JPH058625U - Valve guide structure for pressure reducing valve - Google Patents

Abstract

(57) [Summary] [Purpose] To ensure that the valve surface of the valve element is in close contact with the valve seat surface. [Structure] A guide hole 34 is formed in the valve body 5, and the guide hole 34 is slidably fitted into a guide rod 35. The lower end inner circumference 36 of the guide hole 34 and the upper end outer circumference 37 of the guide rod are rounded. This R
The valve body 5 is fitted at the seated position of the valve opening 30 at the processed portion. As a result, the valve body 5 has the valve opening 30.
At the seated position, it can lean in all directions and the valve face 3
2 can be brought into close contact with the valve seat surface 31.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pressure reducing valve for circulating high pressure fluid on the primary side to the secondary side so as to maintain the fluid pressure on the secondary side at a desired set pressure, and particularly to a position for closing a valve port connecting the primary side and the secondary side. The present invention relates to a structure for guiding the valve body to the.

[0002]

[Prior Art]

 A conventional pressure reducing valve is disclosed, for example, in Japanese Utility Model Laid-Open No. 61-119669. This forms an inlet connected to the primary side and an outlet connected to the secondary side in the casing, connects the inlet and outlet with a valve opening, and opens and closes the valve opening on the inlet side below the valve opening. The guide rod is formed integrally with the lower part of the valve body, and the guide rod is slidably fitted in the guide hole formed in the casing. It is elastically urged in the direction of the valve opening by the coil spring arranged at. The fluid pressure acting on the piston is controlled by opening and closing the pilot valve driven by the diaphragm, and the action of this piston and the action of the coil spring and the fluid pressure on the primary side cause the valve body to open and close the valve opening.

[0003]

[Problems to be solved by the device]

 In the above structure, the valve body may tilt and come into contact with the valve opening, and the valve surface formed on the upper surface of the valve body may not be in close contact with the valve seat surface formed on the lower end of the valve opening, and fluid may leak. This is done by precisely finishing the valve surface and valve seat surface of the valve disc so that they are exactly perpendicular to the axis of the guide rod, and by finishing the guide rod and the guide hole precisely. This can be prevented by tightly fitting the guide holes so that they can be displaced without tilting, but this is extremely difficult in reality and impossible in practice.

Therefore, the technical problem of the present invention is to set the center of the guide rod and the guide hole, and the valve surface or the valve seat surface vertically with respect to these axes, without making the tolerances of the valve surface and valve seat surface vertical. Is to ensure close contact with the valve seat surface.

[0005]

[Means for Solving the Problems]

 The technical means of the present invention taken to solve the above technical problem is to form a guide hole in a valve body that opens and closes a valve opening of a pressure reducing valve, and slide the guide hole in a guide rod formed in the casing. It is movably fitted and arranged, and the valve element is elastically biased toward the valve opening with a spring, and R processing is applied to the fitting portion of the guide rod and the guide hole at the position where the valve element abuts the valve opening. It has been given.

[0006]

[Action]

 The operation of the above technical means is as follows. The valve body is elastically urged toward the valve opening by a spring, and if there is no piston action, it abuts the valve seat surface by the action of the spring force and the fluid pressure on the primary side. When the pressure on the secondary side becomes lower than the set value, the piston is displaced and pushes down the valve element to open the valve opening. Since the guide hole formed in the valve body is fitted to the guide rod and guided so as to slide in the axial direction of the valve opening, the valve body is guided by the guide rod when pushed down by the piston. Displace in the axial direction of. When the pressure on the secondary side reaches the set value, the piston is displaced upward. The valve body is displaced by being guided by a guide rod in the direction of the valve opening by the spring and fluid pressure, and abuts on the valve opening. At this time, since the guide rod and the guide hole are fitted in the R-processed portion, even if the axis of the guide hole does not exactly coincide with the axis of the valve opening, the valve seat surface can be accurately aligned with the axis of the guide hole. Even if it is not vertical, fit it to the valve seat surface and, if necessary, incline it appropriately.

[0007]

【Example】

 An embodiment showing a concrete example of the above technical means will be described (see FIGS. 1 and 2). The casing of the pressure reducing valve consists of a spring case 2 accommodating a pressure setting spring 1, a valve case 4 in which a pilot valve 3 is arranged, a main body 6 in which a valve body 5 is arranged, and a bottom cover 7. .

A diaphragm 8 made of a thin metal plate is sandwiched between a spring case 2 and a valve case 4. The lower end of the pressure setting spring 1 is brought into contact with the upper surface of the diaphragm 8 via the diaphragm disk 9, and the upper end of the pilot valve rod 10 of the pilot valve 3 is brought into contact with the lower surface. The upper space of the diaphragm 8 is connected to the outside air via the passage 11, and the lower space is connected to the outlet 13 through the passage 12. The adjusting screw 15 is attached to the ceiling wall of the spring case 2 via the bearing 14, and the lock nut 16 is used to prevent rotation. The inner end of the adjusting screw 15 is in contact with the upper end of the pressure setting spring 1 via the ball 17 and the spring seat 18.

The pilot valve 3 is located between the passage 20 leading to the inlet 19 and the passage 22 leading to the space above the piston 21, and the pilot valve rod 10 sliding in the pilot valve seat 23 and the pilot connected to the lower end thereof. It is composed of a valve element 24 and is urged upward by a coil spring 25 from below. The piston 21 slides in a cylinder 26 attached to the inner circumference of the main body 6, and an annular groove is provided on the outer circumference to arrange a piston ring 27 and open an orifice 28 connecting the upper surface and the lower surface. An inlet 19 and an outlet 13 are formed in the body 6 and are separated by a horizontal wall. The valve seat 29 is screwed to this wall, and the inlet 19 and the outlet 13 are connected through the valve opening 30 opened therein. The lower end of the valve opening 30 is projected annularly to form a valve seat surface 31 perpendicular to the axis of the valve opening 30.

The valve body 5 is arranged below the valve opening 30. The valve body 5 has an annular groove on the upper surface of the disk portion, and forms the valve surface 32 around it. The valve surface 32 is formed perpendicular to the axis of the valve body 5. An upward protrusion 33 and a downward guide hole 34 are formed in the center of the valve body 5. The protrusion 33 and the guide hole 34 are formed perpendicular to the valve surface 32. The lower end of the piston 21 abuts on the upper end of the upward protrusion 33 and receives a downward force in the valve opening direction. A guide rod 35 is formed on the center axis of the valve opening 30 in the bottom lid 7, and the guide hole 34 of the valve body 5 is fitted therein. Therefore, the guide hole 34 slides up and down along the central axis of the valve port 30. The inner circumference 36 of the lower end of the guide hole 34 and the outer circumference 37 of the upper end of the guide rod are rounded. The R-processed portion is fitted at the position where the valve body 5 is seated on the valve opening 30. Therefore, the valve body 5 can be tilted in all directions at the position where it is seated on the valve opening 30. A coil spring 38 is interposed between a shoulder portion on the outside of the guide hole 34 of the valve body 5 and a shoulder portion formed on the guide rod 35 to elastically bias the valve body 5 toward the valve opening 30.

[0011]

[Effect of the device]

 As described above, according to the present invention, since the valve body can be tilted in all directions at the position where it is seated in the valve opening, the guide rod and the guide hole are centered, and the valve face and the valve seat face are also relative to these axes. The valve surface can be firmly attached to the valve seat surface without tightening the tolerance of vertically arranging. Therefore, the valve port can be reliably closed, and fluid leakage does not occur.

[Brief description of drawings]

FIG. 1 is a sectional view of a pressure reducing valve according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a valve body portion of FIG.

[Explanation of symbols]

 1 Pressure setting spring 3 Pilot valve 5 Valve body 8 Diaphragm 13 Outlet 15 Adjusting screw 19 Inlet 21 Piston 29 Valve seat 30 Valve opening 31 Valve seat surface 32 Valve surface 34 Guide hole 35 Guide rod 36 Lower end inner circumference 37 Guide rod Outer circumference of the coil 38 Coil spring

Claims (1)

[Claims for utility model registration] [Claim 1] A guide hole is formed in the valve body that opens and closes the valve opening of the pressure reducing valve, and the guide hole is slidably fitted to the guide rod formed in the casing. Then, the valve body is elastically urged toward the valve opening with a spring, and the valve body of the pressure reducing valve is R-processed at the fitting portion of the guide rod and the guide hole at the position where the valve body contacts the valve opening. Guide structure.