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Valve drive features and options
First, the valve driven by the classification of the drive mechanism of movement, the valve drive is divided into two straight-stroke and angular travel. According to the driving structure, the valve driving device is divided into: valve driving mode manual driving handle handwheel (including reduction by intermediate gear) spring lever type electric driving electromagnetic motor type pneumatic driving 1, diaphragm type 2, cylinder type ①piston cylinder type ② Piston rack type ③ Piston rod linkage ④ Piston Piston ⑤ Piston screw type 3, Blade 4, Air engine type 5, Film and ratchet combined hydraulic drive hydraulic cylinder hydraulic motor type linkage drive electro-hydraulic two, Features of all kinds of valve drive Advantages of electric device 1, Applicability is strong, not affected by ambient temperature 2, Wide range of output torque 3, Convenient control, Can freely adopt various signals such as DC, AC, shortwave and pulse, Suitable for magnification, memory, logic judgment and calculation work 4, can achieve ultra-miniaturization 5, with mechanical self-locking 6, easy to install 7, easy maintenance and repair Disadvantages 1, the structure is complex 2, the mechanical efficiency is low, generally only 25% ~ 60% 3, the output speed can not be too low or too high 4, susceptible to power supply voltage and frequency changes The advantages of liquid moving device 1, the structure is simple, compact, small size 2, The output power is large 3, easy to obtain low speed or high speed, can be continuously variable speed 4, automatic control can be long distance 5, due to the viscosity of the hydraulic oil and high efficiency, self lubrication and rust performance shortcomings 1, Oil viscosity changes 2, hydraulic components and piping leakage 3, escalating, inconvenient maintenance 4, not suitable for signal computing a variety of aerodynamic advantages 1, the structure is simple 2, gas source is easy to get 3, can get higher Of the switching speed 4, can be installed governor, so that the switching speed as needed to adjust 5, gas compressibility, the flexibility when closed 1, compared with the hydraulic structure larger, not suitable for large diameter high pressure valve 2, the gas is compressible, so the speed is not uniform Three, the choice of the valve drive The choice of valve drive is based on: 1. Valve form, size and structure 2. Valve opening and closing torque (pipeline pressure, the maximum valve Pressure difference), thrust 3. Maximum ambient temperature and fluid problems 4. How to use and the number of 5. Opening and closing speed and time 6. Stem diameter, pitch, direction of rotation 7. Connection 8. Power Source parameters: electric power supply voltage, the number of phases, frequency; pneumatic source pressure; hydraulic pressure of the hydraulic source 9. Special Considerations: low temperature, corrosion, explosion, water, fire, radiation and so on Valves Technical Articles Manual Drive Handwheel Handwheel (Including Gear Reduction via Intermediate Gear) Spring Lever Electric Drive Electromagnetic Motorized Pneumatic Drive 1, Diaphragm Type 2, Cylinder Type ①Piston Cylinder Type ② Piston Rack Type ③ Piston Connecting Rod Type ④ Piston Piston ⑤ Piston Screw Type 3, Blade Type 4, Air Motor Type 5, Film and Ratchet Combination Hydraulic Drive Hydraulic Cylinder Type Hydraulic Motor-Driven Electro-hydraulic Electric Actuator Benefits 1, Applicability is strong, not affected Ambient temperature effects 2, Wide range of output torque 3, Convenient control, Free to use DC, AC, shortwave, pulse and other signals, Suitable for amplification, memory, logic judgment and calculation work 4, Can achieve ultra-small 5, with mechanical self-locking 6, easy to install 7, easy maintenance and repair Disadvantages 1, the structure is complex 2, the mechanical efficiency is low, generally only 25% to 60% 3, the output speed Can not be too low or too high 4, susceptible to power supply voltage and frequency changes The advantages of hydraulic devices 1, the structure is simple, compact, small size 2, the output power of 3, easy to get low or high speed, Long-distance automatic control 5, due to the viscosity of hydraulic oil and high efficiency, self-lubricating properties and rust-proof performance shortcomings 1, the oil temperature changes caused by changes in oil viscosity 2, hydraulic components and pipe leakage 3, accompany pipe, Inconvenient maintenance 4, not suitable for a variety of computing signals Pneumatic device advantages 1, simple structure 2, gas source easy to get 3, can get a higher switching speed 4, the governor can be installed to make the switching speed adjusted as needed 5, gas compression, the flexibility when closed 1, compared with the hydraulic structure larger, not suitable for large-diameter high-pressure valve 2, due to gas compression, so the speed is not uniform