JPH0354365B2 - - Google Patents

Description

Detailed Description of the Invention The present invention mainly relates to changes in end pressure (secondary pressure) and supply pressure (primary pressure) in underground pipes such as city gas supply pipes and water pipes, plant pipes, etc. This invention relates to a pressure regulator used to maintain secondary pressure at a set pressure regardless of load fluctuations.

Among such pressure regulators, there have been conventionally mainstream ones, such as a Fischer type pressure regulator and a Reynold type pressure regulator.

The fishier pressure regulator has a structure as shown in Fig. 2A, with the secondary pressure (indicated by dots) as the pilot pressure, and the loading pressure (shown by the dots) applied to the main diaphragm 3' linked to the main valve 1'. The pilot governor 7' is provided with a pilot governor 7' that changes the pressure (shaded area).The operating principle is as follows: When the secondary pressure decreases, the pressure above the pilot governor 7' also decreases, and the biasing force of the spring 20' increases. As a result, the pair of upper and lower pilot diaphragms 21' are displaced upwardly, and the sub-valve 17' opens.
Exhaust valve 1 opens and closes contrary to that.
6' is closed, and the primary pressure (the part shown by the grid) is guided to the lower part of the main diaphragm 3' through the sub-valve 17' as loading pressure, and the main valve 1' is activated against the biasing force of the spring 5'. The fluid is pushed upward to flow from the primary side to the secondary side, raising the secondary pressure to the set pressure. Conversely, if the secondary pressure rises above the set pressure due to lack of fluid demand, the pilot diaphragm 2
1' is pushed down and subvalve 1
7' is closed, the exhaust valve 16' is opened, and the pressure under the main diaphragm 3' escapes to the secondary side, and the main valve 1' is closed by the biasing force of the spring 5', allowing the fluid to flow to the secondary side. The secondary pressure is lowered by cutting off the flow of the air, and the secondary pressure is automatically maintained at the set pressure.

However, with this fixer pressure regulator, if the primary pressure drops below the specified pressure (minimum operating pressure) due to damage to the supply pipe on the primary side or leakage of internal fluid during repair and inspection, etc. If it is necessary to lower the loading pressure, the loading pressure will drop below the set pressure as the primary pressure decreases, and the main valve 1' will close due to the biasing force of the spring 5', making it impossible to regulate the pressure. It was hot.

On the other hand, the Reynolds type pressure regulator has a structure as shown in FIG. ), and a low pressure auxiliary governor 25' that releases and lowers the intermediate pressure to the secondary side.
When the secondary pressure (indicated by dots) decreases, the low pressure auxiliary governor works to increase the
The intermediate pressure inside the weight escapes to the secondary side and decreases, causing weight 2
6', 26' causes the main valve 1' to open via the link mechanism 27', increasing the secondary pressure to the set pressure, and conversely, when the secondary pressure rises above the set pressure, the low pressure The auxiliary governor 25' blocks the intermediate pressure from escaping to the secondary side, and by the action of the intermediate pressure auxiliary governor 24', part of the primary pressure (the portion shown by the grid) is transferred to the oxy-jar ball 22' side as intermediate pressure. The main valve 1' is closed by pushing up the diaphragm 23' of the auxiliary ball 22', thereby reducing the secondary pressure to the set pressure. In the event of a low pressure emergency, the medium pressure stop valve 28' and the low pressure stop valve 2
9' is closed, and the opening and closing of the main valve 1' is controlled by the balance between the force in the direction of closing the main valve 1' through the main diaphragm 3' due to the secondary pressure and the force in the direction of opening the main valve due to the weights 26' and 26'. It is possible to switch to a direct-acting pressure regulator that regulates the secondary pressure, and even if the pressure regulation performance deteriorates to some extent, it will not become impossible to regulate the pressure.

However, in this Reynold pressure regulator, there are many devices to be attached, such as the oxy-jari ball 22', the low-pressure auxiliary governor 25', and the medium-pressure auxiliary governor 24', which tend to increase the size.Moreover, the vibration of each of the attached devices during an earthquake In order to prevent destruction, each of the attached devices must be fixed, but because there are many fixing elements and they are scattered, fixing them is not sufficient to improve seismic resistance. In the case of underground pipes, the pit is relatively narrow.
Assembling and fixing work within P′ was required, which was also disadvantageous in terms of construction. Furthermore, if the device is submerged in water in the pit P' due to water damage such as a typhoon, water may enter the chamber 6a above the main diaphragm 3', the auxiliary ball 22', or the low pressure auxiliary governor 25', and the weight of the water may cause This causes the diaphragm to be pushed down, opening the main valve 1' and causing the secondary pressure to rise rapidly, which is a very dangerous situation.Also, since a large number of diaphragms are used, there is a possibility that the diaphragm may be damaged. The possibility of fluid leakage also increased, resulting in a lack of safety.

The purpose of the present invention is to take advantage of the above-mentioned advantages of the above-mentioned Fishery pressure regulator, which is smaller, simpler, and less prone to trouble than the above-mentioned Reynold pressure regulator, while also improving the The object of the present invention is to provide a pressure regulator of an extremely high performance and of a new type never seen before, which can eliminate the inability to adjust the next pressure.

The characteristic configuration of the present invention is that the fluid supply pipe is provided with a main valve for adjusting the pressure on the secondary side, and the actuator for the main valve includes a diaphragm for opening the main valve, and a diaphragm for closing the main valve. A spring is provided for applying pressure on the primary side to the valve opening pressure chamber with respect to the diaphragm when the pressure on the secondary side is decreased, and applying pressure in the pressure chamber for opening the valve when the pressure on the secondary side is increasing. A pilot governor is provided so as to automatically switch in response to changes in the pilot pressure from the secondary side by the pilot pipe, and the opening of the main valve is adjusted to control the pressure on the secondary side. The pressure regulator is configured such that the actuator section is configured to automatically maintain the pressure at a set pressure, wherein an on-off valve is provided in a communication pipe connecting the pilot governor and the valve opening pressure chamber, and the opening/closing valve is provided with respect to the diaphragm. A communication pipe for applying secondary side pressure to a valve-closing pressure chamber formed on the opposite side of the valve pressure chamber, and an on-off valve for opening and closing the communication pipe, and an auxiliary spring for opening the main valve. and an operating mechanism for switching between a steady state in which the spring closes and biases the main valve and an emergency state in which the auxiliary spring opens and biases the main valve,
Its effects are as follows.

In other words, the pressure regulating function of the pressure regulator described above will be explained as follows with reference to FIG.

(a) In a steady state where the primary pressure is high, the operating mechanism 9
When the spring 5 closes and biases the main valve 1 to a steady state, and at the same time opens the on-off valve 19 and closes the on-off valve 10, if the secondary pressure rises, the pilot governor 7
The increase in the driving pressure from the pilot governor increases the pressure applied to the diaphragm 3 and reduces the opening of the main valve 1. Conversely, if the secondary pressure decreases, the driving pressure from the pilot governor 7 decreases, causing the main valve to open. By increasing the opening degree of No. 1, the secondary pressure can be maintained constant.

(b) In an emergency state where the primary pressure is low, when the auxiliary spring 12 opens and biases the main valve 1 and sets the emergency state, closes the on-off valve 16 and opens the on-off valve 10, the diaphragm 3 Secondary pressure from the on-off valve 10 is introduced into the valve-closing pressure chamber 6b, and the valve-closing force due to the secondary pressure acting on the diaphragm 3 and the auxiliary spring 12 are
The opening degree of the main valve 1 can be adjusted by balancing the opening force with the valve opening force, and the secondary pressure can be maintained constant.

In short, like the above-mentioned Reynold pressure regulator, it has an excellent pressure regulating function that can maintain a constant secondary pressure regardless of large fluctuations in the primary pressure, and it also has a governor to operate the main valve 1. Since there is only one sealed pilot governor 7, it is smaller and simpler than the Reynolds type pressure regulator and less likely to cause trouble, and has the advantages of the Fisher type pressure regulator described above.

As a result, it is small, simple, and trouble-free.
Moreover, it has become possible to provide a pressure regulator with overall higher performance, which exhibits the secondary pressure adjustment function regardless of wide fluctuations in the primary pressure.

Next, embodiments of the configuration of the present invention will be described based on the drawings.

As shown in Figure 1, it is installed in a city gas supply pipe A buried underground, and when the city gas supplied at high pressure is distributed from the primary side a to the secondary side b, the flow rate is controlled. To configure a pressure regulator that controls and reduces the pressure on the secondary side to positive pressure, a cylindrical part with an irregular cross-sectional shape is attached to the top of an actuator part 4, which is made up of a diaphragm 3 fixed to a stem 2 directly connected to the main valve 1. Part 1
3, a compression spring 5 is provided in the cylindrical member 13, and the biasing force of the spring 5 is transmitted to the stem 2 via the spring seat 14 to bias the main valve 1 in the closing direction. In addition, a pilot governor 7 is provided which applies the primary pressure (portion shown by the grid) as loading pressure (portion shown by dots) to the chamber 6a above the diaphragm 3 in the actuator section 4 through the driving pressure supply pipe 8. At the same time, pilot pressure is supplied to the pilot governor 7 from the secondary pressure (shaded area) side through the pilot pipe 15, and when the secondary pressure rises above a predetermined pressure, the pilot governor 7
A pair of upper and lower diaphragms 21 inside are pushed down as the pilot pressure increases, and the exhaust valve 16 built in the pilot governor 7 is opened.
opens, the sub-valve 17 closes, and the pressure in the upper chamber 6a increases to the exhaust valve 16.
The main valve 1 is closed by the biasing force of the spring 5, lowering the secondary pressure to a predetermined pressure, and conversely, if the secondary pressure falls below the predetermined pressure, the pilot pressure decreases. The diaphragm 3 is pushed up by the biasing force of the spring 20, the exhaust valve 16 is closed, and the sub-valve 17 is opened, and the primary pressure is applied to the upper chamber 6a as loading pressure through the sub-valve 17. The main valve 1 is opened by pushing down the diaphragm 3 against the biasing force of the spring 5, and the secondary pressure is increased to a predetermined pressure.

In addition, in an emergency where the primary pressure temporarily decreases due to breakage of the supply pipe on the primary side or unexpected leakage of supply gas during repair inspection, etc., it is necessary to screw the pipe into the helical shaft 18 formed on the stem 2. The spring seat 14, which is located at The auxiliary spring 12 is brought into pressure contact with the auxiliary spring 12, and the biasing force of the auxiliary spring 12 biases the main valve 1 in the opening direction via the spring seat 14. An on-off valve 10 which is closed in the normal state of the valved supply pipe 11 which closes the valve 19 and introduces secondary pressure into the chamber 6b below the diaphragm 3 in the actuator section 4
is opened and switched to a direct-acting pressure regulator that controls opening and closing of the main valve 1 by balancing the push-up force of the diaphragm 3 due to the secondary pressure and the push-down force of the auxiliary spring 12.

It goes without saying that the biasing force of the auxiliary spring 12 can be changed by adjusting the rotation of the operating mechanism 9.

Further, the main valve 1 may be configured to be opened by pushing up. In that case, the driving pressure supply pipe 8 is connected to the chamber 6b below the diaphragm 3, and the valved supply pipe 8 is connected to the chamber 6b below the diaphragm 3. tube 11
is connected to the upper chamber 6a, and the auxiliary spring 12 is used in normal times, and the spring 5 is used in emergencies.

[Brief explanation of drawings]

The drawings show an embodiment of a voltage regulator according to the present invention, in which FIG. 1 is a vertical cross-sectional view of a main part, and FIGS. 2A and 2B are vertical cross-sectional views showing a conventional example, respectively. DESCRIPTION OF SYMBOLS 1... Main valve, 2... Stem, 3... Diaphragm, 4... Actuator part, 6a... One chamber,
6b...other chamber, 7...pilot governor, 8...driving pressure supply pipe, 9...operation mechanism, 10...valve, 11...supply pipe, 12...auxiliary spring.

Claims (1)

[Claims] 1. A main valve 1 for adjusting the pressure on the secondary side b is provided in the fluid supply pipe A, and the main valve 1
A diaphragm 3 for opening the main valve 1 and a spring 5 for closing the main valve 1 are provided in the actuator section 4 for the diaphragm 3 to reduce the pressure on the primary side a when the pressure on the secondary side b is reduced. The pilot pressure from the secondary side b by the pilot pipe 15 is applied to the valve opening pressure chamber 6a against the pressure of the valve opening chamber 6a, and the pressure of the valve opening pressure chamber 6a is released when the pressure on the secondary side b increases. One pilot governor 7 is provided so as to automatically switch in accordance with the change in pressure, and the actuator section is configured to automatically maintain the pressure on the secondary side b at a set pressure by adjusting the opening degree of the main valve 1. 4, the pilot governor 7 and the valve opening pressure chamber 6.
An on-off valve 19 is provided in the communication pipe 8 connecting the diaphragm 3, and pressure on the secondary side b is applied to the valve-closing pressure chamber 6b formed on the opposite side of the valve-opening pressure chamber 6a with respect to the diaphragm 3. A communication pipe 11 and an on-off valve 10 for opening and closing the communication pipe 11 are provided, an auxiliary spring 12 is provided for opening the main valve 1, and the spring 5 is connected to the main valve 1.
steady state in which the main valve 1 is closed and energized;
The pressure regulator is provided with an operating mechanism 9 for switching to an emergency state in which the auxiliary spring 12 opens and biases the pressure regulator.