JPH08210532A - Switching three-way valve - Google Patents

Abstract

(57) [Abstract] [Purpose] When the valve element in the first port is in close contact with one of the valve seats, it prevents the fluid flowing from the fluid inlet into the first port from leaking to the fluid outlet side. . [Configuration] Two fluid inlets 11, 12, one fluid outlet 13,
A valve box 16 having a first port 14 for communicating one fluid inlet 11 and a fluid outlet 13 and a second port 15 for communicating the other fluid inlet 12 and a fluid outlet 13 is provided. Valve seats 17 and 18 are provided in the middle of both ports 14 and 15 so as to face the fluid inlet sides 11 and 12, respectively. Valve seat 1 in both ports 14 and 15
The valve body 2 is located on the part closer to the fluid inlet 11 and 12 than 7 and 18, respectively.
1 and 22 are arranged and swingably attached to the valve box 16.
The two valve bodies 21, 22 are connected by the connecting member 23 so that when one of the valve bodies 21 comes into close contact with the valve seat 17, the other valve body 22 is separated from the valve seat 18. An air cylinder (24) is provided for swinging one of the valve bodies (21) between a position in close contact with the valve seat (17) and a position separated from the valve seat (17).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switching three-way valve.

[0002]

2. Description of the Related Art For example, a method for producing a sulfur trioxide by passing a gas mixture containing sulfur dioxide and oxygen through a stationary catalyst bed to oxidize the sulfur dioxide, and the flow direction of the gas mixture passing through the stationary catalyst bed. Is known (see Japanese Patent Publication No. 60-18604). This method is a so-called unsteady oxidation process.

An apparatus shown in FIG. 3 is considered as an apparatus for carrying out this method. In FIG. 3, the apparatus for producing sulfur trioxide is a catalyst bed (1) having a known catalyst such as a vanadium-based catalyst, and one end of which is provided with sulfur dioxide and oxygen via an inlet side three-way valve (2). Two gas mixture flow pipes connected to the gas mixture supply pipe (3) containing it and the other end to the catalyst bed (1) respectively
(4) and (5), one end is connected to the sulfur trioxide-containing gas delivery pipe (7) through the outlet side switching three-way valve (6), and the other end is 2
It is provided with two sulfur trioxide-containing gas flow pipes (8) and (9) which are respectively connected to one gas mixture flow pipe (4) (5). One gas mixture flow pipe (4) is connected to one end of the catalyst bed (1), and the other gas mixture flow pipe (5) is connected to the other end of the catalyst bed (1).

Although not shown, the inlet side switching three-way valve is
A valve box having one fluid inlet, two fluid outlets, a first port communicating the fluid inlet with one fluid outlet, and a second port communicating the fluid inlet with the other fluid outlet; Two valve seats that are respectively provided on the way toward the fluid inlet side, and are disposed in the portion closer to the fluid inlet side than the valve seat in the valve box and are swingably attached to the valve box and are respectively attached to both valve seats. One valve body that can be in close contact,
The air cylinder is configured to swing the valve body between a position in which the valve body is in close contact with one valve seat and a position in which the valve body is in close contact with the other valve seat.
A supply pipe is connected to the fluid inlet of the inlet side switching three-way valve, and a gas mixture flow pipe is connected to each fluid outlet.

Conventionally, the one shown in FIG. 4 has been used as the outlet side switching three-way valve (6). That is, the conventional outlet side switching three-way valve (6) has two fluid inlets (50) (51), one fluid outlet (52), one fluid inlet (50) (51) and a fluid outlet (52).
A first port (53) communicating with and the other fluid inlet
A valve box (55) having a second port (54) communicating the (51) and the fluid outlet (52), and facing the fluid outlet (52) side in the middle of both ports (53) (54). The valve seats (56) (57) provided and the valve seat (55) are respectively arranged on the fluid outlet (52) side of the valve seats (56) (57) and rotate on the valve housing (55). One valve seat (59), which is swingably attached by the shaft (58) and can be in close contact with both valve seats (56) and (57), and one valve seat (59), is attached to one valve seat (56). It is composed of an air cylinder (60) which is swung between a close contact position and a position close to the other valve seat (57). Then, each fluid inlet (50) (5) of the outlet side switching three-way valve (6)
The sulfur trioxide-containing gas flow pipes (8) and (9) are connected to 1), and the sulfur trioxide-containing gas delivery pipe (7) is connected to the fluid outlet (52). One end of the rotary shaft (58) that attaches the valve body (59) to the valve box (55) projects outside the valve box (55) by a predetermined length, and the lever (61) is provided around the tip of the valve. The base end portion of is fitted and fixed. The tip of the piston rod (60a) of the air cylinder (60) is rotatably attached to the tip of the lever (61). Therefore, the operation of the air cylinder (60) causes the lever
The rotary shaft (58) is rotated via the (61), whereby the valve body (59) swings.

In the apparatus shown in FIG. 3, when producing sulfur trioxide, the inlet side switching three-way valve and the outlet side switching three-way valve are switched so that the flow path becomes the direction shown by the solid line arrow in FIG. To Then, the gas mixture containing sulfur dioxide and oxygen passes from the supply pipe (3) through the inlet side switching three-way valve (2) and one of the mixed gas flow pipes (4) to the catalyst bed.
It flows into the catalyst bed (1) from one end of (1). Then, in the catalyst bed (1), the mixed gas comes into direct contact with the catalyst, and sulfur dioxide and oxygen react with each other to generate sulfur trioxide. Then, the sulfur trioxide-containing gas passes through the sulfur trioxide-containing gas flow pipe (9) and is sent out from the delivery pipe (7) through the outlet side switching three-way valve (6).

After a predetermined time has elapsed, the inlet side switching three-way valve
(2) and the outlet side switching three-way valve (6) are switched so that the flow path is in the direction shown by the broken arrow in FIG. Then, the gas mixture containing sulfur dioxide and oxygen passes from the supply pipe (3), the inlet side switching three-way valve (2), the other mixed gas flow pipe (5), and from one end of the catalyst bed (1) to the catalyst bed (1). 1) Inflow into. Then, in the catalyst bed (1), the mixed gas comes into direct contact with the catalyst, and sulfur dioxide and oxygen react with each other to generate sulfur trioxide. Then, the sulfur trioxide-containing gas is sent out from the delivery pipe (7) through the sulfur trioxide-containing gas flow pipe (8) and the outlet side switching three-way valve (6).

[0008]

However, in the device shown in FIG. 3, as the outlet side switching three-way valve (6), as shown in FIG.
When the one shown in is used, there are the following problems.

That is, the valve element (59) has one of the valve seats (56).
When the valve body (59) is in close contact with the valve seat (59), a pressure is applied to the valve body (59) to separate it from the valve seats (56) and (57) by the mixed gas containing sulfur dioxide and oxygen. Therefore, the mixed gas may leak.

An object of the present invention is to provide a switching three-way valve that solves the above problems.

[0011]

SUMMARY OF THE INVENTION A switching three-way valve according to the present invention comprises two fluid inlets, one fluid outlet, a first port communicating one fluid inlet with the fluid outlet, and the other fluid inlet with the fluid outlet. And a valve seat having a second port for communicating with each other, a valve seat provided in the middle of both ports facing the fluid inlet side, and a valve seat disposed in both ports on the fluid inlet side of the valve seat. And two valve bodies swingably attached to the valve box, and a connection for connecting both valve bodies so that when one of the valve bodies comes into close contact with the valve seat, the other valve body is separated from the valve seat. The member and one of the valve bodies,
The drive source is configured to swing between a position in close contact with the valve seat and a position separated from the valve seat.

[0012]

When the valve body in the first port is in close contact with one of the valve seats, the valve body tries to be in close contact with the valve seat by the fluid flowing from the fluid inlet into the first port. Pressure is applied.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

1 and 2, the switching three-way valve (10)
Is two fluid inlets (11) (12), one fluid outlet (13), a first port (14) for communicating one fluid inlet (11) with the fluid outlet (13) and the other fluid inlet A valve box (16) having a second port (15) communicating the (12) and the fluid outlet (13), and the fluid inlet (11) (12) side in the middle of both ports (14) (15), respectively. And the valve seats (17) and (18) facing each other, and the two parts (14) and (15) located on the fluid inlet (11) (12) side of the valve seats (17) and (18), respectively. And two valve elements (21) and (22) that are swingably attached to the valve box (16) by the rotating shafts (19) and (20), and one of the valve elements (21) has a valve seat (17). ), So that the other valve body (22) is separated from the valve seat (18) when the two valve bodies (21) (22)
And a connecting member (23) for connecting the valve body (21) (2
It is composed of an air cylinder (24) (driving source) for swinging 2) between a position in close contact with the valve seats (17) and (18) and a position separated from the valve seats (17) and (18).

One end of the rotary shaft (19), on which one valve body (21) is attached to the valve box (16), projects outward from the valve box (16) by a predetermined length, and its tip end The intermediate portion of the lever (25) is fitted and fixed around the periphery. The tip of the piston rod (24a) of the air cylinder (24) is rotatably attached to one end of the lever (25). Further, one end of a connecting member (23) is rotatably connected to the other end of the lever (25).

The other end of the rotary shaft (20), on which the other valve body (22) is attached to the valve box (16), projects outward from the valve box (16) by a predetermined length, and its tip end The base end of the lever (26) is fitted and fixed to the periphery. The other end of the connecting member (23) is rotatably attached to the tip of the lever (26). The connecting member (23) has male screw members (27) and (28) rotatably attached to both levers (25) and (26), and both ends screwed to the male screw members (27) and (28), respectively. Consists of a turnbuckle (29). Then, by operating the air cylinder (24), the lever (25)
The rotary shaft (19) is rotated via the
1) is designed to swing. At the same time, the other valve body (22) is also swung via the connecting member (23).

When the switching three-way valve (10) is used in the apparatus for producing sulfur trioxide shown in FIG. 3, the sulfur trioxide-containing gas flow pipes (8) and (9) are connected to the fluid inlets (11) and (12). The sulfur trioxide-containing gas delivery pipe (7) is connected to the fluid outlet (13).

[0018]

As described above, according to the switching three-way valve of the present invention, when the valve body in the first port is in close contact with one valve seat, the valve body is connected to the first through the fluid inlet. The fluid that has flowed into the port exerts a pressure to bring it into close contact with the valve seat, so that the fluid that has flowed into the first port from the fluid inlet is prevented from leaking to the fluid outlet side. Therefore, when this switching three-way valve is used for the outlet side switching three-way valve of the sulfur trioxide manufacturing apparatus shown in FIG. 3, leakage of a mixed gas containing sulfur dioxide and oxygen is prevented.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of a switching three-way valve according to the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a schematic diagram showing an apparatus for producing sulfur trioxide.

FIG. 4 is a vertical cross-sectional view showing a conventional outlet side switching three-way valve used in a sulfur trioxide manufacturing apparatus.

[Explanation of symbols]

 (10) Switching three-way valve (11) Fluid inlet (12) Fluid inlet (13) Fluid outlet (14) First port (15) Second port (16) Valve box (17) Valve seat (18) Valve seat (21) Valve body (22) Valve body (23) Connecting member (24) Air cylinder (drive source)

Claims (1)

[Claims] 1. A valve box having two fluid inlets, one fluid outlet, a first port communicating one fluid inlet with the fluid outlet, and a second port communicating the other fluid inlet with the fluid outlet. A valve seat that is provided in the middle of both ports facing the fluid inlet side, and a valve seat that is disposed in a portion of the both ports closer to the fluid inlet than the valve seat and is swingably attached to the valve box. The two valve bodies, a connecting member that connects the two valve bodies so that the other valve body separates from the valve seat when one of the valve bodies comes into close contact with the valve seat, and one of the valve bodies A switching three-way valve consisting of a drive source that swings between a position in close contact with the seat and a position separated from the valve seat.