Cut-off type power-off reset electric valve

Abstract

The invention relates to a turn-off type power failure restoration electric valve which is formed by the connection of an executing mechanism and a valve body; a drive motor, a transmission nut, a transmission screw, a coupling and a valve shaft are connected in sequence for transmission; a position signal feedback device, an analog quantity controller and a power failure restoration device are also installed in the executing mechanism; a pilot valve plate and a spool spring are installed in the middle of an upper valve plate and a lower valve plate; seal rings of polypropylene substrate material are installed on the valve plates; two ends of the transmission nut are additionally installed with a bearing; a butterfly spring is installed in the coupling. The valve has no leakage and can automatically restore when the power fails, thus saving energy and reducing consumption; the valve has easy and labor-saving opening and closing, advanced technology and excellent performance.

Description

Technical field: [0001] The invention relates to a valve in mechanical engineering, in particular to a shut-off type power failure reset electric valve. Background technique: [0002] At present, valves at home and abroad, including the products of world-renowned valve manufacturers, have the following defects in the function of their regulating valves: leakage, some medium still passes through the valve after it is closed, and it is necessary to manually close the stop valve. And other equipment or systems with strict requirements will cause immeasurable losses. At the same time, most products do not have a power failure reset device. Only Siemens valves have a power failure reset device that compresses the oil pump return spring. The elastic force closes the valve, and the oil pump is easily damaged, which wastes energy. also. All kinds of valves generally have fatal structural defects: 1. The integral valve plate bears a large pressure. According to calculations, after...

AI Technical Summary

Problems solved by technology

[0002] At present, valves at home and abroad, including the products of world-renowned valve manufacturers, have the following defects in the function of their regulating valves: leakage, some medium still passes through the valve after it is closed, and it is necessary to manually close the stop valve. and other equipment or systems with strict requirements cause immeasurable losses

All kinds of valves generally have fatal structural defects: 1. The integral valve plate bears a large pressure. According to calculations, after an electric two-way valve with a caliber of DN150 is closed under a pressure difference of 0.8MPa, the valve plate bears a pressure of 1413kg. That is to say, at least 1413kg of external force is required to close a DN150 electric two-way valve. Such a huge pressure often leads to damage to the actuator. Therefore, the production model of the valve can only be controlled below DN150, and the power required for larger models is doubled. Increase, such as a valve with a diameter of DN200 requires a closing force of 2512kg

2. A balance hole is opened on the valve plate to reduce the pressure difference, so that the force required to open the valve is reduced. For example, the Siemens valve adopts this method, but because the balance hole directly leads to the pipeline and the working system, and this system is relatively balanced The hole is often very large, which not only fails to achieve the effect of balancing the pressure on both sides of the valve plate, but also makes the leakage rate of the already leaking valve larger

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