JPH0236833B2 - SHIBENTSUKIBATAFURAIBEN - Google Patents

Description

[Detailed Description of the Invention] (1) Field of Industrial Application This invention relates to a butterfly valve with a slave valve, more specifically, a butterfly valve with a small valve opening formed in the outer periphery of a main valve body, and a small valve that opens and closes the small valve opening. This invention relates to a butterfly valve with a child valve in which pressure loss can be minimized by providing a valve body rotatable within a small valve port.

(2) Prior Art An example of this type of butterfly valve with child valve is disclosed in Japanese Patent Publication No. 11533/1983. As shown in FIG. 4, in this valve, a master valve shaft 103 is rotatably supported by bearings 102 and 102' provided in a valve body 101. A master valve body 105 that opens and closes the flow path 104 by rotating the master valve shaft 103 is fixed. A small valve port 107 is bored in the center of the main valve body 105, and a child valve body 108 for opening and closing the small valve port is provided in the small valve port 107, and a child valve shaft is inserted into the main valve shaft 103. 110.

(3) Problems to be Solved by the Invention Incidentally, in the butterfly valve with a child valve as described above, the child valve body 108 is disposed within the small valve port 107 provided at the center of the main valve body 105. , and the child valve shaft 110 is coaxial with the parent valve shaft 103,
Due to the structure in which the main valve shaft 103 is inserted into the main valve shaft, the shaft diameter of the main valve shaft 103 and the thickness of the main valve body 105 fixed to the main valve shaft inevitably become large. Therefore, the opening area of the flow path 104 in the fully open state where the parent valve body 105 opens the flow path 104 becomes small, and the flow path 1
There was a problem in that the pressure loss of the fluid passing through 04 became large.

Therefore, the technical object of the present invention is to reduce the pressure loss as described above as much as possible.

(4) Means for solving the problems In order to solve the above-mentioned problems, the butterfly valve with slave valve according to the present invention is characterized by adopting the following technical means. In other words, a master valve shaft is rotatably supported by a bearing provided in a valve box, and a flow path is opened and closed by rotating the master valve shaft inside the valve box. A small valve port is cut out on the outer periphery of the main valve body that intersects with the main valve shaft, and when the main valve is fully closed, the child valve shaft is supported by a bearing provided in the valve box facing the small valve port. A flat plate-shaped element that is rotatably supported on a shaft, and that fits water-tightly into the small valve port inside the small valve port of the child valve shaft, and opens and closes the small valve port by rotating the child valve shaft. The valve body was fixed.

(5) Operation This valve is operated as follows. To open the valve in the fully closed state where the master valve closes the flow path and the child valve closes the small valve port, first rotate the child valve shaft and rotate the flat child valve approximately 90 degrees. to open the small valve port.
Thereafter, the master valve shaft is rotated to rotate the master valve body approximately 90 degrees to open the flow path. This results in a fully open state. On the other hand, to close the valve from the fully open state, first rotate the master valve shaft in the opposite direction, rotate the master valve body approximately 90 degrees in the opposite direction,
Close the flow path. Thereafter, the child valve shaft is rotated in the opposite direction, and the child valve body is rotated approximately 90 degrees in the reverse direction, thereby closing the small valve port.
This results in a fully closed state. In this way, when the main valve element opens and closes the flow path, the child valve element opens the small valve port, so the upstream and downstream sides of the main valve element are almost uniform, and the load torque applied to the main valve shaft is extremely small. becomes smaller.

In addition, as is clear from the above structure, the child valve shaft is not provided coaxially with the main valve shaft, but is provided separately. There is no need to increase the size, and therefore, the opening area of the flow path in the fully open state can be increased, making it possible to reduce pressure loss as much as possible.

(6) Unique Effects As mentioned above, since the master valve shaft and the child valve shaft are not provided coaxially, there is no risk of such operation occurring during driving. In addition, in the conventional type, the main valve shaft and the child valve shaft are coaxial, that is, the child valve shaft is inserted into the main valve shaft, so that the flow path can be seen from the fitting gap between both valve shafts. Fluid may enter the drive side, causing the drive device to rust and become inoperable, but with this valve, this never happens and smooth operation can be maintained over a long period of time.

(7) Embodiment In FIGS. 1 to 3, reference numeral 1 denotes a butterfly valve with a child valve, which is provided with a valve body 3 having a cylindrical flow path 2.
Bearing parts 5 integrally provided at the upper and lower parts of the valve box 3,
5', a master valve shaft 6 for the master valve body is rotatably supported, and a master valve body 7 for opening and closing the flow path 2 is fixed by a pin 8 to the inner part of the valve box of this master valve shaft 6. has been done.
An upper end portion of the master valve shaft 6 protruding from the bearing portion 5 is connected via a bonnet 10 to an output shaft (not shown) of a worm reducer 11 fixed to the bearing portion 5 of the valve box 3. This output shaft is connected to a handle 12 on the worm shaft via a worm wheel and worm (not shown). Therefore, when the handle 12 is rotated, the output shaft and the master valve shaft 6 are rotated, and the master valve body 7 opens and closes the liquid path 2. In the bearing parts 5 and 5', 13 and 14 are bushings, 15 and 16 are packings, and 17 is packing 15.
The presser foot 18 is a cover.

A small valve port 20 is cut out in the outer peripheral portion of one side of the master valve body 7 perpendicular to the master valve shaft 6 . A bearing portion 21 is integrally provided in the valve box 3 that faces the small valve port 20 in the fully closed state. A child valve shaft 25 for a child valve body is held in the bearing part 21 by a flange part 23 provided at an intermediate part in the longitudinal direction between the bearing and a packing box 22 fixed to the bearing part. It projects from the small valve port 20 and is rotatably supported. A child valve body 26 that fits in the small valve port 20 in a watertight manner is fixed to one end of the child valve shaft 25 by a pin 27 so that the small valve port 20 can be opened and closed. An operating lever 28 is connected to the key 2 at the other end of the child valve shaft 25 protruding from the gasket box 22.
It is fixed via 9. Therefore, when the operating lever 28 is rotated, the child valve shaft 25 rotates, and the child valve body 26 opens and closes the small valve port 20. 3
1 is a lock bolt for locking the operating lever 28; the lock bolt 31 penetrates and engages an arc-shaped through hole 33 formed in a substantially sector-shaped lock member 32 protruding from the packing box 22; A wing nut 34 is screwed together, and by tightening the wing nut 34, the operating lever 28 and the lock member 3 are connected.
2 can be compressed to lock the child valve body 26 at a predetermined opening degree. 36 is Butsuyu, 37,
38 is a thrust ring, 40 and 41 are Patsukin,
42 is a presser foot for the packing 41. Further, 44 is a rubber lining that covers the inner circumferential surface of the flow path 2 of the valve box 3, and 45 is a rubber lining that covers the outer circumferential surface of the main valve body 7 including the small valve port 20. These rubber linings 44, 45 It also serves as a valve seat.

It should be noted that what has been shown above is one of the preferred and more specific embodiments, and the detailed design including the shapes of the small valve port 20 and the child valve body 26 can be changed as desired. .

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional front view showing an embodiment of the invention;
2 is a cross-sectional plan view taken along the - line in FIG. 1, FIG. 3 is a side view taken along the - line in FIG. 1, and FIG. 4 is a vertical cross-sectional side view showing a conventional example. 1...Butterfly valve with child valve, 2...Flow path, 3...
... Valve box, 5, 5', 21... Bearing portion, 6... Main valve shaft, 7... Main valve body, 20... Small valve port, 25... Child valve stem, 26... Child valve body.

Claims (1)

[Claims] 1. A master valve body that rotatably supports a master valve shaft with a bearing provided in the valve box, and opens and closes a flow path by rotating the master valve shaft inside the valve box. fixed,
A small valve port is cut out in the outer periphery of the main valve that intersects with the main valve shaft, and when the main valve is fully closed, the child valve shaft can be freely rotated by a bearing provided in the valve box facing the small valve port. Support,
A flat plate-shaped child valve body is fixed to the inside part of the small valve port of this child valve stem, which fits in the small valve port in a watertight manner and opens and closes the small valve port by rotating the child valve stem. Butterfly valve with child valve.