Valve drive classification
Press the movement of the drive mechanism, the valve drive is divided into two straight-stroke and angular travel.
Press the drive structure, the valve drive is divided into:
Valve drive mode
Manual drive handle handwheel (including through the intermediate gear deceleration)
Spring Lever Electric Drive Electromagnetic Motor Pneumatic Drive
1, diaphragm type
2, cylinder type
â‘ piston cylinder type
â‘¡ piston rack type
â‘¢ piston rod
â‘£ piston fork type
⑤ piston screw type
3, leaf type
4, air engine type
5, film and ratchet combination
Hydraulic Drive Hydraulic Cylinder Hydraulic Motor - Driven Electro - hydraulic Drive
Various types of valve drive features
Electric device advantages
1, Applicability is strong, not affected by the ambient temperature
2, a wide range of output torque
3, easy to control, can freely use DC, AC, shortwave, pulse and other signals, suitable for amplification, 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 of electric devices
1, the structure is complex
2, low mechanical efficiency, 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
Hydraulics advantages
1, the structure is simple, compact, small size
2, the output power
3, easy to get low-speed or high-speed, stepless speed change
4, can be long-distance automatic control
5, due to the viscosity of hydraulic oil and high efficiency, self-lubricating properties and anti-rust properties
Disadvantages
1, changes in oil temperature caused by changes in oil viscosity
2, hydraulic components and pipe leakage
3, accompanied by pipe, maintenance inconvenient
4, not suitable for the signal for a variety of operations
Pneumatic device advantages
1, the structure is simple
2, gas source easy to get
3, can get a higher switching speed
4, can be installed governor, so that the switching speed adjusted as needed
5, gas compression, when the closure is flexible
Disadvantages
1, Compared with the hydraulic structure larger, not suitable for large diameter high pressure valve
2, due to the gas compression, so the speed is not uniform
Valve drive selection
Valve drive based on the choice is:
Valve form, size and structure.
Valve opening and closing torque (pipeline pressure, the maximum pressure valve), thrust.
Maximum ambient temperature and fluid problems.
How to use and how often to use.
Opening and closing speed and time.
Stem diameter, pitch, direction of rotation.
Connection method.
Power source parameters: electric power supply voltage, phase, frequency; pneumatic source pressure; hydraulic hydraulic source pressure.
Special considerations: low temperature, corrosion, explosion, water, fire, radiation and so on.
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