JP3676483B2 - Control valve with condensate discharge function - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a regulating valve that is attached to a fluid piping system such as steam and adjusts the amount of fluid that passes through the valve, and in particular, can maintain the valve in a fully closed state and discharge the incoming condensate. It is related with the control valve which can do.
[0002]
[Prior art]
As a conventional control valve capable of discharging condensate, there is one disclosed in, for example, Japanese Patent Application Laid-Open No. 62-67395. This is equipped with an air / water separator consisting of a partition and a drain valve below the valve port, separating the air / water in the fluid flowing into the valve and automatically discharging only the condensate to the outside. It is a regulating valve that can do.
[0003]
[Problems to be solved by the invention]
In the above-mentioned conventional one, the condensate that has flowed in can be discharged, but there is a problem that the control valve port cannot be closed reliably. A control valve generally adjusts the flow rate by increasing or decreasing the valve opening with an actuator or the like, and even when the control valve is fully closed, the passage of fluid cannot be completely prevented. It is. Therefore, in order to completely close the fluid, a ball valve or the like is separately provided before and after the control valve. However, installing a plurality of such valves increases the installation space. Or there was a problem that the piping was complicated.
[0004]
Accordingly, an object of the present invention is to obtain a control valve that can completely close a valve with a simple configuration and can discharge condensate flowing into the valve to the outside.
[0005]
[Means for Solving the Problems]
The means of the present invention devised to solve the above problems includes a valve casing having an inlet, a regulating valve port and an outlet, and a regulating valve body for controlling the opening and closing of the regulating valve port in the valve casing. In the movably mounted one, a spherical three-way switching valve body is rotatably disposed between the inlet and the control valve port, and a substantially T-shaped passage is provided in the three-way switching valve body, and the substantially T-shaped By connecting each of the passages to the inlet, the control valve port and the external communication passage , attaching a substantially disc-shaped condensate discharge valve inside the three-way switching valve body, and rotating the three-way switching valve body, The inlet and the control valve port are communicated or blocked, and the condensate flowing in from the inlet is discharged to the outside through the condensate discharge valve .
[0006]
DETAILED DESCRIPTION OF THE INVENTION
By operating the spherical three-way switching valve body to connect the inlet and the control valve port, the fluid from the inlet flows down the control valve port and functions as a normal control valve. By shutting off the inlet and the control valve port with the three-way switching valve body, the control valve port is reliably closed not only with the control valve body but also with the three-way switching valve body. Further, the condensate flowing in from the inlet can be discharged to the outside from the condensate discharge valve inside the three-way switching valve body.
[0007]
As the condensate discharge valve, a steam trap that automatically discharges condensate as condensed water in the steam can be used. Various types of steam traps are used. In the present invention, known traps can be appropriately selected as long as they have a size or shape that can be accommodated in the three-way switching valve body. .
[0008]
【Example】
An embodiment showing a specific example of the above technical means will be described.
In FIG. 1, an inlet 2, a regulating valve port 3, and an outlet 4 are formed in a valve casing 1, and a flat regulating valve body 5 is disposed so as to face the regulating valve port 3. The control valve body 5 is arranged so as to be slidable in the vertical direction by an upper control valve rod 6. The state shown in FIG. 1 shows the case where the control valve body 5 is in the upper limit position. Although not shown, the control valve rod 6 is connected to a drive unit such as an electric motor or an air actuator. A spherical three-way switching valve body 7 is disposed between the inlet 2 and the control valve port 3 so as to be rotatable clockwise or counterclockwise, and a condensate discharge valve 8 is attached inside the three-way switching valve body 7.
[0009]
The three-way switching valve body 7 is provided with a substantially T-shaped passage 10 in the central portion, and each passage communicates with the inlet 2, the control valve port 3, and the external communication passage 16. The valve seat members 11 and 12 are arranged in an airtight manner. The valve seat members 11 and 12 are made of heat-resistant synthetic resin or the like, and ring members 13 and 14 are attached to the outer peripheral portions thereof to maintain airtightness. A plurality of disc springs 15 as elastic members are disposed further above the upper valve seat member 11.
[0010]
A disc-shaped condensate discharge valve 8 is held inside the three-way switching valve body 7 so as to maintain a constant position regardless of the rotation of the three-way switching valve body 7. As shown in FIG. 2, an enlarged partial cross-sectional view of the condensate discharge valve 8 includes a thermal expansion / contraction capsule 20 and a drain valve seat 22 penetrating the drain valve port 21. Is fixed to the condensate discharge valve 8 and the capsule 20 is fixed to the upper part of the drain valve seat 22.
[0011]
The thermal expansion / contraction capsule 20 is filled with a temperature-sensitive liquid that expands or contracts according to the ambient temperature through a thin film diaphragm, and the lower end surface 24 of the capsule is discharged from the drain valve seat 22 by this expansion and contraction. The drain valve port 21 is opened or closed by separating and seating the opposite surface. The state shown in FIG. 2 shows a state where the drain valve port 21 is opened.
[0012]
The state shown in FIG. 1 shows a state in which the T-shaped passage 10 communicates with the inlet 2, the regulating valve port 3, and the external communicating passage 16, respectively, and fluid such as steam from the inlet 2 regulates with the three-way switching valve body 7. It flows down from the valve port 3 to the outlet 4 side, and functions as a normal control valve. On the other hand, when condensate having a temperature lower than the steam temperature flows from the inlet 2 side, the thermal expansion / contraction capsule 20 contracts and the discharge valve port 21 opens, so that the condensate is discharged from the condensate. It is discharged from the communication passage 16 to the outside through the valve 8.
[0013]
As the condensate is discharged from the condensate discharge valve 8 and the temperature of the fluid rises, the thermal expansion / contraction capsule 20 gradually expands. When the fluid temperature reaches a predetermined temperature, the capsule lower end surface 24 is moved to the drain valve seat 22. The drainage valve port 21 is closed by sitting on the head, thereby preventing the outflow of steam to the outside.
[0014]
As a temperature-sensitive liquid in the thermal expansion / contraction capsule 20, for example, by filling a liquid that expands when it is 3 degrees, 6 degrees, 10 degrees, or 15 degrees C lower than the saturation temperature of the steam, It is possible to reliably prevent outflow to
[0015]
Only the three-way switching valve body 7 is rotated counterclockwise by 90 degrees from the state shown in FIG. 1, and the condensate discharge valve 8 is maintained as it is, so that the three-way switching between the inlet 2 and the regulating valve port 3 is performed. The condensate discharge valve 8 is completely closed by the valve body 7 and is connected to the inlet 2 by a T-shaped passage 10. Similarly, if the condensate flows down, the condensate discharge valve 8 It is discharged outside.
[0016]
In this embodiment, an example in which the thermal expansion / contraction capsule 20 is used for the condensate discharge valve 8 is shown. However, the condensate discharge valve 8 uses other temperature sensitive members such as bimetal elements and shape memory alloy elements. You can also.
[0017]
【The invention's effect】
A three-way switching valve body arranged between the inlet and the control valve port, which can completely close the fluid flowing down to the control valve port, and condensate flowing in from the inlet to the outside via the condensate discharge valve Can be discharged.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional configuration diagram showing an embodiment of a control valve having a condensate discharging function according to the present invention.
FIG. 2 is an enlarged partial sectional view of a condensate discharge valve used in the present invention.
[Explanation of symbols]
2 Inlet 3 Control valve port 4 Outlet 5 Control valve body 7 Three-way switching valve body 8 Condensate discharge valve 10 T-shaped passage 20 Thermal expansion / contraction capsule 21 Drain valve port 22 Drain valve seat

Claims (1)

A valve casing having an inlet, a control valve port, and an outlet, and a valve body that is slidably attached to the valve casing for controlling the opening and closing of the control valve port. The spherical three-way switching valve body is rotatably arranged, and a substantially T-shaped passage is provided in the three-way switching valve body, and each of the substantially T-shaped passages is provided with an inlet, a regulating valve port, and an external communication passage. communicating, by attaching a substantially disc-shaped condensate water discharge valve inside the three-way valve body, by rotation operation of the three-way valve body, the inlet and adjusting valve port communicated with or shut off the inflow from the inlet A control valve having a condensate discharge function, wherein the condensate to be discharged is discharged from the external communication passage to the outside through the condensate discharge valve.

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