JP2555485Y2 - Valve body guide structure of pressure reducing valve - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure reducing valve for flowing a high pressure fluid on a primary side to a secondary side so as to maintain a fluid pressure on a secondary side at a desired set pressure, and in particular, connects the primary side and the secondary side. The present invention relates to a structure for guiding a valve body to a position for closing a valve port to be closed.

[0002]

2. Description of the Related Art A conventional pressure reducing valve is disclosed in, for example,
No. 19669. This is a valve that forms an inlet connected to the primary side and an outlet connected to the secondary side in the casing, connects the inlet and the outlet with a valve port, and opens and closes the valve port on the lower inlet side of the valve port. A guide rod is integrally formed at the lower part of the valve body, and the guide rod is slidably fitted in the guide hole formed in the casing, and the valve body is placed outside the guide hole. Is elastically urged in the direction of the valve port by the coil spring. The fluid pressure acting on the piston is controlled by the opening and closing of the pilot valve driven by the diaphragm, and the valve body opens and closes the valve port by the action of the piston and the action of the coil spring and the fluid pressure on the primary side.

[0003]

In the above arrangement, the valve body is inclined and abuts on the valve port, and the valve surface formed on the upper surface of the valve body cannot be in close contact with the valve seat surface formed on the lower end of the valve port. Fluid may leak. This means that the valve surface and valve seat surface of the valve body are precisely finished to be exactly perpendicular to the axis of the guide rod, and
Precisely finishing the guide rod and the guide hole can be prevented by tightly fitting the guide rod so that the guide rod is displaced without tilting on the same axis, but in practice it is extremely difficult and practical Is impossible.

Accordingly, a technical problem of the present invention is to provide a valve seat without centering the guide rod and the guide hole and arranging the valve face and the valve seat face perpendicularly to these axes. 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 that a guide hole is formed in a valve body for opening and closing a valve port of a pressure reducing valve, and the guide hole is formed in a casing. The guide hole is slidably fitted to the guide rod, and the valve body is elastically urged in the valve opening direction by a spring.
The part where the R processing was performed, the R processing was performed on the outer periphery of one end of the guide rod, and the R processing of the guide hole was performed at the position where the valve element was in contact with the valve port
It is characterized by the fact that the part of the guide rod that has undergone R processing is fitted
It is assumed that .

[0006]

The operation of the above technical means is as follows.
The valve body is elastically urged in the valve opening direction by a spring, and if there is no action of the piston, the valve body contacts the valve seat surface by the action of the spring and the fluid pressure on the primary side. If the pressure on the secondary side becomes lower than the set value, the piston is displaced, pushing down the valve body and opening the valve port. Since the guide hole formed in the valve element is guided to fit in the guide rod and slide in the axial direction of the valve port, when the piston is pushed down, the valve element is guided by the guide rod and the valve port is guided. 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 the spring and fluid pressure in the direction of the valve port, guided by the guide rod, and comes into contact with the valve port. At this time, since the guide rod and the guide hole are fitted at the rounded portion, even if the axis of the guide hole does not exactly coincide with the axis of the valve port, the valve seat surface can be accurately aligned with the axis of the guide hole. Even if it is not vertical, if necessary, it may be properly inclined and adhered to the valve seat surface.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment showing a specific example of the above technical means will be described (see FIGS. 1 and 2). The casing of the pressure reducing valve comprises 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 element 5 is arranged, and a bottom cover 7.

A diaphragm 8 made of a thin metal plate is disposed between the spring case 2 and the 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 outside air through a passage 11, and the lower space is connected to an outlet 13 through a passage 12. An adjusting screw 15 is attached to the ceiling wall of the spring case 2 via a bearing 14.
And lock it with the lock nut 16. The inner end of the adjusting screw 15 contacts the upper end of the pressure setting spring 1 via a ball 17 and a spring sheet 18.

The pilot valve 3 is connected to the passage 2 leading to the inlet 19.
0 and a passage 22 communicating with the space above the piston 21. The pilot valve rod 10 slides in a pilot valve seat 23 and a pilot valve body 24 connected to the lower end thereof. It is biased upward. The piston 21 slides in a cylinder 26 attached to the inner periphery of the main body 6 to provide an annular groove on the outer periphery, arrange the piston ring 27, and open the orifice 28 connecting the upper surface and the lower surface. An inlet 19 and an outlet 13 are formed in the main body 6 and are separated by a horizontal wall. A valve seat 29 is screwed to this wall, and an inlet 19 and an outlet 13 are passed through a valve port 30 opened in the valve seat 29.
Concatenate. The lower end of the valve port 30 is protruded annularly to form a valve seat surface 31 perpendicular to the axis of the valve port 30.

The valve body 5 is disposed below the valve port 30. The valve body 5 has an annular groove on the upper surface of the disc portion,
Form 2 The valve face 32 is formed perpendicular to the axis of the valve body 5. An upward projection 33 and a downward guide hole 34 are formed in the center of the valve body 5. The projection 33 and the guide hole 34
It is formed perpendicular to 2. The upper end of the upward projection 33 contacts the lower end of the piston 21 and receives a downward force in the valve opening direction. A guide rod 35 is formed on the bottom cover 7 on the central axis of the valve port 30, and the guide hole 34 of the valve element 5 is fitted. Therefore, the guide hole 3
4 slides up and down along the central axis of the valve port 30. Lower end (open end) inner circumference 36 of guide hole 34 and upper end (one end) of guide rod
The outer periphery 37 is rounded. The R-processed portion is fitted at a position where the valve element 5 is seated on the valve port 30. Therefore, the valve element 5 can be inclined in all directions at the position seated on the valve port 30. A coil spring 38 is interposed between the shoulder outside the guide hole 34 of the valve body 5 and the shoulder formed on the guide rod 35 to elastically urge the valve body 5 toward the valve port 30.

[0011]

According to the present invention as described above, the valve body can be inclined in all directions at the position where the valve body is seated at the valve port, so that the guide rod and the guide hole are centered, and the valve is disposed with respect to these shafts. The valve surface can be securely adhered to the valve seat surface without having to tighten the tolerance of vertically arranging the surface and the valve seat surface. Therefore, the valve port can be reliably closed, and no fluid leakage occurs.

[Brief description of the 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 cross-sectional view of a valve body portion of FIG.

[Explanation of symbols]

 DESCRIPTION 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 port 31 Valve seat surface 32 Valve surface 34 Guide hole 35 Guide rod 36 Lower end inner circumference of guide hole 37 Guide rod Top coil outer circumference 38 Coil spring

Claims (1)

(57) [Scope of request for utility model registration] 1. A guide hole is formed in a valve body for opening and closing a valve port of a pressure reducing valve, and the guide hole is slidably fitted on a guide rod formed in a casing, and the valve body is moved in the valve port direction by a spring. Elastically urged to the inner periphery of the opening end of the guide hole,
Of the guide hole at the position where the valve body abuts the valve port and the guide rod at the position where the guide hole has been rounded.
A valve body guiding structure for a pressure reducing valve, wherein the valve body guide structure is fitted with a bent portion .