JPH0675012U - Governor with double closing mechanism - Google Patents

Abstract

(57) [Summary] [Purpose] When dust or scale in the fluid gets caught between the first valve body and the first valve seat, resulting in poor closing, the second valve body automatically makes the second valve seat. Is closed to prevent pressure increase of the downstream fluid. [Configuration] A first valve seat 25 and a second valve seat 26 in the valve box 1,
In conjunction with the diaphragm 14, open and close the first valve seat 25,
In addition, the first valve body 30 is provided that adjusts the opening of the first valve seat 25 to adjust the fluid pressure sent to the consumer side. Further, in association with the diaphragm 14 and the first valve body 30, the diaphragm 14 when foreign matter is caught between the first valve body 30 and the first valve seat 25 and the fluid pressure on the downstream side abnormally rises. The second valve body 31 for closing the second valve seat 26 by the action of is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a governor that automatically adjusts the pressure of fluid such as gas pressure supplied to a gas combustion appliance.

[0002]

[Prior art]

 FIG. 3 is a known governor for adjusting the pressure of a fluid such as gas, in which a fluid inlet 2 is provided in the front part of the valve box 1 and a fluid outlet 3 is provided in the rear part thereof, and a diaphragm case 4 is fixed on the valve box 1. A partition 5 for partitioning the inlet 2 and the outlet 3 is provided in the valve box 1, a valve seat 6 is fixed to a screw hole at the center of the partition 5, and a valve body 7 facing the valve seat 6 is connected to a lower end of a valve rod 9. Then, the upper end of the valve rod 9 is connected to the lever 11 in the case 4.

A cover 13 is integrally fixed to the open side of the diaphragm case 4 through a diaphragm 14, and the cover 13 is provided with a vent hole 12 communicating with the atmosphere. A communication hole 15 communicating with the outlet side is provided.

The lever 11 is rotatably mounted in the diaphragm case 4 by a shaft 10, and the front end of the interlocking member 17 connected to the center of the diaphragm 14 is connected to the upper end of the lever 11. The diaphragm 16 and the interlocking member 17 are moved forward and backward together with the diaphragm 14 sandwiched by a seat 16 integrally provided in an intermediate portion of the interlocking member 17 and a spring receiver 19 applied to the cover side of the diaphragm 14.

Further, a male screw on the outer periphery of the adjusting screw 23 is screwed into the female screw inside the cylindrical portion 22 provided on the cover 13, and the adjusting spring 24 is interposed between the adjusting screw 23 and the spring receiver 19. .

In the case of this conventional example, when fluid consumption starts by opening a valve such as a gas combustor communicating with the outlet 3, the fluid entering from the inlet 2 of the valve box 1 passes through the valve seat 6 and is decompressed. Then, it flows from the outlet 3 to a gas combustion appliance.

The fluid pressure reduced by the valve seat 6 enters the diaphragm case 12 through the communication hole 15 and pressurizes the diaphragm 14, but the pressure of the spring 24 and the atmospheric pressure are applied to the cover 13 side of the diaphragm 14. Therefore, the diaphragm 14 maintains a position where the pressures applied to the both sides are balanced and automatically adjusts the opening degree of the valve body 7 to maintain the fluid pressure toward the outlet 3 at a predetermined pressure.

When the consumption of the fluid is stopped, the pressure applied to the front portion of the diaphragm 14 overcomes the atmospheric pressure applied to the rear portion of the diaphragm 14 due to the increase in the fluid pressure on the outlet 3 side, and the lever 11 moves backward. , The valve body 7 is pressed against the valve seat 6 via the valve rod 10 to stop the flow of fluid.

[0009]

[Problems to be solved by the device]

 In the conventional governor as described above, when solid matter such as dust or scale in the fluid is caught between the valve body 7 and the valve seat 6 when the valve body 7 is closed, the closing is not completed and the outlet 3 side Fluid pressure rises.

When the fluid pressure on the outlet side, that is, on the downstream side, rises in this way, there is a risk that fluid will be discharged from the safety valve, or downstream equipment will be damaged.

In order to solve the problems of the conventional governor as described above, an object of the present invention is to provide two valve bodies, and even if foreign matter is caught between one valve body and the valve seat, The goal is to obtain a governor that can prevent fluid leakage by closing the valve seat with the valve body.

[0012]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention provides a first valve seat on the inlet side and a second valve seat on the outlet side in a valve box, and interlocks with the movement of the diaphragm to provide a space between the first valve seat and the first valve seat. A first valve body is provided for adjusting the opening of the valve to adjust the pressure of the fluid flowing to the outlet, and a second valve body for opening and closing the second valve seat from the outlet side is provided between the first valve body and the first valve body. Foreign matter is trapped between the one valve seat and the first valve body, and is compressed by the action of the diaphragm only when the fluid pressure on the outlet side rises to the specified pressure, and the second valve body closes the second valve seat. As described above, a structure in which a spring for pushing the first valve body is interposed is adopted.

[0013]

[Action]

 In a normal operation, the first valve element is operated by the diaphragm to adjust the opening degree between the first valve seat and the first valve element to adjust the fluid to a predetermined pressure. During this time, the space between the second valve seat and the second valve body is always open.

When the consumption of the fluid stops and the fluid pressure on the outlet side rises, the diaphragm moves to the atmosphere side due to this pressure rise, and the first valve body closes the first valve seat.

When the first valve body as described above closes the first valve seat, foreign matter is caught, and if the closing is improper, the fluid leaks and passes through between the second valve seat and the second valve body. Flow into the outlet side and the pressure on the outlet side rises. For this reason, the diaphragm moves further to the atmosphere side, compresses the gap between the first valve body and the second valve body, and the second valve body closes the second valve seat to prevent fluid leakage.

[0016]

【Example】

 1 and 2 show an embodiment of the present invention, in which parts having the same configurations and functions as those of the conventional example of FIG. In the case of this embodiment, valve seats 25 and 26 are provided above and below the partition 5. That is, a male screw on the outer periphery of the upper end of a cylinder 27 having a small diameter first valve seat 25 at the lower end and a large diameter second valve seat 26 at the upper end is screwed into a screw hole provided in the partition 5 and fixed.

Then, a small-diameter first valve body 30 is arranged on the valve seat 25, and a large-diameter second valve body 31 is arranged on the valve seat 26. The second valve body 31 is fixed to the lower end of the valve rod 9 by screwing, and the first valve body 30 is slidable on the small-diameter valve rod 32 which is screwed to the lower end of the second valve body, and O-ring. It is attached by keeping airtightness.

A pressing spring 33 is interposed between the valve bodies 30 and 31, and when the first valve body 30 closes the first valve seat 25 as shown in FIG. It should be separated from the second valve seat 26.

In addition, reference numeral 35 in the figure denotes a cylindrical strainer including a cylindrical body 27 and a wire net provided between the bottom of the valve box 1.

In the case of the above embodiment, in the normally closed state, the first valve body 30 closes the valve seat 25 and the second valve body 31 separates from the valve seat 26 as shown in FIG. 26 is open.

In this state, when the consumption of the fluid starts by opening a valve such as a gas combustor connected to the outlet 3, the fluid entering from the inlet 2 of the valve box 1 passes through the valve seats 25 and 26 and is decompressed. Then, it flows from the outlet 3 to a gas combustion appliance.

The fluid pressure reduced by the valve seat 25 enters the diaphragm case 12 through the communication passage 15 to pressurize the diaphragm 14, but the pressure of the adjusting spring 24 and the atmospheric pressure are applied to the cover 13 side. The diaphragm 14 maintains a position where the pressure applied to both sides is balanced, and automatically adjusts the opening degree of the first valve body 30 to maintain the fluid pressure toward the outlet 3 at a predetermined pressure.

When the consumption of the fluid is stopped, the fluid pressure applied to the front portion of the diaphragm 14 overcomes the atmospheric pressure applied to the rear portion of the diaphragm 14 due to the increase in the fluid pressure on the outlet 3 side, and moves to the rear side. , The valve element 30 is pressed against the valve seat 25 via the valve rods 9 and 32 to stop the flow of fluid.

Now, even though the consumption of the fluid has stopped, the foreign matter a is caught between the first valve body 30 and the first valve seat 25 as shown in FIG. If the fluid flow does not stop, the fluid pressure on the outlet side rises.

Due to this pressure increase, the diaphragm 14 further moves to the atmosphere side, and the valve rod 9 interlocking therewith descends, and the second valve body 31 is pressed against the second valve seat 26 and closed as shown in FIG. To do. At this time, a gap is created between the first valve body 30 and the first valve seat 25 due to the foreign substance a, and a gap is also created between the large-diameter head portion 34 of the valve rod 32 and the first valve body 30.

[0026]

【effect】

 This invention prevents the pressure increase of the downstream fluid by closing the second valve body in place of the first valve body when the first valve body fails to close due to foreign matter being caught as described above. As a result, the risk of pressure increase of the downstream fluid due to improper closing can be greatly reduced, and the fluid can be supplied safely.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of an embodiment.

FIG. 2 is an enlarged vertical front view of the main part of the same as above.

FIG. 3 is a vertical sectional front view of a conventional example.

[Explanation of symbols]

 1 Valve Box 2 Inlet 3 Outlet 14 Diaphragm 25 First Valve Seat 26 Second Valve Seat 30 First Valve Body 31 Second Valve Body 33 Push Spring

Claims (1)

[Scope of utility model registration request] 1. A first valve seat on the inlet side and a second valve seat on the outlet side are provided in a valve box, and the opening degree between the first valve seat and the first valve seat is adjusted in association with the movement of the diaphragm. A first valve body that adjusts the pressure of the fluid flowing to the outlet is provided, and a first valve seat and a first valve are provided between the second valve body that opens and closes the second valve seat from the outlet side and the first valve body. Foreign matter is caught between the bodies, and only when the fluid pressure on the outlet side rises to a predetermined pressure is compressed by the action of the diaphragm and the second valve body closes the second valve seat. Governor with a double opening / closing stop mechanism with a spring that presses.