JPH0953795A - Steam trap with valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steam trap with a valve which can exhaust low pressure air without the necessity of a driving source such as electricity. SOLUTION: A cylindrical directional control valve element 12 is attached between the main body 1 and a cover 2. A passing passage 16 by which an inlet 5 and an outlet 6 are communicated with each other is formed inside the channel switching valve element 12. A coil spring 14 and an auxiliary valve 15 are arranged in the passing passage 16. The auxiliary valve 15 is arranged so as to be separated from an auxiliary valve seat 17 by the elastic force of the coil spring 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steam trap that automatically discharges only condensed water generated by condensation of steam from a steam piping system, and its flow path is the steam trap flow path or bypass flow path. The present invention relates to a combination of flow path switching valves for switching to.

[0002]

2. Description of the Related Art As a steam trap with a valve in which a flow path switching valve is combined, for example, Japanese Patent Publication No. 7-581.
There is one disclosed in Japanese Patent No. 20. This is to provide a heat responsive member at the end of the flow path switching valve body, displace the flow path switching valve body from the valve seat member by the displacement of the heat responsive member, and drive the flow path switching valve body to the valve body. When the low temperature fluid initially flows in, the heat responsive member is displaced to form a gap between the valve body and the valve seat to discharge the low temperature fluid and automatically drive the valve body drive means. A bypass flow path can be formed in the.

[0003]

In the above-mentioned prior art, the problem that the low temperature fluid can be discharged by the heat responsive member but the initial high temperature air cannot be discharged, or the valve driving means is driven. There is a problem that a driving source such as electricity is required.

Therefore, a technical object of the present invention is to provide a steam trap with a valve capable of discharging an initial high temperature air without requiring a driving source such as electricity.

[0005]

Means for Solving the Problems The technical means of the present invention taken to solve the above problems is to form a flow path switching valve and a steam trap by an integrated casing, and In the case where the valve body is slidably arranged with respect to the valve seat member and can be switched as a steam trap flow path or a bypass flow path by operating the flow path switching valve body, the flow path switching valve body has an outlet side. A through passage communicating with the through passage is provided, and an elastic member is elastically biased in the valve opening direction in the through passage to open the valve at an initial low pressure and close when the inside of the casing reaches a predetermined high pressure state. The valve is arranged.

[0006]

[Function] By arranging a sub valve that is biased by an elastic member in the valve opening direction and opened at the initial low pressure in the through passage provided in the flow path switching valve body, not only the initial low temperature air but also the low pressure air -
Can be discharged regardless of temperature. Initial air
When is discharged into a predetermined pressure state, the sub valve is closed against the elastic force of the elastic member, and the discharge of steam can be prevented.

[0007]

EXAMPLES Examples showing specific examples of the above technical means will be described. In FIG. 1, a lid 2 is fastened to a main body 1 with bolts 3 to form a trap casing having a valve chamber 4 inside. An inlet 5 is formed in the upper portion of the main body 1, and an outlet 6 is formed on the same axis as the inlet 5. The inlet 5 communicates with the valve chamber 4 via a cylindrical screen 7. An outlet passage 9 that communicates with the outlet 6 is formed beside the valve chamber 4 with a partition wall 8. A valve seat member 11 having a valve opening 10 is attached to a lower portion of the partition wall 8 to connect the valve chamber 4 and the outlet passage 9 via the valve opening 10.

A flow path switching valve body 12 is attached to the upper part of the main body 1 with a lid 2. The flow path switching valve body 12 has a cylindrical shape, a rotation operation rod 13 is continuously provided in the center, and a through passage 16 for communicating the inlet 5 and the outlet 6 is provided inside the cylindrical shape. A coil spring 14 as an elastic member and a disk-shaped sub valve 15 are arranged in the through passage 16. In the illustrated free state, the coil spring 14 is the sub valve 1.
5 is separated from the sub valve seat 17, and the inlet 5 and the outlet 6 are communicated with each other. A synthetic resin cylindrical valve seat member 18 is arranged on the outer periphery of the flow path switching valve body 12.

A passage 19 is provided in the passage switching valve body 12 orthogonal to the through passage 16. The passage 19 connects the inlet 5 and the outlet 6 when the flow path switching valve body 12 is rotated 90 degrees from the illustrated state.

A hollow spherical float 20 made of a stainless steel thin plate is placed in the valve chamber 4 in a free state. Float 2
0 opens and closes the valve port 10 by ascending and descending according to the level of the condensed water accumulated in the valve chamber 4, and automatically discharges the condensed water accumulated in the valve chamber 4. A substantially U-shaped bimetal 21 is attached to the bottom of the float 20. The bimetal 21 expands as shown in the figure at a low temperature to separate the float 20 from the valve port 10 and contracts at a high temperature to no longer participate in the float 20.

The operation is as follows. The inlet 5 is used by connecting it to a steam using device (not shown). When the initial low-temperature condensate or air flows down from the steam using device into the valve chamber 4, the float 20 opens the valve port 10 by the bimetal 21 and discharges the condensate from the outlet 6. The sub valve 15 in the flow path switching valve body 12 also receives the sub valve seat 1 by the elastic force of the coil spring 14.
It is separated from 7, and discharges the condensate and air flowing down from the outlet 6.

When low-temperature condensate and air are discharged and high-temperature condensate and air flow down, the bimetal 21 contracts and is no longer involved in the float 20, and the float 20 is in the valve chamber. When the condensate accumulated in 4 rises to the prescribed water level, it rises and valve opening 1
Condensate is discharged to the outlet 6 by opening 0.

On the other hand, the flow path switching valve body 12 is open regardless of the temperature, and the high temperature air flowing down is discharged to the outlet 6. When the high temperature air is discharged and the pressure in the valve chamber 4 rises to a predetermined value, the auxiliary valve 15 overcomes the elastic force of the coil spring 14 by this pressure and sits on the auxiliary valve seat 17 to prevent the discharge of steam.

By rotating the flow path switching valve body 12 by 90 degrees by the rotary operation rod 13, the passage 19 can connect the inlet 5 and the outlet 6 regardless of temperature, pressure and amount of condensed water.

[0015]

As described above, according to the present invention, there is provided a steam trap with a valve capable of discharging the initial low-pressure air by the elastic force of the elastic member without requiring a drive source such as electricity. Obtainable.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of a steam trap with valve of the present invention.

[Explanation of symbols]

 1 Main Body 2 Lid 4 Valve Chamber 5 Inlet 6 Outlet 9 Outlet Passage 10 Valve Outlet 12 Flow Path Switching Valve Body 14 Coil Spring 15 Sub-Valve 16 Through Passage 18 Valve Seat Member 20 Hollow Float 21 Bimetal

Claims (1)

[Claims] 1. A flow path switching valve in which a flow path switching valve and a steam trap are integrally formed with a casing, and a valve body of the flow path switching valve is slidably arranged with respect to a valve seat member. In those that can be switched as a steam trap flow path or a bypass flow path by operating the body, a through passage communicating with the outlet side is provided in the flow passage switching valve body, and an elastic member is provided in the through passage to elastically move in the valve opening direction. A steam trap with a valve, characterized in that a sub-valve is arranged which is opened when the initial low pressure is applied and is closed when the inside of the casing reaches a predetermined high pressure state.