JPS6233172Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a ball valve, and more specifically, the present invention relates to a ball valve, and more specifically, by rotating a valve stem integrated with the valve body by 90 degrees, the valve body is pulled up and opened. The present invention also relates to a structure for preventing the seat ring from getting caught in a ball valve, which is configured to lower the valve body and bring it into a fully closed state by rotating the valve stem 90 degrees in the opposite direction.

[Conventional technology]

This type of ball valve is, for example,
As disclosed in Publication No. 148825, since the valve body is opened and closed while being raised and lowered, a pair of seat rings are fitted between the valve body and the valve chamber, and this seat ring allows the valve to be closed when fully closed. It is necessary to ensure liquid tightness. However, in conventional ball valves, the seat ring is fitted so that it can move in any direction, up, down, left or right, so the seat ring tends to shift as the valve body rotates. was. When the seat ring moves out of its normal position, it gets caught in the gap between the valve body and the surface of the valve chamber, causing an abnormally large torque to be generated on the valve stem, a phenomenon known as jamming. It was hot.

The present invention attempts to solve such problems.

[Means for solving problems]

In order to solve the above problems, the present invention provides an inlet side opening 5 and an outlet side opening 6 in the valve chamber 2 provided in the body 1, which communicate with the inlet side passage 3 and the outlet side passage 4, respectively. Valve chamber 2 with openings 5 and 6 formed
are formed into inclined surfaces 7 and 8 that approach each other as they reach the bottom of the valve chamber 2, and an inlet side is formed between the spherical valve body 9 housed in the valve chamber 2 and the inclined surface 7 around the inlet side opening 5. A seat ring 15 is interposed, an outlet side seat ring 16 is interposed between the valve body 9 and the inclined surface 8 around the outlet opening 6, and the valve body 9 is rotated by 90 degrees of the valve stem 10. In a ball valve equipped with a rotary elevating mechanism 17 that opens and closes while elevating and lowering the valve body 9, an inlet seat ring 15 is attached to the side wall 13 of the valve chamber 2 facing the valve hole outlet 12b when the valve body 9 is closed.
An adjustment bolt 26 is screwed into the side wall 14 of the valve chamber 2, which faces the valve hole inlet 12a when the valve body 9 is closed, and which faces the outlet side seat ring 16. , and an adjustment bolt 26'a which abuts on the outer peripheral surface thereof is screwed into the adjustment bolt 26'a.

[Effect]

When the valve body 9 in the closed state is opened by rotating the valve stem 10 by 90 degrees, the gap between the valve body 9 and each inclined surface 7, 8 of the valve chamber 2 gradually increases as the valve body 9 rises. The seat rings 15 and 16 tend to move out of place, but the seat rings 15 and 16 are attached to the side walls 13,
Adjustment bolts 26, 2 screwed in from 14, respectively
Since its outer peripheral surface is supported by 6'a, displacement movement is prevented.

Note that when rotating the valve body 9 in the closing direction, the inside of the valve chamber 2 becomes narrower as the valve body 9 reaches the bottom of the valve chamber 2 due to the inclination of the inclined surfaces 7 and 8. , 16 are more stable than in the open case. Therefore, means for preventing displacement in the closing rotation direction is not necessarily required.

〔Example〕

Hereinafter, the present invention will be explained in detail based on the accompanying drawings.

As shown in FIGS. 1 and 2, the ball valve according to the present invention includes a valve chamber 2 provided in a body 1, an inlet opening 5 communicating with an inlet passage 3 and an outlet passage 4 of the body 1, and an outlet. Side openings 6 are provided, and the surfaces of the valve chamber 2 including the openings 5 and 6 are formed into inclined surfaces 7 and 8 that tend to approach each other as they reach the bottom of the valve chamber. A spherical valve body 9 is housed in the valve chamber 2, and
A valve stem 10 connected to the valve body 9 passes through a bonnet 11 that closes the upper open portion of the valve chamber 2 in a fluid-tight manner. When the valve hole 12 provided in the valve body 9 is open, the valve hole inlet 12a faces the inlet side opening 5 of the valve chamber 2, and the valve hole outlet 12b faces the outlet side opening 6 (see Fig. 2). . Further, when the valve body 9 is in the closed state, the valve hole inlet 12a is connected to one side wall 14 of the valve chamber 2.
Furthermore, the valve hole outlet 12b is arranged to face the other side wall 13 (see FIG. 3).

Also, each of the inclined surfaces 7 and 8 around each of the openings 5 and 6
Metal seat rings 15 and 16 are interposed between the valve body 9 and the valve body 9, respectively. seat ring 15,
The outer surface of the valve body 16 is formed flat along the inclined surfaces 7 and 8, and the inner surface is formed into a concave curved surface that conforms to the spherical surface of the valve body 9.

Further, a male thread 18 is formed at the upper end of the valve stem 10, an adjustment nut 19 is screwed to the male thread 18, the adjustment nut 19 is screwed into a screw hole of a bearing part 20 that is integrated with the bonnet 11, and the set bolt 21 A rotating lifting mechanism 17 is constructed by rotating the detent. Since the rotary elevating mechanism 17 is configured as described above, when the handle (not shown) attached to the upper end of the valve stem 10 is rotated 90 degrees in either direction, the valve body 9 rises or falls while rotating. , opens and closes the valve hole 12. In the state shown in FIGS. 1 and 2, the valve hole 12 is fully opened, and from this state, the rotary lifting mechanism 17 is operated to lower the valve body 9 to close it as shown in FIG. 3.

In the figure, 22 is a gasket, 23 is a gasket, and 24 is a gasket holder.

The parts of the structure explained above are publicly known before the application, as shown in Japanese Patent Application Laid-Open No. 148825/1989, which is a patent application filed by the same person as the inventor of the present application. As mentioned above, seat ring 1
It has the drawback of easily causing the phenomenon of biting.

Therefore, in the present invention, the seat ring 15,
This drawback has been solved by adopting 16 rotation prevention means.

That is, as shown in FIGS. 2 and 3, each chamber 2
A screw hole 25 facing the outer peripheral surface of the inlet seat ring 15 is provided in one side wall 13 along the flow direction.
and threaded holes 25' facing each other are provided on the outer peripheral surface of the exit side seat ring 16, respectively. Further, the other side wall 14 has a screw hole 25a facing the outer peripheral surface of the inlet side seat ring 15 on the opposite side and a screw hole 25' facing the outer peripheral surface of the outlet side seat ring 16 on the opposite side. Provide each a.

In addition, each of these screw holes 25, 25', 25
Adjustment bolts 26, 26' on a and 25'a, respectively.
26a and 26'a are screwed in, and their tip positions are adjusted so that they come into contact with the outer peripheral surfaces of the opposing seat rings 15 and 16 from both ends. A locking screw 27 for loosening and a taper threaded plug 28 for sealing are screwed into each of these adjusting bolts 26, 26', 26a, 26'a, respectively.

In the case shown, adjustment bolts 26 and 26a are provided on both sides of the inlet seat ring 15, and adjustment screws 26' and 26a are provided on both sides of the exit seat ring 16, respectively.
6'a is screwed in, so that the force of the displacement movement acting on each seat ring 15, 16 is received when the seat ring is operated in either the opening or closing direction.

In this case, when opening the valve body 9 by turning it 90 degrees in the direction of the arrow in FIG.
5 and 16, and the gap between the valve body 9 and the inclined surfaces 7 and 8 of the valve chamber 2 gradually becomes larger. Therefore,
The seat rings 15 and 16 tend to shift and move, and the valve body 9
However, in the case of the present invention, the force of displacement acting on the seat rings 15 and 16 is absorbed by the two adjusting bolts located symmetrically with respect to the valve stem 10. 26, 26'a, and the jamming phenomenon is effectively prevented.

On the other hand, when closing the valve body 9 by turning it 90 degrees in the direction of the arrow in FIG. Each seat ring 15, 16 is relatively stable and there is little risk of jamming. For this reason, 2 at another symmetrical position centering on the valve body 10
The main adjustment bolts 26', 26a may be omitted.

In the end, in the present invention, the above-mentioned adjustment bolt 2
6,26'a are essential. In this case, as shown in FIG. 3, one adjustment bolt 26 is connected to the outer peripheral surface of the inlet side seat ring 15 in the side wall 13 of the valve chamber 2, where the valve hole outlet 12b faces the valve hole outlet 12b when each valve body 9 is closed. The other adjustment bolt 26'a is screwed into the opposite position, and the other adjustment bolt 26'a is
When the valve body 9 is closed, the valve hole inlet 12a is screwed into the side wall 14 of the valve chamber 2 at a position facing the outer peripheral surface of the outlet side seat ring 16.

[Effect of idea]

As described above, the present invention includes at least two adjusting bolts 26, 26'a, one of which is such that, as shown in FIG. The other adjustment bolt 26'a is screwed into the side wall 13 of the valve chamber 2 at a position facing the outer peripheral surface of the inlet side seat ring 15 and comes into contact with the outer peripheral surface of the seat ring 15. It is screwed into a position facing the outer peripheral surface of the outlet side seat ring 16 in the side wall 14 of the valve chamber 2 facing the valve hole inlet 12a, so as to come into contact with the outer peripheral surface of the seat ring 16. Therefore, when the valve body 9 is opened, the seat rings 15 and 16 are prevented from shifting in the opening rotation direction, and the phenomenon of the seat rings 15 and 16 being caught can be effectively prevented.

Further, by operating each adjustment bolt 26, 26'a, the position relative to the seat ring 15, 16 can be adjusted individually for each ball valve.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the valve body in its open state, and Figure 2 is a cross-sectional view of the valve body in its open state.
FIG. 3 is a sectional view taken along the line A-A in the figure, and FIG. 3 is a sectional view when the valve body of FIG. 2 is closed. DESCRIPTION OF SYMBOLS 1...Body, 2...Valve chamber, 3...Inlet side passage, 4...Outlet side passage, 5...Inlet side opening, 6...
...Exit side opening, 9... Valve body, 10... Valve stem, 12
...Valve hole, 12a... Valve hole inlet, 12b... Valve hole outlet, 13, 14... Side wall, 15, 16... Seat ring, 25, 25', 25a, 25'a... Screw hole, 26 , 26', 26a, 26'a...Adjustment bolt.

Claims (1)

[Scope of utility model registration request] A valve chamber 2 provided in a body 1 is provided with an inlet opening 5 and an outlet opening 6 that communicate with an inlet passage 3 and an outlet passage 4, respectively. An inlet seat ring 15 is formed on inclined surfaces 7 and 8 that approach each other toward the bottom of the valve chamber 2, and is located between the spherical valve body 9 housed in the valve chamber 2 and the inclined surface 7 around the inlet opening 5. An outlet seat ring 16 is interposed between the valve body 9 and the inclined surface 8 around the outlet opening 6, and the valve body 9 is raised and lowered by rotating the valve stem 10 by 90 degrees. In a ball valve equipped with a rotary lifting mechanism 17 that opens and closes the valve body 9, when the valve body 9 is closed, the valve hole outlet 12b is placed on the side wall 13 of the valve chamber 2 facing the inlet side seat ring 15 and on its outer periphery. The adjustment bolt 26 that contacts the surface is screwed into the side wall 14 of the valve chamber 2, which the valve hole inlet 12a faces when the valve body 9 is closed.
A ball valve characterized by having an adjustment bolt 26'a screwed therein which faces the outlet side seat ring 16 and comes into contact with its outer peripheral surface.