Ball valve with scour-prevention valve base

[0024] according to figure 1 It can be seen that this kind of valve seat anti-scouring ball valve includes: valve body 1, ball body 2, valve seat 3, packing 13, gland 14, connecting bracket 15 and upper valve stem 12. The upper end of valve body 1 is provided with a connecting flange And the packing groove, the packing 13 is fixedly installed at the packing groove by the gland 14, the connecting bracket 15 is installed at the connecting flange by standard fasteners, the upper end of the upper valve stem 12 is provided with a key groove connected with the external driving device, and the upper valve The lower end of the rod 12 extends through the packing groove into the inner cavity of the valve body 1 and is connected to the ball 2. The ball 2 is placed in the inner cavity of the valve body 1. The outer surface of the ball 2 is a spherical surface structure. The ball 2 is provided with an inner cavity capable of connecting with the valve body 1. The valve seat 3 is made of non-metallic plastic material and is vertically arranged in the inner cavity of the valve body 1. The valve seat 3 is provided with a seat sealing surface that forms a seal with the outer surface of the sphere 2, and the sphere 2 is formed by the upper stem 12 drives and rotates 90 degrees around the vertical axis of the ball valve to open or close the ball valve. The bottom surface of the flow channel is provided with a positioning groove 8 and a straight groove. The positioning groove 8 forms a fan arc with the vertical axis of the ball valve as the center line. The straight groove is arranged directly below the horizontal axis of the ball valve. One end of the straight groove communicates with one end of the positioning groove 8, and the other end of the straight groove extends to the nearby flow passage opening; the flow passage is provided with an adjusting device, the The adjusting device includes a ball flap 4, a compression spring 5, a telescopic rod 6, a positioning rod 7, and an adjusting sleeve 11. The adjusting sleeve 11 has an inverted barrel structure and is vertically arranged in the flow channel with the vertical axis of the ball valve as the center line. One end of the ball valve 4 is provided with a spherical surface consistent with the radius of the outer surface of the ball 2, the outer circle of the ball valve 4 is consistent with the size of the diameter of the flow passage, the telescopic rod 6 is arranged horizontally, and one end of the telescopic rod 6 is fixedly arranged on the ball valve 4. On one end, the other end of the telescopic rod 6 is provided with an adjusting slot, which extends into the adjusting sleeve 11. The positioning rod 7 is arranged vertically, the upper end of the positioning rod 7 is fixed on the telescopic rod 6, and the lower end of the positioning rod 7 extends into the positioning groove In 8, the compression spring 5 is transversely arranged between the ball flap 4 and the adjusting sleeve 11; in the lower part of the valve body 1 is provided a lower outer rod 9 and a lower inner rod 10 whose axis is consistent with the axis of the adjusting sleeve 11. The lower outer rod 9 The upper end is fixedly connected with the adjusting sleeve 11, the lower end of the lower outer rod 9 extends out of the lower end of the valve body 1, the lower inner rod 10 is placed inside the lower outer rod 9, and the upper end of the lower inner rod 10 is provided with a vertical cross-section of an inverted right-angle trapezoid The pull rod extends to the upper part of the inner cavity of the adjusting sleeve 11 through the adjusting slot, the lower end of the lower inner rod 10 extends out of the lower end surface of the lower outer rod 9, and the lower end of the lower inner rod 10 is provided with a grip block.

[0025] The use method of this kind of seat anti-scouring ball valve:

[0026] The use method of closing this kind of seat anti-scouring ball valve is as follows:

[0027] a. Rotate the lower outer rod to drive the adjusting sleeve, telescopic rod, positioning rod, compression spring and ball flap to rotate along the shape of the positioning groove.

[0028] b. When the positioning rod reaches the straight groove position, the ball valve moves along the straight groove to the flow passage under the push of the compression spring, and finally the ball valve

[0029] Staying at the mouth of the flow passage, the outer surface of the ball valve and the outer surface of the sphere form a whole,

[0030] c. Then turn the upper valve stem into a 90-degree rotation to close the seat anti-scouring ball valve; at this time the valve is closed

[0031] In the process of closing, the sealing surface of the valve seat is always close to the surface of the ball or the valve seat. The medium on the inlet side of the ball valve cannot enter the outlet side through the surface of the ball or the valve seat, and the medium will not flush the sealing surface of the valve seat.

[0032] The use method of opening this kind of seat anti-scouring ball valve is as follows:

[0033] a. First turn the upper valve stem into a 90-degree rotation, so that the flow passage is aligned with the inlet of the ball valve,

[0034] b. Pull down the inner rod again, and the telescopic rod will drive the positioning rod out of the straight groove under the action of the pull rod with an inverted right-angle trapezoid in cross section.

[0035] When driving the ball valve out of the flow passage,

[0036] c. Rotate the lower outer rod again to drive the ball flap, compression spring, telescopic rod, and positioning rod to return to the original position along the positioning groove. At this time, the valve opens.

[0037] During the opening process, the sealing surface of the valve seat is always close to the surface of the ball or the valve seat. The medium on the inlet side of the ball valve cannot enter the outlet side through the surface of the ball or the valve, and the medium will not wash the sealing surface of the valve seat.

[0038] In summary, the above are only preferred embodiments of the present invention, and are not used to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc., made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.