Diaphragm valve with middle and large caliber controlled by small moment

Abstract

The invention relates to a diaphragm valve, in particular to a diaphragm valve with a middle and large caliber controlled by small moment. The technical scheme is characterized in that the diaphragm valve with the middle and large caliber controlled by the small moment comprises a valve body and a valve cap; the valve body is internally provided with a valve passage, a valve seat and a valve core; a connecting chamber for communicating a medium inflow passage with a medium outflow passage is arranged between the valve cap and the valve body; the valve core is a diaphragm and a component for arranging the diaphragm; the diaphragm and the component are arranged between the medium inflow passage and the medium outflow passage and is contacted with the valve seat; the end surface of the diaphragm, facing to the medium inflow passage, is provided with a plurality of pilot holes; the valve body is provided with a diversion passage which is communicated with the connecting chamber; the diversion passage is internally provided with a pressure relief passage that is communicated with the environment; and a microswitch is arranged between the pressure relief passage and the diversion passage. By adopting the technical scheme, the opening/closing and flux regulating of the diaphragm valve with the middle and large caliber can be controlled by the small moment.

Description

technical field [0001] The invention relates to a diaphragm valve, in particular to a diaphragm valve with medium and large diameter for small torque control. Background technique [0002] At present, the opening and closing force and opening and closing torque when the valve is opened or closed, when closing the valve, it is necessary to form a certain sealing specific pressure between the opening and closing member and the two sealing surfaces of the seat, and at the same time, it is necessary to overcome the gap between the valve stem and the packing. The friction force and medium pressure between the thread of the valve stem and the nut, the support at the end of the valve stem and other friction parts, and the medium pressure, so a certain opening and closing force and opening and closing torque must be applied, and the maximum value is at the final moment of closing or opening the first instant of . As a result, large torque actuators (motors, cylinders, handwheels, e...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the deficiency that the existing medium and large diameter valves cannot open and close valves with small torque, the present invention provides a small torque control medium and large diameter diaphragm valve, which can not only control the medium and large diameter diaphragm valve with small torque Valve opening and closing and flow adjustment, and can easily adopt intelligent control, manual control, electric control, electromagnetic control, pneumatic control, hydraulic control

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