JPH0621673B2 - Ball valve - Google Patents

Description

TECHNICAL FIELD The present invention relates to a ball valve including a valve box having a flow port and a spherical valve body rotatably mounted in the valve box.

[Conventional technology]

Generally, this type of ball valve is constructed so that an O-ring is provided on the valve seat surface formed at the inner end of the valve box of the flow port, and the O-ring is pressed against the spherical valve body to maintain the sealed state. There is.

[Problems to be Solved by the Invention]

However, the above-mentioned O-ring is inferior in heat resistance, pressure resistance and chemical resistance, and there is a problem in that it is restricted by a place of use and a fluid.

Therefore, it is conceivable to use a so-called metal touch in which the valve seat surface is brought into direct pressure contact with the spherical valve body. In the case of such a structure, the valve is opened and closed when the flow port is opened and closed by the rotating operation of the spherical valve body. A new problem arises that the body may be seized on the valve seat surface.

In order to solve such a problem, for example, the actual exploitation 59
As described in JP-A-194667, a circular recess is formed on the closing surface side of a spherical valve body, and a sub-valve plate is disposed in the recess so as to be pressed against and separated from a valve seat, A ball valve has been developed in which the sub-valve plate is pressed against the valve seat side by fluid pressure. However, since the spherical valve element is rotatable with respect to the valve box, it can be rotated through this valve box. It is difficult to form a passage for supplying fluid pressure so as not to leak into the recess of the free spherical valve body.

In addition, instead of pressing the sub-valve by the fluid pressure, a turning shaft is inserted in the center of the valve shaft, and the lower end of the turning shaft is connected to the sub-valve through a meshing gear mechanism arranged in the valve to turn it. A ball valve configured to press the sub-valve toward the valve seat side by rotating the shaft is also invented, but it is extremely difficult to dispose the meshing gear mechanism in the sub-valve because of the structure. In any case, the current situation is that it has not been put to practical use.

An object of the present invention is to provide a ball valve capable of completely eliminating such problems.

[Means for Solving the Problems]

In order to achieve the above object, the ball valve of the present invention comprises:
A valve body having a flow port is provided with a spherical valve body formed by penetrating a flow passage which can communicate with the flow port, and the flow port of the valve box is opened and closed by rotating the valve body. In the ball valve described above, a circular recess is formed on the closing surface side of the valve body that closes the flow port, and the sub valve plate is disposed in the recess so that it can be brought into contact with and separated from the valve seat of the outlet. At the same time, the cam member is vertically movably inserted into the recess on the back side of the sub valve plate, and the sub valve plate is abutted by the abutment of the cam surface of the cam member and the projection protruding on the back surface of the sub valve plate. The cam member is brought into pressure contact with the valve seat, and further, the upper end of the cam member is projected upward from the spherical valve body, and the operation shaft integrally provided at the protruding end is inserted into the hollow valve shaft of the spherical valve body, The cam member is configured to be vertically moved by moving the operation shaft in the vertical direction.

[Work]

After rotating the spherical valve element so that the closing surface side faces the flow port of the valve box, the operation shaft inserted into the valve shaft is operated to move the cam member in the vertical direction. The cam surface of the cam member abuts against the protrusion protruding from the back surface of the auxiliary valve plate, and pushes the auxiliary valve plate toward the valve seat side, and strongly presses the valve seat to close the flow port.

Next, when the cam surface of the cam member is disengaged from the protrusion of the sub-valve body by operating the operation shaft, the pressure contact with the flow port of the sub-valve plate is released, and the spherical valve body is rotated to move its flow passage. The communication port is opened by making the communication with the flow port of the valve box.

As described above, when the spherical valve body is rotated, the outer peripheral surface of the valve body and the auxiliary valve plate are opened and closed without any strong sliding contact with the flow port of the valve box. No baking of the plate occurs.

〔Example〕

An embodiment of the present invention will be described with reference to the drawings. Figs. 1 to 3 show a first embodiment of the present invention, in which (1) is a valve chamber.
(1a) is a valve box having a flow port (11) (11) on both sides of the valve box (1) centered on the same center line, the spherical valve in the valve chamber (1a) of this valve box (1) The body (2) is rotatably arranged.

Further, the outlet (11) (11) of the valve box (1) is a tubular metal valve seat body having valve seat surfaces (31) (31) formed on opposing inner end surfaces.
(3) (3) is inserted and screwed, while the spherical valve body
A flow port (21) that can communicate with the flow port (11) (11) is formed through (2), and a surface perpendicular to the flow passage (21), that is, the flow port (11). A sub valve plate (4) (4) made of metal is arranged on the surface side for closing (11) so as to be pressure contacted with and separated from the flow ports (11) and (11), and the spherical valve body (2) In the closed position of, the auxiliary valve plate (4) (4) is pushed from the back side to push the auxiliary valve plate on the valve seat surface (31) (31) of the valve seat body (3) (3). (4) The outer peripheral surfaces of (4) are brought into pressure contact with each other to hold the flow ports (11) and (11) in a sealed state.

The spherical valve body (2) is rotatably mounted inside the valve chamber (1a), and the upper and lower valve shafts (22) formed in a hollow shaft cylinder shape and a solid short shaft are formed in the center of the upper and lower end surfaces thereof. Through-holes (12) provided with axially shaped lower valve shafts (23) protruding from each other on the same vertical line, and further having their upper valve shafts (22) provided in the center of the upper surface of the valve box (1).
The lower valve shaft (23) is rotatably supported by the lower end of the lower valve shaft (23) at the center of the inner surface of the lid plate (13) forming the bottom wall of the valve chamber (1a). It is movably supported.

(5) is a cylindrical body fixed to the center of the upper surface of the valve box (1) so as to surround the upper valve shaft (22), and as shown in FIG. The notch (51) is formed only within the angular range of (1) .One end face (52) formed by the notch (51) regulates the closed position of the valve body (2) and the other end face (53) regulates the release position. It is configured to do.

(24) is a valve element operating rod whose tip is integrally fixed to a proper location on the peripheral wall of the projecting end of the upper valve shaft (22), and is horizontal from the inside of the notch (51) of the tubular body (5) to the outside. And the spherical valve body (2) is operated by operating this valve body operating rod (24).
The auxiliary valve plate (4) (4) arranged on the spherical valve body (2) when it comes into contact with one end surface (52) of the notch (51) is rotatable within the notch range of The flow passage (21) of the spherical valve body (2) communicates with the flow passages (3) and (3) when it comes to the closed position facing the flow passages (3) and (3) and comes into contact with the other end surface (53). Is the release position.

Further, the auxiliary valve plate (4) can be arranged to be retractable with respect to the spherical valve body (2) by a guide pin or the like. Circular recesses (25) (25) are formed on the surface side that closes the flow port (11) (11)
(25) The auxiliary valve plate (4) (4) is slidably fitted into (25), and further, a small diameter circular guide hole (26) is formed in the bottom surface of the recess (25) (25).
(26) is formed, and a short cylindrical guide tube (41) (41) protruding from the back of the sub valve plate (4) (4) is slidably fitted into this guide hole (26) (26). It is configured by combining.

As a pressing mechanism for pushing the sub valve plates (4) (4) from the back side, in FIGS. 1 and 2, the valve body (2) facing the center of the back side of the sub valve plates (4) (4) is used. The vertical rod cams (6) (6) vertically slidably arranged on the vertical smooth surface of () are moved up and down.

The rod cam (6) is formed in a semicircular cross section, and the arcuate side of the rod cam (6) is brought into sliding contact with the valve body (2) to reduce the frictional resistance between the two and to enable smooth vertical movement and the auxiliary valve. A cam projection (61) that can abut with the protrusion (42) protruding from the rear center of the sub valve plate (4) is provided in the center of the flat surface facing the center of the rear surface of the plate (4). By moving the rod cam (6) downward so that the lower inclined surface of the cam protrusion (61) and the upper inclined surface of the protrusion (42) of the auxiliary valve plate (4) are brought into sliding contact with each other, the auxiliary valve Board (4)
While pushing the flow port (11) (11) in the direction to close it, while moving the rod cam (6) upward to separate the cam protrusion (61) from the protrusion (42), the auxiliary valve plate (4) is designed to be retractable.

The vertical operation mechanism of the rod cam (6), for example, the operation shaft (62) is threaded through the hollow portion of the upper valve shaft (22), the horizontal rod (64) at the lower end of the operation shaft (62). The center portion is connected so as to be relatively rotatable, and both ends of the horizontal rod (64) are projected to the outside from the slits (27) (27) formed in the upper valve shaft (22), and the rod cam ( 6) The upper end of (6) is integrally fixed, and a handle rod (63) is attached to the upper end of the operating shaft (62) protruding from the upper valve shaft (22).

The operation of the ball valve in the embodiment configured as described above will be described. A state in which the valve element operating rod (24) is in contact with one notch end surface (52) of the tubular body (5), that is, the spherical valve element (2 ) Sub valve plate
(4) From the state where the flow ports (11) and (11) are closed by the (4), the handle rod (63) is operated to rotate the operating shaft (62) to screw the rod shaft upward, and the rod cam (6) (6) moves up and its cam protrusion (61) is the protrusion (42) (42) of the sub valve plate (4) (4).
And the secondary valve (4) (4) can be retracted,
1) The pressure contact with (11) is released.

Then, if the valve operating rod (24) is rotated to a position where it abuts on the other notched end face (53) of the tubular body (5), the flow passage (21) of the valve body (2) will move to the valve box ( The fluid can be circulated by communicating with the circulation ports (11) and (11) of 1).

Also, the flow ports (11) and (11) can be closed by the valve body (2) by rotating the valve body operating rod (24) to the position where it abuts on the notch end surface (51) of the tubular body (5). Let the secondary valve plate (4) of the spherical valve body (2)
(4) Face the flow ports (11) and (11), and then move the handle rod (6
3) Rotate and operate the rod cams (6) (6) via the operation shaft (62).
Is moved downward, the lower end inclined surface of the cam projection (61) slides on the upper end inclined surface of the protrusion (42) of the sub valve plate (4),
Move (4) to the valve seat surface (31) side of the flow port (11) to move the auxiliary valve plate (4).
The outer peripheral surface of the valve seat surface (31) is brought into contact with the valve seat surface (31), and the rod cam (6) is moved downward so that the vertical top surface of the cam protrusion (61) and the sub valve plate.
When the top surface of the protrusion (42) of (4) is pressed against each other, the auxiliary valve plate
Firmly crimp (4) onto the valve seat surface (31) of the flow port (11).
It seals (11) and closes the flow of fluid.

4 and 5 show a modification of the pressing mechanism for pushing the sub valve plates (4) and (4) of the spherical valve body (2) from the back side. That is, a vertically extending cut groove (28) is formed in the valve body (2) so as to cross the flow passage (21) of the valve body (2), and the cut groove (28) is formed.
A plate-like cam (7) having a through hole (71) communicating with the flow passage (21) is inserted into the plate-like cam so that the plate-like cam (7) can move up and down, Cam part (72) formed in the center of the end face
The secondary valve plates (4) and (4) move in and out via the (72) and the projections (42) and (42) of the secondary valve plates (4) and (4) that are in sliding contact with the cams (72) and (72). It is configured so that

The plate cam (7) may be vertically moved by a screwing mechanism as in the above embodiment, but as shown in FIG. The rod-shaped portion (73) integrally projecting toward is inserted into the upper valve shaft (22) and the rack groove (74) is formed in the rod-shaped portion (73).
A pinion gear (75) having a knob (76) on the upper valve shaft (22) side is mounted on the shaft, and this pinion gear (75) is meshed with a rack groove (74) to rotate the knob (76) of the gear (75). By doing so, the plate-like cam (7) may be configured to move up and down.

Further, when the plate-like cam (7) as described above is used, as shown in FIGS. 6 and 7, a metal having high chemical resistance such as stainless steel is provided in the flow passage (21) of the valve body (2). The tube (8) can be inserted.

In this case, the through hole (71) of the plate-shaped cam (7) is formed into a vertically elongated oval shape to allow the plate-shaped cam (7) to move vertically.

〔The invention's effect〕

As described above, according to the ball valve of the present invention, a spherical valve body formed by penetrating a flow passage that can communicate with the flow port is provided in a valve box having the flow port, and the valve body is rotated. In the ball valve configured to open and close the flow port of the valve box by the above, a circular recess is formed on the closing surface side of the valve body that closes the flow port, and the sub valve plate is flowed out into the recess. Of the valve seat, and a cam member is vertically movably inserted into a recess on the back side of the sub valve plate so that the cam surface of the cam member and the back face of the sub valve plate project. The sub-valve plate is pressed against the valve seat by the abutment with the provided protrusion, and further,
The upper end of the cam member is projected upward from the spherical valve body, and the operating shaft integrally provided at the protruding end is inserted into the hollow valve shaft of the spherical valve body to move the operating shaft in the vertical direction. Since the cam member is configured to be moved up and down by the above, the cam member is vertically movably inserted into the recess in which the sub valve plate is disposed, as a pressing mechanism for the sub valve plate. The upper end of the cam member is projected upward from the spherical valve body, and the operating shaft integrally provided at the protruding end is inserted into the hollow valve shaft of the spherical valve body to move the operating shaft in the vertical direction. The cam surface of the cam member is configured to abut against the projection formed on the back surface of the auxiliary valve plate to press the auxiliary valve plate against the valve seat, so that the structure is extremely simple, easy and accurate. It can be manufactured well, and the auxiliary valve moves through the abutment between the cam surface and the protrusion due to the vertical movement of the cam member. It was pressed against the valve seat with a strong pressing force, in which it is possible to reliably close the flow opening.

Also, by separating the cam surface of the cam member from the protrusion of the sub-valve plate, the pressing force acting on the back side of the sub-valve plate is easily released and the sub-valve plate is separated from the valve seat. When rotating, the valve body can be smoothly rotated without causing the outer peripheral surface of the valve body or the sub-valve plate to make strong sliding contact with the flow port of the valve box, and there is no risk of burning. In addition, it is possible to provide a ball valve having excellent heat resistance, pressure resistance, and chemical resistance.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a vertical sectional front view of Example 1, FIG. 2 is a vertical sectional side view thereof, FIG. 3 is a plan view thereof, and FIG. 4 is a vertical sectional front view of Example 2. 5 is a vertical sectional side view, FIG. 6 is a vertical sectional front view showing a modified example of Example 2, and FIG. 7 is a vertical sectional side view. (1) …… Valve box, (2) …… Valve element, (4) …… Sub valve element, (11) ……
Outlet, (21) ... flow passage.

Claims (1)

[Claims] 1. A spherical valve body having a flow passage communicating with the flow port, the spherical valve body being internally provided in the valve box having the flow port, and the flow port of the valve box being opened by rotating the valve body. In a ball valve configured to open and close, a circular recess is formed on the closing surface side of the valve body that closes the flow port, and the sub valve plate is brought into contact with and separated from the valve seat of the outflow port in the recess. The cam member is freely arranged, and a cam member is vertically movable into a recess on the back side of the sub valve plate so that the cam surface of the cam member abuts the projection protruding on the back face of the sub valve plate. The auxiliary valve plate is brought into pressure contact with the valve seat by means of the cam valve, and the upper end of the cam member is projected upward from the spherical valve body, and an operating shaft integrally provided at the protruding end is provided in the hollow valve shaft of the spherical valve body. The cam member is configured to be vertically moved by inserting the operation shaft in a vertical direction by inserting the cam member in a vertical direction. Ball valve which is characterized.