JPH01312278A - Ball valve - Google Patents

Abstract

PURPOSE:To compress a sub-valve plate to a flow outlet and to ensure tight closing so as to prevent generation of leakage by disposing, at a valve closing face side, a sub-valve plate so as to freely come into contact with or be released from a flow outlet. CONSTITUTION:A spherical valve body 2 is arranged in a valve box 1 having flow ports 11, 11 so as to move freely. Valve seat bodies 3 are inserted in the outlets. A flow passage 21 penetrates through the body 2, while at a face side for closing the ports 11, sub-valve plates 4, 4 are arranged in a free force- contact or release manner with respect to the ports 11, 11. At a valve shaft 22 fixed to the body 22, a control rod 24 is mounted, while on a central shaft, a control shaft 62 is provided to move vertically freely. To a control shaft 62, a rod cam 6 is connected through a lateral rod 64. It is thus possible to compares the sub-valve body 4 against the valve seat body 3, upon valve closing operation, when the cam 6 is moved downward by the shaft 62 after the valve body 2 is turned to a valve closing position.

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to a ball valve comprising a valve box having a flow port and a spherical valve body rotatably housed within the valve box. [Prior Art] Generally, this type of ball valve has an O-ring provided on the valve seat surface formed at the inner end of the valve box of the flow port, and the O-ring is brought into pressure contact with the spherical valve body to maintain its sealed state. It is configured as follows.

[Problem to be solved by the invention]

However, the above-described O-ring has a problem in that it has poor heat resistance, pressure resistance, and chemical resistance, and is subject to restrictions on the location and fluid in which it can be used. Therefore, it is conceivable to use a so-called metal touch method in which the valve seat surface is brought into direct pressure contact with the spherical valve element. However, in such a structure, when the flow port is opened or closed by rotating the spherical valve element, the valve A new problem arises in that the body may become stuck to the valve seat surface. Incidentally, it is possible to prevent the valve body from seizing by lightly pressing the valve seat surface against the spherical valve body, but in this case, sealing cannot be ensured and fluid leakage may occur. Become. The object of the present invention is to provide a ball valve that can completely eliminate these problems. [Means for Solving the Problem] In order to achieve the above object, the ball valve of the present invention has the following features:
A spherical valve body having a flow path that can communicate with the flow port is installed inside a valve box having a flow port, and the flow port of the valve box is opened and closed by rotation of the valve body. In the ball pulp, an auxiliary valve plate is arranged on the closing surface side of the valve body that closes the flow port so as to be able to move toward and away from the outlet, and by pressurizing the back side of the auxiliary valve plate, the outlet is closed. (11) is configured to be temporarily closed by a sub-valve. [Operation] After rotating the spherical valve body so that its closing surface side faces the flow port of the valve box, a pressing force is applied to the back surface of the temporary sub-valve disposed on the closing surface side. This sub-valve plate is pushed forward and comes into pressure contact with the flow port, thereby closing the flow port. Next, when the pressing force acting on the back side of the auxiliary valve plate is released, the auxiliary valve plate is no longer pressed against the flow port, and the spherical valve body is rotated to connect the flow path to the flow port of the valve box. By doing so, the flow port is opened. In this way, when the spherical valve element is rotated, the outer peripheral surface of the valve element and the sub-valve plate should not come into strong sliding contact with the flow port of the valve body (since opening and closing are performed, the spherical valve element and the sub-valve plate should not be brought into strong sliding contact). Seizing of the valve plate does not occur. [Example] To explain the embodiment of the present invention with reference to the drawings, Figs. 1 to 3 show the first embodiment of the present invention, and (1) shows the valve chamber. A valve box with (1a) in the center and having flow ports (II) (II) facing each other on the same center line on both sides thereof,
A spherical valve body (2) is installed in the valve chamber (1a) of this valve box (1).
It is arranged so that it can rotate freely. Further, at the outlet (+1) C11) of the valve body (1), there is a cylindrical metal valve seat body (3) (3) having a valve seat surface (31) (31) formed on the opposing inner end surface. is inserted and screwed, and on the other hand, the spherical valve body (2) has a flow port (II) of
) is penetrated by a flow path (21) that can communicate with the flow path (21), and a metal plate is provided on the surface perpendicular to the flow path (21), that is, the surface that closes the flow ports (II) (If). A sub-valve plate (4) (4) is disposed so as to be able to press against and separate from the flow port (IO(ll)), and when the spherical valve body (2) is in the closed position, the sub-valve plate (4) (4) from the back side, the valve seat surface (31) of the valve seat body (3) (3)
) (31) and the outer circumferential surface of the sub-valve plate (4) (4) is brought into pressure contact with the flow port (II) (II) to maintain the airtight state. The spherical valve body (2) is rotatably housed in the valve chamber (1a), and has an upper valve shaft (22) formed in the shape of a hollow cylinder and a solid short shaft in the center of its upper and lower end surfaces. Shaft-shaped lower valve shafts (23) are respectively protruded on the same vertical line,
Further, the upper valve shaft (22) is rotatably supported through a through hole 02) provided in the center of the upper surface of the valve case (1) and protrudes to the outside. (2
3) is rotatably supported at the center of the inner surface of the lid plate 03) forming the bottom wall of the valve chamber (1a). (5) The upper valve shaft (22
), and as shown in Figure 3, a part of its peripheral wall is cut out (51) within an angular range of about 90 degrees, and the cutout (51) forms a cylindrical body. One end surface (52) controls the closed position of the valve body (2), and the other end surface (53) controls the open position. (24) is a valve body operating rod whose tip is integrally fixed at a proper position on the circumferential wall of the protruding end of the upper valve shaft (22), and extends horizontally from inside the notch (51) of the cylinder body (5) to the outside. The spherical valve body (2) can be rotated within the notch range of the cylindrical body (5) by operating the valve body operating rod (24). ) when the sub-valve plate (4) disposed on the spherical valve body (2) comes into contact with one end surface (52) of the spherical valve body (2).
) is in the closed position facing the flow port (3) (3), and when it comes into contact with the other end surface (53), the flow path (21) of the spherical valve body (2) closes to the flow port (3) (3) This is the release position that communicates with the In addition, the structure in which the sub-valve plate (4) can be freely moved in and out of the spherical valve body (2) can be done through a guide bin, etc.; ) distribution port (
Circular recess (25) on the side that closes +1 (111)
(25), and the auxiliary valve plates (4) (4) are slidably fitted into the recesses (25) (25), and a small diameter circular Guide hole (2
6) (26) and this guide hole (26) (2
A short cylindrical guide tube (41) (41) protruding from the back surface of the sub-valve plate (4) (4) is slidably fitted into the valve plate (6). In FIGS. 1 and 2, the pressing mechanism for pushing the sub-valve plates (4) (4) from the back side is as follows:
) (4) The vertical rod cam (6) is installed so as to be slidable up and down on the vertical smooth surface of the valve body (2) facing the center of the back surface of the valve body (2).
) (6) is performed by the vertical movement. This rod cam (6) has a semicircular cross section, and its arcuate side slides against the valve body (2) to reduce frictional resistance between the two and enable smooth vertical movement. A cam protrusion (61) that can collide with a protrusion (42) protruding from the center of the back surface of the auxiliary valve plate (4) is provided at the center of the flat surface side opposite to the center of the back surface of the plate (4). By moving the rod cam (6) downward and bringing the lower end inclined surface of the cam protrusion (61) and the upper end inclined surface of the protruding portion 42 of the sub valve plate (4) into sliding contact with each other, the sub valve plate (4) to the distribution port (11) (I
t) in the direction of closing, while moving the rod cam (6) upward to move the cam protrusion (61) into the protrusion (
42) so that the sub-valve plate (4) can be retracted. The vertical movement mechanism of the rod cam (6) is, for example, an operating shaft (62) threaded through the hollow part of the upper valve shaft (22), and a horizontal rod (64) attached to the lower end of the operating shaft (62). Slin l-(27) whose central part is relatively rotatably connected and both ends of the horizontal rod (64) are formed into the upper valve shaft (22).
(27), and the upper end of the rod cam (6) (6) is integrally fixed to the protruding end thereof, and the upper end of the operating shaft (62) protrudes from the upper valve shaft (22). A handle rod (63) is attached to the part. To explain the operation of the ball valve in the embodiment configured in this way, the valve body operating rod (24) is in contact with one notch end surface (52) of the cylindrical body (5), that is, the spherical valve body (
The flow ports (11) (1) are connected by the sub valve plates (4) (4) of 2).
1) from the closed state, when the handle rod (63) is operated and the operating shaft (62) is rotated to spiral upward, the rod cams (6) (6) move upward and the cams The protrusion (61) is the protrusion (42) of the sub-valve plate (4) (4)
(42), the auxiliary valve bodies (4) (4) can move back, and the pressure contact with the flow ports (II) (II) is released. Thereafter, if the valve body operating rod (24) is rotated to a position where it comes into contact with the other notched end surface (53) of the cylinder body (5),
The flow passage (21) of the valve body (2) is connected to the flow port (1) of the valve body (1).
0(II) for fluid circulation. In addition, the flow port (100υ) can be closed by the valve body (2) by rotating the valve body operating rod (24) to the position where it abuts one notch end surface (51) of the cylinder body (5). Body (2
) of the sub-valve plate (4) (4) to face the flow port θ1 (110), rotate the handle rod (63) to open the operating shaft (
When the rod cams (6) (6) are moved downward via the rod cams (62), the lower end inclined surface of the cam protrusion (61) slides against the upper end inclined surface of the protrusion (42) of the sub-valve plate (4). Sub-valve plate (4
) to the valve seat surface (31) side of the flow port (It) to bring the outer peripheral surface of the sub-valve plate (4) into contact with the valve seat surface (31), and then move the rod cam (6) downward. cam protrusion (61)
When the vertical top surface of the auxiliary valve plate (4) and the top surface of the protrusion (42) of the auxiliary valve plate (4) are brought into pressure contact with each other, the auxiliary valve plate (4) is firmly attached to the valve seat surface (31) of the flow port (II). It is crimped to seal the flow port (10) and close the flow of fluid. Note that the above-mentioned method is used as a pressing mechanism to push the sub-valve plates (4) (4) of the spherical valve body (2) from the back side. Various mechanisms other than the examples may be employed. For example, a plate cam (second embodiment) or a piston device (third embodiment) may be used instead of the rod cam (6), or
A link motion mechanism (fourth embodiment) may be employed. In the second embodiment using a plate-shaped cam, as shown in FIGS. 4 and 5, the valve body (2) has a groove (28) extending in the vertical direction.
) is formed to cross the flow passage (21) of the valve body (2), and a through hole (71) communicating with the flow passage (21) is bored in the cut groove (28). A cam (7) is inserted so as to be movable up and down, and by the up and down movement of this plate-shaped cam (7), the cam parts (72) (72) formed at the center of both end faces of the plate-shaped cam (7) and this cam part (72) (72) are inserted. ) is in sliding contact with the sub-valve plate (4) (
4) through the protrusions (42) (42) of the auxiliary valve plate (4).
(4) is configured to allow the person to enter and exit. This plate-shaped cam (the vertical movement mechanism for the force may be a screw mechanism similar to the above embodiment, but as shown in the figure, a vertically upward force is attached to the center of the upper end of the plate-shaped cam (7). The rod-shaped portion (73) integrally protruding toward the upper valve stem (22)
Insert the rack groove (74) into this rod-shaped part (73).
On the other hand, a pinion gear (75) having a knob (76) is mounted on the upper valve shaft (22) side, and this pinion gear (75) is meshed with the rack groove (74) to form the gear (7).
By rotating the knob (76) of 5), the plate-shaped cam (
7) may be configured to move up and down. In addition, when using the plate-shaped cam (7) as described above, as shown in FIGS. 6 and 7, the flow path (21) of the valve body (2)
A highly chemical-resistant metal tube (8) made of stainless steel or the like can be inserted inside. In this case, the through hole (71) of the plate-shaped cam (7) is formed into a vertically elongated oval shape to allow vertical movement of the plate-shaped cam (7). In the third embodiment, as shown in FIG. 8, the piston devices (9) (9) are used to move the sub-valves (4) (4) in and out, and the sub-valve of the valve body (2) Two to several pairs of cylinder chambers (91) (91) are formed in the portion facing the plates (4) (4), and each cylinder chamber (91) (91)
A piston device (93) having a piston (92) (92) inserted therein and extending from the piston (92) (92).
(93) is connected to the sub-valve plate (4) (4), while connecting the inside of each cylinder chamber (91) (91) to the communication passage (94).
. . through a passage (95) formed in the valve shaft (22) to an appropriate pump device or manual pump mechanism,
Pressure fluid is sent into the cylinder chamber (91) (91) to cause the piston (92) (92) to close the sub valve plate (4).
) (4) is configured to allow entry and exit. Moreover, FIG. 9 shows a fourth embodiment in which the sub-valve plates (4) (4) are moved in and out using a link mechanism, and the sub-valve is disposed on the spherical valve body (2) so as to be movable in and out. Opposite ends of a pair of upper and lower links (44) and (45) are rotatably pivoted to the center of the back of the plates (4) and (4), respectively, and are rotatable only in the horizontal direction to the upper valve shaft (22). The center part of the upper connecting rod (46) is screwed into the lower end screw part of the operating shaft (62) supported by the upper link (44), and both ends of the upper connecting rod (46)
The upper end of (44) is rotatably attached, while the lower link (45) (45) is rotatably attached to both ends of the lower connecting rod (47) fixed within the lower end of the valve body (2). It is a pivot point. These upper and lower links (44, 45) and upper and lower connecting rods (46, 47) are arranged in a space provided in the vertical direction in the center of the valve body (2). With this configuration, when the operating shaft (62) is rotated, the upper connecting rod (46) moves vertically along the screw, and this movement causes the upper connecting rod (46) (47) to pivot. The attached upper and lower links (44) (45) expand and contract, and the auxiliary valve plates (4) (4) are crimped against the flow port Q[I+].
It is something to leave. The other configurations are the same as those in the previous embodiment. [Effects of the Invention] As described above, according to the ball valve of the present invention, a spherical valve body having a flow path that can communicate with the flow port is installed inside a valve box having a flow port, and In the ball valve configured to open and close the flow port of the valve body by rotation of the valve body, a temporary sub-valve can be freely moved toward and away from the outlet on the closing surface side of the valve body that closes the flow port. The invention is characterized in that the outflow port is temporarily closed by the secondary valve by pressurizing the back side of the secondary valve plate.Therefore, the cam means or By applying back pressure such as fluid pressure, the sub-valve plate can be pushed toward the flow port side of the valve box, and the flow port can be pressed and closed more reliably and firmly by the sub-valve. . In addition, if the pressing force acting on the back side of the sub-valve plate is released, the pressure of the sub-valve plate against the flow port is released, so when rotating the spherical valve body, the outer peripheral surface of the valve body and the sub-valve plate The valve body can rotate smoothly without any strong sliding contact with the flow port of the valve body, and there is no risk of seizure. Furthermore, it has excellent heat resistance, pressure resistance, and chemical resistance. It is possible to provide a ball valve that has the following characteristics.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention; FIG. 1 is a longitudinal sectional front view of Example 1, FIG. 2 is a longitudinal sectional side view thereof, FIG. 3 is a plan view thereof, and FIG. 4 is a longitudinal sectional front view of Example 2. , FIG. 5 is a longitudinal sectional side view thereof, FIG. 6 is a longitudinal sectional front view showing a modified example of Example 2, FIG. 7 is a longitudinal sectional side view thereof, FIG. 8 is a longitudinal sectional front view of Example 3, and FIG. 9 is an example. FIG. 4 is a longitudinal sectional front view of No. 4. (1)...Valve box, (2)...Valve body, (4)...Sub-valve body, (11)...Outlet, (21)...Flow path. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 71 Z
d-mouth

Claims (1)

[Claims] [1] A spherical valve body (2) having a flow path (21) that can communicate with the flow port (11) is installed inside a valve box (1) having a flow port (11), In a ball valve configured to open and close a flow port (11) of the valve body (1) by rotation of the valve body (2), closing of the valve body (2) to close the flow port (11); A sub-valve plate (4) is arranged on the surface side so as to be able to move toward and away from the outlet (11), and the sub-valve plate (4)
A ball valve characterized in that the outflow port (11) is closed by the sub-valve plate (4) by pressurizing the back side of the ball valve.