JPH0217751B2 - - Google Patents

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a governor side flow path for connecting to a low-pressure auxiliary governor of a Reynold type governor, and a conduit downstream of a main valve of the Reynold type governor. A remote control pipe side flow path for connecting to a remote position with respect to the main valve, and a directly connected regulation pipe side flow path for connecting to a position near the main valve among the conduits downstream of the main valve. A first on-off valve body is provided between the governor-side flow path and the remote adjustment pipe-side flow path, and a second on-off valve body is provided between the governor-side flow path and the directly connected adjustment pipe-side flow path. , a diaphragm that operates in response to pressure fluctuations in the remote control tube side flow path is connected to the first and second on-off valve bodies, and when the pressure in the remote control tube side flow path is below a set value, the first on-off valve is activated. When the body is closed and the second on-off valve body is opened, and the pressure in the remote control pipe side flow path exceeds a set value, the first on-off valve body is opened and the second on-off valve body is opened. This invention relates to a safety device for a Reynold type governor that is linked so that it can be closed.

The usage pattern of the above-mentioned safety device is as shown in FIG.

In other words, in the Reynolds type governor, the main diaphragm 22 is linked to the main valve 21 that adjusts the secondary pressure, and the pressure guide path 24 that mainly leads the secondary pressure to the diaphragm chamber 23 is linked to the main diaphragm 22. The weight 26 and the assisting ball disk 27 are applied to the swinging lever 25, and the downstream portion 29 and the assisting ball disk 27 are applied to the upstream portion 28 of the main valve 21 of the conduit.
A medium pressure auxiliary governor 31,
A needle valve 32 and a low pressure auxiliary governor 33 are provided.

In short, the Reynolds type governor operates the main valve 21 normally over a wide range of changes in flow rate, so the intermediate pressure auxiliary governor 31 and the low pressure auxiliary governor 3
3 is attached, thereby amplifying minute changes in pressure in the downstream portion 29 and making them act on the main valve 21.

That is, a part of the gas in the upstream portion 28 is guided to the intermediate pressure auxiliary governor 31 to adjust the intermediate static pressure,
Gas from the intermediate pressure auxiliary governor 31 is guided to the auxiliary ball disk 27 with its flow rate restricted by the needle valve 32, and is made to act on the main valve 21. Further, the intermediate static pressure is adjusted by the low pressure auxiliary governor 33 so that the pressure in the downstream part 29 and the weight 26 are balanced, and the pressure balanced with the weight 26 becomes the set pressure.

To explain further, when there is no demand for gas, the main valve 21, medium pressure auxiliary governor 31, and low pressure auxiliary governor 33 are closed, and when there is demand for gas,
The pressure in the downstream section 29 decreases and the equilibrium is broken in the low pressure auxiliary governor 33, causing the diaphragm to drop and the valve to open, allowing gas to flow to the downstream section 29. As a result, the pressure in the auxiliary sphere 27 whose flow rate is restricted by the needle valve 32 decreases and the diaphragm goes down, so the swing lever 25 goes down and the main valve 21 opens, working to meet the demand. As the demand becomes more and more, the valve of the low pressure auxiliary governor 33 opens accordingly, and as the intermediate static force decreases, the main valve 21 opens further to provide pressure support for the downstream part 29. On the other hand, when the demand decreases, the Reynold governor works in the opposite way to the above case, and when the demand disappears, it closes completely as before, closing all the flow paths. In this way, pressure regulation is performed to always maintain the required pressure in the downstream portion 29 regardless of fluctuations in the pressure in the upstream portion 28 in response to changes in demand.

The safety device 34 is connected to the low pressure auxiliary governor 33 through the governor side portion A', and to the conduit downstream portion 29 through the remote adjustment pipe section B' and the direct adjustment pipe section C'. , a remote adjustment part B connected to a remote position (a distance approximately 2 to 5 times the diameter of the conduit) with respect to the main valve 21 so as to prevent pressure fluctuations caused by flow disturbances caused by the main valve 21. ′ is communicated with the low pressure auxiliary governor 33, and when the remote control portion B′ is damaged, only the directly connected adjustment pipe portion C′ connected to the main valve 21 at a position close to the main valve 21 is communicated with the low pressure auxiliary governor 33. The flow path is automatically switched to suppress fluid leakage from the remote control portion B' and to continue adjusting the secondary pressure.

[Conventional technology]

Conventionally, to form the above-mentioned safety device, as shown in FIG.
The first on-off valve body 4 is placed beside the remote control pipe side flow path B' with respect to the valve seat 2' between B', and the governor side flow path
With respect to the valve seat 3' between A' and the direct connection adjustment pipe section C', a second opening/closing valve body 5' is arranged beside the direct connection adjustment pipe section C',
A diaphragm 1' which is interlocked with the first and second opening/closing valve bodies 4' and 5' and which is equipped with a weight 12' faces a remote control pipe side flow path B' which also serves as the diaphragm chamber S.

In other words, normally, the diaphragm 1' is pushed up due to the high pressure in the remote control tube side flow path B'.
When the first on-off valve body 4' is opened and the second on-off valve body 5' is closed, and the remote control pipe is damaged, the pressure in the remote control pipe side flow path B' decreases, and the weight 1
2' pushes down the diaphragm 1', the first on-off valve body 4' is closed, and the second on-off valve body 5' is opened.

[Problem to be solved by the invention]

However, there is a drawback that when the remote control tube is damaged, the flow path switching operation tends to become unstable or impossible.

In other words, when the pressure in the remote control pipe side flow path B' suddenly decreases, the pressure drop is transmitted to the governor side flow path A' before the flow path is switched, and the opening degree of the low pressure auxiliary governor increases, causing the secondary The pressure increases and the increased secondary pressure is transmitted to the direct-coupled regulating pipe section C', so the direct-coupling regulating pipe flow path
The high pressure of C' is transmitted to the diaphragm chamber S', and the flow path switching by the weight 12' is delayed, or the diaphragm 1', which has been lowered, is pushed up and the flow path switching becomes impossible, or the flow path switching becomes impossible. There may be no movement at all.

An object of the present invention is to enable rapid and reliable flow path switching even if the pressure drop in the remote control tube side flow path is rapid.

[Means to solve the problem]

The characteristic configuration of the present invention is that the first on-off valve body between the governor side flow path and the remote control pipe side flow path is arranged closer to the governor side flow path than the valve seat therefor, and is directly connected to the governor side flow path. A second opening/closing valve element between the flow passages on the regulating pipe side is arranged closer to the flow passage on the governor side than a valve seat therefor, and the first and second valve bodies are arranged in a diaphragm chamber separated from the three said flow passages. A diaphragm interlocked with the second on-off valve body is provided, and the remote control pipe side flow path is connected to the diaphragm chamber through a communicating path, and its effects are as follows.

[Effect]

Normally, as illustrated in FIG. 1, the pressure in the remote control pipe side flow path B that exceeds the set value is transmitted to the diaphragm chamber S through the communication path 7, and the diaphragm 1 is pushed up, causing the first on-off valve to The body 4 is opened apart from the valve seat 2 to the governor side flow path A, and the second
The opening/closing valve body 5 is pressed against the valve seat 3 so that the governor side flow path A is closed. That is, as described in detail above with reference to FIG. 4, the pressure from the remote control pipe side flow path B operates the low pressure auxiliary governor 33, and the secondary pressure is adjusted.

When the pressure in the remote control pipe side flow path B decreases, the diaphragm 1 is pushed down by the weight 12, etc., and the first opening/closing valve body 4 is pressed down against the valve seat 2, as illustrated in FIG.
When the governor side flow path is pushed and closed, the second opening/closing valve body 5 is moved from the valve seat 3 to the governor side flow path A.
It is opened at a distance. That is, as described above in detail with reference to FIG. 4, the pressure from the direct-coupled regulating pipe side flow path C operates the low-pressure auxiliary governor 33, and the secondary pressure is adjusted.

In the condition shown in Figure 1, the pressure in the remote control pipe side flow path B suddenly drops, and this pressure drop increases the opening degree of the main valve of the Reynolds type governor, and the secondary pressure rises, causing the direct control pipe side flow path. Even if the pressure of C increases,
The high pressure in the directly connected adjustment pipe side flow path C is the second on-off valve body 5.
It is easy to design the communication passage 7 so that the pressure transmission to the diaphragm chamber S is delayed to a necessary and sufficient degree, and therefore it is easy to design the communication passage 7 so that the pressure transmission to the diaphragm chamber S is delayed to a necessary and sufficient degree. Adjustment tube side flow path C
flow path switching is not inhibited by the high pressure of
Channel switching can be achieved quickly and reliably.

〔Effect of the invention〕

As a result, in remote control pipes that are often buried in places where they are easily damaged, such as public roads, even if a sudden pressure drop occurs due to damage, the first on-off valve body can be quickly and reliably closed, and the second on-off valve body can be opened. Therefore, it has become possible to provide an extremely high-performance safety device for a pressure regulating governor that can suppress fluid leakage and regulate secondary pressure in a good and reliable manner.

〔Example〕

Next, an example will be shown with reference to FIGS. 1, 2, and 4.

A governor side flow path A', a remote adjustment tube side flow path B, and a direct adjustment tube side flow path C are formed in the case body 9, and the governor side flow path A is connected to the low pressure auxiliary governor 33 of the Reynold type governor. A remote control pipe side flow path B is connected to a remote position from the main valve 21 among the conduits downstream of the main valve 21 of the type governor, and a remote control pipe side flow path B is connected to a position close to the main valve 21 among the conduits downstream from the main valve 21. It is configured such that a direct adjustment tube side flow path C is connected to the position.

A first on-off valve body 4 is provided between the governor side flow path A and the remote control tube side flow path B, and is arranged closer to the governor side flow path A than the valve seat 2 thereto.

A second on-off valve body 5 is provided between the governor-side flow path A and the direct-coupled regulating pipe-side flow path C, and is disposed closer to the governor-side flow path A than the valve seat 3 for it.

A spindle B, to which the first and second on-off valve bodies 4 and 5 are attached, passes through the partition wall 11 so as to be able to slide up and down, and the penetrating portion is sealed with a seal 13.

A sliding guide 14 slidably fitted to the valve seat 2
is attached to the first on-off valve body 4, and a sliding guide 15 which is slidably fitted onto the valve seat 3 is attached to the second on-off valve body 5.

The diaphragm 1 is clamped and fixed between the case body 9 and the lid 10, and a diaphragm chamber S is formed between the diaphragm 1 and the partition wall 11, and the three channels A,
B and C are formed in a divided state.

A communication path 7 connecting the remote control tube side flow path B and the diaphragm chamber S is formed in the spindle 8, and configured so that the pressure from the remote control tube side flow path B pushes up the diaphragm 1. A weight 12 is attached to push it down. Note that a spring may be provided in place of the weight 12.

In other words, the diaphragm 1 is operated up and down in response to pressure fluctuations in the flow path B on the remote control pipe side, and the operation of the diaphragm 1 operates the first and second on-off valve bodies 4 and 5, resulting in the state in item (a) below. The configuration is such that flow path switching is automatically executed from the state described in (b) below.

(b) In normal times when the pressure in the remote control pipe side flow path B exceeds the set value, as shown in FIG. 1, the first on-off valve body 4 is opened and the second on-off valve body 5 is closed. It is being

(b) When the pressure in the remote control pipe side flow path B is abnormal and is below the set value, the first on-off valve body 4 is closed and the second on-off valve body 5 is opened, as shown in FIG. It's dark.

In short, when the secondary pressure is being transmitted to the low-pressure auxiliary governor 33 through the remote control pipe side flow path B, the state of item (a) above is maintained, and the main valve 21 is not affected by the flow disturbance caused by the main valve 21. As shown in FIG. 4, the secondary pressure can be adjusted with high accuracy as detailed above.

In the unlikely event that the remote control pipe is damaged, the state is automatically switched to the state in item (b) above, and fluid leakage from the remote control pipe is suppressed, and the direct connection pipe side flow path C connects the low pressure auxiliary governor 33. The secondary pressure is transmitted to maintain the secondary pressure regulation function as detailed above with reference to FIG.

In addition, at the time of the above switching, the direct connection adjustment pipe side flow path C
Even if the pressure becomes high, it is possible to sufficiently suppress the high pressure from acting on the second on-off valve 5 in the switching direction and the high pressure acting on the diaphragm 1 due to the delay in pressure transmission through the communication passage 7, thereby preventing the flow passage switching. This can be achieved quickly and reliably.

[Brief explanation of drawings]

FIGS. 1 and 2 are cross-sectional views showing embodiments of the present invention. FIG. 3 is a sectional view of a conventional example. Fourth
The figure is a conceptual diagram showing how a safety device is used in a Reynold type governor. A...Governor side flow path, B...Remote adjustment pipe side flow path, C...Direct adjustment pipe side flow path, S...Diaphragm chamber, 1...Diaphragm, 2, 3...Valve seat, 4
...First on-off valve body, 5... Second on-off valve body, 7...
Communication path, 8...spindle.

Claims (1)

[Scope of Claims] 1. A governor side flow path A for connecting to the low-pressure auxiliary governor 33 of the Reynold type governor, a remote position with respect to the main valve 21 of the conduit downstream of the main valve 21 of the Reynold type governor. a remote adjustment pipe side flow path B for connecting to the main valve 21, and a direct adjustment pipe side flow path C for connecting to a position near the main valve 21 among the conduits downstream from the main valve 21, The governor side flow path A and the remote control tube side flow path B
A first on-off valve body 4 is provided between the governor side flow path A and the directly connected adjustment pipe side flow path C, and a second on-off valve body 5 is provided between the governor side flow path A and the directly connected adjustment pipe side flow path C, and pressure fluctuations in the remote adjustment pipe side flow path B are provided. The diaphragm 1, which operates in accordance with When the second on-off valve body 5 is opened and the pressure in the remote control pipe side flow path B exceeds a set value,
This is a safety device for a Reynold type governor that is interlocked so that the first on-off valve body 4 is opened and the second on-off valve body 5 is closed, and the first on-off valve body 4 is connected to the valve seat 2 relative to the first on-off valve body 4. The second opening/closing valve element 5 is arranged closer to the governor side flow path A than the valve seat 3 thereto, and the three flow paths A, B, C is a safety device for a Reynold type governor in which the diaphragm 1 is installed in a diaphragm chamber S which is divided into sections, and the remote control tube side flow path B is connected to the diaphragm chamber S by a communication path 7. 2. The safety device for a Reynold type governor according to claim 1, wherein the communication passage 7 is formed in a spindle 8 for connecting the diaphragm 1 to the first and second on-off valve bodies 4 and 5. .