Fireproof type three-eccentric sealed butterfly valve

Abstract

The invention belongs to the technical field of a fluid control valve and particularly relates to a fireproof type three-eccentric sealed butterfly valve. The fireproof type three-eccentric sealed butterfly valve comprises a valve body, wherein a valve plate is mounted in a cavity of the valve body; a mounting hole of the valve plate and a through hole of the valve body are coaxially arranged; a rotary shaft is arranged in the through hole of the valve body in a penetrating manner and the mounting hole sleeves the rotary shaft; a stuffing assembly is arranged at a stuffing box of the upper part of the valve body; a stuffing pressing cover is arranged at the upper end of the stuffing assembly; a stuffing pressing plate is pressed on the stuffing pressing cover; the stuffing pressing cover is fixed on the upper end face of the valve body by a screw rod and a locking nut; a transmission shaft upwards penetrates out from a through hole of the stuffing pressing plate; a metal sealing ring, a non-metal sealing ring and a pressing ring are sequentially arranged on the valve body and correspondingly to the upper side of the valve plate; the pressing ring and the valve body are firmly connected by an inner hexagon screw. The sealed butterfly valve has a fireproof function and can realize effective sealing.

Description

technical field [0001] The invention belongs to the technical field of fluid control valves, in particular to a fireproof triple eccentric sealing butterfly valve. Background technique [0002] With the development of the economy, the level of industrial automation control is constantly improving, so the requirements for the reliability of valves in process control are also continuously improved, and higher requirements are also put forward for the sealing performance of valves. In the existing technology, the butterfly valve used for fire protection is usually a metal-sealed butterfly valve. The defect is that the metal-sealed butterfly valve generally does not have high requirements on the leakage level, and at the same time requires a large torque, the wear of the sealing surface is large, the service life is short, and the two-way seal The effect is not ideal, and the long-term good sealing performance of the valve cannot be guaranteed; non-metallic sealing butterfly val...

AI Technical Summary

Problems solved by technology

In the existing technology, the butterfly valve used for fire protection is usually a metal-sealed butterfly valve. The defect is that the metal-sealed butterfly valve generally does not have high requirements on the leakage level, and at the same time requires a large torque, the wear of the sealing surface is large, the service life is short, and the two-way seal The effect is not ideal, and the long-term good sealing performance of the valve cannot be guaranteed; non-metallic sealing butterfly valves are generally not suitable for high-temperature conditions, especially in the event of a fire, and cannot be effectively sealed; the traditional three-eccentric butterfly valve has high production costs and poses a threat to workers. High assembly requirements; therefore, a butterfly valve with low production cost, strong versatility, fire protection function, and high leakage level requirements has become an urgent need

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