WO2012005134A1

WO2012005134A1 - Ball valve

Info

Publication number: WO2012005134A1
Application number: PCT/JP2011/064678
Authority: WO
Inventors: 誠夫楯野; 也寸志竹内; 雅裕田中
Original assignee: 日本ボールバルブ株式会社
Priority date: 2010-07-09
Filing date: 2011-06-27
Publication date: 2012-01-12
Also published as: JP2012017826A; CN102985731B; JP5508970B2; CN102985731A

Abstract

This ball valve prevents leak out of powder and granular material from the clearance between a seat ring and a valve body which is considered to possibly occur when a type of a ball valve moving the seat ring away from or closer to the valve body is used to pneumatically transport the powder and granular material, thereby eliminating a phenomenon in which the leaked powder and granular material bites into the sliding clearance around the valve body. The ball valve which has the seat ring (5) to block the sliding clearance around the valve body (4) by being pressed against the valve body (4), the seat ring (5) being moved away from the valve body (4) during opening or closing operation of a valve part, is provided with a purging ring (8) which surrounds the outer circumference of the clearance generated between the valve body (4) and the seat ring (5) moved away from the valve body, and jets externally-supplied air toward the clearance.

Description

Ball valve

The present invention is a so-called non-sliding type ball valve which reduces the operating torque of the valve by causing the seat ring pressed against the valve body to move away from the valve body when opening and closing the valve part. The invention relates to a ball valve with increased appropriateness for switching pipelines.

A ball valve (metal touch ball) which presses a seat ring against a valve body (ball) inserted into a valve chamber to close a sliding gap on the outer periphery of the valve body and blocks communication between the valve chamber and the port via the sliding gap Among the so-called valves), there are some which make the seat ring move away from the valve body when opening and closing the valve portion to reduce the operating torque of the valve (for example, see Patent Document 1 below).

In the ball valve disclosed in Patent Document 1, the seat ring has a piston structure so that pressing on the valve body and pulling away from the valve body can be performed by fluid pressure. Two pressure chambers that apply fluid pressure in opposite directions to the seat ring are formed on the outer periphery of the seat ring, and when fluid pressure is introduced into one pressure chamber, the seat ring is pressed against the valve body, When fluid pressure is introduced into the other pressure chamber, the seat ring separates from the valve body.

In addition, even if the seat ring is separated from the valve body, sliding occurs at the portion where the valve body is supported. Therefore, although the ball valve of the above-mentioned structure can not be said to be strictly a non-sliding valve, for convenience of explanation, it is referred to as a non-sliding valve here.

Japanese Utility Model 7-10139

In the non-sliding ball valve of the above structure, the seat ring is separated from the valve body when the opening and closing operation is performed. Metal touch ball valves are widely used for pneumatic transport equipment of particulates, but in pneumatic transport of particulates, particulates being transported from the gap created between the two when the seat ring separates from the valve body There is a concern that the fuel may leak and bite into a sliding gap or the like, and this has led to the use of a non-sliding type ball valve in pneumatic transportation of powder and granular materials.

The present invention prevents the leakage of particulate matter from the gap between the seat ring and the valve body, which is a concern when using a ball valve of a type in which the seat ring is in contact with and separated from the valve body for pneumatic transport of particulate matter. It is an object of the present invention to eliminate the phenomenon that the leaked granular material bites into the sliding gap of the valve body and the like.

In order to solve the above-mentioned subject, this invention has a seat ring which presses against the valve body in a valve chamber, and seals a sliding crevice on the outer periphery of a valve body, and the seat ring is made to separate from the valve body. A ball valve that performs opening and closing operations is provided with a purge ring that jets air supplied from the outside toward the gap, surrounding the outer periphery of the gap generated between the valve body and the seat ring separated from the valve body. The
The valve chamber is provided inside the valve body, and the purge ring is arranged in the valve chamber so as not to impede the movement of the valve body.

Such ball valves can be considered as listed below as specific embodiments.
(1) The seat ring is provided only between the valve chamber and the port on the inlet side, and the purge ring is installed on the outer periphery of the position where the seat ring abuts on the valve body.
(2) The seat rings are provided between the valve chamber and the port on the inlet side and between the valve chamber and the ports on the outlet side (where the number is n, n is an integer including 1) The said purge ring was each installed in the outer periphery of the position where it abuts on the said valve body.
(3) A pressure chamber is provided between the seat ring and the valve body to exert a fluid pressure on the seat ring, and the pressure of the fluid introduced into the pressure chamber causes the seat ring to be at least a valve body To promote in the direction away from.
(4) A multi-way valve provided with three or more ports. The multi-way valve referred to here is a three-way valve, a four-way valve or the like having three or more ports to which connection is switched.

The pressing of the seat ring against the valve body can also be performed by applying fluid pressure to the seat ring. In this case, two pressure chambers are provided for each seat ring, and the introduction of fluid pressure introduced into each pressure chamber is switched to selectively generate thrust in opposite directions on the seat ring. Leave it.

The pressing of the seat ring against the valve body can also be performed by the force of an elastic body. If the elastic body is compressed when the seat ring is propelled by the fluid pressure introduced into the pressure chamber to move away from the valve body, the elastic restoring force of the elastic body when the pressure chamber is depressurized is used. The seat ring can be pressed against the valve body.

The ball valve according to the present invention is provided with a purge ring that blows air into the valve chamber, and injects air toward a gap formed between the valve body and the seat ring when the seat ring separates the valve body. Can.

The air flows from the gap into the passage in the valve, and the air flow pushes back the granular material in the passage which is about to leak out from the gap together with the air for transportation. For this reason, the leakage of the granular material during transportation from the gap is prevented, and it is difficult for the leaking granular material to bite into the sliding gap or the like. This makes it possible to use the non-sliding ball valve, which is the subject of the present application, for the pneumatic conveying installation of granular material.

The actions and effects of the ball valve listed above as a specific form will be described later.

A cross-sectional view showing an example of the ball valve of the present invention cut along a plane parallel to the axis of the port and also parallel to the axis of the valve body Partially broken left side view of the ball valve of FIG. 1 Sectional view of position along line III-III in FIG. 1 View of purge ring along line IV-IV in FIG. 3 FIG. 6 is a cross-sectional view showing another example of the ball valve of the present invention along a plane parallel to the axis of the port and also parallel to the axis of the valve body FIG. 6 is a cross-sectional view showing still another example of the ball valve according to the present invention along a plane parallel to the axis of the port and perpendicular to the axis of the valve disc

Hereinafter, an embodiment of the ball valve of the present invention will be described based on FIGS. 1 to 6 of the attached drawings. 1 to 4 show the first embodiment. The ball valve 1 of the first embodiment is configured as a two-way valve, and includes a valve body 2, a bonnet 3, a valve body (ball) 4, a seat ring 5, a seat receiver 6, a torque actuator 7, and the present invention The purge ring 8 that characterizes is combined.

The valve body 2 has a valve chamber 9 and two ports 10 _-1 and 10 _-2 provided coaxially with the valve chamber interposed therebetween, and the valve body 4 is inserted into the valve chamber 9 There is.

The valve body 4 is disposed at a position orthogonal to the axis of the valve hole 11 communicating the ports 10 _-1 and 10 _-2 with the axis of the valve hole and at a position shifted by 180 ° with respect to the center of the valve hole It has two spindles 12 _-1 and 12 _-2 .

Support shaft _{12 -1,} bearing _{13 -1} Thus assembled the bonnet 3, the support shaft _{12 -2,} the bearing _{13 -2} assembled to the valve body 2, respectively supported, the extension of the support shaft _{12 -1} It is drawn out of the bonnet 3 as an input part, and the output shaft of the torque actuator 7 is connected there. _Reference numerals 14 _-1 and 14 _{-2 in} FIG. 1 denote thrust bearings.

The seat ring 5 is incorporated in the port 10 _-1 . The seat ring 5 is composed of the side facing the valve chamber 9 small diameter, as a ring piston combined with the opposite side to the large diameter, and is slidably inserted into the port 10 _-1.

The opening of the port 10 _-1 and seat holder 6 is screwed, the seat ring 5 is held in the port 10 in _-1 by the sheet receiver 6.

In the seat ring 5, the small diameter portion and the outer diameter of the large diameter portion are respectively sealed by O-rings, and further, the small diameter portion of the tip of the sheet receiver 6 inserted inside the large diameter portion and the inner circumference of the large diameter portion. The interface between is also sealed with an O-ring. Thus, the end surface faces the position of the large diameter side of the position and the seat ring 5 that the stepped surface of the outer periphery of the seat ring 5 faces the pressure chamber 15 _-1 which is hermetically sealed respectively 15 _-2 are produced .

A fluid pressure such as air pressure is introduced to the pressure chambers 15 _-1 and _15-2 via a solenoid valve (not shown). When fluid pressure is introduced into the pressure chamber _15-2 when the valve body 4 is in the closed position, the seat ring 5 advances and is pressed against the valve body 4, and the sliding gap between the valve body 4 and the seat ring 5 And the communication through the sliding gap of the ports 10 _-1 and 10 _-2 is cut off.

Moreover, the introduction of fluid pressure in the pressure chamber 15 _-1 depressurized pressure chamber 15 _-2, the seat ring 5 is separated from the valve element 4, allowing rotating operation of the valve body 4 in the low torque.

The illustrated torque actuator 7 is pneumatically driven. By switching the air introduction state, the drive direction is reversed, and the valve body 4 is rotated from the valve opening position to the valve closing position or vice versa.

The purge ring 8 is formed by providing a large number of small injection holes (not shown) at an appropriate interval on the inner peripheral side of the hollow pipe. The injection hole may be a slit continuous in the circumferential direction, a slit intermittently arranged in the circumferential direction, or the like, and is not limited to the small hole.

The purge ring 8 is disposed in the valve chamber 9 so as to surround the outer periphery of a gap g (see FIG. 3) generated between the valve body 4 and the seat ring 5 separated from the valve body. An air inlet 16 is provided in the valve body 2, and air supplied from the outside flows from the inlet 16 into the purge ring 8 and is jetted from the injection hole of the purge ring 8 toward the gap g. .

In the ball valve 1 of FIG. 1 configured as described above, in the pipeline (not shown) included in the pneumatic transportation facility for the granular material, the granular material and the air for transportation are from above and below. the portion (such as standing pipe portion and the inclined pipe portion) flows toward the upper port 10 _-1 (inlet) port _10-2 is incorporated in the direction to be lower (outlet).

The ball valve 1 separates the seat ring 5 from the valve body 4 to switch the open / close state. At that time, a gap g shown in FIG. 4 is formed between the valve body 4 and the seat ring 5. When the granular material is transported on an air stream and the gap g is created, the granular material tries to leak out from the clearance together with the air for transportation. Therefore, air is ejected from the purge ring 8 to prevent leakage from the gap g.

The ball valve 1 shown in FIG. 1 has port 10 _-1 up and port 10 _-2 down, and the powder particles pass from port 10 _-1 to port 10 _-2. Is provided only on the inlet side, and there is no seat ring and purge ring on the outlet side.

When the granular material is transported from the top to the bottom, as shown in FIG. 1, it is more convenient that there is no seat ring or purge ring on the outlet side. If there is no seat ring or purge ring on the outlet side, there is no space for the particulate matter to stay inside the valve chamber, so even if the particulate matter leaks from the gap created between the valve body and the seat ring Because the leaked granular material flows to the outlet.

Figure 5 is a ball valve of the second embodiment, even in the port _10-2 side becomes the outlet, which is provided to the port 10 _-1 side the same seat ring 5 and the seat holder 6 and the purge ring 8 and the sheet Pressure chambers 15 _-1 and 15 _-2 for applying thrust to the ring 5 are provided.

The ball valve 1 of the second embodiment has no directionality of assembly, and the same function is exhibited no matter which of the ports 10 _-1 and 10 _-2 is set as the inlet, so that erroneous assembly does not occur.

The attitude of the ball valve 1 of the second embodiment is not limited when assembled to the pipeline, and therefore, the ball valve 1 can be assembled anywhere on the upstanding piping portion, the inclined piping portion, and the horizontal piping portion of the pipeline. Moreover, it can install also in the location where granular material is transported upward from the bottom.

FIG. 6 is a ball valve of a third embodiment configured as a three-way valve. In the third embodiment, the ball body 2 is provided with three ports. Of the ports _10-1 to _10-3 , the port _10-1 is used as an inlet, and the ports _10-2 , _10-3 are used as a branch outlet.

The seat ring 5 similar to the one provided on the port _10-1 side of the ball valve in FIG. 1, the seat receiver 6, the purge ring 8, and the seat ring 5 for each of the ports 10 _-1 to 10 _-3 There are provided pressure chambers 15 _-1 and 15 _-2 for applying

The ball valve 1 of FIG. 6 is configured as a valve having a branch angle of 45 °, and when the valve body 4 is rotated in the clockwise direction by 67.5 ° from the position of the figure, the ports 10 _-2 and 10 _-3 are ports. When it is separated from 10 _-1 and the valve body 4 is further rotated clockwise therefrom by 67.5 ° (135 ° from the position of FIG. 6), the port 10 _-1 communicates with the port 10 _-3 .

The switching of the connection is performed by separating each seat ring 5 from the valve body 4. At this time, air is jetted from the purge ring 8 to prevent the leakage of the powder.

The present invention can also be applied to a three-way valve having a branch angle of 60 °, a four-way valve having a larger number of ports, and the like.

The pressing of the seat ring 5 against the valve body 4 can also be performed by the force of an elastic body. For example, when the pressure chamber _15-2 in FIG. 1 is replaced with an atmosphere chamber, and an elastic body such as a disc spring is incorporated into the atmosphere chamber and the elastic body propels the seat ring 5 by fluid pressure to separate from the valve body 4. if so as to be compressed, the seat ring 5 by an elastic restoring force of the elastic body when the pressure chamber 15 _-1 was depressurized can be pressed against the valve body 5.

In addition, although the illustrated ball valve has all the seat rings 5 formed of metal, the ball valve provided with a seat ring whose contact portion with the valve body 4 is formed of an elastic body such as rubber is also the invention Subject to

Further, in each of the illustrated ball valves, the valve body 2 and the bonnet 3 are formed of cast stainless steel, and the valve body 4, the seat ring 5, the sheet receiver 6, and the purge ring 8 are formed of stainless steel, respectively. It is not an essential requirement that the material of the component of is stainless steel.

DESCRIPTION OF SYMBOLS 1 ball valve 2 valve body 3 bonnet 4 valve body 5 seat ring 6 seat receiver 7 torque actuator 8 purge ring 9 valve chamber 10 _-1 to 10 _-3 port 11 valve hole 12 _-1 , _12-2 spindle 13 _-1 , 13 _-2 bearing ₁₂ -1, _{12 -2} shaft ₁₅ -1, _{15 -2} pressure chamber 16 air inlet openings

Claims

It has a seat ring (5) which presses against the valve body (4) in the valve chamber (9) to close the sliding gap on the outer periphery of the valve body, and the seat ring (5) is separated from the valve body (4) In the ball valve that opens and closes the valve portion,
Air supplied from the outside is wrapped around the outer periphery of the gap (g) generated between the valve body (4) and the seat ring (5) separated from the valve body in the valve chamber (9). A ball valve characterized in that a purge ring (8) is provided which jets toward a gap (g).
The seat ring (5) is provided only between the valve chamber (9) and the port (10 -1 ) on the inlet side, and the outer periphery of the position where the seat ring (5) abuts on the valve body (4) The ball valve according to claim 1, wherein the purge ring (8) is installed on the side.
The seat ring (5) is disposed between the valve chamber (9) and the inlet port (10 -1 ) and between the valve chamber (9) and the outlet port (10 -2 to 10 -n ). The ball valve according to claim 1, wherein the purge ring (8) is disposed on an outer periphery of a position where each seat ring (5) abuts on the valve body (4).
Between the seat ring (5) and the valve body (2), there is provided a pressure chamber (15) for applying fluid pressure to the seat ring (5),
The sheet ring according to any one of claims 1 to 3, wherein the seat ring (5) is propelled at least in a direction away from the valve body (4) under the pressure of the fluid introduced into the pressure chamber (15). Ball valve.
The ball valve according to any one of claims 1 to 4, wherein the ball valve is configured as a multi-way valve including three or more ports (10).