US767498A - Steam-actuated valve. - Google Patents

Description

No. 767,498. PATENTED AUG. 16, 1904. L. PIOARD & G. BUREAU.

v STEAM AGTUATED VALVE.

APPLICATION FILED DEG.7, 1903.

s SHEETS-SHEET 1'.

N0 MODEL.

6/" Para/d Witnesses:

Attorneys No. 767,498. I PATENTED AUG. 16, 1904. L. PICARD & G. BUREAU.

STEAM AGTUATED VALVE.

APPLICATION FILED DEG.7. 1903.

' 3 SHEETS-SHEET 2 no MODEL.

Inventors 0/ Pa 'c'a Wald zedbasfluream Attorneys Witneses:

No. 767,498. PATENTED AUG. 16, 1904. L. PIGARD & G. BUREAU.

STEAM AUTUATED VALVE. APPLICATION rum) no.7, 1903.

3 SHEETBBHBET 3.

N0 MODEL.

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799 6 2* F1660 70 aada'ws Inventors Witnesses:

Attorneys UNITED STATES Patented August 16, 1904.

PATENT @rrrcn.

LEGER PICARD AND GAUDIAS BUREAU, OF ST. ROCH DE QUEBEC, CANADA.

STEAM-ACTUATED VALVE.

SPECIFICATION forming part of Letters Patent No. 767,498, dated August 16, 1904.

Application filed December '7, 1903. Serial No. 184,063x (N0 model.)

To all 1072.071 it may concern:

Be it known that we, Lnenn PIOARD and GAUDIAS BUREAU, sub ectS of the King of Great Britain, residing in St. Roch de Que-v bec, Quebec city, East, in the Province of Quebec, Canada, have invented certain new and useful Improvements in Steam-Actuated Valves; and we do hereby declare that the following is a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

Our invention relates to pumps, and especially to those types employing a'reciproeating piston moving in a cylinder.

The invention contemplates the reciprocation of the pump-plunger through the medium of a piston working in a steam-cylinder; and the object of the invention is to provide improved automatic means for reciprocating the plunger, one of the aims of the invention being to simplify the mechanism so as to dispense with the necessity for external mechanism for actuating the valve which controls the steam distribution in the steam-cylinder.

The invention contemplates the employment of two valves, which are disposed with their axes substantially at right angles to each other, and one of these valves directly controls the admission to the steam -cylinder, while the other valve controls the movement of the last valve, and this other valve is itself controlled automatically from the steam-cylinder. From this arrangementit follows that the valves operate automatically,being thrown or reciprocated solely by the action of the steam and without any mechanical parts whatever.

The invention consists in the construction and combination of parts to be more fully described hereinafter, and definitely set forth in the claims.

In the drawings which fully illustrate our invention, Figure 1 is a longitudinal vertical section through the axis of a steam-cylinder. showing the valves also in section. Fig. 2 is a vertical central section taken substantially on the line 2 2 of Fig. 1. Fig. 3 is a side elevation of the upper portion of the steam-cylinder shown in Fig. 1, one-half of this figure being represented in section. Fig. at is an end elevation showing the upper portion of the steam-cylinder, one-half of this figure being a central section. Fig. 5 is a horizontal section taken substantially on the line 5 5 of Fig. 4:. Fig. 6 is a perspective of the main valve, showing especially the under face thereof. Fig. 7 is a perspective of an auxiliary or pilot valve.

Throughout the drawings and specification the same numerals of reference denote like parts.

Referring more particularly to the parts, 1 represents the body of the cylinder, to which are attached suitable heads 2 and 3, through the latter whereof passes a piston-rod 4, the extremity whereof carries a head 5, as shown. The upper portion of the body 1 is provided with live-steam ports 6 and exhaust-steam ports 7, and these ports open out upon a face 8, upon which is bolted a main steam-chest 9. The steamchest 9 is provided with a bore 10, the axis whereof is disposed substantially parallel with the axis of the steam-cylinder body 1. The ends of this main steam-chest are closed by suitable heads 11, as shown.

. Above the main steam-chest 9 there is formed an auxiliary steam-chest 12, the same having a bore 13, the axis whereof is disposed substantially at right angles to the axis of the bore 10, and the ends of this valve-chest are closed by suitable heads 14, as indicated. In the wall of the auxiliary steam-chest 12 there is provided an inlet-port 15, which passes completely around the upper side of the auxiliary steam-chest, as shown, and communicates with the interior of the main-valve chest or valvecylinder 9, as shown. Steam is admitted to this inlet-passage through a suitable pipe 16, attached in a boss 17 at the upper side of the auxiliary steam-chest, as indicated. Through 19, which valve consists of a hollow cylinder having integral heads, as shown, the wall of the said valve being provided on its upper side with an opening 20, which communicates with the aforesaid opening 18, so that live steam is always contained within the interior of the pilot-valve, as will be readily understood.

IVithin the main-valve chest or valve-cylinder 9 there is mounted a main valve 21, which valve also consists of a hollow cylinder having integral heads, as shown, and the interior of this valve is constantly filled with live steam by reason of openings 22, which are formed in the upper side of the valve and which are in communication with the extremities of the inlet-port 15, whatever be the positionof the valve.

Between the exhaust-ports 7 of the body 1 there is located a main exhaust-outlet 23, which opens out upon the face 8 in a manner usual in steam-cylinders of this type. On the under face of the main valve 21 and substantially at its middle there is formed an exhaust-pocket 24, which pocket when the valve is in either of its extreme positions may open communication through one of the exhaust-ports '7 and through the main exhaust-outlet 23. It being understood that this valve reciproeates during the operation of the pump, it will be readily seen that the ends of the cylinder-body 1 may alternately open to exhaust through the medium of the pocket 24. Near the extremities of the main valve 21 through its lower wall are formed ports or openings 25, which may communicate,respectively, with the inlet-ports 6, so'that steam may be admitted alternately to opposite ends of the steam-cylinder, as will be readily understood.

Arrangement is made whereby the pilot- 1 valve 19 controls the movements of the main valve 21. To this end admission- ports 26 and 27 are formed longitudinally in the wall of the valve-chest 9, the said ports communicating, respectively, with the interior of the valvechest 9 at the extremities thereof. These ports 26 and 27 are preferably located on opposite sides of the axial line of the steam-cylinder, as indicated most clearly in Fig. 5, and at their inner extremities they open upon the bore 10 1 of the main-valve chest, as will be readily understood. Through the wall of the main valve 21 steam- ports 28 and 29 are provided, which ports may communicate, respectively, with the ports 26 and 2'? when the valve is in its extreme positions. As indicated in Fig. 5, the opening 28 is making communication through theport 26, so that steam could pass from the interior of the pilot-valve 19 to the end of the valve-chest 9.

In an opposite relation with respect to the admission- ports 26 and 27 exhaust-ports 30 and 31 are provided, the same being disposed longitudinally in the wall of the mam-valve chest in a manner very similar to the ports 26 and 27. These ports incline upwardly near their inner extremities, as indicated most clearly in Fig. 3, and open out upon the bore 13 of the pilot-valve chest 12, and adjacent to the points at which they pierce the bore laterally-disposed ports 32 and 33 are arranged, which ports have vertical extensions 3 1 and 35, which pass substantially vertically clownward through the body of the main-valve chest, communicating, respectively, with inclined ports 36, which lead to the main exhaust-outlet 23. ()n the under face of the pilot-valve 19 there are provided a pair of exhaust- pockets 37 and 38, and when the pilotvalve is in its extreme position these pockets may open communication for exhaust. Thus, as indicated in Fig. 5, the pocket 38 is represented as opening comm unication between the ports 31 and 32, so that exhaust may take place from the corresponding end of the steam-cylinder. If the pilot-valve were in its opposite extreme position, the pocket 37 would open communication between the ports 30 and 33, so that exhaust would be taking place from the opposite end of the cylinder, as will be readily understood. From the arrangement described it follows that if the pilot-valve 19 were reciproeated between its extreme positions it would operate to admit steam alternately to opposite ends of the main-valve chest, at the same time alternately opening the ends of the said main-valve chest to exhaust.

Arrangement is made whereby the steam in the steam-cylinder 1 may be admitted to the pilot-valve chest after the piston 5 has reached.

l a certain point in its stroke in order to operate or throw the pilot-valve. For this purpose pilot-ports 39 and 4C0 are provided, disposed substantially as shown. The pilot-port 39 comprises sections 39 and 39, which sections open out upon the bore 10 at adjacent points, as indicated, the section 39" passing l upwardly and communicating with one extremity of the pilot-valve chest. In like manner the pilot-port 4C0 comprises sections 10 and LO", which sections are similar to the sections of the port 39, the section 410 communicating with the opposite end of the pilotvalve chest. In the outer face of the main l valve 21 pilot-pockets 11 and 42 are formed.

When the main valveis in one extreme position, the pocket 41 opens communication between the sections 39 and 39" of the pilot- 1 port 39. Similarly when the main valve is i in its opposite position a pocket 42 opens 1 communication between the section 10" and i the section 40 and the pilot-port 4L0, and the 1 arrangement is such that when eommunication is opened through the pocket 11 coml munication is shut off through the pocket 42, l so that when the port 39 is open continuously I to the pilot-valve the port 40 is closed, and

vice versa. The pilot- ports 39 and 40 are l located on opposite sides of the axial line, as

shown in plan, and on opposite sides of the middle of the cylinder, as indicated most clearly in Figs. 3 and 4:, and it will be observed that the upper portions of the sections 39 and 40 of these ports are offset inwardly, so that they pass near the central portion of the main valve 21. As these ports are not symmetrical with respect to the axial line of the main valve 21, it will be observed that the pockets ll and 42 are also unsymmetrically disposed, the said pockets being respectively displaced somewhat toward opposite extremities of the valve, as indicated most clearly in Fig. 6. In operation, supposing the piston 5 to be moving in the direction of the arrow adjacent thereto, which would be the case supposing the valve 21 to occupy the extreme position shown, it would follow that when the piston 5 had advanced sufiiciently to pass the pilot-port 39 live steam would then pass up this port through the pocket ail and be admitted in the end 12 of the pilot-valve chest. Evidently the position shown in Figs. 1 and 3 for the main valve corresponds to such a direction of movement of the piston 5, it appearing that the live-steam port 6 at the right would be open while the exhaust-port 7" at the left would be open. Now when the steam is admitted at the point indicated in the pilot-chest 12 it will operate to throw the valve 19 to its opposite extreme positionthat is, toward the end 12 of the chest. lVhen this movement of the valve occurs, the pocket 37 would be advanced, so as to open communication between the exhaust-ports 30 and 33 of the main-valve chest. At the same time the opening 29 would move over the admission-port 27, so that steam would then be admitted to the end 9 of the valve-chest 9. This would operate to throw the main valve 21 toward the end 9 of its chest, in this manner admitting steam to the opposite extremity of the steam-cylinder 1 and opening the other extremity to exhaust.

It will be observed that although the advance movement of the piston 5 just described will operate to uncover the pilot-port 4O first uncovering this port will not affect the pilotvalve, for the reason that this port is then closed by the displacement of the pocket 4L2.

, The pilot chest or cylinder exhausts through the same ports which admit steam thereto. In this connection it should -be understood that the exhaust from the pilot-cylinder does not take place until after the pilot-valve has begun each reverse movement. Just as this reverse movement begins the exhaust from the pilot-cylinder is not open, by reason of the fact that the main valve would bein the wrong position for this purpose; but as soon as a slight movement of the pilot-valve had taken place the actuating-ports for the main valve would become open, so that the position of the main valve would become reversed before the pilot-valve had completed its movement,

in this manner opening the exhaust of the pilot-valve before it could come to rest. This mode of operation for the pilot-valve operates advantageously to produce desirable cushioning effects at the heads of the chest.

Threaded openings 43 are provided on the under side of the main cylinder-body 1, the

same being intended to receive drip-cocks or drip-pipes.

hile we have shown in the accompanying drawings the preferred form of our invention, it will be understood that we do not limit ourselves to the precise form shown, for many of the details may be changed in form or position without affecting the operativeness or utility of our invention, and we therefore reserve the right to make all such modifications as are included within the scope of the following claims or of mechanical equivalents to the structures set forth.

Having described our invention, what we claim as new, and desire to secure by Letters Patent, is 1 1. In a steam-actuated valve, in combination, a steam-cylinder, a piston adapted to reciprocate therein, a main-valve chest the axis whereof is substantially parallel with the axis of said cylinder, a main valve adapted to reciprocate in said main-valve chest, a pilotvalve chest the axis whereof is disposed substantially at right angles to the axis of said main-valve chest, a pilot-valve adapted to re ciprocate in said pilot-valve chest, ports connecting said pilot-valve chest with said mainvalve chest whereby said pilot-valve may control the movement of said main valve, ports leading from said main-valve chest to the interior of said cylinder whereby said main valve may control the actuation of said piston, and ports leading from the interior of said cylinder to said pilot-valve chest, whereby the steam driving said piston may actuate said pilot-valve.

2. In a steam-actuated valve, in combination, a steam-cylinder, a piston adapted to reciprocate therein, a main valve adapted to control the admission to said cylinder, a pilotvalve adapted to control the movement of said main valve, a pilot-valve chest in which said pilot-valve moves, ports leading from said cylinder on opposite sides of the central line thereof and connecting with said pilot-valve chest. said main valve affording means for opening or closingsaid last ports.

3. In a steam-actuated valve. in combination, asteam-cylinder, a piston adapted to reciprocate therein, a main-valve chest, a main valve adapted to reciprocate therein and controlling the steam admission to said cylinder,

said main-valve chest, said main valve having pockets which may open comn'iunication through said other ports.

4C. In a steam-actuated valve, in combination, a steam-cylinder, a main-val ve chest,ports leading from said main-valve chest to the interior of said cylinder, a piston adapted to reciprocate in said cylinder, a hollow main valve adapted to reciprocate in said main-valve chest and having openings in the wall thereof coop erating with said ports, a pilot-valve chest, ports leading therefrom and communicating with the interior of said main-valve chest, a hollow pilot-valve adapted to reciprocate in said pilot-valve chest and having openings cooperating with said last ports, means for admitting steam to the interior of said pilotvalve and said main valve, and automatic means for actuating said pilot-valve.

5. In a steam-actuated valve, in combina-.

tion, a steam-cylinder, a main-valve chest,ports leading from said mainvalve chest to the in teriorof said steam-cylinder, a piston adapted to reciprocate in said cylinder, a hollow main valve adapted to reciprocate in said main-valve chest and having openings through the wall thereof cooperating with said ports, a pilotvalve chest, ports leading therefrom and communicating with the interior of said mainvalve chest, a hollow pilot-valve adapted to reciprocate in said pilot-valve chest and having openin s therein cooperating with said last ports, means for admitting steam to the interiors of said valves, and ports leading from the interior of said cylinder to said pilot-valve chest and adapted to admit steam from said cylinder to actuate said pilot-valve.

6. In a steam-actuated valve, in combination, a steam-cylinder, a main-valve chest,ports between said main-valve chest and the interior of said cylinder, a main valve controlling said ports, a pilot-valve chest, ports leading from said pilot-valve chest to said mainvalve chest, a pilot-valve adapted to reciprocate in said pilot-valve chest and controlling said last ports, said last ports comprising independent admission and exhaust ports, said pilot-valve being hollow and having openings in the wall thereof cooperating with said admission-ports, said pilot-valve having pockets in the outer face thereof cooperating with said exhaust-ports, and automatic means for actuating said pilot-valve.

7. In a steam-actuated valve, in combination, a steam-cylinder, a main-valve chest, ports between said main-valve chest and the interior of said cylinder, a main valve controlling said ports, a pilot-valve chest, ports leading from said. pilot-valve chest to said mainvalve chest, a pilot-valve adapted to reciprocate in said pilot-valve chest and controlling said last ports, said last ports comprising independent admission and exhaust ports, said pilot-valve being hollow and having openings in the wall thereof cooperating with said admission-ports, said pilot-valve having pockets in the outer face thereofcooperating with said exhaust-ports, and ports leading from the interior of said cylinder on opposite sides of the middle line thereof and communicating with the opposite extremities of said pilot-valve chest.

8. In a steam-actuated valve, in combination, a main-valve chest, a steam-actuated main valve mounted in said chest, a pilot-valve chest, admission-ports leading from said pilotvalve chest to the extremities of said mainvalve chest, exhaust-ports leading from the extremities of said main-valve chest and opening out upon the face of said pilot-valve chest, other exhaust-ports opening out upon the surface of said. pilot-valve chest adjacent to said first exhaust-ports, said last exhaust-ports be: ing adapted to lead the steam to an outlet, said pilot-valve being hollow and adapted to receive live steam within the interior thereof, said pilot-valve having openings through the wall thereof which may communicate respectively with said admission-ports and having pockets in the outer face thereof adapted to open communication between the adjacent exhaust-ports.

In testimony whereof We have hereunto set our hands in the presence of two witnesses.

LEGER PIGARD. eAUDIAs BUREAU.

\Vitncsses:

J. B. FoReUEs, J. BRONIN.

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