JPH0246820B2 - CHOSETSUBEN - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a two-way or three-way flow control valve. Furthermore, by incorporating two valve bodies and operating them with a single valve stem, it has control functions such as opening/closing, adjusting or switching the flow path, and adjusting the flow distribution ratio or mixing ratio. Furthermore, the present invention relates to a two-way valve or a three-way valve with excellent shutoff characteristics.

Three-way valves are used to mutually adjust the flow paths on three sides, and there are two types: a mixed type and a split type. Figures 4 and 5 are typical examples of conventional three-way valves.
Figure 5 shows a split type three-way valve.

In FIG. 4, by moving the valve stem 3 up and down, the position of the plug 25 is moved, the flow rate ratio between A and B in the figure changes, and the mixing ratio of the flow rates on the outflow side AB changes.

In FIG. 5, as the valve stem 23 moves up and down, the position of the plug 30 moves, and the flow path cross-sectional area ratio to the outflow side pipe changes, and the fluid on the flow rate side CD changes to the outflow side C according to the cross-sectional area ratio. , D.

Although these conventional three-way valves can adjust the flow rate ratio, they are structurally incomplete in their closing function, and are generally used with a separate stop valve connected in series. Furthermore, when adjusting the flow rate, the valve seat that faces the valve body has a part that comes into contact with the passing fluid and a part that comes into contact with the valve body, and the wear and tear of the valve seat is uneven, making it impossible to completely close when closing. be. The present invention overcomes these drawbacks of conventional three-way valves and provides three-way and two-way valves that can be used in both mixing and dividing applications, and which also have an excellent closing mechanism.

Therefore, in the present invention, one valve has two valve bodies that share one rotating shaft, and one valve body can fully open, fully close, or optionally open one flow path for the fluid flowing inside the valve. The other valve body can arbitrarily adjust the opening of one of the two channels from fully closed to fully open, and at the same time adjust the opening of the other channel from fully open to fully closed. It was made possible to do so. In the above, both valve bodies were formed into an appropriate ball valve body shape, and formed into a double structure in which one valve body was located within the other valve body.

Furthermore, in order to stabilize the position of the valve body, a valve body support sheet is provided, and the valve seat that faces the valve body, which plays the role of fully opening or fully closing, is made of rubber,
It is made of a soft material such as PTFE, and the valve seat that faces the valve body for flow rate adjustment is made of a hard material such as metal or ceramics.

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

FIG. 1 shows an embodiment of the present invention in which the valve body is an L-shaped three-way valve. The valve body 12 is integrally constructed with the valve stem 8 and is housed within the valve body 3, forming a double valve body structure. That is, the valve body 12 is an inner valve body, and the valve body 3 is an outer valve body. The valve body 3 is supported by a seat ring 5 provided in a conduit of the valve body and a valve body support sheet 12 provided in the valve body. The seat ring 4 is provided in the flow path on the inner surface of the valve body 3, facing the valve body 12.

Also, the stopper 7 is integral with the valve stem 8 and the valve body 1
Both are one. The boss 6 is integral with the valve body 3 and transmits the rotation of the valve stem 8 to the valve body 3 via the stopper 7. The seat ring 14 is made of a hard material such as metal, and the seat ring 14 and the valve body 12 are in slight contact with each other. On the other hand, the seat ring 5 and the valve body support sheet 12 are made of a soft material such as rubber, and the contact surface pressure between them and the valve body 3 is large, and the reason why the contact resistance is against the rotation of the valve stem 8 will be explained later. To prevent fluid from leaking through the contact surface between the seat 5 and the valve body 3 without hindering the rotation of the valve body 3.

A 90° sector-shaped stopper 7 is provided on a part of the valve stem 8 so as to protrude from the valve stem 8, and then a semicircular boss 6, which is integrated with the valve body 3 and has, for example, a semicircular shape, is provided near the valve stem hole of the valve body 3. . If the angular relationship between the two is appropriately selected and designed in this way, the valve body 12 will always rotate with the rotation of the valve stem 8, and the valve body 3 will only rotate when the boss 6 hits the stopper 7 and is pressed. Rotate. In this example, the rotation angle range of the valve body 3 that is irrelevant to the rotation of the valve stem 8 is 90 degrees, but this is due to the rotation angle of the stopper 7.
The angle can be arbitrarily selected from 0 to 360° depending on the design of the boss 6.

In the above configuration, FIG. 1 shows that the stopper 7 is connected to the boss 6 due to the relationship between the stopper 7 and the boss 6.
At the same time, the valve stem 8 is rotated, and the valve body 3 is also rotated to open the upstream pipe F (not shown in this figure).
is shown in a closed state, indicating its use as a two-way valve. From this state, the valve stem 8 is rotated clockwise again, the valve body 3 is rotated 90 degrees, and the valve body 12 is rotated back 45 degrees to adjust the flow rate, as shown in FIG. In this case, the valve body 12 rotates slightly as the valve stem 8 rotates, and arbitrarily adjusts the cross-sectional area ratio of the upstream pipes E and F. downstream pipe EF
The flow rate can be adjusted arbitrarily. When both the upstream pipes E and F are closed, both pipes can be closed by the valve body 3 by turning the valve rod 8 by 180 degrees again with the stopper in effect.

In this example, it is illustrated as a mixed type three-way valve.
It goes without saying that if the EF pipe line is placed on the downstream side, it can be used as a split three-way valve, and it can also be used as a two-way valve in the state shown in Figure 1.

Further, the rotational position of the valve body 3 is fixed by the seat ring 5 and the valve body support sheet 12, but the position can be adjusted by connecting the seat ring 5 and the valve body support sheet 12 with screws or using a plate spring. It goes without saying that the performance will further improve if a mechanism is incorporated.

If the seat ring 5 and the seat ring 14 are made of hard metal, both the valve body 12 and the valve body 3 can be used at intermediate opening degrees, which is convenient for precise flow rate adjustment. However, since a hard seat ring is inferior to the above-mentioned seat ring made of a soft material in terms of sealing performance, the seat ring 5 supporting the sealing valve body 3 is made of a soft material. As described above, it is possible to obtain a three-way control valve that can be used for both mixing and dividing purposes with a single valve and also has an excellent closing function, and a two-way flow control valve with an excellent closing function. be able to.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of an L-type three-way valve showing an embodiment of the present invention, FIG. 2 is a view taken along the line A-A' in FIG. 1, and FIG.
The figure is an enlarged sectional view of section B in FIG. 1. FIG. 4 is a sectional view showing a conventional mixing type three-way valve, and FIG. 5 is a sectional view showing a conventional split type three-way valve. 1: Valve box, 2: Valve body, 3: Valve body, 4: Seat ring, 5: Seat ring, 6: Boss,
7: Stopper, 8: Valve stem, 12: Valve body support sheet.

Claims (1)

[Scope of Claims] 1. A single valve, comprising a valve body and two valve bodies having the same rotation axis and sharing one valve stem within the valve body,
The two valve bodies are ball-shaped valve bodies and have a double structure in which one ball-shaped valve body is housed within the other ball-shaped valve body, and the one inner valve body rotates as the valve stem rotates. The other outer valve body is free within a predetermined angle relative to the rotation of the valve stem, and the valve body is provided with a seat ring that supports the outer valve body, and the outer valve body is provided with a seat ring of the inner valve body. A control valve characterized by being provided with. 2. Claim 1 of the utility model registration claim is characterized in that the outer valve element fully opens or completely closes the flow path of the valve, and the inner valve element adjusts the flow rate of the valve flow path from fully open to fully closed. control valve. 3. Claim 2 of the claims for utility model registration is characterized in that the seat ring of the outer valve body provided in the valve box is made of a soft material, and the seat ring of the inner valve body provided in the outer valve body is made of a hard material. control valve.