The coordination of needle valve and pressure gauge can be said to be very suitable. The general needle valve is made of threaded connection. Nominal pressure: PN2.5 PN4 PN6.4 PN16 PN32Mpa Nominal diameter: DN5~DN25, suitable for Used in liquids, gases or corrosive and non-corrosive media. The needle valve drive device is a device that uses external power to open and close the needle valve. The purpose of using the drive device is to make the operation of the valve labor-saving, convenient, fast and reliable, or to realize automatic control and remote control. The basic requirements for the valve drive device are: the torque or thrust can meet the opening and closing needs of the valve, the control of the stroke and torque is accurate and reliable, the selection of power is suitable for the site conditions, the opening and closing actions meet the control requirements, and the device itself is light and small. Common ones are: internal thread needle valve, pressure gauge needle valve, etc. The needle valve drive device is divided into three types: multi-turn type, part-turn type and linear reciprocating type according to the movement mode of the output shaft. The multi-turn type is the multi-turn rotary type, which is suitable for valves whose stem or stem nut needs to be rotated for many turns to fully open or fully close, such as gate valve
s and globe valves. The series of output torque values are generally 40 to 10,000 Nm ( The thrust is 20 to 1100 kN). Partial rotation type is suitable for valves whose stem can be fully opened or fully closed within one rotation, such as ball valves and butterfly valves. The output torque is generally 125-125,000 Nm. The linear reciprocating type is suitable for valves such as needle valves that can be fully opened or fully closed by only linear reciprocating motion of the valve stem. According to the power source, the needle valve driving device can be divided into manual device, gear transmission device, pneumatic device, electric device, hydraulic device, gas-liquid linkage device, electro-hydraulic linkage device, etc. The most primitive and simplest valve actuation device is the handwheel and handle. With the large-scale needle valve and the automation of the production process, there are more and more needs for various needle valve drive devices. Needle valve drives play an important role in industrial production automation. The selection of valve driving mode is based on: the form, specification and structure of the valve, the opening and closing torque of the valve (line pressure, the maximum pressure difference of the valve), thrust, ambient temperature and fluid problems, use method and frequency of use, opening and closing speed and Time, stem diameter, pitch, rotation direction, connection method, power source parameters: electric power supply voltage, phase number, frequency; pneumatic air source pressure; hydraulic hydraulic source pressure. Special consideration: low temperature, anti-corrosion, explosion-proof, waterproof, fire-proof, radiation-proof, etc. The difficulty in choosing the valve body material is that not only the corrosion problem, but also the pressure and temperature resistance capability, whether it is economically reasonable, and whether it is easy to purchase must be considered. The second is to take lining measures, such as lead lining, aluminum lining, engineering plastic lining, natural rubber lining and various synthetic rubbers. If the media conditions permit, this is an economical method. Thirdly, when the pressure and temperature are not high, using non-metal as the main material of the valve can often effectively prevent corrosion. The above is the driving device of the needle valve shown to everyone. The commonly used material of needle valve is stainless steel or carbon steel. Because there are many issues to consider when selecting materials, depending on whether it will react or whether it will be corroded by the medium and so on. The needle valve will also be corroded by the atmosphere after using it for a long time, but we can protect the needle valve by painting.
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