JPS5822446Y2 - ball valve - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a ball valve, and particularly to a ball valve that moves a ball up and down by a small amount when opening and closing the valve, thereby facilitating the opening and closing operations of the valve.

In order to prevent powder fluid or slurry fluid from getting caught between the ball and the seat ring, or between the seat ring and the valve chamber circumferential wall and interfering with the ball opening operation, a small amount of powder or slurry fluid is raised during the ball opening operation. 2. Description of the Related Art Ball valves in which gaps are created between a ball and a seat ring and between a seat ring and a peripheral wall of a valve chamber are conventionally known.

By the way, the above-mentioned conventional ball valve, like the one disclosed in Japanese Patent Laid-Open No. 51-148825 shown in FIG. 23, this screw 23 is coupled to a threaded cylinder 24, and the threaded cylinder 24 is fixed to the valve body 25 via a required member,
When the stem 21 is operated to rotate the ball 20, the ball 20 is moved up and down by a slight amount by the action of the threaded joint.

However, in the conventional ball valve, in order to provide the vertical movement mechanism of the ball 20 in the stem 21 as described above,
The stem 21 protrudes further upwards due to its mechanism, and there are disadvantages in that the mounting location is limited.

Furthermore, since the stem 21 moves up and down when the ball 20 rotates, there is also the problem that the seal 26 around the stem 21 wears out prematurely.

On the other hand, a mechanism in which a screw guide is provided at the bottom of the valve chamber in a cock is known (see Japanese Utility Model Publication No. 3,625,253); It does not have a configuration to adjust the position.

Further, although a ball valve having an alignment structure at the bottom of the ball is known (see Japanese Patent Laid-Open No. 49-97333), it does not have a structure in which a screw guide is directly screwed to the ball.

This invention aims to solve the above-mentioned problems by separating the ball vertical movement mechanism from the stem portion and providing it on the opposite side, that is, below the valve chamber.

In order to achieve the above objective, this device inserts the upper part of the ball into the lower end of the stem so that it can move up and down, a screw guide is protruded from the bottom of the valve chamber, and the lower part of the ball is screwed into the screw guide. The basic structure is that the adjustment mechanism for the screw guide is provided on the bottom of the valve body, and the rotation of the ball causes the ball to move up and down according to the screw guide, and the adjustment mechanism adjusts the amount of protrusion of the screw guide, and therefore the ball. The position of the can be adjusted freely.

An embodiment of this invention will be described below with reference to FIGS. 1 and 2.

A gasket 2 is interposed on the body 1a to form a body cap 1.
The valve body 1 is constructed by tightening the parts b with bolts.

A valve chamber 3 formed approximately in the center of the main body 1 has a tapered top, and a ball 5 is fitted into the valve chamber 3 with seat rings 4 interposed therebetween.

At the upper part of the valve chamber 3 of the body 1a, there is a gland packing 7,
The stem 6 is rotatably inserted through the packing holders 8 and 9, and the lower end of the stem 6 is engaged with the upper part of the ball 5 with enough room to move in the vertical direction.

A handle 10 is attached to the upper end of the stem 6,
By rotating the handle 10, the ball 5 is rotated via the stem 6, and the valve is opened and closed.

On the other hand, a screw guide 11 is screwed to the opposite side of the ball 5 that engaged the stem 6, that is, to the lower part of the ball 5.
The screw guide 11 is inserted into a guide hole 12 provided at the bottom of the valve chamber 3 of the body 1a with an O-ring 13 interposed therebetween, so as to be vertically movable.

As shown in FIG. 2, notches 11a are formed on both sides of the lower part of the screw guide 11. As shown in FIG.

Further, a guide hole closing cover 14 is fixed to the valve body 1 on the lower surface of the valve chamber 3 via a gasket 15, and a portion of the cover 14 is inserted into the guide hole 12.

That is, as shown in FIG. 2, a pair of opposing retaining protrusions 14a are provided on the upper surface of the cover 14, and the notch 11a of the screw guide 11 is inserted between both protrusions 14a, and the screw guide 11 and A slight gap is provided between the screw guide 11 and the cover 14 to allow vertical movement of the screw guide 11.
A portion of the cover 14 is fitted into the guide hole 12 so that the projection 14a prevents the screw guide 11 from rotating.
is inserted into.

A through hole 16 with three diameter stages is formed in the center of the cover 14, and an adjustment bolt 17 inserted through the small diameter portion of the through hole 16 is threadably connected to the lower part of the screw guide 11. be.

The head of the adjustment bolt 17 engages with the medium diameter part of the through hole 16, and the holding ring 18 has a hole 19 in its large diameter part.
is screwed in, and this ring 18 is in contact with the head of the bolt 17.

Note that the screw connection between the ball 5 and the screw guide 11 is such that when the ball 5 is rotated from the closed direction to the open direction, the ball 5 is rotated from the closed direction to the open direction.
is configured to rise.

When the ball valve is opened from the closed state by operating the handle 10, the ball 5 moves into the screw guide 11.
Since the ball 5 does not rotate, only the ball 5 rotates and rises a little together with the seat ring 4.

Therefore, small gaps are created between the body 1a and the body cap 1b and the seat rings 4, 4, and between the ball 5 and the seat rings 4, 4, so that the valve opening operation becomes smooth.

On the other hand, when the handle 10 is operated to close the open state, the ball 5 rotates in the opposite direction and descends a little along with the seat ring 4 since the screw guide 11 does not rotate.

Therefore, the ball 5 and the seat ring 4 are tightened between the body 1a and the body cap 1b, and the body cap 1b is securely closed.

In addition, if a slight leak occurs or the opening/closing operation becomes difficult during use, rotate the adjustment bolt 17 through the hole 19 of the retaining ring 18 to move the screw guide 11 up and down. The torque can be adjusted by adjusting the degree of fit.

In addition, if the O-ring 13 is omitted and a gasket is inserted between the adjustment poles 1 to 17 and the cover 14, there is no need to use an O-ring that is sensitive to heat, so it can be applied to high-temperature fluids. It becomes a valve.

As described above, in the ball valve of this invention, the ball vertical movement mechanism, which was conventionally provided on the stem portion, is provided on the bottom of the valve chamber on the opposite side of the stem.

The space below the valve chamber is the part sandwiched between the flanges provided in the inlet/outlet passage, and was a space that had not been used effectively in the past, but the ball vertical movement mechanism of this invention protrudes into this space. Become.

Therefore, there is an advantage that the above-mentioned space can be used effectively and the amount of protrusion toward the handle side is reduced.

Further, since the stem itself does not move up and down, there is an advantage that the backing around the stem is not easily damaged.

Furthermore, since the adjustment bolt is threadedly connected to the bottom of the screw guide so that it can rotate freely but cannot move up and down, it is possible to adjust the degree to which the ball fits into the valve chamber, preventing minute leaks and preventing opening/closing operations. When the valve becomes heavy, it is possible to prevent leakage and adjust the opening/closing torque without removing the valve from the pipe.

Further, since the screw guide is threadedly connected to the ball, the torque can be adjusted by directly pushing up or pulling back the ball by vertical movement of the screw guide, making it possible to perform accurate adjustment.

[Brief explanation of drawings]

FIG. 1 is a sectional view, FIG. 2 is a partially enlarged exploded perspective view of FIG. 1, and FIG. 3 is a sectional view of a conventional example. 1... Valve body, 3... Valve chamber, 4...
...Shi) IJ ng, 5...Ball,
6... Stem, 11... Screw guide, 12... Guide hole, 14... Guide, 14a... Engaging protrusion, 16・・・・・・
Stepped through hole, 17...adjustment bolt, 18...
・Presser ring.

Claims (1)

[Scope of utility model registration request] In a ball valve in which a ball 5 is fitted into a tapered valve chamber 3 with a seat ring 4 interposed therebetween, the upper part of the ball 5 is inserted into the lower end of a stem 6 so as to be movable up and down, and the screw guide 11 is attached to the lower part of the ball 5. The guide 11 is inserted into the guide hole 12 provided at the bottom of the valve chamber 3, and a part of the guide hole closing cover 14 fixed to the valve body 1 on the lower surface of the valve chamber 3 is inserted into the guide hole 12. The engaging protrusion 14a provided at the insertion end of the guide 11 is engaged with the lower part of the guide 11 to prevent its rotation and allow vertical movement, and the stepped through hole 16 provided in the closing cover 14 is inserted into the guide 11. The adjustment bolt 17 is inserted into the hole 16, and the adjustment bolt 17 is screwed to the lower end of the guide 11, and the head of the bolt is engaged with the through hole 16, and the retaining ring 18 of the adjustment bolt 17 is inserted into the through hole 16. A ball valve characterized by being inserted and fixed.