JPH0662269U - Valve body structure in butterfly type water control valve - Google Patents

Abstract

(57) [Summary] [Purpose] In a butterfly-type water control valve, it is an object of the present invention to obtain a reliable sealed state by bringing the valve body and the valve seat into a particularly elastic contact. [Structure] A butterfly type water control valve in which a circular valve body 1 having a valve shaft as a center is rotatable with respect to a valve box A, and a convex valve seat 2 protruding annularly is provided on the inner surface of the valve box. And one annular stepped portion 8 and 8 ′ is formed on the outer peripheral edge of the valve body 1.
The annular elastic element 4 is fitted into the annular stepped portion 8 of the above, and the annular metal piece 3 is slidably fitted into the annular stepped portion 8 further, and the holding plate 7 is fitted and engaged with the second annular stepped portion 8 '. When the valve is closed, the metal piece 3 on the valve body side, which is in contact with the convex valve seat 2 in the above-mentioned valve box, presses the elastic element 4 of the valve body, which is interposed in the inner depth 9 of the annular stepped portion 8, The structure is designed to increase the pressure and maintain a high degree of watertightness between the valve body and the valve seat.

Description

[Detailed Description of the Invention] [Industrial application] The present invention relates to a valve body structure for a butterfly-type water control valve, and more particularly to a butterfly type of a type capable of elastically contacting the valve body with a valve seat to achieve a reliable seal. This is related to the shape control valve.

[Conventional technology]

 Generally, a butterfly-type water control valve is used in which the valve body is integrated and the valve seat is integrated with the valve box.When the butterfly-type water control valve is opened and closed, the sliding contact parts of the valve body and valve seat wear. This is the cause of water leakage.

 Therefore, as for a water control valve which requires some precision, a valve seat is made to be an elastic valve seat to prevent water leakage by its restoring force. There is a publication. This is because a concave groove is formed on the inner peripheral surface of the valve box corresponding to the circular seat surface of the valve body, and an elastic valve seat that is pressed into close contact with the bottom surface of the groove inside the concave groove is fitted, and the seat of that valve body is seated. A U-shaped valve seat that can come into contact with the surface is attached to the elastic valve seat so that it can be pushed back and forth in the valve body direction.

[Problems to be solved by the invention]

 However, in order to replace the valve seat due to wear of the valve seat, the valve box itself affects the replacement work of the valve seat, and its maintenance is a problem.

 Therefore, it is a technical object of the present invention to solve the watertightness problem when providing a member for advancing and retracting toward the valve body and providing the advancing and retracting member for a valve body having no thickness caused by the method.

[Means for solving problems]

 Therefore, in order to solve the above technical problem, the following configuration is adopted. That is, a convex valve seat 2 that projects annularly is formed on the inner surface of the valve box A, and the metal piece 3 that is in contact with the convex valve seat 2 is pressed by the elastic element 4 and the valve body 1 and the metal piece 3 are pressed. 3 and 3 are fitted in the annular recess 9 so as to maintain the watertightness thereof.

[Action]

 When the valve body 1 of the butterfly type water control valve is rotated in the valve closing direction, the slidable metal piece 3 comes into contact with the convex valve seat 2 on the inner surface of the valve box A at the tip of the valve body 1 to complete the valve closing. By the time, the metal piece 3 moves against the elastic element 4 in the direction of crushing the elastic element 4. Therefore, the elastic element is crushed in the annular recess 9 of the valve body 1 to stop the water leaking from between the valve body 1 and the metal piece 3, and the watertight problem is solved even in the case of a valve body having no thickness. The metal piece 3 is elastically pressed against the convex valve seat 2 to complete the seal between the valve body and the valve seat.

〔Example〕

 Next, an embodiment will be described with reference to FIGS. As shown in FIG. 1, the butterfly type water control valve is provided with an operation box body C above a valve box A, and is connected to a valve shaft B which is constituted by appropriate gear means and a handle and extends into the valve body. ing. The valve shaft B is eccentrically mounted on the valve body 1 of the butterfly valve.

 An annular convex valve seat 2 is integrally formed on the inner peripheral surface of the valve box A, and is formed thicker as it extends in the valve seat closing direction of the valve body 1.

 The valve body 1 is disc-shaped, and two annular step portions 8 and 8 ′ are formed on the outer peripheral portion of the valve element 1, and an elastic element 4 having an annular shape is fitted into the first annular step portion 8. Then, the metal piece 3 having an annular shape is integrally fitted, and the pressing plate 7 is fitted into the second annular stepped portion 8 '. An annular projection 6 is integrally mounted on the pressing plate 7 substantially at the center thereof. When the pressing plate 7 is fixed to the valve body 1 with a tightening screw 10, the projection 6 is inserted into the annular recess 9. Overhang and strike elastic element 4.

 In the butterfly-type water control valve configured as described above, the metal piece 3 rides on the convex valve seat 2 when the valve is closed, and then the metal piece 3 is formed by the convex valve seat 2 which gradually becomes thicker until the valve closing is completed. Are pressed into the annular recess 9. Therefore, the elastic element fitted on the upper portion of the metal piece 3 is compressed and seals between the valve body 1 and the metal piece 3. Further, as described above, since the projection 6 is mounted on the pressing plate 7 at a position facing the elastic element 4 at the center thereof, the elastic element 4 pressed by the upward movement of the metal piece 3 is crushed vertically. When it is opened, it expands in the lateral direction and effectively presses and contacts the protrusion 6, so that the watertightness between the valve body 1 and the holding plate 7 becomes more complete.

 Here, in the embodiment, the metal piece 3 may be a combination of semi-annular metal pieces, a combination of a plurality of metal pieces, or the like. When the butterfly valve is completely closed, the metal pieces shrink inward. It gets close to the watertight state. Furthermore, the integrally formed annular metal piece 3 is pushed into the inside by the elastic force of the metal.

 In particular, in the embodiment, the elastic element 4 is currently preferably rubber or synthetic resin.

[Effect of device]

 The present invention has the above-described structure, and when the valve body 1 of the butterfly type water control valve is rotated in the closing direction, the convex valve seat 2 on the inner surface of the valve box A is slidable at the tip of the valve body 1. The metal piece 3 comes into contact with it, and the metal piece 3 moves in the direction of crushing the elastic element 4 against the elastic element 4 until the valve closing is completed. Therefore, the elastic element is crushed in the annular recess of the valve body 1 to stop the water leaking from between the valve body 1 and the metal piece 3 and to solve the watertight problem even in the case of a valve body having no thickness. The metal piece 3 is elastically pressed against the convex valve seat 2 to complete the seal between the valve body and the valve seat. Furthermore, since an elastic seal is attached to the valve body 1, only the valve body can be removed and the elastic seal of the valve body 1, in other words, the metal piece 3 and the elastic element 4 can be replaced or repaired, improving maintenance. To do.

[Brief description of drawings]

The drawing shows an embodiment of the present invention, FIG. 1 is a front view of a butterfly type water control valve, and FIG. 2 is a partial sectional view taken along the line II-II of FIG. A ... Valve box, 1 ... Valve body, 2 ... Convex valve seat,
3 ... metal piece, 4 ... elastic element.

Claims (1)

[Scope of utility model registration request] In a butterfly-type water control valve in which a valve body is rotatably mounted on a valve box around a valve shaft pivotally supported by a circular valve body, a convex valve seat protruding annularly is formed on the inner surface of the valve box. And a metal piece that is in contact with the convex valve seat is pressed by an elastic element and is fitted in an annular recess so as to maintain watertightness of both the valve body and the metal piece. And valve body structure.