JPS5916296B2 - Fluid pressure regulating valve device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention allows the pressure on the downstream side to be maintained at a predetermined value at all times regardless of the location on the upstream side by interposing it in the middle of a fluid supply path such as a gas conduit. , the fluid pressure regulating valve 9 device is configured to always enable fluid supply under safe pressure. A fluid pressure regulating valve device is equipped with a valve that automatically opens and closes in response to fluctuations in the secondary pressure in a side flow path, and is configured so that the secondary pressure is always maintained constant. 5 related.

As this type of fluid pressure regulating valve device, a double-seat valve type as shown in FIG. 1 has been widely used.

This means that when the pressure (hereinafter referred to as secondary pressure) P2 in the downstream flow path 05b decreases, its "0"
An auxiliary pressure regulator 09 (referred to as a pilot governor) acts through a regulating pipe 08 connected to the upstream flow path 0.
5a (hereinafter referred to as primary pressure) P1 is the pipe 010,
011 and into the diaphragm lower chamber 012, the diaphragm 013 is pushed up.
Two upper and lower valves 01 and 0 are connected to this via the valve stem 014.
1' opens and works to increase the flow rate from the upstream side to the downstream side and keep the secondary pressure P2 at a predetermined value. Conversely, if the secondary pressure P2 rises above the predetermined value, j0 The driving pressure in the diaphragm lower chamber 012 is released through the pipes 011 and 08 by the action of the pilot governor 09, and the diaphragm old 3 is pushed down by the elastic force of the spring 015, opening the valves 01 and 0.
1' closes, thereby reducing the flow rate from the upstream side to the downstream side and working to maintain the secondary pressure P2 at a predetermined value. In addition, when fluid use on the downstream side is stopped, valves 01 and 01
' are both pressed against the valve seats 016, 016' of the regulator main body O2, resulting in a so-called shut-off state in which fluid supply is stopped. Such double-seat valve types are widely used, especially as pressure regulating valve devices in large-diameter fluid supply channels.

As shown in the pressure balance state diagram in Fig. 2, the primary pressure P is applied upward to the old valve, and the secondary pressure P2 is applied upward.
is applied downward, and on the other hand, secondary pressure P2 is applied upward to valve 0V, and primary pressure P1 is applied downward, and each valve 01 and 0V cancel each other out, so that the operating load is zero or almost zero. This is because the intended valve operation becomes extremely smooth and an excellent effect on the pressure regulation function is exhibited. According to such a two-seat valve type, as described above, the primary pressure P
Although it has excellent operating characteristics that are not affected by the primary and secondary pressures P2, it has the following drawbacks in terms of shutoff performance.

That is, in the closed state, both valves 01 and 0V must be brought into contact with the valve seats 016 and 016' at the same time and with the same pressing force, but such high-precision assembly and adjustment is technically difficult. Very difficult. In particular, both valves 01 and 0V are set so that they come into close contact with the valve seats 016 and 016' at the time of shut-off.
The stress relaxation of the elastic sealing materials 017 and 017' fitted to the
It is unavoidable that the timing of the contact between the valves 01 and 0V against the valve seats 016 and 016' will be different, and that there will be a difference in the contact force. As a result, the deadline performance can be improved in a short period of time.
There was a drawback that it deteriorated. Therefore, in order to overcome the drawbacks of the double-seat valve type, various single-valve type valves have been considered. The one shown in FIG.
4 is configured in a cylindrical shape having a communication passage 019 for always balancing the same pressure as the secondary pressure P2, and the outer peripheral wall 01a is configured to prevent the primary pressure P1 from leaking into the upper space 04 of the valve 01. A ring packing 018 is fitted into the adjuster main body case 02 so as to be in close contact with the inner circumferential wall surface of the adjuster main body case 02.

However, in this single valve type, the ring seal 0
The frictional resistance caused by 18 is quite large, and this becomes an operating load for the valve, so a large driving force is required for the intended valve operation.
It has poor responsiveness.

In addition to the above, various structures have been developed for this type of single valve type, but all of them have the drawbacks mentioned above, or have problems with shutoff performance, difficulty in adjustment, etc. It had some disadvantages. The present invention
This was done in view of the conventional situation, and the purpose was to adopt a single valve type that does not have the difficulty of adjustment like a double seat valve type, but to reduce the primary pressure that inevitably occurs due to the single valve type. More specifically, we aim to improve shutoff performance by utilizing primary pressure, while ensuring smooth operation performance with less influence from primary pressure during valve operation. It is an object of the present invention to provide a fluid pressure regulating valve device which is easy to adjust to compensate for the shutoff performance against wear and the like, and which is extremely advantageous in terms of handling.

A feature of the fluid pressure regulating valve device according to the present invention, which has been made to achieve the above object, is that in the device having the basic configuration described at the beginning, the valve is connected to an upper space located on the opening direction side and a downstream flow direction. The cylindrical valve has a cylindrical shape having an internal space that can serve as a communication path with the flow path, and the upper space and the downstream flow path 5b are connected to each other in the internal space of the cylindrical valve according to fluctuations in the secondary pressure. an internal valve that automatically opens and closes between a communicating state and a non-communicating state, and the internal valve is configured to be always held in an open position when the valve is opened and closed, and the cylindrical valve An annular gap is provided around the entire circumference between the outer circumferential wall surface of the valve and the inner circumferential wall surface of the main body case, so that the upstream flow path and the upper space are always communicated, and the outer circumferential wall surface of the valve is always connected to the upper space. The main feature lies in that it is configured to be in a non-contact state with the inner circumferential wall surface of the main body case.

The functions and effects exhibited by the above characteristic configuration are as follows.

That is, when the valve is completely closed, the inner valve is in a closed state, so only the upstream flow path and the upper space of the valve communicate through the annular gap between the outer circumferential wall of the valve and the inner circumferential wall of the main body case. As a result, the upper space has the same pressure as the primary pressure, so the primary pressure can be used as the closing force of the valve, so the shutoff performance can be significantly improved. When operating the valve to adjust the desired pressure,
When the inner valve is opened and the upper space of the valve communicates with the downstream flow path, the pressure in the upper space is almost balanced with the secondary pressure, so the load effect due to the primary pressure is eliminated or the can be reduced to

Furthermore, by providing an annular gap along the entire circumference between the outer circumferential wall surface of the valve and the inner circumferential wall surface of the main body case, the outer circumferential wall surface of the valve is always kept in a non-contact state with the inner circumferential wall surface of the main body case. When the valve is operated, there is no frictional resistance between the outer circumferential wall and the inner circumferential wall of the main body case, resulting in extremely smooth operating performance and pressure control with excellent responsiveness. This made it possible to perform adjustment functions. Furthermore, since it basically has a single-valve configuration, it does not require the delicate adjustments that are required for the double-seat valve type mentioned above, making it extremely advantageous in terms of handling. . Hereinafter, one embodiment of the present invention will be described in the fourth embodiment.
This will be explained in detail based on the figure and FIG. In addition, in this explanation, each component surrounded by an imaginary line A in FIG. 1, such as the pilot governor 9, pipes 11, 8, 10, 11, diaphragm 13, and spring 15, is included as a matter of course, so FIG. And these are omitted in FIG. For example, a flow path 5 on the downstream side of the fluid supply path 5 such as a gas conduit is installed inside the main body case 2 interposed in the middle of the fluid supply path 5.
diaphragm 1 that responds to fluctuations in the secondary pressure P2 in b
A valve 1 that automatically opens and closes by moving up and down with respect to the main body case 2 via a valve stem 14 connected to The internal space 1b of the cylindrical valve 1 is configured to have a cylindrical shape having an internal space 1b that can serve as a communication path with the cylindrical valve 1.
In b, there is an automatic opening/closing operation for the communication hole 19 so as to switch between communicating and not communicating the upper space 4 and the downstream flow path 5b according to fluctuations in the secondary pressure P2. An inner valve 6 is installed inside, and the inner valve 6 is urged upward by a compression spring 7 so that it is always held in an open position when the valve 1 is opened or closed, and the outer periphery of the cylindrical valve 1 is biased upwardly by a compression spring 7. An annular gap 3 is provided around the entire circumference between the wall surface and the inner circumferential wall surface of the main body case 2, and the upstream flow path 5a
and the upper space 4 are always communicated, and the valve 1
The outer circumferential wall surface of the main body case 2 is configured to be in a non-contact state with the inner circumferential wall surface of the main body case 2 at all times.

In the fluid pressure regulating valve device having the above configuration, the valve 1
When the is open, most of the fluid flows from the upstream side through the valve 1 to the downstream side, but some fluid flows from the annular gap 3 into the valve upper space 4 and then flows into the internal space 1b of the valve 1 and the communication Since it flows downstream through the hole 19, the valve upper space 4
is maintained at approximately the same pressure as the secondary pressure P2. Therefore, no uneven forces are applied to the valve 1. When the secondary pressure P2 rises above the specified value, the valve 1 operates in the closing direction, but the reason why the valve 1 closes is because the valve 1 first contacts the valve seat 16, as shown in FIG. Most of the fluid flow is cut off, and as the secondary pressure P2 increases, the spring 7
The inner valve 6 overcomes this and closes, becoming completely closed.
Then, the pressure in the upper space 4 gradually increases to a pressure equal to the primary pressure P1, which acts as a force to close the valve 1, so that the shutoff performance is significantly improved. Next, when the secondary pressure P2 falls, the valve rod 14 connected to the diaphragm 13 rises, first opening the inner valve 6. At this time, the primary pressure P is applied to the inner valve 6 somewhat unevenly, but since the area is extremely small, the uneven force is small and does not affect the valve operating state. When the inner valve 6 opens, the pressure in the upper space 4 flows downstream through the inner space 1b of the valve 1 and the communication hole 19, and becomes almost equal to the secondary pressure, so that the pressure imbalance in the valve 1 disappears. The operation becomes smooth.

[Brief explanation of drawings]

Figure 1 is a sectional view showing a conventional double-seat pressure regulating valve device;
FIG. 2 is a state diagram of the pressure balance of the one shown in FIG. 1, and FIG. 3 is a sectional view of the main part showing the cylinder type single valve type pressure regulating valve device. FIGS. 4 and 5 show an embodiment of the fluid pressure regulating valve device according to the present invention, and each is a sectional view of a main part for explaining the operating state. 1...Valve, 1b...
...Internal space, 2...Main case, 3...
... Annular gap, 4 ... Upper space, 5 ...
...Fluid supply path, 5a...Upstream flow path, 5b...
...Downstream flow path, P1...Primary side pressure, P
2...Secondary side pressure, 6...Inner valve.

Claims (1)

[Claims] 1. A valve 1 that automatically opens and closes in response to fluctuations in the secondary pressure P_2 in the downstream flow path 5b is installed inside the main body case 2 interposed in the middle of the fluid supply path 5, and In a fluid pressure regulating valve device configured such that the secondary side pressure P_2 is always kept constant, the valve 1 is connected to the upper space 4 located on the opening direction side and the downstream flow path 5b. The cylindrical valve 1 is configured to have a cylindrical shape having an internal space 1b that can serve as a passage, and in the internal space 1b of the cylindrical valve 1, the upper space 4 and the downstream flow path 5b are arranged according to fluctuations in the secondary side pressure P_2. an internal valve 6 that automatically opens and closes between a communicating state and a non-communicating state, and the internal valve 6 is configured to be always held in an open position when the valve 1 is opened and closed, and further, An annular gap 3 is provided around the entire circumference between the outer circumferential wall surface of the cylindrical valve 1 and the inner circumferential wall surface of the main body case 2, and the upstream flow path 5a and the upper space 4 are
A fluid pressure regulating valve device characterized in that the valve 1 is always in communication with the valve 1 and the outer peripheral wall surface of the valve 1 is always in a non-contact state with the inner peripheral wall surface of the main body case 2.