JP2005087516A - Pressure reducing valve with manual opening/closing mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To miniaturize a pressure reducing valve with an integrated manual opening/closing valve to be stored inside a fire hose storage box. <P>SOLUTION: A secondary side pressure receiving part for pressure reduction is divided into two sections; an upper piston 6 as a first pressure receiving section is set above a valve rod 2 and a lower piston 15 as a second pressure receiving section is set under the valve rod 2 disposed in the vertical direction inside the housing of the device. The lower piston 15 is energized upward from below by a pressure adjusting spring 18, and the upper piston 6 can be dislocated downward from above by a handle 13 which is a control part of the manual opening/closing mechanism. The opening/closing valve consisting of a disk 3 and a valve seat 1a is disposed at an intermediate position between the upper piston 6 and the lower piston 15 so that the valve is integrated with the pressure reducing valve mechanism. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a pressure reducing valve, and more particularly to a pressure reducing valve used in fire extinguishing equipment.

  Among the pressure reducing valves used in fire extinguishing equipment, the conventional easy-operated No. 1 fire hydrant has a provision that the water pressure must not exceed 0.7 MPa when the water is discharged. As shown in Fig. 2, a pressure reducing valve was installed outside the hose storage box.

4 is an assembly drawing of the easy-to-operate No. 1 fire hydrant, in which 41 is a case of the main body, 45 is a manual on-off valve, 46 is a hose, 48 is a nozzle, and 49 is installed outside the case 41 of the main body. The pressure reducing valve. A primary water pressure P ₁ is applied to the pressure reducing valve 49.

FIG. 5 shows a sectional view of the pressure reducing valve 49. Since such a structure is known, detailed description is omitted, but the primary water pressure P ₁ input as an arrow A slides in the cylinder 54 and is adjusted by the pressure adjusting spring 53. is depressurized by the pressure receiving surface D _0, is output to the arrow B as the secondary-side pressure P _2.

As shown in FIG. 5, this pressure reducing valve reduces the pressure in the hose to 0.7 MPa or less during water discharge and keeps the pressure in the hose at 0.7 MPa or less even when the nozzle at the tip of the hose is closed. the large pressure receiving surface _{D 0,} can not be placed at a height 500 mm, face-to-face length 180 mm, since a large apparatus having a width of about 140mm hose storage within boxes, have been installed outside. Therefore, there is a problem that it takes a space and does not give a refined appearance. The present invention solves such a problem, and at the same time intends to integrate and reduce the size of the conventional open / close valve and pressure reducing valve separately installed in the hose storage box.

  In order to solve the above-described problems, the present invention has a structure in which a manual open / close valve is integrated with a pressure reducing valve provided in a fire hose storage box. Moreover, the secondary pressure receiving part for pressure reduction was divided | segmented into two, and the 1st pressure receiving part and the 2nd pressure receiving part were provided. Further, the manual opening / closing mechanism includes an opening / closing valve at an intermediate position between the first pressure receiving portion and the second pressure receiving portion.

  Since piping is simplified, it is possible to obtain an advantageous effect that the construction period, construction cost, and material cost can be greatly reduced. In addition, since the size is reduced, the use space is also reduced. Furthermore, an advantageous effect that the appearance is clean and refined can be obtained.

  The secondary pressure receiving part for pressure reduction is divided into two. That is, an upper piston, which is a first pressure receiving portion, and a lower piston, which is a second pressure receiving portion, are installed below the valve rod disposed in the vertical axis direction in the housing of the apparatus. The lower piston is biased upward by a pressure adjusting spring from below, and the position of the upper piston can be changed from above to below by a handle which is an operation part of a manual opening / closing mechanism.

An on-off valve is disposed at an intermediate position between the upper piston and the lower piston, and is integrated with the pressure reducing valve mechanism.

  1, 2, and 3 are for explaining the present invention. FIG. 1 is a sectional view of a state in which both the pressure reducing valve and the on-off valve are closed, and FIG. FIG. 3 is a cross-sectional view showing a state where both the pressure reducing valve and the on-off valve are open, and the on-off valve is opened to the maximum.

  In FIG. 1, reference numeral 1 denotes a valve box, and a primary water pressure is input as indicated by an arrow A, and a secondary water pressure is output as indicated by an arrow B. Reference numeral 2 denotes a valve rod that penetrates the valve box 1 in the vertical direction, and a lower piston 15 that slides on the inner diameter of the cylinder portion 115 at the lower part of the valve box 1 is attached by a spring washer 16 and a nut 17. A disc 3 is made of rubber and is fixed to the valve stem 2 by a disc retainer 4 and a fixing nut 5.

  6 is an upper piston. The inner diameter of the cylinder part 86 in the bonnet 8 attached to the upper part of the valve box 1 is slid. It is attached to the valve stem 2 by a fixing nut 7.

  A portion in which the valve stem 2, the disc 3, the disc retainer 4, the fixing nut 5, the upper piston 6 and the lower piston 15 are integrated is referred to as a disc assembly.

  8 is a bonnet attached above the valve box 1, 9 is a stem guide, and 10 is a stem.

  11 is an upper cover that covers the upper side of the bonnet 8, 12 is a bolt that connects the bonnet 8 and the upper cover 11, 13 is a handle for switching between opening and closing, and 14 is a handle for fixing the handle 13 to the stem 10. It is a nut.

  Reference numeral 18 denotes a coil spring-shaped adjusting spring, and 19 denotes a spring guide that receives one end of the pressure adjusting spring 18. Reference numeral 20 denotes a spring case which is attached to the lower end of the valve box 1 and accommodates the pressure adjusting spring 18 and the like. Reference numeral 21 denotes a fixing nut. Reference numeral 22 denotes a lower surface of the spring guide 19. It is a pressure adjusting bolt, and the state is fixed by the fixing nut 21 after pressure adjustment.

  Reference numerals 23 to 31 denote rubber O-rings which are arranged at predetermined positions.

  The decompression function is performed as follows. When the handle 13 is operated (details will be described later) and the on-off valve is opened, the adjusting bolt 22 is turned to compress the pressure adjusting spring 18, and the integrated disc assembly moves upward via the lower piston 15. 1 shifts from the state of FIG. 1 to the state of FIG. 2, and both the on-off valve and the pressure reducing valve are opened. The primary fluid passes through the disk opening K opened by the above operation, passes through the small hole 2c, further passes through the upper piston chamber conduction hole 2d, passes through the small hole 6c, and flows into the upper piston chamber 6d to be accumulated. The other fluid passes through the conduction hole 1c and flows into the lower piston chamber 15b to be accumulated.

Now, the primary pressure is P ₁ (MPa), the secondary pressure is P ₂ (MPa), the primary pressure receiving areas of the disc 3 and the lower piston 15 of the disc assembly are A (cm ² ) and B (cm ² ), respectively. The secondary pressure receiving areas of the lower piston 15 and the upper piston 6 are C (cm ² ) and D (cm ² ), respectively (the pressure receiving surfaces A, B, C, and D are shown in FIG. 2), and pressure adjustment If the urging force of the spring 18 is W, the force that pushes up the disc 3, the upper piston 6, and the lower piston 15 integrated by the valve stem 2 is as follows:
P ₁・ A + W ------------------- (1)
And
Force pushing down the downwardly _{P 1 · B + P 2 ·} C + P 2 · D -------------- (2)
It becomes.
Since the condition for them to equilibrate is (1) = (2),
_{P 1 · A + W = P} 1 · B + P 2 · C + P 2 · D -------- (3)
It becomes. By setting A = B, W = P ₂ · C + P ₂ · D
= P ₂ (C + D) ------------------ (4)
It becomes. The (4) changes according to the force W and pressure receiving area of the piston of the secondary side pressure P ₂ is the pressure regulating spring 18, it can be seen that not related to the variation in the primary pressure is the outlet pressure P _2.

The piston pressure receiving area D ₀ of the conventional apparatus in the present invention, the lower piston area C, divided into two upper piston area D, and a D 0 _{= C} + D. Thereby, a piston outer diameter can be made small.

  The manual opening / closing operation is performed as follows. The disc 3 and disc retainer 4 are fixed by a threaded portion 2 a of the valve stem 2 and a fixing nut 5. Further, the upper piston 6 is fixed by a screw portion 2b of the valve stem 2 and a fixing nut 7, and the upper piston 6 and the stem guide 9 are fixed by a screw portion 6a. The lower piston 15 is fixed by the valve stem 2 and the nut 17. The adjustment spring 18 is compressed by the adjustment bolt 22 so that the secondary pressure becomes a set value, and an upward force is applied.

  In FIG. 1, by operating the handle 13, the fixing nut 7 is pushed down through the stem 10, the disc 3 fixed to the valve stem 2 is brought into close contact with the valve seat 1a, and the valve is closed.

In FIG. 2, when the handle 13 is turned counterclockwise from the state of FIG. 1, the screw portion 10a of the stem 10 connected to the handle 13 moves upward via the screw portion 11p of the upper cover 11, The small hole 11a provided in the upper cover 11 when the small hole 11a provided in the upper cover 11 and the small hole 10b provided in the stem 10 are aligned with each other, and the small hole 10b provided in the stem 10 fixed state by moving the inserted stem 10 by penetrating the distance H ₁ upward is shown in and.

  In FIG. 3, the force that pushes up the disc assembly in which the valve stem 2, the disc 3, the disc retainer 4, the fixing nut 5, the upper piston 6, and the lower piston 15 are integrated is working. When the function of pushing up upwards due to misadjustment of 22 or other reasons is lost, when the pin 40 is pulled out in the state of FIG. 2 and the handle 13 is turned counterclockwise, the stem 10 moves upward and the lower piston stopper 15a of the lower piston 15 is moved. Comes into contact with the upper wall 1b of the lower piston chamber and stops. This state is a state where the valve is fully opened.

  When the handle 13 is turned to the right in the state of FIG. 3, the disc assembly in which the valve stem 2, the disc 3, the disc retainer 4, the fixing nut 5, the upper piston 6, and the lower piston 15 are integrated is moved downward via the stem 10. The disk 3 comes into contact with the valve seat 1a, and the state shown in FIG. 1 is obtained.

  As described above, according to the present invention, since the piping is simplified, it is possible to obtain an advantageous effect that the construction period, the construction cost, and the material cost can be greatly reduced. In addition, since the size is reduced, the use space is also reduced. Furthermore, an advantageous effect that the appearance is clean and refined can be obtained.

It is sectional drawing of the state at the time of valve closing both a pressure reducing valve and an on-off valve. It is sectional drawing of the state at the time of valve opening of a pressure-reduction valve and an on-off valve. FIG. 5 is a cross-sectional view of a state where both the pressure reducing valve and the on-off valve are open and the on-off valve is fully opened. It is an assembly drawing of easy operability No. 1 fire hydrant. It is sectional drawing of the conventional pressure reducing valve.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Valve box 2 Valve stem 3 Disc 6 Upper piston 6d Upper piston chamber 10 Stem 11 Upper cover 13 Handle 15 Lower piston 15b Lower piston chamber 18 Pressure regulation spring 22 Adjustment bolt

Claims (3)

  A pressure reducing valve provided in a fire hose storage box, wherein the pressure reducing valve is integrally provided with a manual opening / closing valve.   2. The manual opening / closing mechanism according to claim 1, wherein the secondary pressure receiving part for pressure reduction is divided into two parts and includes a first pressure receiving part and a second pressure receiving part. Pressure reducing valve.   3. The pressure reducing valve with a manual opening / closing mechanism according to claim 2, wherein the manual opening / closing mechanism includes an opening / closing valve at an intermediate position between the first pressure receiving portion and the second pressure receiving portion.

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