JP2003316445A - Pressure regulating valve with shut-off valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pressure regulating valve with a shut-off valve which responds rapidly and operates surely. <P>SOLUTION: In the pressure regulating valve with the shut-off valve which operates the shut-off valve 16 by a pressure variation in a diaphragm chamber R into which a secondary pressure is introduced, a channel is provided between a primary pressure gas channel and the diaphragm chamber R via a pilot valve 08. The pilot valve 08 is composed of a valve body 13 provided on a bottom end face of an interlocking piece 04, and a valve seat 14 formed on an upper part of a hollow spindle 15 inserted in a through-hole 07. The interlocking piece 04 and a frame body 10 are connected with a long hole 09 provided on the frame body 10 and a pin 12 embedded on the interlocking piece 04 with play. The shut-off valve 16 is composed of a spring seat 20 provided in the primary pressure gas channel, a spring 22 loaded on the spring seat 20, a shut- off valve body 21 which is biased with the spring 22, and a valve seat Q formed in a main body 18. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure regulating valve with a shutoff valve which operates when the pressure on the secondary side of the pressure regulating valve becomes abnormally high.

[0002]

2. Description of the Related Art A shut-off valve (OPSO = Over Press) which operates when the secondary pressure of a pressure regulating valve becomes higher than a specified value.
The one that has been used so far is a pressure regulating valve 50 and a shutoff valve 40 arranged in series as shown in FIG. 7, and the pressure regulating valve 50 is installed in a diaphragm chamber 41 of the shutoff valve 40. When the secondary pressure is introduced and the secondary pressure becomes abnormally high, the diaphragm 42 is displaced, the interlock 43 is retracted, the notch 46 of the spindle 45 is disengaged, and the spring 47 urges the valve element 44 to move the valve seat 44. It comes into contact with 48 and shuts off the primary pressure gas passage. The spindle 4
There is a knob 49 for resetting at the upper end of 5, and the knob 49 is reset by pulling up the knob.

[0003]

The above-mentioned conventional shutoff valve is
Due to the external force from the spring and the presence of the O-ring between the spindle and the main body, the sliding resistance was high, the response was poor, the operation was uncertain, and a large diaphragm was required.

In view of the above-mentioned problems of the prior art, it is an object of the present invention to provide a pressure regulating valve with a shutoff valve, which has good responsiveness, is small in size and simple in structure, and operates reliably.

[0005]

In order to solve the above problems, the present invention introduces the secondary pressure of a pressure regulating valve into a diaphragm chamber of a shutoff mechanism, and operates the shutoff valve when the secondary pressure is normal. In a pressure regulating valve with a shutoff valve that operates to shut off the shutoff valve when abnormal, open the flow path with the pilot valve interposed from the primary pressure gas flow path toward the diaphragm chamber, and open the pilot The valve employs a configuration that opens upon initial movement of the diaphragm due to abnormal secondary pressure.

The pilot valve includes a valve body provided on a lower end surface of an interlocking member that cooperates with a diaphragm, and a valve seat formed in an upper frame of a hollow spindle inserted into a through hole at a lower center of the diaphragm case. The interlocking element and the frame are connected with play, and the interlocking element and the frame are provided with a long hole formed in the frame and a pin implanted in the interlocking element, or the upper end is contracted. The shut-off valve has a spring seat and a spring mounted on the spring seat in the primary gas flow path, and is configured to be connected with play by a frame body that is a diametrical cylindrical body and a brim formed at the lower end of the interlocking member. And a shut-off valve body biased toward the valve seat by this spring, and a valve seat formed in the main body.

According to the present invention constructed as described above, the pilot valve is opened without the sliding resistance of the spindle portion where the O-ring is present at the initial movement of the diaphragm due to the abnormally high secondary pressure, and thereafter. The primary pressure is introduced into the diaphragm chamber through the pilot valve, the stopper is pulled up, and the shutoff valve operates reliably.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1A shows a portion of the pressure regulating valve X, and FIG. 1B shows a shutoff mechanism Y.

The pressure adjusting valve X introduces a secondary pressure into the diaphragm chamber 31, and the diaphragm 32 is displaced by the fluctuation of the secondary pressure, and the displacement moves the valve element 35 via the interlock element 33 and the lever 34. The secondary pressure is adjusted by adjusting the distance from the nozzle 36. The part of the pressure regulating valve X is basically the same as the conventional one.

The shut-off mechanism Y shown in FIGS. 1 (b) and 6 (a), 6 (b) has a diaphragm case 01 and a cover 02.
The outer peripheral edge of the diaphragm 03 is clamped by the portion where the diaphragm case 01 and the cover 02 are overlapped with each other, and the central portion is clamped by the interlock element 04 and the pressure receiving plate 05.

The interlock member 04 has a pin 12 perpendicular to the shaft.
Is planted and a rubber valve body 13 is fitted into the lower end.

A through hole 07 having a reduced diameter 06 is formed in the middle of the diaphragm case 01 in the lower center direction.

A spindle 15 of a stopper S is axially slidably inserted into the through hole 07 via an O-ring 11a, the spindle 15 is hollow and the upper end thereof is a valve seat 14 (nozzle). There is.

The interlocking member 04 is fitted in the frame member 10, the pin 12 is fitted in the elongated hole 09 of the frame member 10 with play, and the valve member 13 at the lower end of the interlocking member 04 and the valve seat 14 (nozzle) of the stopper. And constitute a pilot valve 08.

The frame 1 of the interlocking member 04 and the stopper S
6 (c), the portion corresponding to the frame of the stopper S is made into a cylindrical body 10a having a reduced diameter 10b at the upper part, and a collar 12 is fitted around the outer periphery of the interlocking member 04 fitted in this cylindrical body 10a.
It can also be connected with play by forming a.

The lower end of the spindle 15 penetrating through the through hole 07 projects to the end surface of the rod 17 of the shutoff valve 16 and the shutoff valve 16
Has been blocked.

The shutoff valve 16 is provided inside the main body 18,
A strainer 19 is fitted at the left end in the drawing, and then an inner annular spring seat 20 is formed, and a spring 22 for urging the shutoff valve body 21 is loaded on the spring seat 20 to shut off the shutoff valve body 2
1 has collars 23 formed at both ends of the central axis and O-rings 24 fitted therein, and is urged by the spring 22 and is slidably mounted toward the valve seat Q.

In the reset mechanism 25, a reset rod 27 is rotatably pierced in a cylindrical body 26 extending to the lower part of the main body 18 and is sealed by an O-ring 11b on the way, and a cap 29 is put on the lower end of the reset rod 27, so that the cap is A torsion spring T is fitted between the cylinder 29 and the cylinder body 26, and the kicking piece 28 at the upper end of the reset rod 27 has the right side flange 2 of the shutoff valve body 21.
It is in contact with 3.

FIG. 2 shows the second embodiment, which is basically the same as the embodiment of FIG. 1 except that the positional relationship between the pressure regulating valve X and the shutoff mechanism Y is 90 degrees in phase. The reset mechanism that does not appear in the figure is provided with the same phase as in FIG.

FIG. 3 shows a third embodiment, which is basically the same as the embodiment of FIG. 1 except that the pressure regulating valve X and the shutoff mechanism Y are arranged in series. A reset mechanism not shown in the figure can be the same as that shown in FIG.

FIG. 4 shows a fourth embodiment. This embodiment is adopted when the primary pressure is high. A spring seat 37 is formed at the lower end of the spindle 15 and a spring 38 is formed on the spring seat 37. And a cap nut 39 is screwed into the base of the case 40 to urge the spindle 15 downward.

By adding this mechanism, the O-ring 11a at the lower end of the spindle 15 is caused by the high primary pressure.
It is possible to prevent the shut-off valve 16 from malfunctioning by blocking the push-up of the valve by the spring 38.

Next, the operation of the pressure regulating valve with a shutoff valve according to the present invention will be described with reference to FIG.

FIG. 5A shows a normal state of the secondary pressure. In this state, the secondary pressure enters and is closed in the diaphragm chamber R. When the secondary pressure becomes higher than the prescribed value, the diaphragm 03 is displaced upward as shown in FIG. 5B, but at this time, the frame body 10 and the interlocking element 04 are connected with each other through the slot 09 and the pin 12 with play. Therefore, the interlock 04 moves upward regardless of the sliding resistance of the spindle 15, the pilot valve 08 opens, and the gas of the primary pressure begins to flow into the diaphragm chamber R via the pilot valve 08.

Further, the gas of the primary pressure is changed to the diaphragm chamber R.
5 (c), the diaphragm 03 is largely displaced and the spindle 15 begins to move up. Then, as shown in FIG.
As shown in (d), the spindle 15 rises, the stopper S is disengaged from the rod 17 of the shutoff valve 16, the shutoff valve 16 moves to the right, and the flow of LPG is shut off.

After a certain period of time, as shown in FIG. 5 (e), the gas in the diaphragm chamber R gradually flows out from the minute holes h, and the pressure in the diaphragm chamber R becomes 0 or the relief stop pressure.

For resetting, when the cap 29 of the reset mechanism 25 shown in FIG. 1B is turned, the kick piece 28 rotates and hits the left flange 23, the shutoff valve 16 returns to its original position, and the spindle 15 also returns to its original position. Return to position.

[0028]

As described above, according to the present invention, the shut-off valve operates reliably in response to a change in the secondary pressure.

[Brief description of drawings]

FIG. 1A is a vertical sectional view and FIG. 1B is a horizontal sectional view of a first embodiment.

FIG. 2 is a vertical sectional view of a second embodiment.

FIG. 3 is a vertical sectional view of a third embodiment.

FIG. 4 is a vertical sectional view of a fourth embodiment.

FIG. 5 is an explanatory view of the operation of the present invention.

FIG. 6A is a partial view of the diaphragm chamber and the shutoff valve. (B) Detailed view of the connecting part between the interlock and the stopper (C) Detailed view of the connection between other interlocking elements and stopper

FIG. 7 is a vertical sectional view of a conventional pressure regulating valve with OPSO.

[Explanation of symbols]

01 diaphragm case 02 cover 03 diaphragm 04 interlocking child 05 Pressure plate 06 diameter reduction 07 through hole 08 Pilot valve 09 long hole 10 frame 11, 11a, 11b, 24 O-ring 12 pin 13 valve 14 valve seat (nozzle) 15 spindles 16 shut-off valve 17 rod 18 body 19 strainers 20 spring seat 21 Shut-off valve body 22 spring 23 Tsuba 25 Reset mechanism 26 cylinder (of reset mechanism) 27 reset stick 28 Kicking pieces 29 caps 31 diaphragm room 32 diaphragm 33 interlock 34 lever 35 valve body 36 nozzles 37 Spring seat 38 springs 39 cap nut 40 cases Q valve seat R diaphragm room S stopper T torsion spring X Pressure control valve Y shut off mechanism

Claims (4)

[Claims] 1. A secondary pressure of a pressure regulating valve is introduced into a diaphragm chamber of a shutoff mechanism to prevent the shutoff valve from operating when the secondary pressure is normal, and to actuate the shutoff valve when abnormal. In the pressure control valve with a shutoff valve, the flow path with the pilot valve is opened from the primary pressure gas flow path to the diaphragm chamber, and the pilot valve is opened by the initial movement of the diaphragm due to the abnormal pressure of the secondary pressure. A pressure regulating valve with a shutoff valve, characterized in that 2. The pilot valve includes a valve body provided on a lower end surface of an interlocking member that cooperates with the diaphragm, and a valve formed in an upper frame of a hollow spindle inserted into a through hole at a lower center of the diaphragm case. The pressure regulating valve with a shut-off valve according to claim 1, wherein the pressure regulating valve comprises a seat, and the interlocking element and the frame are connected with play. 3. The shut-off valve includes a spring seat, a spring mounted on the spring seat, a shut-off valve body biased toward the valve seat by the spring, and an inside of the main body in the primary pressure gas passage. 3. The pressure regulating valve with a shutoff valve according to claim 1, wherein the pressure regulating valve comprises a valve seat formed in. 4. When the pressure regulating valve with a shutoff valve is used under a high primary pressure, a malfunction preventing mechanism for the shutoff valve is added. Pressure regulating valve with shutoff valve described.