JPH04125366A - Eccentric valve - Google Patents

Abstract

PURPOSE:To obtain a useful life almost twice as much as that of the conventional one by removably fitting a sleeve with an outer peripheral center axis passing through the center to a valve box, providing flanges corresponding to the upper and lower surfaces of a valve box on the outer peripheral surface of the released sleeve, and removably screwing a bracket mounted over both the flanges. CONSTITUTION:Center axes of valve boxes 11 and 12 are eccentric from a center axis O of the peripheries of sleeves 13A and 13B, and are respectively crossed at right angles to a passage axial line Fx at a position Os1 (in the state that a valve body-valve seat 8 can be engaged with a first valve box-valve seat 5), or a position Os2 (in the state that the valve body valve seat 8 can be engaged with a second valve box valve seat 6). Since a center axis Ob of the valve box-valve seat surface is apart from a valve box center axis Os by a distance of Ls in the direction of Fy rectangular to a Fx line, an equation of Ev=Ls is obtained. In the above equation, 180 deg. rotation of the valve body in the valve box requires a condition of the shortest distance between the center axis O of the outer periphery of the sleeve and the valve box-valve seat surface being larger the longest distance between the center axis of the outer periphery of the sleeve and the valve box-valve seat surface, and consequently, a relationship of Eb>Ev is brought about, and thus an equation of Lb=EXsin beta is added.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is an eccentric valve, that is, a valve body whose central axis is eccentrically fixed to a rotatable valve shaft and whose central axis is an arcuate valve body valve seat surface. This relates to an eccentric valve that is fully closed when it coincides with the central axis of the valve.

[Prior Art] As shown in FIGS. 8 to 10, the basic form of eccentric valves conventionally used is that the valve body has an arc-shaped valve seat surface 54 that rotates with the rotation of the valve shaft 52. Since the center axis Ova is eccentric by Eva with respect to the center axis Osa of the valve stem, as the valve stem rotates, the center axis of the valve seat surface also moves and rotates as a whole, rotating approximately 90 degrees. to open and close.

When this type of valve is placed in the fully closed position, the central axis Ova of the valve body valve seat surface moves, resulting in the central axis of the arc-shaped valve body valve seat surface 55 provided on the downstream side of the valve body. 0vea
At this point, both arcs overlap and the valve seat surface becomes in a rich state.

In this way, the valve body and the valve seat surface of the valve body are in complete contact with each other only when the valve is closed, and until then, due to eccentricity, the range in which they slide in close contact with each other is extremely small. This reduces wear on the valve seat and load torque, and improves the sealing function.Compared to other types of valves, the slurry is suitable for use in polluted waterways where solid foreign matter is mixed, reducing the chance of foreign matter getting caught. It has an established reputation as being able to withstand long-term use.

[Problems to be Solved by the Invention] As mentioned above, eccentric valves are characterized by a small sliding range between the valve seat surfaces of the valve body and the valve body. When fluid flows from beginning to end, that is, when the valve is open, the valve seat surface of the valve body is approximately parallel to the axis of the flow path and located at one corner of the upper or lower part of the valve body, so there is less risk of being adversely affected by contaminated fluid. Although the target is small, the valve seat surface of the valve body faces the flow head-on, and slurry and solid foreign matter in the polluted liquid collide with each other, accelerating wear and damage and causing loss of adhesion between the valve seat surfaces. There is a risk that functionality may be affected.

For this reason, even though the valve seat surface of the valve body is still intact,
There are frequent cases in which valves must be replaced due to wear and deterioration of the valve seat surface of the valve box, creating a major issue in the maintenance of pipelines.

In order to solve the above-mentioned problems, the present invention aims to provide a novel eccentric valve that can recover from functional deterioration of the valve due to wear and tear on the valve body and valve seat, and can almost double its service life.

[Means for Solving the Problems] The eccentric valve according to the present invention has a streamline axis of the valve as Fx, and Fx
When Fy is an axis perpendicular to the center point O, an arc-shaped valve centered on the center axis Ob eccentric from the center point Q by an amount Es on Fx with respect to the front and rear of the flow path with the center point O as the point of symmetry. The box valve seat surfaces are arranged opposite each other, making it possible to release the Sinobe whose outer peripheral center axis passes through the center point O to the top and bottom surfaces of the valve box.
The inner circumferential surface of the sleeve fits inside the sleeve so as to be able to restrain the valve shaft centered at a point Es eccentric on a line diagonally intersecting Fx with an angle β between 90° and 0°. The central axis Ob of the valve body valve seat surface encounters the central axis trajectory of the valve body valve seat surface, which moves in an arc of radius Ev centered on the central axis Os of the valve shaft, and the valve shaft central axis Os is at the center. Eb in the Fx direction with respect to point O,
Ls eccentricity in Fy direction, Ev=Ls and Ls=EsS! The above problem was solved by establishing nβ.

Note that more specific embodiments will be discussed later.

[Function 1 Figure 1 shows an embodiment of the present invention, where the streamline axis of the valve is Fx
, the axis perpendicular to the center point 0 is Fy.

A third valve seat valve seat surface 5 in an arc shape symmetrically about the center point O on the downstream side and upstream side of the valve body 1. The second valve box valve seat surfaces 6 are provided opposite each other, and the centers of the curvature radii of both arcs are Ob, which is equidistant (Eb) away from the center point O toward the upstream and downstream sides.
l, located in Ob2. Sleeves 138, 1 are placed above and below the valve box 1.
3B respectively, and the feature is that the sleeve is fixed integrally with the valve body, but if desired, it is freed from the restriction to the valve body and can freely rotate.

The center of the inner circumferential surface of the sleeve is eccentric, and drive and support valve shafts 11 and 12, each having a central axis on a line forming an angle β between 90° and Oo with Fx, are fitted therein, or A feature of this is that the sleeve and each valve shaft are restrained so as not to rotate when desired, and are constructed so that they can rotate together as one unit.

3 and 4 are horizontal cross-sectional views and explanatory views thereof showing the normal valve opening/closing operation of this embodiment, in which Fy is perpendicular to the axis Fx of the flow path at the center point O. The central axis Ob1 of the valve seat surface of the valve box is separated by Eb from the center point O. The valve box center axis Os, which is added to Ob2 and lies on the line that intersects Fx at angle β,
The central axis Ov of the valve seat surface of the valve element moves in an arc of radius Ev centered on +052, and the curved surfaces of both overlap in a state that coincides with Ob, resulting in the valve being closed (solid line in FIG. 3).

The structural features of the present invention enable the following unique effects.

In other words, when the valve function has deteriorated mainly due to wear on the valve seat surface of the valve box and it has been determined that the valve is no longer usable,
A second valve box valve seat surface 6 is used in place of the conventionally used first valve seat valve seat surface 5.

As shown in the two-dot chain line in Figure 3, the valve body is 90 degrees from closed (solid line).
The procedure for changing the use from the rotated open state to the new valve seat valve seat surface (left side in the figure) will be explained based on FIGS. 5 to 7.

(1) As shown in Figure 5, in this state (dotted lines), release the restraint between the sleeves 13A, 13B and the valve body 1 so that the sleeves can freely rotate within the valve body, and also and so that they rotate together as one.

(2) When the valve stem 11 is rotated by 180 degrees, the sleeve also rotates within the valve body along with the valve stem, and comes to the position indicated by the dotted line in FIG.

(3) Re-install the sleeves 13A and 13B into the valve box 1 at this position.
This releases the restraint between the sleeve and the valve box.

(4) The valve body is in the open state as shown by the two-dot chain line in Figure 7,
When the valve body is roughly rotated 90' clockwise, the valve seat surface of the valve body comes into close contact with the second valve body valve seat surface (left side) 6, as shown by the solid line in the figure, and a new valve closing engagement relationship is established.

[Example] The details of the example will be described below to avoid duplication with the description in the previous section.

In Figures 1 to 3, 1 is a valve box in which a valve body storage chamber 4 is provided between an inlet 2 and an outlet 3, and the downstream side of the valve body storage chamber 4 (
On the outflow port 3 side) there is an arc-shaped first valve box valve seat 5. An arc-shaped second valve box valve seat 6 is provided on the upstream side (inflow port 2 side). Reference numeral 7 designates a valve body which has a lens-shaped cross section and is coated with rubber or the like on its outer surface, and whose valve seat surface 8 is in the shape of an arc and engages with the aforementioned valve box floor surface 5.6. The driving valve shaft 11° is fixed to the supporting valve shaft 12.

13A and 13B are sleeves that are indirectly or directly fitted and fixed to the valve body 1, respectively, and these sleeves 13A and 13
The inner peripheral members 16A and 16s of B are the driving valve shafts 11, respectively.
and supporting valve shaft 12, the center axis of the valve shaft 11i2 is eccentric from the center axis 0 of the outer periphery of the sleeves 13A, 13B by Es, and the valve body valve seat 8 engages with the first valve body valve seat 5. When possible, Os1. When the valve body valve seat 8 is in a state where it can engage with the second valve body valve seat 6, the valve body valve seat 8 is perpendicular to the flow path axis Fx at the position of OS 2.

In this embodiment, the central axis Ob of the valve seat surface of the valve box is the central axis O of the valve box.
Since it is perpendicular to Fy force direction Ls at a distance from the Fx line with respect to s, the relationship Ev=Ls holds true.

In addition, in order for the valve body to rotate 180° within the valve body, the shortest distance from the center axis O of the sleeve outer circumference to the valve body valve seat surface must be longer than the longest distance from the center axis of the sleeve outer circumference to the valve body valve seat surface. The requirement is that s<Es is large, and the condition is that L
b=Essin (3 relationship is added.

Sleeve 13A is an example of release between the sleeve and the valve body.
, 13B are provided with flanges 14A and 14s@ that match the upper and lower surfaces 158 and 15B of the valve box, and a bracket 21 that straddles both.
8. Fix or release 21B with fixing bolts 24A, 24B.

Note that even in the released state, the sleeve is only rotatable within the valve box and does not come off from the valve box due to the action of the restraining bolts 2OA and 20B.

An example of restraint between the sleeve and the valve stem is the above-mentioned bracket 21.
Screw fixing bolts 22A and 22B that can move forward and backward into A and 21B, and insert engagement holes 23A and 22B into corresponding positions of valve shafts 11 and 12, respectively.
23B is recessed, and the tip of the fixing bolt is fitted and locked into this hole to restrain it from rotating together. Others 17A,
17B, 18A, 18B are backing, 19A, 19s
is the backing foot.

[Effects of the Invention] The eccentric valve according to the present invention has a service life that is almost twice as long as that of conventional eccentric valves when used in pipes containing solid materials, slurry, and other polluted liquids that are prone to abrasion and abrasion. effective.

In particular, regarding the valve seat surface of the valve box, which is considered a weak point under wear conditions, since the essence of an eccentric valve is a combination of special eccentric conditions, it is simply a matter of the two valve seat surfaces of the valve box facing on the upstream and downstream sides. The valve structure cannot be formed just by placing them oppositely, and the valve body must be removed from the valve body and assembled to form the oppositely eccentric state, which naturally requires tedious manual labor and time. They have to accept the unbearable sacrifice of water cutoff.

Here, there was a problem in using the eccentric valve in normal and reverse directions, but the present invention overcomes this problem and can easily reverse eccentricity and restore the function without water outage.

This effect can be said to be a point that leads to priority evaluation in terms of conduit maintenance.

Another secondary issue is that when an eccentric valve is used horizontally (valve shaft is horizontal) in a polluted water pipeline, if the valve body is on the bottom side in the vertical direction when fully open, the valve seat surface of the valve body There is a risk of solid foreign matter getting caught between the inner circumferential wall of the box and damaging the valve seat surface of the valve body, or making it impossible to open and close the valve, but this invention is free from design errors, installation work errors, etc. Even if the valve body is on the bottom side due to this, there is also the effect that it can be easily changed to the entry side.

[Brief explanation of drawings]

Fig. 1 is a front longitudinal cross-sectional view of an embodiment of the present invention, Fig. 2 is a side view of the same, Fig. 3 is a plan cross-sectional view of the same, Fig. 4 is an explanatory diagram of the main parts of Fig. 3, and Fig. 5-7 The figures are action explanatory diagrams of the embodiment of the present invention (5.6 is a plan view, and Fig. 7 is a plan sectional view), Fig. 8 is a front vertical sectional view of the conventional example, Fig. 2 is a side view of the same, and Fig. Figure 3 is a sectional view of the same plane. 1... Valve box, 5... First valve box valve seat surface 6
...Second valve box valve seat surface, 7...Valve body 8.
... Valve body valve seat surface, 11 ... Drive valve shaft 1
2...Supporting valve stem, 13A, 13B...
・Sleeve 14A, 143...Tsuba, 15A・
...Top surface of valve box, 153...Bottom surface of valve box, 2
1A, 213... Bracket 22A, 22B.
...Fixing bolts 23A, 23s...Engagement hole O...Central axis of sleeve outer periphery, center point Os,
+ OS 2... Central axis of the valve shaft Ob+, Ob2
... Central axis Ov of the valve seat surface of the valve body ... Central axis Fx of the valve seat surface of the valve body ... Flow path axis

Claims (3)

[Claims] (1) In an eccentric valve that is fully closed when the central axis of the valve seat surface of the circular valve body eccentrically fixed to the rotatable valve stem coincides with the central axis of the valve seat surface of the circular valve body, the valve flow When the linear axis is Fx, and the axis perpendicular to Fx at the center point O is Fy, the center axis Ob is eccentric from the center point O by Es on Fx with respect to the front and rear of the flow path, with the center point O as the point of symmetry. The valve seat surfaces of the valve box having an arc shape as the center are arranged opposite each other, and a sleeve whose outer circumferential central axis passes through the center point O is releasably fitted to the valve box, and the inner circumferential surface of the sleeve is at an angle of 90° to Fx. A circular arc with a radius Ev centered on the central axis Os of the valve shaft is fitted inside the valve shaft centered on a point Es eccentric on a line that intersects diagonally with an angle β between 0° and can be restrained. The central axis Ob of the valve body valve seat surface encounters the central axis locus of the valve body valve seat surface, which moves with a stroke of An eccentric valve characterized in that Ev=Ls and Ls=Essinβ hold true. (2) In claim (1), the release of the sleeve is characterized in that a collar is provided on the outer peripheral surface of the sleeve that matches the upper and lower surfaces of the valve box, and a bracket that spans both is removably screwed into the valve box. Eccentric valve. (3) In claim (2), the valve stem is restrained by attaching a fixing bolt to the bracket at right angles to the valve stem so that it can move forward and backward, and on the other hand, an engagement hole is formed at a corresponding position on the valve stem. Eccentric valve.