US166002A - Improvement in steam-valves - Google Patents

Description

2 Sheets--Sheet 1. J.HARL

Steam-Valve.

No. 166,092, Patentedluly 27,1875.

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I\TITED STA'IES TENT J AMES HARE, OF BROOKLYN, NEW YORK.

IMPROVEMENT IN STEAMVALVES.

Specificationformng part of Letters Patent No. 166,002, dated July27, 1875; application filecl May 6,1875.

T0 all whom z't mag; concern Be it known that I, JAMES HARE, of Brooklyn, in the county of Kings and State pf New York, have made an invention of new and useful Improvements in Valve -Move ments; and that the following is a full, clear, and exact description and specification of the same.

The invention has reference to that class of valvemovements in which the main valve, which controls the movements of the main steam-piston of a steam engine or pnmp, is itself operated by steam or other fluid, when a second valve, operated by son1e moving part of the exterior mechanism, moves said second valve, and directs the steam against the main valve, 01 a piston connected with it, at the proper ti1nes.

Tl1e object of my invention is to simplify and condense the parts of said combined valve apparatns, and to render it more effectual and reliable. T0 this end the invention consists in the combination of valves, pistons, and other parts, which combinations are speci- In order that n1y invention may be fully un derstood I have represented it in the accompanying drawings, and will proceed to deseribe it as constrncted by n1e.

Figure 1 represents a top view 0f a steamchest, with the main valve, the secondary valve, the small cylinders and pistons, and the yoke and red, the latter of Which operates the secondary valve, reaching through the steam-chest. Fig. 2 represents a horizontal central section throngh the line 00 90 of Fig. 3, showing the secondary valve removed. Fig. 3 represents a vertical longitndinal centra] section through the line yy of Fig. 1, showing the interior construction of the parts. Fig. 4

represents a transverse section of the main valve, exhibiting the connection of the small exhanst-ports with the main valve-seat at line 2 2 of Fig. 1. 1

A, Fig. 3, is the main "alxe-seat, having three ports, the center one, B, being the exhaustpassage leading to the air 0r con denser, the end ones, 0 O, being, as nsnal, the ports leading to the endsof the main cylinder for the admission and release of the steam alternately as the main piston moves back and forth in the main cylinder. On this valveseat A is a sliding valve, D, its face making a close steam joint with its seat, as usual. It is furnished with two pockets, E E, by means of which the li"e steam from the steam-chest A is passed over to the ports O 0, and the exhaust is passed over 'r0m said ports from the naain cylinder to the central port B alternately. The upper central portion of the main valve is constructed in snch manner as to allow of the placement of a secondary slide-valve, as is shown in Figs. 1, 3, and 4, at F. The ends of the main valve are made cireular, as shown atH H, and extend beyond the valve-face A into the cylin ders 1 I, and reciprocate in said cylinders after the manner ofplnnger-pistons. They are enl'arged,as shown at J J ,where they are of greater diameter than at the ends H H, and when the valve is reciprocated the said ports J J enter the pockets 01 cylinders K K, and confine the steam contained in then1, and coinpress it, so as to cushi0n on it and pre"ent any jar 0r b10w being communicated frorn valve D to the cylinders I 1. G, Fig. 3, is the secondary valve-seat, having three ports, the center one, or, being the exhaustpassage leading to the air 0r condenser. The end ones, b b, are the ports leading to the ends of the cylinders I 1, for the admission and release of the stea1n alternately as the pistons move back and forth in their cylinders. On this valve-seat G is a slide-valve, G, its face making a close steanrjoint with its seat, as usual. It is furnished with a pocket, E, by means of which the exhanst steam is passed 0xer from the ports b b from the cylinders to the centra] port 05 alternately. I 1 are held in relative position With each other by means of flanges n n, or by any other suitable means, so that they may act as one, and they are also prevented from moving endwise in the steam-chest by the same flanges n n, bilt do not hinder them from rising 0r falling with the valve D, up0n which they are hung. The interior of these cylinders is made smooth and ronnd, so that the pistons and the enlargements J J may fit steam-tight, yet can 1110X6 when nnder pressure of steam from the chest.

The valve G is operated by means of a yoke,

rrrcn The cylinders p,and rod p, thlatter of which passes through the paeking-box (1 in the side of the steamchest, and is operated by means of a dog; on the main piston-rod, causing tl1e valve G to recprooate on its valveseat. The main val"e in its operaton earries with it the valve G, and gives tosaid valve a movement that is at right angles to the reciprocating movcment given to the "a1ve by the main piston. This "alve is guided in its movements by slides t t and yoke 19. The "a1ve G Will be readily moved by the rod p when it is tapped by the stops on the pistonrod or other moving part. 'lhe eXhaust-passages a a,leading from the valve G to the valve-seat A, are elongated at their lower portions near said seat, to provide for the motion ofthe main valve, so that they are always in connection with the air 01 exhaust-passage B. At equal distances from the entrance of the exhaust-passages a at valie G are two steam-passmges, b b, leading from the stearn-chest at L to either end of the pistons, so that steam may flow 'xom the chest to the cylinders I I, to act on the pistons H and H alternately.

The operation is as follows: Steam is conducted. from a boiler through suitable pipes to the steam-chest A through the opening T, and, filling tl1e chest, passes into the pocket E, thence through port 0 to the left end of the main eylinder, forcing the main piston tovvard the right, the exhaust-port G being open to allow 'ree communication between the right side of the main piston -With the air through port 0, pocket E, and port B. When the main piston arrives nearthe end of its cyiinder a projeotion, eonnected with valve-rod 12, is struok by a stop connected with said piston, and the va1ve G is moved forward until the passage I) is open, when steam from the chest flows into the cylinder I and against the pistou H, and the cylinder I is open to the exhaust-passage B and the air. The main valve now moves toward the right by the pressure ofthe steam on the head of piston H, and movcs until the port 0 is open to the pressure from the steam-chest, the port B oonncoted with the port G, and the steam shut off from sad port by the lip A coming in line with the bar A. The motion of said. lip is then arrested by the cushion of the steam shut up in the pocket K, as the piston projection J has closed it,so that there is no escape. The cashioning referred to prevents the pistons 'rom striking together when the valve is in use. When the main valve opens port 0 the main piston moves toward theleft. As itapproaehes the end of its stroke it causes the valve-rd 12 to move the valVe G backward, by means like that before described, until the passage b is opencd, when steam from the ohest flows into the cylinder 1, and thus pressure is thrown on the head of piston H. The passage from the cylinder I is now open to the exhaust-passage B and the air, the main valve is moved to the left, as shown in the drawing, Fig. 3, and the main piston is reversed.

Having now u1ly described 1ny invention, what I claim, and desirc to secure by Letters Patent, is

The combination, substantially as hereinbefore set forth, of a main sliding valve, having piston-formed ends, wliich support the c ylin ders, in which they are to be reciproea-ted by steam or other fluid, and. a seoondary valve, which admits and releases the steam into and from said cylinders, also supported by the main valve, andn1ounted at right angles to the axis of the oylinders, arranged to opera te in the wanner and for the purpose set forth.

Witness my hand this 1st day of May, A. D. 1875.

J AMES HARE.

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