Double-rocker friction-free hard seal butterfly valve

Abstract

The invention discloses a double-rocker friction-free hard seal butterfly valve. The butterfly valve is characterized by comprising a valve body, a valve main body, a valve seat, a main valve shaft, a small valve shaft, a guide shaft, a guide groove, a butterfly plate, an incomplete big gear, a pinion, a shifting rod, a linkage rod, an intermittent mechanism and a drive device, wherein a through hole is formed in the valve main body, a valve neck is welded at the through hole, meanwhile, the valve seat is welded in the inner circle surface of the valve main body, and the outer circle surface of the valve seat is conical; the butterfly plate is of an annular structure, a movable butterfly plate with a hard seal ring is installed at the outer circle position of the butterfly plate, the movable type is a movement structural manner that the butterfly plate is capable of horizontally moving in the axial direction of the valve main body first, and then rotating by taking the guide shaft as a centre, and the butterfly plate is opened in a zero-friction mode, the butterfly plate is connected with the guide shaft, a self-lubricating shaft sleeve is installed at the junction of the butterfly plate and the guide shaft through interference fit, the self-lubricating shaft sleeve is in clearance fit with the guide shaft, and the guide shaft is installed in the guide groove; and a compression spring is installed in the guide groove.

Description

technical field [0001] The invention relates to valve technology, in particular to a double rocker frictionless (zero friction) hard seal butterfly valve. Background technique [0002] Existing hard-sealed butterfly valves usually include a valve body, a valve stem, a butterfly plate and a valve seat. The butterfly plate can rotate in the valve body, and the valve seat is embedded on the inner circumference of the valve body. The outer eaves of the plate are inlaid with seals, and the inner circle of the valve seat sprayed with sealing material and the outer circle of the seals on the outer eaves of the butterfly plate form a sealing pair. When the valve is closed, relying on the radial compression force of the butterfly plate and the thrust of the positive medium, the sealing ring is elastically deformed, and the sealing specific pressure is generated to realize the interference fit seal and achieve the sealing effect between the butterfly plate and the valve seat. However...

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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