GB2168127A - Valve - Google Patents

Abstract

In a rotary plug valve the closure member 20 is secured for rotation with a handle 40, preferably by splines 411, 242. The closure member 20 may include a rubber sleeve seal 30 which fits over a portion 21, creep being prevented by protrusions 212, 213. The valve body 10 may have a projection 152 to cooperate with a recess 412 in the handle to define the limits of valve movement. Various embodiments relate to straight- through flow (Figs. 5A, B); diversion through 90 DEG (Figs. 3, 4); and multiway flow (Figs. 6A, B, C). <IMAGE>

Description

SPECIFICATION Valve This invention is related to a valve and particularly concerns a valve suitable for controlling fluid flowing through a pipeline.

Conventionally, a rising stem globe valve as shown in Fig. 1 is usually employed in a pipeline for controlling the flow, in which the fluid flows through an opening whose edge forms the valve seat 6, the stem 2 is provided with a disc 3 which is usually provided with a sealing washer 4 to make the actual physical contact with the seat 6 and thus stop the flow.

To open the valve, the disc 3 is raised by rotating the handwheel 1 in the counterclockwise direction, so that the stem 2 is screwed out of the valve seat 6. Clockwise rotation brings the valve disc 3 into contact with the seat 6 and thus closes the valve.

This type of valve has a complex construction which accounts for its high cost of manufacture. Besides, in each cycle of rotation, -the disc 3 rises or lowers only with the pitch of the threads, therefore, the operation of the disc 3 from the closed position to the open position is rather inconvenient and time-consuming.

A primary object of the invention is to provide an improved rising stem valve suitable for use with a pipeline and thus eliminating the aforementioned drawbacks.

Another object of the invention is to provide an improved rising stem valve capable of controlling the flow in both straight pipe and angle pipe.

According to the present invention, there is provided a valve for regulating straightway flow or angle way flow in pipelines, comprising: a hollow valve body having an intake port and at least one exit port; a valve stem having a wiping portion rotatable therewith within the hollow valve body and capable of opening, partially shutting or shutting with at least one exit port when being turned into alignment or out off alignment with respect to least one exit port; and a handwheel member secured with the valve stem and capable of being turned to ajdust the relative position of the wiping portion and the at least one exit port.

According to another aspect of this invention, the valve stem includes an upper section provided with external teeth, and the handwheel member which includes a downwardly extending cylindrical portion provided with internal teeth for engaging with the external teeth of the upper section of the valve stem so as to lock the two members to rotate together.

According to a further aspect of this invention, there is provided a means for defining the angular displacement of the handle member with respect to the hollow valve body when being turned from an open positon to a closed position, or vice versa, with respect to the at least one exit port, which comprises a recess formed on the lower circumferential surface of the downwardly extending portion of the handwheel member and extended for a certain length defined by two end surfaces; a rim portion having a thickened portion formed on the hollow valve body and capable of smoothly moving within the recess between the two end surfaces thereof.

Further characteristices and advantages of the present invention will become apparent from the following description made with reference to the attached drawings, wherein: Figure 1 is a longitudinal section view of a conventional globe valve; Figure 2 is an exploded broken away view illustrating a preferred embodiment of the valve according to this invention; Figure 3 is a longitudinal section view of the same embodiment in a closed position thereof; Figure 4 is a similar view as Fig. 3 except the valve is shown in on open position; Figure 5A shows a second embodiment of the valve which is mounted within a straight pipe and operated to a position blocking the passages of fluid in two directions; Figure 5B shows the same embodiment as shown in Fig. 5A in a position allowing the fluid to flow to the pipelines in opposite directions;; Figure 6A shows a third embodiment of this invention in a straight pipe for directing the fluid into the right side pipe; Figure 6B shows the same embodiment in a position for directing the fluid to flow into the left side pipe; Figure 6C shows the same embodiment in an open position for permitting the fluid to flow in two directions.

Referring now to the drawings, in Fig. 2, reference numeral 40 denotes a handwheel which is associated with a valve stem 20, a downwardly extending portion 41 is formed at the center thereof and provided with internal teeth 411, on the perimetric surface of the extending portion 41 there is a recess 412 formed and extending about 270 degrees.

This embodiment is also designed to be mounted in a angle pipe. Therefore, the valve body generally designated by the numeral 10 is formed with a construction including a larger diameter cylindrical portion 11 for connecting with a vertical pipe and a smaller diameter cylindrical portion 12 for connecting with a longitudinal pipe extended laterally with the larger cylindrical portion 11 and communicated therewith through the opening or exit port 14, the valve controls the fluid in the vertical pipe which either flows or does not flow into the longitudinal pipe.

As can be seen in Fig. 3 and Fig. 4, a shoulder portion 153 is formed on the inner wall of the valve body 10. And, the threads 106 are provided on the outer surface of the valve body 10 for connecting with a pipe coupling 100.

The upper end of the larger diameter cylindrical portion 11 has an opening 15 surrounded by a rim portion 151, the rim portion 151 has a thickened portion 152 extended for an angle of 90 degrees and accompdated within the recess 412, the thickened portion 152 constitutes a barrier of free rotation of the handwheel 40 with respect to the valve body 10 and limits the relative rotation of the handwheel 40 and the valve body 10 within a range of 180 degrees.

The valve stem 20 has a toothed portion 242 which engages with the teeth 411 of the handwheel 40 to hold these two members against relative rotation and rotatable as a whole. Further securing of the valve stem 20 and the handwheel 40 is effected by means of a screw 422 which passes through a hole 421 of the latter and screws into a threaded bore 243 of the former.

Under the toothed portion 242 a cylindrical portion 24 is provided for abutting with the lower edge of the downwardly extending portion 41 of the handwheel 40, a groove 245 is formed on the circumferential surface thereof for holding a gasket 241.

A disc portion 23 is formed in an intermediate position of the valve stem 20 and to be retained under the shoulder portion 153 as can be seen in Figs. 3, 4.

Extending downwardly from the disc portion 23 is a wiping portion 21 and a rod 22 behind the wiping portion 21, there are protrusions 212, 213 formed on the wiping portion 21 for providing resistance. A flexible plug member 30 preferably formed of rubber or other waterproof material and formed in a tubular shape is fitted over the wiping portion 21, with a portion thereof located between the wiping portion 21 and the rod 22, the protrusions 212, 213 function to keep it from moving relative to the wiping portion 21.

Since the plug 30 is made of flexible material, when it is fitted over the wiping portion 21, the portion thereof adhered onto the wiping portion 21 provides a wiping surface 31 which can seal off the exit port 14 when the wiping portion 21 is turned into alignment with the exit port 14, as shown in Fig. 3. In accordance with the arrangement of the recess 412 and the thickened portion 152, the angular displacement from the closed position to the open position is 180 degrees.

In order to obtain a good sealing effect, the wiping portion 21 is fitted with plug member 30 which must be larger than the dimension of the opening 14 by some extent. The crosssection of the wiping portion 21 is fitted with the plug member 30 which must be slightly smaller than that of the valve body 10 to prevent the valve from sticking.

In Fig. 4 the valve plug 30 is turned to the opposite direction of the exit port 14 and thus opens the exit port 14 to direct the fluid into the smaller diameter cylindrical portion 12.

It is obvious that by turning the wiping surface 31 to a position where it does not fully obstruct the flow of fluid, the flow can be controlled at the desired flow rate depending on the opening of the exit port 14.

The valve according to this invention can be employed in a straight pipe as shown in Figs.

5A and 5B, the embodiment designed for this purpose includes a valve body 10 having two exit ports 14, 14 located in opposite directions, and the thickened portion 152 is extended through one half the circumference of the rim 151, and the wiping portion 21 extends for substantially the same length. Therefore, an angular displacement of 90 degrees changes the valve plug 30 from the two-way closed position to the two-way open position, a illustrated by Fig. 5A and Fig. 5B.

A further embodiment is shown in Figs. 6A, 6B and 6C, this embodiment is also designed for use with a straight pipe, it can be noted that both of the recess 412 and thickened portion 152 are not provided so that the handwheel 40 may be rotated about 360 degrees with respect to the valve body 10.

Claims (9)

1. A valve for regulating straightway flow or angle way flow in a pipeline, comprising: a hollow valve body including an intake port and at least one exit port; a valve stem having a wiping portion rotatable therewith within said hollow valve body, said wiping portion capable of opening, partially shutting or shutting said at least one exit port when being turned into alignment or out of alignment with respect to said at least one exit port; and a handle member secured with said valve stem and capable of being turned to adjust the relative position of said wiping portion and said at least one exit port.

2. A valve for regulating the straightway flow or angle way flow in a pipeline as claimed in claim 1, wherein said valve stem includes an upper section provided with external teeth, and said handle member which includes a downwardly extending cylindrical portion provided with internal teeth for engaging with said external teeth of said upper section of said valve stem so as to lock the two members causing them to rotate together.

3. A valve for regulating straightway flow or angle way flow in a pipeline as claimed in claim 1, further comprising means for defining the angular displacement of said handle member with respect to said hollow valve body when being turned from an open position to a closed position, or vice versa, with respect to said at least one exit port.

4. A valve for regulating straightway flow or angle way flow in a pipeline as claimed in claim 3, wherein said means for defining the angular displcement of said handle member with respect to said valve body comprises: a recess formed on a lower circumferential surface of said downwardly extending portion of said handle member and extending for a length defined by two end surfaces; a rim portion having a thickened portion formed on said hollow valve body, when turning said handle member, said thickened portion capable of being moved within said recess with the limit of said two end surfaces.

5. A valve for regulating straightway flow or angle way flow in a pipeline, comprising: a hollow valve body having an intake port and at least one exit port; a valve stem having a wiping portion rotatable therewith within said hollow valve body; a plug member suitable for encasing said wiping portion and sealing off said at least one exit port: and a handle member secured with said valve stem and capable of being turned through certain angular displacements to bring said wiping portion encased by said plug member into alignment or out off alignment with respect to said at least one exit port thereby sealing off, partially shutting or opening said at least one exit.

6. A valve for regulating straightway flow or angle way flow in a pipeline as claimed in claim 5, wherein said valve stem includes an upper section provided with external teeth, and said handle member which includes a downwardly extending cylindrical portion provided with internal teeth for engaging with said external teeth of said upper section of said valve stem so as to lock the two members to causing them rotate together.

7. A valve for regulating straightway flow or angle way flow in pipelines as claimed in claim 5, further comprising means for defining the angular displacement of said handle member with respect to said hollow valve body when being turned from an open position to a closed position, or vice versa, with respect to said at least one exit port.

8. A valve for regulating straightway flow or angle way flow in a pipeline as claimed in claim 7, wherein said means for defining the angular displacement of said handle member with respect to said valve body comprises: a recess formed on a lower circumferential surface of said downwardly extending portion of said handle member and extending for a length defined by two end surfaces; a rim portion having a thickened portion formed on said hollow valve body, when turning said handle member, said thickened portion capable of being moved within said recess with the limit of sid two end surfaces.

9. A valve for regulating straightway flow or angle way flow in a pipeline substantially hereinbefore described with reference to the accompanying drawings.