JPH09210226A - Opening/closing valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an opening/closing valve simplifying a structure, improving air-tightness and with inexpensiveness excellent in economical efficiency. SOLUTION: In this opening/closing valve, a valve unit 10 having a through hole 11 in a valve chamber 2 of a main unit 1 is rotated, flow paths 3, 3 provided in the main unit 1 are opened/closed, an external surface of the valve unit 10 and an internal surface of the valve chamber 2 are formed in almost the same shape, at least a surface of the valve unit 10 or either one or both of a surface of the valve chamber 2 of the main unit 1 is coated with a non- metal material, this valve unit 10 is turnably brought into close contact with inside the valve chamber. Here, a contact surface between a surface of the valve unit 10 and a surface of the valve chamber 2 of the main unit is made to serve as a seal surface and sliding surface, and a surface of the valve unit 10 or a surface of the valve chamber 2 or both the surfaces are coated with a non-metal material, so as to reduce frictional resistance, the valve unit 10 can be smoothly turned, and the valve unit 10 can be internally fitted turnably in the main unit valve chamber 2.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an on-off valve used for opening and closing a pipeline.

[0002]

2. Description of the Related Art In general, a ball valve opens and closes a pipe by rotating a ball provided in a main body by rotating a handle by about 90 degrees. Further, as a simple on-off valve, there is a cock that uses the same mechanism as a ball valve.

[0003]

The ball valve is advantageous in that it is easy to operate and has little fluid resistance in the piping. However, there is a problem such as an increase in cost due to the number of parts and processing cost. Also, the cock has a smaller number of parts than the ball valve and can be processed easily, so the cost can be kept low, but the rotation torque during operation is large, the opening and closing of the pipeline is troublesome, and the airtightness is low, so low pressure is required. When used for other than fluids, there was a problem that the main body had to be made larger.

Therefore, the present invention has been developed in view of the above circumstances, and provides an opening / closing valve having a simple structure, good airtightness, low cost and excellent economical efficiency. With the goal.

[0005]

To achieve the above object, the present invention relates to an on-off valve for rotating a valve body having a through hole in a valve chamber of a main body to open and close a flow passage provided in the main body,
The outer surface of the valve body and the inner surface of the valve chamber are formed to have substantially the same shape, and at least one or both of the surface of the valve body and the surface of the valve chamber of the main body is coated with a non-metallic material. The body is rotatably and closely sealed in the valve chamber, and the contact surface between the valve body surface and the valve body surface of the main body becomes the sealing surface and the sliding surface. Since the non-metallic material is coated, the frictional resistance is reduced, the valve body can be smoothly rotated, and the valve body can be rotatably fitted in the main body valve chamber.

When the valve body is formed in a cylindrical shape and the lower end is formed in a substantially hemispherical shape, the load applied to the lower end of the valve body is evenly distributed on the peripheral surface of the lower part of the valve chamber, There is no axial displacement of the body and good sealing performance.

Further, when the valve body is formed in a conical shape inclined toward the center side and the lower end is formed in a substantially hemispherical shape, the load applied to the lower end of the valve body is evenly distributed on the lower peripheral surface of the valve chamber. Since the valve body is formed into a tapered cross-section, it is possible to receive a downward load on the entire valve body, and the fluid resistance causes It is possible to surely prevent the displacement of the valve body.

An annular groove is formed in the upper part of the valve chamber,
Since the locking ring for restricting the vertical movement of the valve body is attached to the annular groove, the valve body can be brought into close contact with the valve chamber, the sealing property is good, and the displacement of the valve body due to fluid resistance can be suppressed.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. As shown in FIG. 1, a valve body 10 having a through hole 11 is rotatably fitted in a valve chamber 2 formed in a main body 1, and the valve body 10 is rotated to allow both sides of the valve chamber 2 to be rotated. The flow paths 3 and 3 provided in the above are blocked or communicated with each other to open and close the pipeline.

The valve body 10 has a columnar shape whose lower end is formed in a substantially hemispherical shape, and a stem 12 is provided on the upper surface so as to project. The through hole 11 communicating with the flow paths 3 and 3 provided in the main body 1
Are perforated so as to be orthogonal to the axis of the valve body 10. The through hole 11 is formed to have the same diameter or a small diameter as the flow paths 3 and 3 (the same diameter in the figure). Furthermore, this valve body 10
The surface of the is coated with a non-metallic material 20 having a small frictional resistance, such as resin, rubber, and PTFE, by an injection molding method. The non-metallic material 20 may be coated on the surface of the valve chamber 2 instead of on the surface of the valve body 10, or on both surfaces.

The inner surface of the valve chamber 2 provided in the center of the main body 1 is
The valve body 10 is formed in the same shape as the outer surface of the valve body 10 (cylindrical shape with a spherical bottom surface), and further, on the upper part of the valve chamber 2,
An annular groove 5 into which a locking ring 4 for restricting the vertical movement of the is inserted is provided. Then, the lower surface of the inner peripheral edge portion of the locking ring 4 is brought into contact with the upper surface of the valve body 10 fitted into the valve chamber 2, and the outer peripheral edge portion of the locking ring 4 is fitted into the annular groove 5 to form a valve. The body 10 is pressed downward and is rotatably fitted into the valve chamber 2. The upper surface of the valve body 10 and the lower surface of the locking ring 4 may be coated with a non-metallic material (not shown) having a small frictional resistance. Further, an elastic member (not shown) such as a coil spring may be interposed between the locking ring and the upper surface of the valve body to press the valve body downward (see FIG. 2).

Further, on the inner peripheral surfaces of both ends 6 and 6 of the short tubular main body, threads for screwing the pipe to be connected are formed. Further, an operation mechanism (not shown) for rotating the valve body 10, such as a handle or an actuator, is detachably connected to the upper end of the stem 12 provided on the upper surface of the valve body 10.

Even if an annular groove for sealing is provided in the upper portion of the valve body (see FIG. 2) or in the upper portion of the valve chamber, and a seal ring (see FIG. 2) is attached to the annular groove for sealing. good. Further, a screw thread may be formed on the inner peripheral surface or the outer peripheral surface of the short tubular protrusion on the upper portion of the valve chamber, and a cap (not shown) having a stem insertion hole may be screwed.

Next, another embodiment of the present invention will be described in detail with reference to FIG. The same reference numerals are used for members that are common to the above-described embodiments. In the on-off valve shown in FIG. 2, the valve body 10 is formed in a conical shape with an inverted C-shaped cross section having a lower end formed in a substantially hemispherical shape, and the valve chamber 2 provided in the center of the main body 1 is valved like the above-described on-off valve. The valve body 10 is formed in the same shape as the body 10 (the inverted bottom surface having a spherical bottom surface), and the valve body 10 is rotatably and closely attached to the valve chamber 2 to be fitted therein.

A stem 12 is provided on the upper surface of the valve body 10, and a through hole 11 communicating with the flow paths 3 and 3 provided in the main body 1 is bored so as to be orthogonal to the axis of the valve body 10. doing. The through hole 11 is formed to have the same diameter or a small diameter as the flow paths 3 and 3 (the same diameter in the figure). In addition, valve element 1
An annular groove 13 for sealing is formed in the upper part of 0, and a seal ring 14, for example, a PTFE ring or an O ring is attached to the annular groove 13 for sealing to seal between the valve body 10 and the body 1, Prevent leaks.

Further, an annular groove 5 for pressing is formed in the upper portion of the valve chamber 2, and a locking ring 4 for restricting the vertical movement of the valve body 10 is mounted in the annular groove 5, and the locking ring 4 is attached. And valve body 1
The elastic member 15, for example, a coil spring is interposed between the valve body 10 and the upper surface of 0, and the valve body 10 is constantly pressed downward to be fitted into the valve chamber 2. As another example, although not shown, the locking ring 4
It is also possible to form a retightening structure by tightening bolts by screwing bolts to the left and right sides of the valve body and pressing the valve body 10 downward. Similar to the on-off valve described above, the surface of the valve body 10 is coated with a non-metallic material 20 having a small frictional resistance, such as resin, rubber or PTFE, by an injection molding method.

The non-metallic material 20 may be coated on the surface of the valve chamber 2 instead of the surface of the valve body 10. Further, the sealing annular groove 13 for mounting the seal ring 14 may not be provided in the valve body 10 and may be provided at a position lower than the pressing annular groove 5 in the upper portion of the valve chamber 2. Furthermore, without using the elastic member 15,
The locking ring 4 is brought into direct contact with the upper surface of the valve body 10 so that the valve body 1
You may press 0 downwards.

In the two embodiments described above, the lower end of the valve body 10 is formed in a substantially hemispherical shape, and the bottom surface of the valve chamber 2 is formed into the valve body 1.
Since it is formed in a spherical shape having the same radius of curvature as the 0 lower end, the load applied to the lower end of the valve body 10 is evenly distributed to the bottom surface of the valve chamber 2, there is no axial runout of the valve body 10, and the sealing performance is good. Also,
Since the surface of the valve body 10 (or the surface of the valve chamber 2) is coated with the non-metallic material 20 having a small sliding resistance, the valve body 1 can be smoothly moved.
It is possible to rotate 0 and open and close quickly. When the surface of the valve body 10 is coated with the non-metal material 20 by the injection molding method, the error of the outer diameter is small, the compatibility of the valve body 10 is improved, and the valve body 10 can be replaced when it is consumed. Further, since the number of parts is small and the processing is easy, the cost can be reduced.

Further, when the valve body 10 is formed in a conical shape having an inverted inverted V-shaped cross section, the load is dispersed over the entire valve chamber 2 and further, the valve body 10 is always elastically urged downward. The vertical movement of 10 is suppressed, and the displacement of the valve element due to the fluid resistance is reliably prevented.

Next, the opening / closing operation of the above-mentioned on-off valve will be described. From the fully closed state shown in FIG. 1 and FIG. 2, the stem 12 is rotated 90 degrees by using an operating mechanism (not shown) to move the valve body 10 to 90 degrees.
In order to fully open the pipe line by making the flow passages 3 and 3 on both sides of the valve chamber 2 communicate with the through hole 11 of the valve body 10 and to fully close the pipe from the fully opened state, an operating mechanism is used. Contrary to the case of fully opening, the stem 12 is rotated 90 degrees to rotate the valve body 10 by 90 degrees, and the open ends of the flow paths 3 and 3 on both sides of the valve chamber 2 are sealed with the surface of the valve body 10 to open the pipe path. Fully close.

[0021]

According to the present invention described in detail above, the inner surface of the valve chamber of the main body and the outer surface of the valve body are formed in the same shape, and
Since one or both surfaces are coated with the non-metallic material, the frictional resistance on the sliding surface is reduced and the sealing property is improved. Further, since the valve body is closely fitted into the valve chamber, axial deviation of the valve body is prevented, and the valve body can be used even when the fluid resistance of the conduit is large.

Further, since the bottom surface of the valve chamber is formed in a spherical shape so as to be in close contact with the lower part of the hemispherical valve body, the load of the valve body is dispersed and the sliding resistance when the valve body rotates is small. In addition, since the vertical movement of the valve body can be restricted by the locking ring, the structure can be simplified. Therefore, the number of parts can be reduced, the assembling can be extremely simple, the shapes of the respective parts can be simplified, and an extremely inexpensive on-off valve can be provided.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of the present invention.

FIG. 2 is a vertical sectional view showing another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 2 Valve chamber 3 Flow path 4 Locking ring 5 Annular groove (annular groove for pressing) 10 Valve body 20 Non-metallic material

Claims (4)

[Claims] 1. An on-off valve for opening and closing a flow path provided in a main body by rotating a valve body having a through hole in a valve chamber of the main body,
The outer surface of the valve body and the inner surface of the valve chamber are formed in substantially the same shape, and at least one or both of the surface of the valve body and the valve chamber surface of the main body is coated with a non-metallic material, and the valve body is An on-off valve characterized by being rotatably and closely attached to the valve chamber. 2. The on-off valve according to claim 1, wherein the valve body is formed in a cylindrical shape and the lower end is formed in a substantially hemispherical shape. 3. The on-off valve according to claim 1, wherein the valve body is formed in a conical shape that is inclined toward the center and the lower end is formed in a substantially hemispherical shape. 4. The on-off valve according to claim 1, wherein an annular groove is formed in an upper portion of the valve chamber, and a locking ring for restricting vertical movement of the valve body is attached to the annular groove.