JPS594326Y2 - automatic control pressure reducing valve - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an automatically controlled pressure reducing valve that supplies compressed gas such as oxygen or nitrogen to the secondary side as a predetermined low pressure gas.

As shown in Fig. 1, a conventional pressure reducing valve has a filter main body A.
The compressed gas sent into the pressure reducing valve body B from the side passes through the circumferential groove of the valve case C to the valve spring chamber D and the high pressure spring (E).
The gas is sent to a pilot pressure reducing valve (not shown) through a passage F and a foot screw G, and the pressure is reduced to a predetermined pressure by the pilot pressure reducing valve. The valve material Q that had been pressed against the valve seat P of the valve seat N by the valve pusher M
is pushed together with the valve case C to reduce the pressure of the compressed gas in the pressure reducing valve main body B from between the valve seat P and the valve material Q. It is designed to send out to the outlet joint S side, but when reducing the pressure to 1/10 to 20, the valve seat P and valve material Q
The gas flow flowing from inside the valve seat (N) to the moving vehicle R side of the diaphragm H increases significantly and becomes supersonic,
As a result, a shock wave is generated and a pressure unevenness occurs, and the pressure unevenness changes in magnitude from the static pressure on the back chamber side of the diaphragm H, so the diaphragm H vibrates, and this vibration causes the valve pusher M to destroy the valve material Q. It was causing this.

Therefore, this invention was devised in view of the above drawbacks.
To provide an automatically controlled pressure reducing valve that can withstand long-term continuous use by absorbing the above-mentioned shock waves with a plurality of valve membranes to eliminate the occurrence of vibration, and by eliminating the repeated hitting of the valve material by pressing the valve to prevent damage to the valve material. be.

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

A valve case 3 is movably provided in a passage 2 communicating with the gas cylinder side of the pressure reducing valve body 1, and a valve material 4 of the valve case 3 is provided.
A valve seat 6 having a valve seat 5 facing the main body 1
One end of the valve pusher 7 installed inside the valve seat 6 is made to face the valve material 4 and the other end is made to face the diaphragm 8, and the back chamber 9 of the diaphragm 8 is connected to the passage 2 and the pilot pressure reduction. In the pressure reducing valve communicated via the mechanism 10, the diaphragm 8 is connected to a plurality of valve membranes 81.
．． 82, a disc 83 and an annular plate 84 made of metal or other hard material and opened in the valve membranes 81.82, and a gap 85 between the drawing plates 83, 84 and the outside of the annular plate 84. It is composed of a hole 86.

A strainer body 11 communicating with the gas cylinder side is screwed onto the pressure reducing valve body 1, and an inlet joint 14 is screwed into the strainer body 11 via a filter 12 and a spring 13.

The passage 2 communicating with the strainer main body 11 is formed in a T-shape, and a valve case 3 having a groove 31 on the circumferential surface is fitted into the passage 2 so as to be freely movable. Attach the valve material 4 with screws 41.

The valve seat 5 of the valve seat 6 screwed onto the pressure reducing valve main body 1 is opposed to the valve material 4, and a spindle that is part of the valve pusher 7 and is fitted with the valve pusher 7 is disposed within the valve seat 6. A groove 72 is provided on the circumferential surface of the spindle 71 to allow communication between the inside of the valve seat 6 and the chamber 21 on the diaphragm 8 side. Communication hole (not shown)
It is established that

Furthermore, a high pressure nut 34 is screwed onto the pressure reducing valve main body 1 via a stabilizer 32 and a high pressure spring 33 on the other end side of the valve case 3, and this high pressure nut 34 and the pilot pressure reducing mechanism 10 are connected by a foot screw 101. At the same time, the pressure reducing mechanism 10 and the passage 92 of the bottom flange 91 forming the back chamber 9 were made to communicate through a pipe 102.

With the above configuration, the pilot pressure reduction mechanism 10 is operated to set a predetermined pressure reduction, and the inlet joint 14
When connected to the gas cylinder side, the high pressure gas flowing in from the inlet joint 14 passes through the filter 12, the passage 2 of the pressure reducing valve body 1,
Circumferential groove 31 of valve case 3. It flows into the pilot pressure reducing mechanism 10 via the high pressure nut 34 and foot screw 101, is reduced to a predetermined pressure, flows into the back chamber 9 through the pipe 102 and the bottom flange 910 passage 92, and is applied to the diaphragm 8 at the predetermined pressure. Apply reduced pressure.

The diaphragm 8 that has received the predetermined pressure moves to the passage 2 side together with the valve pusher 7 and the spindle 71, and the movement of the spindle 71 pushes the valve case 3 via the screw 41, pushing the valve material 4 away from the valve seat 5. While separating the high-pressure gas from the passage 2 side, the pressure is reduced and the gas flows into the valve seat 6 through the gap between the valve material 4 and the valve seat 5. 21. Main body 1
It is supplied to the secondary side from an outlet joint 23 through a passage 22 provided in the outlet joint 23.

When the above-described pressure reduction ratio from the passage 2 side to the valve seat 6 side is large, the gas flow flowing from the gap between the valve seat 5 and the valve material 4 into the valve seat 6 to the chamber 21 side increases significantly and reaches supersonic speed. Therefore, a shock wave is generated and hits the valve leaflet 81 side of the diaphragm 8, but this diaphragm 8 has two valve leaflets 8
1.82, a disc 83, and an annular plate 84, and a gap 85 between the disc 83 and annular plate 84 communicates with the outside through a through hole 86. The air is discharged to the outside through the hole 86,
By the time of the next impact, external air is sucked in through the hole 86 and the gap 85 returns to its original position, and this operation is repeated for each impact to absorb or alleviate the shock wave.

As described above, the automatic control pressure reducing valve of the present invention includes the diaphragm 8, the plurality of valve membranes 81.82, and the valve membranes 81.8.
Disc 83 made of metal or other hard material opened at 2
and an annular plate 84, and a sliding link (186) that communicates the gap 85 between the two plates 83 and 84 with the outside of the annular plate 84, but the diaphragm 8 This eliminates the occurrence of vibration and eliminates the repeated hitting of the valve material 4 by the valve pusher 7.
This prevents damage and can withstand long-term continuous use.

[Brief explanation of the drawing]

FIG. 1 is a simplified sectional view showing a conventional example, and FIG. 2 is a simplified sectional view showing main parts of the present invention. 1... pressure reducing valve body, 2... passage, 3...
... Valve case, 4... Valve material, 5...
... Valve seat, 6... Valve seat, 7...
...Valve push, 8...Diaphragm, 9.
... Back chamber, 10 ... Decompression mechanism, 81.8
2... Valve leaflet, 83... Disc, 84...
...Annular plate, 85...Gap, 86...
・Through hole.

Claims (1)

[Scope of utility model registration request] A valve case 3 is movably provided in a passage 2 communicating with the gas cylinder side of the pressure reducing valve body 1, and a valve material 4 of the valve case 3 is provided.
A valve seat 6 having a valve seat 5 facing the main body 1
A valve pusher 7 provided inside the valve seat 6 and installed inside the valve seat 6.
In a pressure reducing valve having one end facing the valve material 4 and the other end facing the diaphragm 8, the back chamber 9 of the diaphragm 8 is communicated with the passage 2 via the pilot pressure reducing mechanism 10. 8, a plurality of valve leaflets 81.82, a disk 83 and an annular plate 84 made of metal or other hard material opened in the valve leaflets 81.82, and a gap 85 between the drawing plates 83.84 and the annular plate. 84. An automatic control pressure reducing valve characterized by comprising a through hole 86 which communicates with the outside.