TWI604148B - Ball valve - Google Patents

Description

Ball valve

The present invention relates to a ball valve excellent in durability, and it is possible to prevent contact between the ball and the holder without interposing the ball seat between the ball and the holder.

Conventionally, there has been known a ball valve having a structure in which a valve body for opening and closing a flow path, a ball seat arranged to surround the valve body, and a ball seat mounted on the ball seat are provided in an internal space of the valve body. The retaining member is configured to be used as a reinforcing material for suppressing deformation of the ball seat, and is disposed in such a manner as not to be in contact with the valve body.

A ball valve of this type is described in Patent Document 1, which is a ball valve having a configuration as shown in FIG. Specifically, a ball valve including a valve body (A) having an internal space, a spherical body (B) as a valve body that opens the flow path, and a space body disposed around the spherical body are disposed in the internal space. a ball seat (C), a holder (D) embedded in an opening portion of the ball seat (C), and a part of the ball side of the ball seat (C) protrudes from the flow path side so that the holder (D) and the ball body (B) is not in contact with each other, and the protruding portion (E) is disposed between the sphere (B) and the holder (D) (see (a) of Fig. 7).

Patent Document 2 discloses a ball valve in which a seat holder is provided at a front end of a flow path pipe connected to a valve body having left and right flow paths, and the seat holder is mounted with a ball seat via a ball seat The spring mechanism and the spherical surfaces of the ball valve body are pressed against each other.

<Previous Technical Literature> <Patent Literature>

<Patent Document 1> JP-A-2008-185113

<Patent Document 2> JP-A-2008-286228

As disclosed in FIG. 7(b), the technique disclosed in Patent Document 1 has a protruding portion (E) of a ball seat disposed between the holder (D) and the ball (B). Here, the ball seat (C) is often pressed from above due to the urging force of the spring (F), and is a resin material, so that the protruding portion (E) may be deformed. Therefore, as shown in Fig. 7(c), due to the deformation of the protruding portion (E) of the ball seat (C), the protruding portion (E) is caused to protrude toward the flow path, so that the flow path becomes narrow, and thus the flow rate is small. The problem with the amount expected. Further, since the protruding portion (E) of the ball seat (C) is deformed to protrude into the flow path, the fluid stays in the vicinity of the protruding portion, so that it is easy to accumulate dirt and it is difficult to clean the valve body. In addition, it is also possible that the ball is worn due to the contact between the ball and the retaining member, thereby causing the leakage and perforation of the seat.

The present invention has been made to solve such problems, and an object of the invention is to provide a ball valve which is capable of preventing a ball from coming into contact with a holder without having a ball seat disposed between the holder and the ball and having excellent durability.

The invention related to claim 1 relates to a ball valve including a valve body, a ball body, an operating mechanism, a connecting rod, a ball seat and a retaining member, wherein the valve body system has an inlet flow path, an outlet flow path, and An inner space between the flow passages may be coupled; the ball system is disposed in the inner space, and the flow passage is opened and closed by rotating around a reference shaft; the operating mechanism rotates the sphere around a reference axis; the connection a rod for connecting the operating mechanism and the spherical body; the ball seat is disposed in the internal space so as to surround the periphery of the spherical body, and has an opening portion having a substantially cylindrical shape on a side surface; the holder is embedded in the holder The aforementioned opening of the ball seat. The end portion on the valve body side, and the retaining member has a protruding portion that protrudes outward from the outer peripheral end portion; the ball seat has a side that is fitted to the protruding portion The notch portion is provided in the form of a shape in which the holder is fitted to the opening such that the end surface on the spherical body side of the protrusion portion abuts against the notch portion of the ball seat.

The invention of claim 1 relates to a ball valve according to claim 1, wherein the holder has the protrusions only on the upper portion with respect to the flow path.

The invention of claim 1 relates to a ball valve according to claim 1, wherein the projection is provided in an annular shape surrounding an outer peripheral end of the holder.

According to the invention of claim 1, since the holder is fitted to the opening so that the surface on the spherical side of the protrusion abuts against the notch of the ball seat, the holder does not come into contact with the ball seat. The position is pressed to the side of the ball, so that the contact of the ball with the holder can be prevented, and the situation in which the ball is worn does not occur. Further, compared with the ball seat provided with the protruding portion, the shape of the ball seat can be further simplified, and the work efficiency of the ball seat production can be improved. In addition, since the opening of the ball seat has a substantially cylindrical shape, it is not necessary to arrange the ball seat between the holder and the ball, and the flow path is not narrowed due to the deformation of the ball seat, so the flow path flowing through the ball valve The flow rate of the fluid can often be kept constant.

According to the invention related to claim 2, since the holder has the protrusion at the upper portion with respect to the flow path, it is possible to prevent an error in assembly of the holder from occurring when the ball valve is assembled.

According to the invention of claim 3, since the projection is provided in an annular shape surrounding the outer peripheral end portion of the holder, the shape of the holder can be simplified; in addition, the shape of the cutout portion of the ball seat is set to a ring shape. Therefore, the shape of the tee can be simplified, and the work efficiency of the tee production can be improved.

1‧‧‧Ball valve

2‧‧‧ flow path

3. A‧‧‧ valve body

4. B‧‧‧ sphere

5‧‧‧ Connecting rod

6, C‧‧‧ tee

7, D‧‧‧ holders

8‧‧‧Extrusion members

9, F‧‧ ‧ spring

10‧‧‧ Pressurized screw

11‧‧‧Operator

21‧‧‧Inlet runner

22‧‧‧Export flow channel

41‧‧‧through holes

61‧‧‧cutting section

71‧‧‧Protruding

711‧‧‧ face

72‧‧‧ recess

E‧‧‧Protruding

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a cross-sectional view showing a ball valve according to the present invention.

Fig. 2 is an enlarged cross-sectional view showing an important part of a ball valve according to the present invention.

3 is a view showing a screen selected from a ball, a connecting rod, a ball seat, and a holder constituting a ball valve according to the present invention; and FIG. 3(a) is a cross-sectional view of the flow path when the flow path is in an open state. 3(b) is a cross-sectional view perpendicular to the flow path, and FIG. 3(c) is a view seen from the flow path side.

Fig. 4 is a view showing a holder having a flow path. 4(a) is a front view, FIG. 4(b) is a cross-sectional view, and FIG. 4(c) is a plan view.

Fig. 5 is a view showing a holder having no flow path. Fig. 5(a) is a front view, Fig. 5(b) is a cross-sectional view, and Fig. 5(c) is a plan view.

Fig. 6 is a plan view showing a ball and a holder used in the ball valve of the present invention. Fig. 6(a) is a two-way valve, Fig. 6(b) is a three-way valve, and Fig. 6(c) is a four-way valve.

Fig. 7 is a view showing an important portion (lower portion) of a conventional ball valve. Fig. 7(a) is an enlarged cross-sectional view of an important portion, Fig. 7(b) is an enlarged view of the ball seat and the holder, and Fig. 7(c) is a view in which the ball seat protrudes toward the flow path.

An example of an embodiment of the ball valve according to the present invention will be described with reference to the drawings.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a cross-sectional view showing a ball valve according to the present invention. Fig. 2 is an enlarged cross-sectional view showing an important part of a ball valve according to the present invention.

A ball valve (1) according to the present invention includes: an inlet flow path (21), an outlet flow path (22), and a valve body (3) that can connect an internal space between the flow paths (2); a space, and a ball (4) for opening and closing a flow path by rotation around a reference axis (vertical axis); an operating mechanism (11) for rotating the ball about a reference axis; for connecting the operating mechanism (11) a connecting rod (5) to the sphere (4); having a slightly cylindrical shape and having an opening at the opposite position of the side surface, and surrounding the surrounding sphere (4) The ball seat (6) disposed in the inner space; and the retaining member (7) embedded in the opening of the ball seat (6).

As shown in Fig. 1, the valve body (3) is provided with an inlet flow path (21) and an outlet flow path (22), and has a substantially cylindrical inner space. As shown in Fig. 1, a spherical body (4), a ball seat (6), and a holder (7) are disposed in the internal space.

The sphere (4) has a substantially spherical shape and a through hole (41) in the horizontal direction of the flow passage between the inlet flow path (21) and the outlet flow path (22).

The ball (4) rotates around the vertical axis to permit or interrupt the flow between the inlet flow path (21) and the outlet flow path (22) by opening and closing the flow path (2). That is, when the through hole (41) formed in the sphere (4) overlaps the inlet flow path (21) and the outlet flow path (22), the flow path becomes an open state; when it is not overlapped, the flow path is Turns off.

An integrally formed rod-shaped connecting rod (5) is provided on the upper portion of the sphere (4).

The lower end portion of the connecting rod (5) is integrally formed with the upper surface of the ball (4), and the upper end portion thereof is coupled to an operating mechanism such as a handle.

Therefore, when the operating mechanism is rotated, the ball (4) and the connecting rod (5) rotate together around the vertical axis, so that the flow path can be switched.

Moreover, the connecting rod (5) and the ball (4) may be composed of one member, and the connecting rod (5) and the ball (4) may be composed of different members and combined with the two members. .

Fig. 3 is a view showing the selection of a sphere (4), a connecting rod (5), a ball seat (6), and a holder (7) constituting the ball valve of the present invention. Fig. 3 (a) is a cross-sectional view of the flow path when the flow path is in an open state, Fig. 3 (b) is a cross-sectional view perpendicular to the flow path, and Fig. 3 (c) is a view as seen from the flow path side.

The ball seat (6) is disposed in the internal space of the valve body (3) so as to surround the periphery of the ball (4). The ball seat (6) has an opening on a side surface of the valve body (3) on the side of the inlet flow path (21) and the outlet flow path (22). The opening of the ball seat (6) is formed into a slightly cylindrical inner portion that becomes a part of the flow path. space. The ball seat (6) has a notch portion (61) at an end portion on the valve body (3) side of the opening portion, and the notch portion (61) is fitted to a projection portion (71) of a holder (7) to be described later.

The ball seat (6) is formed of a synthetic resin material, and more specifically, is preferably a polytetrafluoroethylene (PTFE) or a tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA, Polytetrafluoroethylene-polyfluoroalkylvinylether copolymer), polyetheretherketone (PEEK, polyetheretherketone), ultrahigh molecular weight polyethylene (polyethylene) and the like.

As shown in Fig. 1, the ball seat (6) has an annular pressing member (8), a spring (9), and an extrusion screw (10) which are arranged from bottom to top in the following order, and a connecting rod (5) runs through the center of the members.

The spring (9) is pressed against the ball seat (6) from above by a pressing member (8) by the ability to actuate the force.

The pressing screw (10) is screwed to the valve body (3), and the length of the spring (9) can be changed by adjusting the position of the pressing screw in the up and down direction, thereby adjusting the actuating force of the spring (9).

The holder (7) is provided at four positions spaced apart by 90° in the circumferential direction of the sphere (4) so as to cover the sphere (4), and is fitted into the opening of the ball seat (6). The holder (7) is formed of a metal material such as stainless steel, and is disposed in contact with the ball seat (6), and has a function of suppressing deformation of the ball seat (6) caused by the upper pressing. The function of the reinforcing material used. Further, the holder (7) has a cylindrical shape and may have a rectangular tubular shape.

The end portion of the holder (7) on the valve body (3) side is provided with a semicircular projection (71) that protrudes outward (outside in the radial direction) from the outer peripheral end portion, and the projection portion (71) is as shown in the figure. 2 is set in 2 locations. As shown in an enlarged view of an important part of the holder (7) and the ball seat (6) of Fig. 3(a), the holder (7) is fitted to the opening of the ball seat (6), whereby the protrusion is made The surface (711) on the spherical side of (71) is in contact with the notch portion (61) of the ball seat (6). Therefore, the holder (7) is not pressed to the side of the sphere (4) from the position at which the ball seat (6) abuts, so that the holder (7) and the sphere can be prevented. (4) contact, and the sphere (4) is not caused by the contact (7) contacting the sphere (4). Therefore, the durability of the sphere (4) becomes excellent.

Further, since the opening portion of the ball seat (6) has a slightly cylindrical shape, in other words, since the ball seat (6) does not have the protruding portion (E) as shown in Fig. 7, the ball (4) and the holder ( 7) There is no need to configure the tee (6) between them, and it will not cause the flow rate to drop due to the deformation of the tee (6) which occurs in the case of configuration. Therefore, the ball valve (1) can often supply the fluid in a quantitative amount, and rarely causes the flow rate to become smaller as time passes. In addition, the shape of the ball seat (6) can be simplified, and the work efficiency of the ball seat production can be improved.

It is preferable that the protruding portion (71) of the holder (7) and the notch portion (61) of the ball seat (6) abut against each other to form a curved shape. Thereby, in addition to being able to prevent the contact of the ball (4) with the holder (7), damage to the ball seat (6) can be prevented.

The holder (7) is provided at an interval of 90 in the circumferential direction of the sphere (4) so as to cover the sphere (4). 4 places. In the case of having a part of the flow path of the inlet flow path (21) or the outlet flow path (22) forming the valve body (3), and in the case of not having the flow path, the shape of the holder (7) of both is not identical.

Fig. 4 is a view showing a holder (7) having a flow path, Fig. 4(a) is a front view, Fig. 4(b) is a cross-sectional view, and Fig. 4(c) is a plan view. Fig. 5 is a view showing a holder (7) having no flow path, Fig. 5(a) is a front view, Fig. 5(b) is a cross-sectional view, and Fig. 5(c) is a plan view. In the case where the holder (7) is disposed at a position facing the flow path of the valve body (3), the holder (7) is in the shape of a cylinder having a flow path as shown in Fig. 4; in the holder (7) In the case where it is disposed at a position other than the flow path of the valve body (3), the holder (7) is a slightly cylindrical shape having no flow path as shown in FIG. The holder (7) is provided so as to cover the sphere (4), and a spherical recess (72) is formed on the surface facing the sphere (4).

For the ball valve according to the present invention, although only the two-way valve shown in FIG. 1 has been described so far, the present invention is not limited thereto, and the present invention may also be a three-way valve or a four-way valve. valve. Fig. 6 is a view showing a ball and a holder used in the ball valve according to the present invention. Fig. 6(a) is a two-way valve, Fig. 6(b) is a three-way valve, and Fig. 6(c) is a four-way valve.

The holder (7) is provided in four places spaced apart by 90 in the circumferential direction of the sphere (4) so as to cover the sphere (4). In the case where the ball valve (1) is a two-way valve, as shown in Fig. 6 (a), a cylindrical shape is provided in two places where the inlet flow path (21) and the outlet flow path (22) are formed. In the case of the member (7), a cylindrical holder (7) is provided on two places which are not the flow paths. In the case of the three-way valve, as shown in Fig. 6(b), a cylindrical holder (7) is provided on three places. In the case of the four-way valve, as shown in FIG. 6(c), a cylindrical holder (7) is provided at four places.

When the ball valve of the two-way valve, the three-way valve, and the four-way valve is manufactured, the ball seat can be simplified by designing the shape of the ball seat (6) to be the same and only the shape of the holding member (7) is designed to be different ( 6) Production.

The protrusions (71) of the holder (7) may be provided only in one place, but may be provided in two places. In the case where one space is provided at the upper portion of the holder (7), it is possible to prevent an error in the combination of the holders when the ball valve is assembled. In the case where the plurality of places are provided with the protrusions (71), since the contact area of the holder (7) and the ball seat (6) becomes large, the holder (7) is difficult to be removed from the ball seat (6). The position abutting is pressed to the side of the sphere (4), so that the contact of the holder (7) with the sphere (4) can be surely avoided.

Further, the protruding portion (71) may be an annular shape provided to surround the outer peripheral end portion of the holder, in which case the opening portion of the ball seat (6) is provided to be engageable with the protruding portion (71). A circular cutout portion (61). Thereby, the shape of the holder (7) can be simplified, the shape of the ball seat (6) can be simplified, and the work efficiency of the ball seat production can be improved.

The present invention can be utilized as a universal ball valve that allows and interrupts the flow of fluid.

1‧‧‧Ball valve

2‧‧‧ flow path

3‧‧‧ valve body

4‧‧‧ sphere

5‧‧‧ Connecting rod

6‧‧‧ tee

7‧‧‧ Holder

8‧‧‧Extrusion members

9‧‧‧ Spring

10‧‧‧ Pressurized screw

11‧‧‧Operator

21‧‧‧Inlet runner

22‧‧‧Export flow channel

41‧‧‧through holes

Claims (3)

A ball valve is characterized in that: the ball valve comprises a valve body, a ball body, an operating mechanism, a connecting rod, a ball seat and a holding member; wherein the valve system has an inlet flow path, an outlet flow path, and a connection between the flow paths An internal space; the ball system is disposed in the inner space and is configured to switch the flow path by rotating around a reference axis; the operating mechanism rotates the ball around a reference axis; the connecting rod is used to link the foregoing operation a mechanism and the spherical body; the ball seat is disposed in the internal space so as to surround the periphery of the spherical body, and has an opening portion having a substantially cylindrical shape on a side surface; and the holder is embedded in the opening of the spherical seat And a holder having a protrusion protruding outward from the outer peripheral end portion at the end portion on the valve body side; the ball seat having a notch portion provided to be fitted to the protrusion portion The holder is fitted to the opening such that an end surface of the protrusion on the spherical body side abuts against the notch portion of the ball seat; Holding the ball member is not in contact with the system, and there is no object between the holding member and the ball. The ball valve according to claim 1, wherein the holder has the protrusions only at an upper portion with respect to the flow path. The ball valve according to claim 1, wherein the protrusion portion is provided in an annular shape surrounding the outer peripheral end portion of the holder.