US1677499A - Rotary valve - Google Patents

Description

Jul 17, 1928. 1,677,499

7 w. J. SMITH ROTARY VALVE Filed Nov. 19, 1927 2 Sheets-Sheet l July 17, 1928. I v 1,677,499

W. J. SMITH ROTARY VALVE Filed Nov. 19, 1927 2 Sheets Sheet 2 .5 16 X l |||l l 4 v Jnz'eniar:

W 5 I 4 W Patented July 17, 1928.

UNITED STATES WILLIAM J. SMITH, OF PHILADELPHIA, PENNSYLVANIA.

ROTARY VALVE;

Application filed November 19,1927. Serial No. 234,839.

This invention relates to rotary valves, and it relates particularly to that class of these valves which are adapted for use in controlling and governing a fluid, constantly supplied under a uniform pressure, in actuating, for instance, the reciprocatory movement of the piston of a cylinder.

The object of the invention is to provide a valve of the kind described which shall be simple and cheap in construction, capable of easy and rapid operation, and by which the quantity of fluid allowed to pass through it may be varied from the full capacity of the valve to the smallest portion thereof. A further object of the invention is to provide a valve of the kind described which shall be so constructed as to be capable of receiving the fluid after being-utilized anddischarge it from the valve from which it may be conveyed, if desired, to a place of storage for future use.

Having the above mentioned objects in view, the invention consists of a valvehaving the novel features of construction and arrangement of parts substantially as hereinafter. described and claimed.

The invention is illustrated in the accompanying drawings, in which:

Figure 1 is a, front view of a valve, showing a handle for operating it, a pointer extending from the handle, and a scale indicating the position of the valve when the pointer is in line with the markings of the scale. Figure 2 is a central longitudinal vertical sectional view of the valve and its, operating handle.

Figure 3 is a transverse central vertical sectional view of the valve, the parts being in position to allow the entire amount of fluid admitted to the valve to pass out through one of the discharge ports thereof,

and to receive a corresponding amount of fluid through the other discharge port.

Figure 4 is a view similar to Figure 3, the parts of the valve being in position entirely to shut off connection between the inlet port of the valve and the outlet ports thereof, and

Figure 5 is a view similar to Figure 3, the parts of the valve being shown in positions to allow discharge of the fluid from the port which is shown in Figure 3 in positionto receive the used fluid, and to allow entrance through the port shown in discharging position in Figure 3 of the used fluid.

The valve consists of a casing 1 having a cylindrical chamber 2 therein, and the valve proper located in the casing. The casing has extending through its walls and communicating wit-l1 the chamber, the inlet port 3, the ports 4 and 5, which in the operation of the valve serve both as discharge and inlet ports, and the return port 6.

The valve proper 7 consists of a cylindrical body closely fitting and rotatable in the chamber 2, and having a stem 8 to which is pinned a handle 9 formed with a pointer or finger 10. The valve has in one side thereof an elongated channel 11 which, when the parts are assembled, is in position to be caused to register with the inlet port 3 and the ports 4 and 5. The length of the chamber is such that when the valve is properly positioned it may form a passage for conducting all the fluid received through the inlet port 3 to either the port 4 or the port 5 through which it is discharged.

Centrally located and extending longitudinally partly through the valve 7 is a passage 12, the outer end of which extends to the rear face of the valve andis in communication with the return port 6. A conduit 13 extends from the periphery of the valve and at its inner end communicates with the passage 12. The conduit 13 is so located with respect to the channel 11 of the valve that when the chamber is in position to conduct fluid from the inlet port 3 to the port 4 the conduit will register with the port 5, and that when the inlet port is in communication with the port 5 the conduit will register with the port 4. v

The valve is intended particularly for use in governing the flow of a liquid, for instance, oil, which is received at the inlet port under pressurefrom a pump or the like, and

alternately introduced into and discharged from the ends of a cylinder for reciprocating the piston of the latter, the oil, after being discharged from the cylinder, being returned to a tank from which the pump is supplied. To this end, when in the use of the valve the parts of thevalve are in the positions shown in Figure 3, oil received through the inlet port 3 will be conducted to and discharged from the port 4 from which it may pass to one end of a cylinder for actuating its piston. When the parts are positioned as described the port 5, which may 1 be connected to the end of a cylinder opposite to that to which the port 5 is connected,

is through the conduit 13 and the passage 12 connected with the return port 6 whichvmay be connected with a tank for receiving oil. When the valve is in the position shown in Figure 6 the oil will pass fromthe inlet port 3 to and through the port 5 and, for instance, to the end of a cylinder opposite to that to which the port 4 is connected, and the port 4 will be in communication with the return port 6. Thus the valve may be 01perated to direct oil under pressure to t e ends of a cylinder and to receive it from such ends alternately through ports 4 and 5, and the oil alternately forced from the cylinder inlay be directed by the valve to a tank or the In order that the quantity of a fluid received through the inlet port 3 and directed to one or the other of the discharge ports 4 and 5 may be governed, and also the quantity of fluid permitted to pass through the ports 4 and 5 to the return port correspondingly determined, the periphery of the valve is provided with two tapering grooves 14 and 15 communicating respectively with the channel 11 and with the conduit 13. The larger end of the groove 14 communicates with one end of the chamber 11 and terminates a short distance from the conduit 13 and the larger end of the groove 15 communicates with the conduit 13 and terminates a short distance from the end of the channel 11, opposite to that with which the groove 14 is connected. By the positioningof the valve formed as described fluid received at the inlet port 3 of the valve may be caused to flow to either of the discharge ports 4 or 5 in quantities corresponding to the full capacity of the channel 11, or by bringing any selected portion of the groove 14 into communication with the inlet port 3 and with one of the other of the ports 4 or 5 the quantity of fluid may be reduced to any desired extent, and finally the flow from the inlet port 3 to either the port 4 or 5 may entirely be cut off by bringing the valve to the position shown in Figure 4 of the drawing.

The grooves 14 and 15 are so disposed in relation to each other that the quantity of fluid returned after use which is permltted to enter either the port 4 or the port 5 corresponds to that which is being discharged for use through the other of these ports. Therefore, should the valve be used, for instance, in actuating the piston of a cylinder, by alternately introducing and discharging a fluid into and from the respective ends of the cylinder, themovement of the piston is rendered smooth and uniform throughout, because of the facts that the .fluid previously introduced into one end of the cylinder acts as a cushion for the piston when the impelling fluid is lntroduced into the other end, and that such previously introduced fluid is allowed by the valve to be displaced only in a quantity corresponding to that being introduced to actuate the piston.

The Valve is intended for use in governing a fluid introduced into it under high pressure. As the fluid enters the inlet port of the valve it, impinges against the valve proper 7, generally upon the whole or a part of the surface of the channel 11. To prevent binding of the valve by the pressure of the fluid to an extent to prevent its free rotation a chamber 16, shown by dotted lines in Figures 3, 4 and 5 of the drawings, is formed in the periphery of the valve opposite the channel 11. The chamber 16 is in communication with the conduit 13, and, therefore, the fluid, after being used and forced through one of the ports 4 or 5, is

distributed in the chamber 16 and forms a cushion of fluid under pressure to balance the initial pressure of the fluid imposed upon the valve.

. I claim:

1. A valve comprising a casing providedwith an inlet port and with discharge ports, and a rotary valve provided with an inlet passage and with a return conduit, and with tapering grooves communicating respectively with the inlet passage and with the return conduit.

2. A valve comprising a casing provided with an inlet port and with discharge ports, and a rotary Valve provided with an inlet passage and with a return conduit arranged opposite the inlet passage, and with tapering groove-s communicating respectively with the inlet passage and with the return con- 7 duit.

3. A valve comprising a casing provided with an inlet port and with discharge ports, and a rotary valve provided with an inlet passage and with a return conduit, and with two tapering grooves, the larger end of one groove communicating with the inlet passage, and the larger end of the other groove communicating with the return conduit.

4. A valve comprising a casing provided with an inlet port, with discharge ports, and

with a return port, and a rotary valve pro-

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