A zero friction hard seal butterfly valve

Abstract

The invention discloses a zero-friction hard seal butterfly valve. The zero-friction hard seal butterfly valve is characterized in that the butterfly valve comprises a valve opening, a valve body, a valve seat, a disc, a valve shaft, a guide groove, an incomplete gear, a rack, a guide shaft No.1, a guide shaft No.2, a self-lubricating shaft sleeve, a linkage rod, an intermittent mechanism, a driving handle and a seal device, a through hole is formed in the valve body, a valve neck is welded at the part of the through hole, the valve seat is welded on the inner circumferential surface of the valve body, and the outer circumferential surface of the valve seat is a conical surface; the disc is a moving type disc and adopts a ring structure, a hard seal ring is mounted at the outer circle part of the disc, and the movement type refers to a motion structural mode that the disc can first make transverse movement along the axial direction of the valve body and then rotate with the guide shaft No.1 as a center and is opened in a zero friction manner; the disc is connected with the guide shaft No.1; the guide shaft No.1 is mounted in the guide groove and penetrates through the rack, and the guide shaft No.1 is also in interference fit with the rack at the connecting part; and the guide shaft No.2 is also mounted in the guide groove.

Description

technical field [0001] The invention relates to valve technology, in particular to a zero-friction hard-sealing butterfly valve. Background technique [0002] The hard seal butterfly valve usually includes a valve body, a valve stem, a valve plate and a valve seat. The valve plate can rotate in the valve body, and the valve seat is set on the inner circumference of the valve body. The sealing ring on the outer circumference forms a sealing pair. When the valve is closed, the radial compression of the valve plate and the axial thrust of the positive medium make the sealing ring close to the valve seat, elastic deformation occurs, and the sealing specific pressure is generated to realize valve sealing. Seal between plate and valve body. In the prior art, due to structural reasons, the sealing specific pressure between the sealing pairs is fixed. When the valve plate is opened and closed, there is always friction between the sealing pairs, which increases the torque of the ope...

AI Technical Summary

Problems solved by technology

However, there are still some deficiencies in the three-rod butterfly valve: 1. The three-rod butterfly valve is a translational motion at the moment of opening, but the translational motion is not along the axis of the valve body, and the translational distance is small, and zero friction cannot be completely realized; 2. The movement of the board is not flexible, and there is a phenomenon of jamming during the opening and opening process; 3. The opening and closing is not in place, which is easy to cause leakage

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