is necessary to do is to loosen the lock-nut T, screw up the spindle and thus relieve the spring until its pressure against valve I is equal to or counterbalances a pressure of fifty tons on the area of the plunger within the working cylinder of the machine, and then again tighten down the lock-nut so as to maintain the spindle and valve in this adjusted position. It follows that there will now be a constant outflow of water under pressureof twenty-five tons (viz: the excess of pressure, 1'. e. the difference of pressure between the accumulator and the working pressure in the cylinder) through the valvevl I and pipe F into the exhaust. Should it be desired to still further reduce the working pressure, nut T is again loosened and the spindle is raised a little more, relieving spring-pressure on the valve commensurate with the reduction of working pressure within the cylinder, for example,'from fifty to thirty tons, after which the nut is again fastened down as before. The outflow of water through the pressure-reducing valve will now be increased, due to the added excess of twenty tons pressure, .to which extent the working pressure on the plunger has been relieved, and there will be, as long as the machine is operated with a hydraulic pressure of thirty tons, a constant outflow of water from the cylinder into the exhaust ata pressure of forty-five tons, 2'. e., the difference between the working pressure and the pressure on the water in the accumulator. By testing the spring P and devising a scale based on such tests and marked off, for example, on the stem of spindle Q, indicating the amount of relaxation required in the spring in order to effect a given reduction of pressure, the pressure-reducing device may be operated with certainty and accuracy so that the workin g-pressure of the machine may be regulated at will and instantly withoutinterfering with the accumulator or the hydraulic'connections of the machine.

It will be obvious that the detailed construction of the pressure-reducing device may be varied without affecting my method of reducing the working pressure, and I desire it to be understood, therefore, that; I do not con fine myself to any specific construction of this device per 86, although the apparatus herein described will be found inexpensive,

easy in its application and manipulation, and entirely satisfactory in its operation, 7 y

Having thus described my inventiom l claim and desire to secure by Letters Patent of the United States'-. g p p In 'a hydraulic riveting-machine of the character described, the combination of the following elements,viz: the working-cylinder, the valve-chamber b, the inlet-pipe H, exhaust-pipe G, connecting-pipeD, pressure-re ducing valve E having inlet d and outlet f, and discharge-pipe F leadingfro'rn the outlet f to the exhaust G below the valve-chamber; substantially as and for the purpose shown and set forth. v p v In testimony that I claim the foregoing as my own I have hereunto affixed my signature in presence of two witnesses.

WILLlAM 11. wool).

Witnesses:

AUGUST PETERSON; BENNETT S. JONES.

Images