Small-torque electric ball valve

Abstract

The invention discloses a small torque electric ball valve, which comprises a valve body (1), a ball valve core (2), a sealing ring (3), an O-ring (4), a valve stem (5) and an electric driver (6). In the present invention, an elastic and silicon rubber O-ring is arranged between the sealing ring and the valve body. When the electric ball valve is started, a shearing and sliding tendency occurs between the ball valve core and the sealing ring, and the elasticity of the O-ring is used to make the sealing ring produce Elastic retreat, reducing and overcoming the static adhesion between the ball valve core and the sealing ring, using a small torque to make the static friction between the ball valve core and the sealing ring transition to dynamic friction, thereby reducing the technical scheme of the starting torque, making the electric ball valve , to achieve the purpose of reducing the starting torque and turning torque.

Description

technical field [0001] The invention relates to a ball valve, in particular to a small torque electric ball valve driven by a motor and used for pipeline switching. Background technique [0002] A sealing ring of hard polytetrafluoroethylene for sealing is provided between the ball valve core and the valve body of the electric ball valve of the prior art. figure 2 ;In order to prevent leakage, the sealing ring and the ball valve core are in a tight sliding fit, and the torque for the motor to turn the ball valve core through the valve stem to switch is inherently large. In practical applications, due to the static adhesion effect between the ball valve core and the sealing ring, the When the electric ball valve in the open or closed state is started, the static adhesion effect will cause the static friction between the ball valve core and the sealing ring to jump to the threshold of dynamic friction and increase, resulting in an abnormal increase in the starting torque, that...

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Problems solved by technology

[0002] A sealing ring of hard polytetrafluoroethylene for sealing is provided between the ball valve core and the valve body of the electric ball valve of the prior art. figure 2 ;In order to prevent leakage, the sealing ring and the ball valve core are in a tight sliding fit, and the torque for the motor to turn the ball valve core through the valve stem to switch is inherently large. In practical applications, due to the static adhesion effect between the ball valve core and the sealing ring, the When the electric ball valve in the open or closed state is started, the static adhesion effect will cause the static friction between the ball valve core and the sealing ring to jump to the threshold of dynamic friction and increase, resulting in an abnormal increase in the starting torque, that is, "stuck and seized". "Phenomenon, ranging from making the response speed of the electric ball valve slow, and severely damaging the electric drive of the electric ball valve; therefore, the existing technology has the problem and deficiency of large starting torque

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