JPH112358A - Operating cap for direct buried valve - Google Patents

Abstract

(57) [Problem] To provide a simple structure of an operation cap for rotating a valve stem of a directly buried valve, and to surely prevent earth and sand from entering a rotating part. SOLUTION: A retainer retainer 40 is provided around a valve rod 34 at an upper end of a valve box 31, and a cap portion inserted into an upper opening 43 of the retainer retainer 40 and fastened to an upper end of the valve rod 34. 45, a stopper projection 60 provided at a portion of the cap portion 45 inserted into the upper opening 43 of the retainer retainer 40, a recess 62 provided on the retainer retainer 40 to accommodate the stopper projection 60, Engagement projection 63 provided on retainer retainer 40 and engaged with stopper projection 60 when cap portion 45 is rotated for operation of valve rod 34.
And

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an operating cap for a directly buried valve.

[0002]

2. Description of the Related Art Generally, a directly buried valve buried directly in the ground has an operation cap for rotating a valve stem. The operation cap needs to have a structure that prevents water, earth and sand from entering the inside. Further, it is necessary that the rotating portion does not have a large protrusion or the like that receives resistance such as earth and sand.

FIG. 7 shows an example of a conventional operation cap for a directly buried valve. Here, reference numeral 1 denotes a valve box, in which a valve body (not shown) is accommodated. Reference numeral 2 denotes a valve stem for operating the valve element, which penetrates the upper end of the valve box 1 upward. A retainer 3 for an O-ring for sealing is provided between the valve stem 2 and the valve box 1 at a portion where the valve stem 2 penetrates. Reference numeral 4 denotes a C-shaped retaining ring, which is attached to the valve stem 2 to position the valve stem 2 and the retainer 3 relative to each other. An annular ground cover 5 is attached to an upper end of the valve box 1, and an inner flange 6 is formed at an upper end of the ground cover 5.

[0004] A cap 7 is arranged inside the ground cover 5. The cap 7 is fitted over an upper end 9 having a flat portion 8 of the valve stem 2 so that the valve stem 2 and the valve stem 2 are connected to each other. It can rotate integrally. The cap 7 has an outer flange 10 associated with the inner flange 6 of the ground cover 5.
This prevents the cap 7 from coming off the ground cover 5. An O-ring 11 for sealing is mounted on the outer periphery of the cap 7 and is pressed against the inner periphery of the inner flange 6 of the ground cover 5. At the upper end of the cap 7 at a portion protruding from the ground cover 5, a prism portion 16 is formed for fitting an operation tool for rotating the cap 7.

[0005] A gap 12 is formed between the cap 7 fitted in the upper end 9 of the valve stem 2 and the upper end surface of the valve box 1. The cap 7 is integrally formed with a projection 13 projecting downward toward the gap 12.
Further, a spring pin 14 with which the projection 13 can engage when the cap 7 rotates is driven into the upper end of the valve box 1.

Accordingly, the cap 7 and the valve stem 2 can be integrally rotated in the circumferential direction until the projection 13 hits the spring pin 14. Generally, in a directly buried valve, it is sufficient that the valve body, that is, the valve stem 2 is rotated in a range of 90 degrees for opening and closing. Therefore, the projection 13 is formed so as to form a sector within a range of approximately 270 degrees when viewed in the axial direction, and the range from the one end face and the other end face in the circumferential direction of the sector 13 to the spring pin 14. With valve stem 2
Is made rotatable, it is possible to secure the above-mentioned 90-degree rotation range. An indication plate 15 for indicating the rotation angle of the valve shaft 2 is attached to the upper surface of the ground cover 5. The cap 7 is provided with an index (not shown) for pointing the indicating plate 15.

According to such a configuration, the cap 7 is covered with the ground cover 5, and the cap 7 is
Since the space between the cab 7 and the cap 7 is sealed by the O-ring 11, intrusion of earth and sand into the cab 7 can be prevented. In addition, since the rotating protrusion 13 is also present inside the ground cover 5, the protrusion 13 can be prevented from receiving the resistance of earth and sand.

FIGS. 8 and 9 show another example of a conventional operation cap for a directly buried valve. In this example, an annular packing 17 is provided between the outer periphery of the valve stem 2 and the inner periphery of the valve box 1, and an annular packing retainer 18 fitted to the valve stem 2 is provided with a plurality of bolts 19 in the circumferential direction. To the upper end of the valve box 1. A recess 20 is formed at the upper end of the packing retainer 18, and an opening indicating plate 21 is accommodated in the recess 20. The opening degree indicating plate 21 is attached to the valve stem 2 and is rotatable integrally with the valve stem 2 above the bolt 19. The recess 20 has a pair of stoppers 22, 22 for restricting the rotation range of the valve stem 2 by contacting the opening indicator plate 21 when the valve stem 2 and the opening indicator plate 21 rotate integrally. Is formed by the head of a bolt 24 screwed into the packing retainer 18 via the spacer 23. These pair of stoppers 22, 2
2 are provided at positions 180 degrees apart from each other in the circumferential direction, and the shape of the opening degree indicating plate 21 is determined so that the rotation range α of the valve shaft 2 becomes approximately 90 degrees correspondingly. Reference numeral 25 denotes a plate formed of a resin such as vinyl chloride and configured to cover at least the rotation range of the opening degree indicating plate 21.

According to such a configuration, the opening degree indicating plate 21
Is covered with the plate 25, it is possible to prevent earth and sand from entering a portion where the opening degree indicating plate 21 rotates, and to prevent the opening degree indicating plate 21 from receiving the resistance of the earth and sand during rotation.

[0010]

However, in the conventional structure shown in FIG. 7, a gap 12 is provided between the cap 7 fitted to the upper end 9 of the valve stem 2 and the upper end face of the valve box 1. Therefore, there is a problem that wobbling is likely to occur during the rotation operation of the cap 7, and the seal by the O-ring 11 is easily damaged. Also spring pin 1
Since it is necessary to provide the indicator 4 and the indicator 15, there is a problem that the number of parts increases and the structure becomes complicated.

On the other hand, in the other conventional constructions shown in FIGS. 8 and 9, the opening degree indicating plate 21 is covered with the plate 25, but it is not enough, and fine earth and sand infiltrate, making it difficult to perform the rotation operation. There is a problem that it is easy to become.

SUMMARY OF THE INVENTION It is an object of the present invention to solve such a problem and to reduce the number of parts, to have a simple structure, and to reliably prevent earth and sand from entering the rotating part.

[0013]

According to the present invention, an operating cap for rotating a valve stem of a directly buried valve is provided at an upper end of a valve box around a valve stem. A cap portion inserted into the upper opening of the annular portion and fastened to the upper end of the valve stem; and a stopper projection provided at a portion of the cap portion inserted into the upper opening of the annular portion. A concave portion provided on the annular portion to accommodate the stopper projection; and a stopper provided on the annular portion when the cap portion is rotated for operation of the valve stem. It has an engaging projection that engages.

With such a configuration, the stopper projection and the engagement projection for regulating the rotation range of the valve stem are provided on the cap portion and the annular portion, respectively, so that the total number of parts is small. , Its structure is simplified.
Also, since the cap is fastened to the upper end of the valve stem,
Wobble is less likely to occur, and therefore, when sealing is performed with an O-ring or the like, the sealing performance can be reliably maintained.

[0015]

FIG. 6 shows an example of a directly buried valve to which the operation cap of the present invention can be applied. Here, 31 is a valve box, 32 is a seat portion, 33 is a valve body, and 34 is a valve stem.
At the upper end of the valve stem 34, an operation cap 35 according to the present invention for rotating the valve stem 34 from the ground surface side is provided.

As shown in detail in FIG. 1, the valve stem 34 is disposed so as to penetrate the upper end of the valve box 31 upward. A ring-shaped retainer 36 is provided between the outer periphery of the valve stem 34 and the inner periphery of the valve box 31 at the penetrating portion of the valve stem 34, and a gap between the outer periphery of the retainer 36 and the inner periphery of the valve box 31 is provided. An O-ring 37 is provided. An O-ring 38 is also provided between the outer periphery of the valve stem 34 and the inner periphery of the retainer 36. An annular retainer retainer 40 as an annular portion is provided at an upper end of the valve box 31, and the retainer retainer 40 is fixed to an upper end of the valve box 31 by a bolt 41.
The retainer 36 can be pressed to a predetermined position. The space between the retainer retainer 40 and the upper end surface of the valve box 31 is sealed by an O-ring 42.

An upward circular opening 43 is formed at the center of the upper part of the retainer retainer 40. 44 is an opening 43
Is a cylindrical part around the periphery. A cap portion 45 is inserted into the opening 43 from above. The cap portion 45 has a concave portion 47 that can fit into the prism portion 46 at the upper end of the valve stem 34, and is provided with a hexagon socket head cap screw 49 that is passed through a bolt hole 48 formed through the center thereof. It is fastened to the upper end of the valve stem 34. The head 50 of the bolt 49 is buried inside the prism 51 at the upper end of the cap 45. The prism 51 is used to engage an appropriate operating tool for rotating the valve stem 34.

As shown in FIGS. 1 and 2, the cap portion 45 has a flange portion 53 corresponding to the cylindrical portion 44 at a position above the retainer retainer 40. On the upper surface of the flange portion 53, an indicating portion 54 for indicating the opening degree of the valve is formed by being integrally cast with the metal cap portion 45. It is sufficient that the pointing portion 54 slightly protrudes from the flange portion 53, and therefore, when the cap portion 45 is rotated, substantially no resistance is received from earth and sand. Outwardly open tapered surfaces 55 and 56 facing each other are formed on the lower outer peripheral edge of the flange portion 53 and the upper outer peripheral edge of the cylindrical portion 44 of the retainer retainer 40, respectively. A dust seal 57 using an O-ring is externally fitted to the tapered surfaces 55 and 56 facing each other. An O-ring 58 for sealing is provided between the outer periphery of a portion of the cap 45 inserted into the opening 43 of the retainer retainer 40 and the inner periphery of the retainer retainer 40.

FIG. 3 shows the bottom of the cap portion 45 upside down. As shown in FIGS. 1 and 3, the concave portion 47 of the columnar cap portion 45 is formed in the form of a two-sided groove extending in the radial direction. The projection 60 is formed by integral casting. Reference numeral 61 denotes a groove for accommodating the O-ring 58.

As shown in FIGS. 1, 4 and 5, the metal retainer retainer 40 has a concave portion 62 for accommodating the stopper projection 60 of the cap portion 45 over a predetermined range in the circumferential direction. Is formed. In addition, this depression 6
In the circumferential portion where no 2 is formed, the engagement protrusion 63 is formed by integral casting with the retainer retainer 40 on the inner periphery of the opening 43. This engagement protrusion 6
3 regulates the rotation range of the cap portion 45, that is, the valve stem 34, by engaging with the stopper projection 60 of the cap portion 45 fastened to the valve stem 34 by the bolt 49. In the illustrated example, the shapes and dimensions of the stopper projections 60 and the engagement projections 63 are defined so that the rotation range is approximately 90 degrees.

With such a configuration, the stopper projection 60, the depression 62, and the engagement projection 63 are located inside the opening 43 of the retainer retainer 40, that is, the retainer retainer 4.
Although provided in a space surrounded by the O and the cap portion 45, since this space is sealed by the O-ring 58, the inflow of earth and sand is reliably prevented. In addition, since the cap portion 45 is fastened to the valve stem 34 by the bolt 49, the cap portion 45 does not shake, so that the sealing by the O-ring 58 can be ensured. Further, in addition to the O-ring 58, a dust seal 57
Is provided and a double seal is applied, so that the inflow of earth and sand into the inside of the cap portion 45 is more reliably prevented.

Further, as described above, since the opening indicating portion 54 can be formed by casting with a low height, when the cap portion 45 is rotated, the surrounding earth and sand acts as a resistance to hinder the rotation. There is an advantage that it can be prevented from becoming.

Further, since the stopper projection 60 is formed integrally with the cap 45, and the engagement projection 63 is formed integrally with the retainer retainer 40, that is, the cap 45 and the retainer retainer 40 are formed integrally. Since the stopper 40 itself has a stopper function, the number of parts is reduced, the structure is simplified, and there is also an advantage that it is inexpensive.

[0024]

As described above, according to the present invention, the stopper projection provided at the portion of the cap portion inserted into the upper opening of the annular portion, and the stopper projection provided at the annular portion are housed. And the engaging projection provided on the annular portion and engaged with the stopper projection when the cap is rotated for operation of the valve stem. Since the stopper projection and the engagement projection for regulating the rotation range of are provided on the cap portion and the annular portion, respectively, the total number of parts can be reduced, and the structure can be simplified, Also, since the cap portion is fastened to the upper end of the valve stem, wobbling does not easily occur. Therefore, when sealing is performed with an O-ring or the like, it is necessary to reliably maintain the sealing performance. It can be.

[Brief description of the drawings]

FIG. 1 is a sectional view of an operation cap for a directly embedded valve according to an embodiment of the present invention.

FIG. 2 is a plan view of the operation cap of FIG. 1;

FIG. 3 is a perspective view showing the bottom of the cap in FIG. 1 with the top and bottom reversed.

FIG. 4 is a partially cutaway perspective view of a retainer retainer in FIG. 1;

FIG. 5 is a plan view of the retainer retainer of FIG.

FIG. 6 is a cross-sectional view illustrating a directly embedded valve to which the operation cap of the present invention is applied.

FIG. 7 is a sectional view of a conventional operation cap for a directly embedded valve.

FIG. 8 is a cross-sectional view of another conventional operation cap for a directly embedded valve.

FIG. 9 is a sectional view taken along line IX-IX in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 31 Valve box 34 Valve stem 40 Retainer presser 43 Opening 45 Cap part 60 Stopper projection 62 Depression part 63 Engagement projection

Claims (1)

[Claims] 1. An operation cap for rotating a valve stem of a directly buried valve, the annular cap being provided at the upper end of a valve box around the valve stem, and inserted into an upper opening of the annular portion. And a cap portion fastened to the upper end of the valve stem, a stopper projection provided at a portion of the cap portion inserted into an upper opening of the annular portion, and a stopper projection provided at the annular portion. A concave portion for accommodating the stopper portion, and an engaging projection provided on the annular portion and engaged with the stopper projection when the cap portion is rotated for operating the valve stem. Operation cap for a directly buried valve.