JPH10103545A - Pressure opened type valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pressure opened type valve constituted in such a way that a main valve for opening/closing valve seats on the primary side and secondary side is operated by a piston reciprocated by primary side pressure. SOLUTION: A pressure opened type valve is provided with a cylinder C with a lower chamber 3 and an upper chamber 4 partitioned by a piston 2 mounted therein so as to be reciprocated, and the lower chamber 3 and the upper chamber 4 are communicated by a first small hole A provided in the piston 2. A primary pressure inflow port 5 provided at the lower chamber 3 is larger in area than the first small hole A of the piston 2, and the primary pressure inflow port 5 is connected to the primary side 1a of a valve body through a manual valve V. An ejector 10 with a second small hole B provided at an intermediate part has a third small hole B provided on the secondary side 1b of the valve body B and conductive to the upper chamber 4 of the piston 2. A fourth small hole F conductive to the second small hole B is proivded on the secondary side outer side face of the valve body V, and the third small hole E and the fourth small hole F are made conductive by a conduit 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure release valve which is operated by a piston whose main valve for opening and closing a primary side valve and a secondary side valve seat is reciprocated at a primary pressure.

[0002]

2. Description of the Related Art In Japanese Patent Application Publication No. 4-68508 published by the same applicant as the present invention, as shown in FIG.
1 has to be machined, and the machining of the mounting portion of the ejector 10 of the main valve 7 is complicated.

[0003]

SUMMARY OF THE INVENTION In view of the above-mentioned conventional example, the present invention aims to eliminate the conventional disadvantages by improving the shape of the ejector 10 and the place where the ejector 10 is provided.

[0004]

According to the present invention, there is provided a cylinder C which is provided so as to reciprocate a piston 2 and is provided with a lower chamber 3 and an upper chamber 4 provided separately, and a first small hole A provided in the piston 2. The lower chamber 3 and the upper chamber 4 communicate with each other, and the primary pressure inlet 5 provided in the lower chamber 3 is larger than the area of the first small hole A of the piston 2. _The piston stem 8 protruding from the piston 2 is connected to the upper chamber wall 4a of the cylinder C,
A main valve 7 having a primary pressure receiving area smaller than the primary pressure receiving area of the piston 2 which opens and closes the valve seat S is provided at the upper end of the main valve 7 which penetrates the secondary side 1b of the valve main body V and the valve seat S. Ejector 1 having second small hole B
0 is provided on the secondary side 1b of the valve V, has a small hole E that communicates with the upper chamber 4 of the piston 2, and a fourth small hole F that communicates with the second small hole B is an outer periphery of the secondary side 1b of the valve main body V. Conduction tube 1 provided on the surface and conducting between the third small hole E and the fourth small hole F
6, a spring 14 is provided between the main valve 7 and a stopper 15a provided on the lid 15 of the valve main body V so that the main valve 7 acts in a direction to close the valve seat S. This is a pressure release valve.

[0005]

The operation will be described with reference to FIGS. 1 shows the main valve 7 in a fully closed state, and FIG. 2 shows the main valve 7 in a fully open state. When the manual valve V ₁ is opened, the bottom chamber 3 of the piston 2,
The fluid on the primary side 1a flows in. The fluid that has flowed into the lower chamber 3 flows out of the first small hole A provided in the piston 2 to the upper chamber 4 of the piston 2, but the area of the inlet 5 of the lower chamber 3 is much larger than that of the first small hole A. Lower chamber 3 of piston 2
Is stored. The accumulated pressure becomes a force for pushing up the piston 2.

Since the area of the main valve 7 is smaller than the area on the side of the piston 2, the piston 2 moves upward and pushes up the main valve 7 through a piston stem 8 integrally formed with the piston 2 to open it. I do. Then, the fluid on the primary side 1a passes through the gap between the valve seat S and the main valve 7 and flows through the ejector 1
0 and flows out to the secondary side 1b.

The ejector 10 has a cylindrical shape, a second small hole B provided in the center, and a fourth small hole B provided on the secondary side 1b of the valve V
It is electrically connected to the small hole F. A third small hole (E) communicating with the upper chamber (4) of the piston (2) is provided, and the third small hole (E) and the fourth small hole (F) are connected by a conduction pipe (16).

The area of the inlet of the ejector 10 is
Is smaller than the area of the primary side 1c, the flow velocity of the fluid flowing into the ejector 10 increases, the pressure decreases, and the
The fluid in the upper chamber 4 of the piston 2 is sucked through the small hole B and discharged to the secondary side 1b. Then, the pressure P ₃ of the upper chamber 4 of the piston 2 becomes the pressure P ₃ of the lower chamber 3 of the piston 2.
₂ where a differential pressure ΔP = P ₂ −P ₃ occurs.

The differential pressure ΔP is a force for pushing the piston 2 upward. This force is greater than the sum of the weights of the main valve 7 and the piston 2, and the main valve 7
It moves (rises) until it hits a, and is fully opened (FIG. 2).

FIG. 3 shows another embodiment. A short pipe 1 in which the ejector 10 is connected not to the valve V but to the secondary side of the valve V
FIG. 7 is a cross-sectional view in the case where it is provided at 7.

FIG. 4 is a sectional view showing a case where the ejector 10 has an orifice shape. In this case, the orifice may be integral with the valve.

FIG. 5 is a sectional view showing a case where the piston 2 is provided above the main valve 7.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 1 shows a state where the primary side 1a and the secondary side 1b are closed by the main valve, and FIG. 2 shows a state where the primary side 1a and the secondary side 1b are opened by the main valve 7. V is a valve main body having a valve seat S whose primary side 1a and secondary side 1b are opened and closed by a main valve 7; 2 is a piston provided inside a cylinder C of the valve main body V so as to reciprocate up and down; Is a lower chamber and an upper chamber of the piston 2 of the cylinder C, and 5 is a lower chamber 3 of the cylinder C.
A primary fluid inlet provided in, is connected through the manual valve V ₁ on the primary side 1a of the valve main body V, a first hole A communicating the lower chamber 3 and the upper chamber 4 is provided on the piston 2 The diameter of the small hole A is much smaller than the diameter of the primary pressure inlet 5.

Reference numeral 4a denotes an upper chamber wall of the cylinder C, and a piston stem 8 having a lower end fixed to the piston 2 slidably passes through the upper chamber wall 4a. Piston stem 8
A main valve 7 having a pressure receiving area smaller than the pressure receiving area of the piston 2 that opens and closes the valve seat S is mounted above the valve seat S that separates the primary side 1a and the secondary side 1b. A seat ring 9 for opening and closing the valve seat S is attached to the lower surface of the valve 7, and a stopper 15 a is provided on a lid 15 provided at the upper end on the primary side of the valve main body V, and between the stopper 15 a and the main valve 7. The coil spring 14 is elastically mounted so as to always push down the main valve 7 toward the valve seat S.

The primary 1a and the primary fluid inlet 5 of the valve main V is has a flow path which is opened and closed by manual valves V _1,
When the manual valve V ₁ in the "open" fluid of the primary side 1a in the lower chamber 3 of the piston 2 flows. The fluid flowing into the lower chamber 3 flows out of the first small hole A provided in the piston 2 to the upper chamber 4 of the piston 2, but the area of the inlet 5 of the lower chamber 3 is much larger than the area of the first small hole A. Piston 2 for
Is stored in the lower chamber 3. The accumulated pressure becomes a force for pushing up the piston 2. The area of main valve 7 is piston 2
, The piston 2 moves upward and pushes up the main valve 7 through the piston stem 8 which is integrally protruded therewith, thereby opening it.

Then, the fluid on the primary side 1a flows into the ejector 10 through the gap between the valve seat S and the main valve 7 and flows out to the secondary side 1b, but the ejector 10 is cylindrical and has a second small hole B at the center. And is electrically connected to a fourth small hole F provided on the secondary side 1b of the valve main body V. The cylinder C is provided with a third small hole E that communicates with the upper chamber 4 of the piston, and the third small hole E and the fourth small hole F are connected by a conduction pipe 16.

Since the inlet area of the ejector 10 is smaller than the area of the one side chamber 1c of the ejector 10, the flow velocity of the fluid flowing into the ejector 10 increases, the pressure decreases, and the upper chamber 4 of the piston 2 passes through the second small hole B. Inhaling fluid
Release to the secondary side 1b. Then the pressure P ₃ in the upper chamber 4 of the piston 2 is lower than the pressure P ₂ in the lower chamber 3 of the piston 2, where occurs the differential pressure △ P = P ₂ -P _3.

The pressure difference ΔP is a force for pushing the piston 2 upward. This pushing force is the force acting downward, that is, the force of the spring 14. Since the area of the main valve 7 is smaller than the area on the piston 2 side, the piston 2 moves upward and pushes up the main valve 7 through a piston stem 8 which is integrally provided therewith to open it. Then, the flow of the fluid on the primary side 1a becomes two ways. One is a flow F which flows between the seat ring 9 and the ejector 10,
The other is the flow f flowing between the ejector 10 and the upper chamber 4 of the piston.

FIG. 3 shows a case where the ejector 10 is provided not on the valve main body V but on a short pipe 17 connected to the secondary side of the valve main body V. The operation is the same as that described with reference to FIGS.

FIG. 4 shows a case where the ejector 10 has an orifice shape and is provided on the secondary side of the valve main body V.
The operation is the same as that described with reference to FIGS.

FIG. 5 shows a case where the piston 2 and the cylinder C are provided above the valve main body V. The operation is the same as that described with reference to FIGS.

[Brief description of the drawings]

FIG. 1 is a sectional view of one embodiment of the present invention.

FIG. 2 is a sectional view of the operating state of FIG.

FIG. 3 is a sectional view of a second embodiment of the present invention.

FIG. 4 is a sectional view of a third embodiment of the present invention.

FIG. 5 is a sectional view of a fourth embodiment of the present invention.

FIG. 6 is a sectional view of a conventional pressure release valve.

[Explanation of symbols]

V valve main second piston 3 one side chamber C cylinder V ₁ manual valve 4a of the lower chamber 4 secondary side 1c ejector primary side 1b valve mainly the upper chamber 5 primary fluid inlet 7 main valve 9 the piston ring 1a valve main cylinders of the cylinder Upper chamber wall of cylinder S Valve seat A First small hole B Second small hole E Third small hole F Fourth small hole 10 Ejector 14 Spring 15 Lid 16 Conductive tube

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[Procedure amendment]

[Submission date] March 19, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document Name] Statement

[Title of the Invention] Pressure release valve

[Claims]

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure release valve used in fire fighting equipment such as a sprinkler digestion equipment.

[0002]

BACKGROUND OF THE INVENTION pressure release valve for use in conventional fire-fighting equipment such as sprinkler digestion equipment, opens the manual valve V ₁ as shown in FIG. 6, the primary fluid inlet 5 of the cylinder C provided in the valve main V The high pressure fire-extinguishing water on the primary side is supplied to the lower chamber 3 of the cylinder C to push up the piston 2 upward.
By opening the main valve 7 and the valve seat S provided at the tip of the piston stem 8 protruding from the side, the high-pressure fire-extinguishing water on the primary side 1a flows into the secondary side 1b, and the pipe connected to the secondary side 1b It is configured to discharge water high pressure extinguishing water from water spray head or the like provided at the tip portion, also, by cutting off the supply of primary high pressure extinguishing water into the lower chamber 3 of the cylinder C by closing the manual valve V _1, the main Stopper 15 provided on valve 7 and lid 15
The main valve 7 is lowered by the return spring force of the coil spring 14 elastically mounted between the piston 2 and the fire extinguishing water filled in the lower chamber 3 to flow into the upper chamber 4 from the small hole A provided in the piston 2 and The pressure release valve is closed by discharging to the sewage or the like from a discharge hole E provided in the upper chamber 4.

[0003]

However, in the conventional pressurized release valve constructed as described above, the fire extinguishing water filled in the lower chamber 3 and the upper chamber 4 when the pressurized release valve is opened and closed. In addition to the need for a drain pipe 21 and a pressure regulating valve 22 for discharging wastewater into sewage and the like, there is a problem that the laying work is troublesome and takes a long time.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a pressurized release valve which does not require the extinguishing water filled in the lower chamber 3 and the upper chamber 4 to be discharged to sewage or the like. I do.

[0005]

According to the present invention, there is provided a cylinder C which is provided so as to reciprocate a piston 2 and which is provided with a lower chamber 3 and an upper chamber 4 provided separately, and a first small hole A provided in the piston 2. The lower chamber 3 and the upper chamber 4 communicate with each other. The primary pressure inlet 5 provided in the lower chamber 3 is larger than the area of the first small hole A of the piston 2, and the primary pressure inlet 5 is connected to the primary side 1a of the valve main body V. and are connected via manual valves V _1, the piston stem 8 projecting from the piston 2 passes through the upper chamber wall 4a of the cylinder C, and the secondary side 1b and the valve seat S of the valve V mainly its upper end Is provided with a main valve 7 having a primary pressure receiving area smaller than the primary pressure receiving area of the piston 2 for opening and closing the valve seat S, and an ejector 10 having a second small hole B in the middle is provided on the secondary side 1b of the valve main body V. And the upper chamber of the cylinder C 4 has a third small hole E which is electrically connected to
The fourth small hole F conducting to the small hole B is the secondary side 1 of the valve main body V.
b, a conduction pipe 16 for conducting the third small hole E and the fourth small hole F, and a main valve 7 provided between the main valve 7 and a stopper 15a provided on the lid 15 of the valve main body V. The spring 14 that acts in the direction in which the valve seat S closes is elastically mounted to constitute a pressure release valve, thereby solving the conventional problems.

By opening the manual valve V ₁ , high-pressure fire-extinguishing water on the primary side 1 a flows into the lower chamber 3 of the cylinder C from the primary pressure inlet 5.

The high-pressure fire-extinguishing water that has flowed in flows out of the first small hole A provided in the piston 2 into the upper chamber 4 of the cylinder C. The area of the primary pressure inlet 5 provided in the lower chamber 3 is reduced by the area of the first small hole A. Because it is much larger, the lower chamber 3 of the cylinder C accumulates.

The accumulated pressure causes the piston 2 to rise, and the main valve 7 provided at the tip of the piston stem 8 protruding from the piston 2 is pushed upward against the spring force of the spring 14. The main valve 7 and the valve seat S are opened, and the high-pressure fire-extinguishing water on the primary side 1a flows out to the secondary side 1b.

At this time, the second small hole B provided in the ejector 10 and the fourth small hole F provided in the secondary side 1b of the valve main body V are electrically connected, and the fourth small hole F and the upper part of the cylinder C The ejector 10 is connected to the third small hole E provided in the chamber 4 by a conduction pipe 16, and the inner diameter 1 d of the ejector 10 at the central part is smaller than the inner diameter 1 c of the inlet part. Is faster and the pressure is lower.

[0010] Therefore, the high-pressure extinguishing water in the upper chamber 4 of the cylinder C is drawn into the secondary side 1b, the pressure P ₃ in the upper chamber 4 of the cylinder C is lower than the pressure P ₂ in the lower chamber 3 of the cylinder C And a differential pressure ΔP = P ₂ −P ₃ is generated. The pressure difference ΔP is larger than the force for pushing the piston 2 upward, that is, the sum of the spring force of the coil spring 14 and the weight of the main valve 7 and the piston 2.
The main valve 7 and the valve seat S move completely (up) until it reaches 5a, and the main valve 7 and the valve seat S are completely opened.

[0011] To close the pressure release valve by blocking the inflow of high pressure extinguishing water into the lower chamber 3 of the cylinder C by closing the manual valve V _1, provided in the main valve 7 and the lid 15 Coil spring 14 mounted between stopper 15a
The main valve 7 descends due to the return spring force of the above, and the fire extinguishing water filled in the lower chamber 3 flows through the small hole A provided in the piston 2 through the upper chamber 4.
Through the third small hole E provided in the upper chamber 4.
6 to the secondary side 1b, and the main valve 7
When it comes into close contact with the pressure release valve, the pressure release valve is completely closed.

Therefore, when the pressure release valve is opened and closed, there is no need for any piping equipment or the like for draining the fire extinguishing water filled in the lower chamber 3 and the upper chamber 4 into sewage or the like.

Further, by providing the above-mentioned ejector 10 in the short pipe 17 connected to the secondary side 1b of the valve main body V, even if it is an existing pressurized release valve, as described in claim 2, A pressure release valve that does not require any laying of piping or the like for draining the fire-extinguishing water filled in the chamber 3 and the upper chamber 4 into sewage or the like can be obtained.

According to a third aspect of the present invention, the orifice-shaped ejector 10 is integrally provided on the secondary side 1b of the bulge main body V or is detachably provided depending on the mode of use. An opening valve can be provided at low cost.

Further, as described in claim 4,
By providing the cylinder C on the upper side of the valve main body V, when the pressurizing release valve of the present invention is installed in a storage space where only the upper part is open, maintenance, inspection, repair, and the like can be performed simply by removing the lid 15. Maintenance can be performed very easily.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention, and FIG. 2 is a longitudinal sectional view showing an operation state.

In the figure, V is a valve main body having a valve seat S whose primary side 1a and secondary side 1b are opened and closed by a main valve 7, C is a cylinder, and 2 is an interior so as to reciprocate up and down in the cylinder C. The pistons 3 and 4 are divided into an upper chamber and a lower chamber separated by the piston 2 of the cylinder C.
Is a primary fluid inlet provided in the lower chamber 3 of the cylinder C, the primary side 1a of the valve main body V through the manual valve V ₁
The piston 2 is provided with a first small hole A communicating the lower chamber 3 and the upper chamber 4, and the diameter of the first small hole A is much smaller than the diameter of the primary pressure inlet 5.

Reference numeral 4a denotes an upper chamber wall of the cylinder C, and a piston stem 8 having a lower end fixed to the piston 2 penetrates the upper chamber wall 4a in a slidable manner. Piston stem 8
A main valve 7 having a pressure receiving area smaller than the pressure receiving area of the piston 2 that opens and closes the valve seat S is mounted above the valve seat S that separates the primary side 1a and the secondary side 1b. A seat ring 9 for opening and closing the valve seat S is attached to the lower surface of the valve body 7, a stopper 15a is provided on a lid 15 provided at the upper end of the valve body V, and a coil spring is provided between the stopper 15a and the main valve 7. The main valve 7 is constantly pressed toward the valve seat S by the spring force of the coil spring 14.

The primary 1a and the primary fluid inlet 5 of the valve main V is has a flow path which is opened and closed by manual valves V _1,
When the manual valve V ₁ to the "open", the high-pressure extinguishing water in the primary side 1a flows into the lower chamber 3 of the cylinder C as shown in FIG. The high-pressure fire extinguishing water that has flowed into the lower chamber 3 flows into the upper chamber 4 of the cylinder C from the first small hole A provided in the piston 2, and the area of the primary pressure inlet 5 of the lower chamber 3 is equal to the area of the first small hole A. The pressure in the lower chamber 3 of the cylinder C is much larger. The accumulated pressure becomes a force for pushing up the piston 2. Since the area of the main valve 7 is smaller than the area of the piston 2, the main valve 7 is pushed upward and “opened” against the spring force of the coil spring 14.

Then, the high-pressure fire-extinguishing water on the primary side 1a flows through the gap between the valve seat S and the main valve 7 to the secondary side 1b where the ejector 10 is provided. In the ejector 10, the inner diameter 1d at the center is smaller than the inner diameter 1c at the inlet, and the flow rate of the high-pressure fire-extinguishing water flowing into the ejector 10 is increased, and the pressure is reduced. The ejector 10 has a cylindrical shape, a second small hole b provided at the center, and a fourth small hole F provided on the secondary side 1b of the valve main body V.
The fourth small hole F and the third small hole E provided in the upper chamber 4 of the cylinder C are connected by a conduction tube 16.

[0021] From this, extinguishing water in the upper chamber 4 of the cylinder C is drawn into the secondary side 1b, the pressure P ₃ in the upper chamber 4 of the cylinder C becomes lower than the pressure P ₂ in the lower chamber 3 of the cylinder C , A differential pressure ΔP = P ₂ −P ₃ is generated.

This differential pressure ΔP is a force for pushing the piston 2 further upward. This pushing force works downward,
That is, the force becomes greater than the sum of the spring force of the coil spring 14 and the weight of the main valve 7 and the piston 2, and the main valve 7 moves (ups) until it hits the stopper 15a, and is fully opened.

[0023] In Thus, close manual valves V _1, in conjunction with the main valve 7 piston stem 8 and the piston 2 descends by the return spring force of the coil spring 14, the cylinder C
The fire extinguishing water filled in the lower chamber 3 flows into the upper chamber 4 of the cylinder C from the first small hole A provided in the piston 2, passes through the third small hole E provided in the upper chamber 4 via the conduction pipe 16. The gas is discharged to the secondary side 1b of the valve main body V, the seat ring 9 provided on the main valve 7 comes into close contact with the valve seat S, and the pressure release valve is completely closed.

Therefore, no drain pipe or pressure regulating valve is required for draining the fire extinguishing water remaining in the lower chamber 3 and the upper chamber 4 into sewage or the like, and the pressure release valve can be reliably opened and closed. .

FIG. 3 is a longitudinal sectional view showing a second embodiment of the present invention. In this embodiment, a short pipe 17 in which the above-described ejector 10 is connected to the secondary side 1b of the valve main body V is shown.
And a fourth small hole F communicating with a second small hole B provided in the body of the ejector 10 is formed in the outer peripheral surface of the short pipe 17, and the fourth small hole F is provided in the upper chamber 4 of the cylinder C. The third small hole E is connected by a conduction tube 16. By configuring the pressure release valve in this way, even with the existing pressure release valve, a drain pipe or a pressure regulating valve for draining the fire extinguishing water remaining in the lower chamber 3 and the upper chamber 4 into sewage or the like. A pressurized release valve that can reliably perform the opening and closing operation without any need for the above is obtained.

FIG. 4 is a longitudinal sectional view showing a third embodiment of the present invention in which an orifice-shaped ejector 10 is provided on the secondary side 1b of the valve main body V. Integral with the secondary side 1b of V
Alternatively, a pressurized release valve that does not require any drainage pipe or pressure regulating valve for draining fire extinguishing water remaining in the lower chamber 3 and the upper chamber 4 to sewage or the like is provided at a lower cost by being detachably provided. I can do it.

FIG. 5 shows a cylinder C above the valve main body V.
FIG. 9 is a longitudinal sectional view showing a fourth embodiment of the present invention provided with
By providing the cylinder C on the upper side of the valve main body V in this manner, for example, when the pressure release valve of the present invention is installed in a manhole type upper open storage space, the lid 15 can be simply removed. Maintenance such as maintenance inspection and repair can be performed very easily.

The same reference numerals in FIGS. 3 to 5 denote the same members.

[0029]

According to the present invention, as described above, a drain pipe for draining fire extinguishing water remaining in the lower chamber 3 and the upper chamber 4 of the cylinder C into sewage and the like can be surely opened and closed. There is an excellent advantage that it is possible to provide a pressure release valve which does not require any pressure control valve or the like.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing an operation state.

FIG. 3 is a longitudinal sectional view showing a second embodiment.

FIG. 4 is a longitudinal sectional view showing a third embodiment.

FIG. 5 is a longitudinal sectional view showing a fourth embodiment.

FIG. 6 is a longitudinal sectional view of a conventional pressure release valve.

[Description of Signs] V Valve Main Body 2 Piston 3 Lower Chamber 4 Upper Chamber 4a Upper Chamber Wall 5 Primary Pressure Inlet 7 Main Valve 8 Piston Stem 1a Primary Side of Valve Main V 1b Secondary Side of Valve Main V C Cylinder V ₁ Manual Valve S Valve seat A First small hole B Second small hole E Third small hole F Fourth small hole 10 Ejector 14 Spring 15 Lid 15a Stopper 16 Conductor tube

[Procedure amendment 2]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG.

FIG. 2

FIG. 3

FIG. 4

FIG. 5

FIG. 6

Claims (4)

[Claims] 1. A cylinder C which is provided so as to reciprocate a piston 2 and is provided with a lower chamber 3 and an upper chamber 4 provided separately.
The lower chamber 3 and the upper chamber 4 communicate with each other through a first small hole A provided in the piston 2, and the primary inlet 5 provided in the lower chamber 3 is
Larger than the area of the first eyelet A piston 2, the primary fluid inlet 5 is connected via a primary side 1a and a manual valve V ₁ of the valve main body V, the piston stem 8 projecting from the piston 2 cylinder C A main valve 7 having a primary pressure receiving area smaller than the primary pressure receiving area of the piston 2 that opens and closes the valve seat S is provided at the upper end of the upper chamber wall 4a, the secondary side 1b of the valve V, and the valve seat S. Ejector 10 having a second small hole B in a cylindrical middle portion of the secondary side 1b.
Is provided on the secondary side 1b of the valve main body V, has a third small hole E that communicates with the upper chamber 4 of the piston 2, and a fourth small hole F that communicates with the second small hole B is formed on the outer periphery of the secondary side of the valve main body V. Conduction tube 1 provided on the surface and conducting between the third small hole E and the fourth small hole F
6, a spring 14 is provided between the main valve 7 and a stopper 15a provided on the lid 15 of the valve main body V, so that the main valve 7 acts in a direction to close the valve seat S. Pressurized release valve. 2. The pressurized release valve according to claim 1, wherein the ejector is provided in a short pipe connected to the secondary side of the valve. 3. The pressure relief valve according to claim 1, wherein the orifice-shaped ejector is integrally provided on the secondary side of the valve. 4. The pressurized release valve according to claim 1, wherein the piston is provided above the main valve.