Needle valve drive device is the use of external power needle valve opening and closing device. The purpose of using the drive is to make the operation of the valve easy and labor-saving, fast and reliable, or to achieve automatic control and remote control. The basic requirements of the valve drive are: Torque or thrust can meet the valve opening and closing needs, the stroke and torque control is accurate and reliable, the power of choice for the scene, opening and closing action in line with control requirements, the device itself is light and small. Needle valve drive device according to the output shaft movement is divided into multi-turn type, part of rotary type and linear reciprocating type. Multi-turn or multi-turn rotary type, apply to the valve stem or stem nut need to turn multiple laps to fully open or close the valve, such as Gate Valve, globe valve, the output torque value of the series is generally 40 to 10000 Nm Thrust is 20 ~ 1100 kN). Part of the rotary valve for the revolution in a circle can be fully open or close the valve, such as ball valve, butterfly valve, the output torque of the series is generally 125 ~ 125000 Nm. Linear Reciprocating For the valve stem only linear reciprocating motion can be fully open or close the valve such as needle valves. Needle valve drive by power source can be divided into manual devices, gear drives, pneumatic devices, electric devices, hydraulic devices, gas-liquid linkage, electro-hydraulic linkage. The most primitive and simple valve drive is the hand wheel, handle. With the increasing size and automation of needle valves, there is a growing need for various needle valve drives. Needle valve drive occupies an important position in industrial automation.
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