JP3182482B2 - Pressure reducing valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention cancels primary pressure,
The present invention relates to a pressure reducing valve using a secondary pressure.

[0002]

2. Description of the Related Art Conventionally, a depressurizing device provided with a spring for canceling a primary pressure by a valve body and a piston and urging the valve body in a direction against the secondary pressure, and a mechanism for increasing or decreasing the urging force of the spring. A valve has been developed (Japanese Utility Model Laid-Open No. 4-136247).

In this pressure reducing valve, the secondary pressure is received by a spring as it is, so the spool diameter (the diameter of the valve body and the piston)
The larger the size, the larger the spring required, the larger the device in terms of space, the larger the spring pressing force, the smaller the adjustable range, and the need to manually move the spool when the spool sticks. Has a problem that it requires a great deal of power and cannot be remotely controlled.

[0004]

According to the present invention, the spring chamber can be made compact with a small spring (spring) even if the diameter of the spool is large, and even if the spool sticks in a large pressure adjustment range, it can be manually moved. Is possible,
An object of the present invention is to obtain a pressure-reducing valve which is structurally simple and can be operated remotely.

[0005]

According to the present invention, a primary pressure chamber having a fluid inlet and a secondary pressure chamber having an outlet are connected to each other in a container. Communicates with the other end of the one-end closing cylinder, and supports a common sliding spindle in the cylinder and the two pressure chambers. The spindle is housed in a secondary pressure chamber and a piston in contact with the cylinder inner wall of the cylinder. A valve body is provided, and the valve body and the piston have the same primary pressure receiving area,
In the cylinder, a spring is formed on the rear side of the piston to press the piston against the pressure on the secondary side of the valve body to form a spring chamber. A pressure reducing valve, wherein an opening to the spring chamber is formed in the middle side surface to provide a fluid passage connecting the two openings, and a secondary pressure is applied to the back surface of the piston. The pressure reducing valve according to the present invention, wherein a base end of the spindle penetrates a closed portion of one end of the cylinder. The first pressure reducing valve connected to the spring chamber.
Alternatively, it is constituted by the pressure reducing valve according to the second invention.

[0006]

The [action] The present invention primary pressure P ₁ of the fluid entering from the inlet 2 to the primary pressure chamber 3, P ₁ is canceled by abutment on the opposed surface of the valve body 9 and the piston 8, the fluid valve body The secondary pressure chamber 4 enters the secondary pressure chamber 4 through the outer peripheral opening 13 of the valve 9 and urges the secondary pressure P ₂ to the back surface of the valve element 9 and the tip end surface 7 ′ of the common sliding spindle 7.

The secondary pressure P ₂ is applied to the pressure receiving area (the sum of the back surface of the valve element 9 and the tip end surface 7 ′ of the spindle 7), and at the same time, from the opening 11 ′ of the tip end 7 ′ through the fluid passage 11. 1
From 1 ", the secondary pressure fluid flows into the spring chamber 10 'and acts on the back of the piston 8.

[0008] {(sum of the front end surface 7 of the back surface and the spindle 7 of the valve body 9 ') secondary pressure P ₂ of the pressure receiving area}> force from the spindle 7 (the back area of the piston 8) is moving to FIG left Then, it moves to a position where it is balanced with the force set in the firing line 10. As a result, the flow area of the annular opening 13 is reduced and the secondary pressure P
₂ is the desired set pressure.

When the piston or the valve element is stuck, the base end of the spindle is manually operated to restore the stick.

For remote control, the spring chamber 1
By adjusting the fluid in 0 'by the fluid pressure adjusting valve 12, the pressure in the spring chamber changes, and the spindle 7 is slid forward and backward in accordance with the change to change the opening area of the outer periphery of the valve body 9. it is possible to adjust the secondary pressure P ₂ it is possible.

The adjusting valve 12 is connected to the casing 1 by a pipe 14.
Can be located far away from and remotely controlled.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Primary pressure chamber 3 having fluid inlet 2 in casing 1
And a secondary pressure chamber 4 having an outlet 5 are connected to each other. The primary pressure chamber 3 communicates with the other end of a cylinder 6 whose one end is closed, and supports a common forward / reverse slidable spindle 7 for the cylinder 6 and the pressure chambers 3 and 4.

The spindle 7 is provided with a piston 8 in contact with the inner wall of the cylinder 6 and a valve element 9 housed in the secondary side pressure chamber 4 to form a spool. The opposing primary pressure receiving surfaces are formed to have the same area, and the primary pressures P ₁ and P ₁ of the pressure water flowing from the inlet 2 are offset by reaction forces opposing each other.

The inner peripheral surface of the secondary pressure chamber 4 has an inclined surface 4 ′ whose diameter is enlarged, and a fluid passage annular opening 13 is interposed between the inner peripheral surface of the secondary pressure chamber 4 and the outer peripheral surface of the valve body 9. tip surface 7 'in the secondary pressure P ₂ acts on the back surface and the spindle 7, by the secondary pressure P ₂ spool receives a force that moves in FIG left.

This moving force is partially prevented by the force of the ridge 10 pressing the back surface of the piston 8 to the right, and from the opening 11 ′ of the tip end surface 7 ′ of the spindle 7 through the fluid passage 11 to the inside of the spindle 7. Small opening 11 "
The secondary pressure P _{2 of the} fluid flowing into and filling the spring chamber 10 ′ on the back side of the piston 8 urges the back side of the piston 8 rightward, and the moving force is generated by the spring 10 and the secondary pressure P _2. .

The secondary pressure P ₂ can be adjusted by rotating the closing portion 6 ′ at one end to change the strength of the spring, and the secondary pressure P ₂ of the filled fluid in the spring chamber 10 ′ can be adjusted. Can be adjusted by the fluid pressure adjusting valve 12 (relief valve). Thereby, the piston 8 and the valve element 9 can slide from the solid line position to the imaginary line position in FIG. 1, and the flow area of the annular opening 13 is adjusted. When remote control is performed, the pressure control valve 12 and the spring chamber 10 ′ can be connected by a pipe 14.

In FIG. 1, the proximal end 7 "of the spindle 7 is exposed to the atmosphere through one end closing portion 6 'of the cylinder 6, and is opened to the atmosphere through the atmosphere communication path 15 in FIG.
FIG. 3 shows a state in which the fluid inlet 2 of the machine box 1 is provided in the passage of the pressurized water.

The reference numeral 16 in FIG.
A pressure adjusting screw hole for connecting the
17 is a regulating valve of the pressure regulating valve 12, 18 is a pressure regulating spring,
Reference numeral 19 denotes an adjusting screw of the spline 18, and reference numeral 20 in FIG.

[0019]

According to the present invention the pressure adjustment range for construction were so the secondary pressure P ₂ spring chamber 10 obtained by reducing form power spring 10 corresponding to the 'power spring 10 is small not only be miniaturized as described above the effect of can wide and varying the opening area by adjusting only secondary pressure P _2. When the spool sticks, the proximal end 7 "of the spindle 7 can be manually moved and repaired. The fluid pressure in the spring chamber 10 'can be adjusted by remote control.

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view showing a pressure reducing valve of the present invention.

FIG. 2 is a front view of FIG. 1 as viewed from the right.

FIG. 3 is a vertical sectional side view showing a state where a pressure reducing valve is provided in a water channel.

FIG. 4 is a front view of FIG. 3 as viewed from the right.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Machine case 2 Fluid inlet 3 Primary side pressure chamber 4 Secondary side pressure chamber 5 Outlet 6 One end closed cylinder 6 'One end closed part 7 Common sliding spindle 7' Tip face 7 "Base end part 8 Piston 9 Valve body 10 Forming 10 'Spring chamber 11 Fluid passage 11', 11 "Opening 12 Fluid pressure regulating valve

Continuation of the front page (72) Inventor Toshiaki Matsumoto 1302, Kamiyamada, Hubei-cho, Higashi-Asai-gun, Shiga Prefecture (56) References JP-A 4-136247 (JP, U) JP-A 4-36614 (JP, U) Sho Akai 55-117015 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G05D 16/00-16/20

Claims (3)

(57) [Claims] A first pressure chamber having a fluid inlet and a second pressure chamber having an outlet are connected to a machine box, and the other end of a closed cylinder is connected to the primary pressure chamber. A common sliding spindle is supported by the two pressure chambers, and the spindle is provided with a piston in contact with a cylinder inner wall of the cylinder, and a valve housed in a secondary side pressure chamber. In the cylinder, a spring which presses the piston against the secondary pressure of the valve body is provided on the back side of the piston to form a spring chamber. An opening to the secondary pressure portion is formed at the tip end surface of the piston, and an opening to the spring chamber is formed in the middle side surface to provide a fluid passage connecting both openings, and a secondary side is provided at the back of the piston. A pressure reducing valve characterized by energizing pressure. 2. The pressure reducing valve according to claim 1, wherein a base end portion of the spindle penetrates a closing portion of one end of the cylinder. 3. The pressure reducing valve according to claim 1, wherein a fluid pressure adjusting valve is connected to the spring chamber.