The needle valve drive device is a device that uses a power to open and close a needle valve . The purpose of using the drive unit is to make the operation of the valve labor-saving, convenient, quick and reliable, or to achieve automatic control and remote control. The basic requirements for the valve drive device are: the torque or thrust can meet the opening and closing requirements of the valve, the control of the stroke and torque is accurate and reliable, the power selection is suitable for the site situation, the opening and closing action meets the control requirements, and the device itself is light and small. The needle valve drive device is divided into three types: multi-turn type, partial-rotation type and linear reciprocating type according to the output shaft movement mode. Multi-turn type, that is, multi-turn type, suitable for valves with valve stem or stem nut that need to be rotated many times to fully open or close, such as gate valve and globe valve, the series of output torque value is generally 40 ~ 10000 Nm ( The thrust is 20 to 1100 kN ) . Partial rotary type is suitable for valves with full or full closing of the valve stem within one revolution, such as ball valve and butterfly valve. The output torque series is generally 125 to 125000 Nm. Linear reciprocating type is suitable for valves with full or full closing of the valve stem only for linear reciprocating motion, such as needle valve . The needle valve driving device can be divided into a manual device, a gear transmission device, a pneumatic device, an electric device, a hydraulic device, a gas-liquid linkage device, an electro-hydraulic linkage device, etc. according to the power source. The simple valve actuators of zui original and zui are handwheels and handles. With the enlargement of the needle valve and the automation of the production process, there is an increasing demand for various needle valve driving devices. Needle valve drive units play an important role in industrial production automation. |