a valve

Abstract

The invention discloses a valve. A valve flap of the valve is connected to the inner portion of a valve body through a thread structure in a threaded mode, wherein the thread structure extends in the direction surrounding a valve port, a rotation stopping insertion groove is matched with a rotation stopping plug in a rotation stopping and inserted mode in the direction of the valve port, the rotating stopping insertion groove is formed in the valve flap, the rotation stopping plug is correspondingly arranged on a valve rod, and the rotation stopping plug is in pilot fit with the rotation stopping insertion groove in the length direction of the valve rod. When the valve is used, the valve rod can drive the valve flap to rotate in the valve body, the performance that the valve rod can be disengaged from the valve flap in the direction of the valve port can be guaranteed with the help of the pilot fit between the rotation stopping plug and the rotation stopping insertion groove, and therefore the valve rod can not be influenced by the assembly errors of the valve flap in a valve cavity while providing the torque required by the opening motion and the closing motion of the valve flap for the valve flap, and reliability and stability of the movement of the valve flap in the valve cavity can be guaranteed.

Description

technical field [0001] The present invention relates to a valve. Background technique [0002] The Chinese patent with application number 201220740567.9 discloses a balanced high-pressure globe valve. The high-pressure globe valve includes a valve body with a valve cavity inside and a valve disc and a valve stem assembled therein. The upper end of the valve stem is coaxially screwed into the drive screw. In the lower end of the sleeve, the outer circumference of the lower end of the transmission screw sleeve protrudes from the upper and lower limits of the transmission shoulder installed in the valve body, the upper circumference of the transmission screw sleeve is equipped with a handle for anti-rotation, and the valve stem is installed in the valve body for anti-rotation; The lower end of the valve stem is protruded with a limit shoulder, which is inserted into the installation hole opened on the upper end of the valve disc, and the part of the wall of the installation hol...

AI Technical Summary

Problems solved by technology

However, a sealing ring is embedded on the outer periphery of the valve clack. Under the influence of the assembly error of the valve clack and the valve cavity, the friction force will appear everywhere in the circumferential direction of the sealing ring when the valve clack moves up and down with the valve stem. The size is different, so that the valve disc will deflect during the up and down movement, and the deflection of the valve disc will press the valve stem to deflect with the disc deflection, and the deflection of the valve stem will cause the gap between the valve stem and the transmission screw sleeve. The threaded connection structure between the valves is squeezed and deformed, so that the threaded connection structure between the valve stem and the transmission screw sleeve is destroyed, and the valve stem may be locked or slipped, which will affect the normal switching action of the valve.

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