US610479A

US610479A - Valve-check

Info

Publication number: US610479A
Authority: US
Publication date: 1898-09-06
Anticipated expiration: 1915-09-06

Description

No. 6|0.479. Patented Sept. 6,1898. J.. EWAHT- VALVE CHECK.

Application med Feb. 1o, 189e.) (No Model.) 2 Sheets-Sheet I.

N0. 6|o,479.`- Patented sept. 6, |898. J. EwAnT.

VALVE CHECK.

(Applicatinn med Feb. 16,1898.; (No man.) 2 sheets-sheet 2.

WTNEESEE: INVERIDR':

Ja a, @W y @QM M I UNITED STATES ATENT Prien.

JOHN EWART, OF LAWRENCE, MASSACHUSETTS, ASSIGNOR TO THE SHEF- vFIELD CAR COMPANY, OF THREE RIVERS, MICHIGAN.A

VALVE-CHEC K.

SPECIFICATION forming part of Letters Patent N. 610,479, dated September 6, V1898.

Application iiled February 10, 1898. Serial No. 669,'l52. (No model.)

To a/ZZ whom it may concern:

Be it known that I, JOHN EWART, of Lawrence, in the county of Essex and State of Massachusetts, have invented certain new and useful Improvements inValve-Ohecks, of which the following is a specification.

This invention relates to hydraulic and other valve mechanisms in which the liquidpressure in a pipe or main is utilized to operate a main valve located in the pipe by combining the valve with a piston, a. pressurecylinder, and a suitable auxiliary valve mechanism for regulating the supply and exhaust of said cylinder.

The invention has for its object to furnish means for securing a gradual closing of the main valve in a mechanism of the described character; and to this end it consists in a device for crowding or retarding the exhaust from the operating-cylinder, such device being constructed and arranged in a novel manner, which I shall now proceed to describe,

and then point out in the claims hereto appended. f

Of the accompanying drawings, forming a part of this application and illustrating the application of my improvements to the main valve of a water-supply stand-pipe for railroad use, Figure l is a view, partlyin section and partlyin elevation,of aportion of a standpipe and valve provided with my improved retarding mechanism. Fig. 2 is an end View looking from the right in Fig. 1. Fig. 3 is a plan and section on the line 3 3 of Fig. 2. Fig. 4 is a section similar to Fig. l, showing aditferent position of the parts. Fig. 5 is a detail section showing a position of the piston and valve of the hydraulic cylinder. Fig. 6 is a view showing the ports of the hydraulic cylinder and other parts, being afsection on the line 6 G of Fig. 4. Fig. 7 is a detail sectional view illustrating the exhaust from the hydraulic cylinder. Fig. 8 is a detail view showing a position of thehydraulic-cylinder valve on its seat and showing also a reverse view of the valve. Figs. 9 and l0 are sectional views o'n a larger scale than the foregoing, showing different positions of the gatevalve in the retarding mechanism. Fig. 11 is a detail view of a modification referred to hereinafter.

The same reference characters indicate the same parts in all the figures.

Referring to the drawings, a designates the supply-pipe of a stand-pipe A, d designates the main-valve casing, and Z9 designates the main valve for opening and closing the passage through the casing, said valve seating in a partition a2, extending across the waterpassage. v 6o c is a rod or spindle connecting the valve b with a piston c, located within a hydraulic cylinder c2 and having a larger cross-sectional area than the valve b. At one side ofsaid cylinder is a valve-chest d', containing a slide- 65 valve d. The valve is connected by arod cl2 to one end of a lever d3, fulcrumed in a standard d6. The other endof said lever is forked to pass on either side of the pipe A, engaging a grooved ring 17, which slides up and down 7o on said pipe 'and is supported by two vertical rods d8 d8. Longitudinal motion may beimparted to said rods by any suitable operating mechanism, so as to operate the slide-valve d. Such mechanism is familiar on railroad stand-pipes, and, forming no part of my present invention, is accordingly not illustrated in the drawings.` A port e connects the interior of` the valve-chest d with the upper part of the main-valve` chamber, which latter 8o is open to the pipe c, and ports e and e2, opening below and above the'pistonc, connect the interior of vthe valve-chest d with the interior of the hydraulic cylinder c2.

f andf are two exhaust-ports.

The valve d has three positions. In its intermediate or central position (shown in dotted lines in Fig. 1)*the valve covers the openings ofthe two ports c and e2 and the eX- haust-ports ff. When the valve is in this 9o position, no water can pass from the valvechest CZ intothe hydraulic cylinder.

When the valve is in a raised position, as shown in Fig. 4, the ports c e are uncovered and communication is established between the port e2 and the exhaust-portf' by Way of a channel d4 in the valve-face. IVater is thus admitted fromy the pipe d into the hydraulic cylinder c2, belowr the piston c, thereby raising said piston and the main valve b.- The roo water which has remained in the upper por tion of the cylinder after a previous depresthe valve d. An exhaust is also established from the lower part of the cylinder through the port e', a channel d5 in the valve-face, and the exhaust-portf. The effect of placing the valve d in this position is to admit water from the main pressure-pipe c to the upper part of the hydraulic cylinder c2, above the piston c, thereby depressing said piston and the main valve b and iinally closing the latter against its seat. On its downward stroke the piston forces the water which has lled the lower partof the cylinder out th rough the exhaust-port f. y

In valve-operatin g mechanisms of this character it is common to obstruct the exhaust from the hydraulic cylinder during the closing movement of the main valve in order to prevent the pressure ot' the liquid in the pressure-pipe from closing said valve with too great force against its seat. Such obstruction usually consists merely in furnishing a contracted outlet for the liquid, which outlet does not vary during the stroke as to the amount of liquid which passes in a given time. The result of this is that the piston moves just as slowly during the first part of and packed in a suitable manner.

its closing stroke as it does during the last part when the valve approaches its seat, and the valve accordingly takes a long time in closing.

By means of my invention I furnish a device whereby a free exhaust is provided for the hydraulic cylinder during the irst part of the closing stroke of the main valve; but as the valve approacl'ies its seat the exhaustpassage becomes more and more obstructed, until finally a very narrow outlet or none at all is left for the water just as the valve becomes seated. This is accomplished in the following manner: g' is a valve-casing fitted to a pipe g2, which leads from the exhaustport f and containing a gate or valve g, which seats in a tapered socket g3 inside the casing. The valve g is provided with a spindle g4, extending through the top of the casing The said spindle is pivoted to a lever h, which is supported at one end by alink t', attached to the valve-casing, and is provided at the otherend with an elongated slot 71,', Fig. 3. 7c is a rod forming a continuation of the piston-rod c and passing through the top of the cylinder c2. The upper portion of said rod passes through the slot h in the lever h and is provided with adjustable collars or blocks 7c 7o on either' side of the lever h. Vhen the piston c is forced to the top of the cylinder c2, the lever h is raised to the position shown in dotted lines in Fig. l and the valve gis opened wide, as shown in Fig. 9. Then when the valve d is reversed and the piston c begins to descend a free exhaust is at first provided for the water below the piston and the latter descends quite rapidly; but as it descends the lever h is pulled downwardly and the exhaust becomes more and more obstructed, as indicated by the position of the valve g in Fig. l0. The result is that the main valve b closes against its seat without any shock and there is no hammering of the water.

Fig. Il shows a modification in which the lever h is provided with a weight h2 and a single collar 7o is affixed to the rod 7c above the lever. On the upward stroke of the piston the weight moves the lever so as to open the valve g.

Having thus explained the nature of myinvention and described a way of constructing and using the same, although without having attempted to set forth all the forms in which it may be embodied'or all the modes of its use, I declare that what I claim isl. In a valve mechanism, the combination with a main valve and a pressure-cylinder and piston for opening, and closing said valve, of an exhaust-passage leading from the cylinder, and a valve in said passage controlled by the movements of the main valve and piston, and

adapted to obstruct the exhaust-passage during the closing movement of the main valve.

2. In a valve mechanism, the combination with a main valve and a pressure-cylinder and piston for opening and closing said valve, of an exhaust-passage leading from the cylinder, a sliding gate-valve arranged in said passage, and connections between said valve and the operating-piston, whereby the movement of said piston in closing the main valve causes a gradual closing of the gate-valve, as set forth.

In testimony whereof I have signed my name to this specicatiomin the presence of two subscribing witnesses, this 7th day of February, A. D. 1898.

JOHN EWART.

Witnesses:

A. D. HARRISON, PETER W. PEZZETTL v IOO