US406012A - Valve for compound engines - Google Patents

Description

(No Model.) 2 Sheets-Sheet 2. S. M. VAUCLAIN.

VALVE FOR COMPOUND ENGINES.

No. 406,012. Patented June 25, 1889.

/ ii I W 2 I l I UNITED. STATES PATENT OFFICE.

SAMUEL M. VAUCLAIN, OF PHILADELPHIA, PENNSYLVANIA.

VALVE FOR COMPOUND ENGINES.

SPECIFICATION forming part of Letters Patent No. 406,012, dated June 25, 1889.

Application filed March 22, 1889. Serial No. 304,322. (No model.)

To all whom it may concern:

Be it known that I, SAMUEL M. VAUCLAIN, a citizen of the United States, and a resident of Philadelphia, Pennsylvania, have invented certain Improvements in Valves for Cour pound Engines, of which the following is a specification.

The object of my invention is to provide a compound engine with a single valve common to both the high and low pressure cylinders, the valve having been especially design ed for use in connection with compound locomotiveengines, but being applicable to stationary or marine engines as well.

In the accompanying drawings, Figure 1 is a longitudinal. sectional viewof the valve and "alve-chest. Fig. 2 is a transverse section on the line 1 2, Fig. 1, showing not only the valve, but also the high and low pressure cylinders in section. Fig. 3 is a similar section 011 the line 3 4, Fig. 1. Fig. 1 is a similar section on the line 5 (5, Fig. 1; and Fig. 5 is a similar section on the line 7 S, Fig. 1.

A is a casting containing the high and low pressure cylinders B and D and the valve chest E. The casting, as shown, forms part of a locomotive-engine, :0 being the steam-inlet passage, and 1/ the exhaust-passage; but it will be understood that other forms of castings may be used, as the different character of the engine or other circumstances maysuggest.

In the valve-chest E is a bushing e, slotted or perforated at the inlet and outlet ports, as shown, to permit the steam to enter and haust from the valve-chest.

F is a hollow piston-valve having a highpressure exhaust-passagefextendingbetween openings u a in said valve, said openings communicating with external grooves l) b in the periphery of the valve. The valve is also grooved externally at the center 0, the groox es forming passages for the steam, as described hereinafter. The steamsupply ports (Z d communicate with the steam-passage .1, Fig. 2, these ports being situated at the extremes of the valve-chest, as shown in Fig. 1.

Ports h h communicate with the opposite ends of the high-pressure cylinder, as shown in Fig. 3; and serve alternately as induction and eduction ports for said high-pressure cyl" inder,[ L" being the corresponding ports for the low-pressu re cylinder, as shown in Figs. 1 and 1-, and j is the final exhaust port communicating with the exhaust-passage? as shown in Figs. 1 and 5.

A valve rod F is connected to the valve F, and passes through a stufling-box in the head of the valve-chamber, as shown in Fig.1, for connection to any suitable valve-gear. Vhen the valve is moved in the direction of the ar row 1, Fig. 1, so as to uncover the port h, the port h is in communication with the groove 1), the port L. with the groove and. the port i with the groove 1) of the valve; hence steam passes from the supply-port (Z through the port 71. to the rear end of the high-pressure cylind er, while steam is exhausted from the front end of the said cylinder through the port h, through the groove 1), port a, passage f, port a, and groove 7) of the valve, and through the port 1' to the rear end of the low'pressure cylindcr D, the steam exhausting from the front end of the low-pressure cylinder through the port i, groove and port j to the exhaust-pas sage y.

\Vhen the valve is moved in the direction of the arrow 2, highpressure steam from. the supply-port d passes through the port 7L to the front end of the high pressure cylinder, steam passing from the rear end of the same through the port 7L, valve, and port t to the front end of the lowpressure cylinder, and steam escaping from the latter through the port 1, groove 0, and portj to the exhaust. By the above-described means I am enabled with a single valve to control. the admission of steam into the high and low pressure cylinders, and by making the valve hollow or with a passage through it I am enabled to restrict the size of the valve and chest and provide comparatively straight and short passages for the steam.

I claim as my inventiou-- 1. The combination, in a valve structure for compound engines, of the valve-chest having supply-ports, high pressure induction and ednction ports, low-pressure induction and eduction ports, and final exhaust-port, with a hollow valve having an internal passage pro viding communication between the highpressure ports and the opposite low-pressure internal passage connecting opposite high and low pressure ports, and a passage connecting the latter ports and the exhaust-port, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

SAMUEL M. VAUOLAIN. \Vitnesses:

WM. RHODES, FRANK H. MASSEY.

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