What is the function of the disassembly video of pneumatic low load regulating butterfly valve? According to the movement direction of the actuator output, the actuator is divided into positive and reaction actuators. When the input signal of the positive acting actuator increases, the valve rod moves outward. When the input signal of reaction actuator increases, the valve rod moves inward. According to the type of actuator output displacement, actuators are divided into straight stroke actuators, angular stroke actuators and multi turn actuators. The straight stroke actuator outputs linear displacement. The angular travel actuator outputs angular displacement, and the angular displacement is less than 360 °. For example, the rotation angle is 90 ° or 60 ° for the actuator of butterfly valve. The multi turn actuator is similar to the angular travel actuator, but the angular displacement of rotation can reach many turns.
According to the type of actuator components, electric actuators are divided into membrane actuators, piston actuators, gear actuators, manual actuators, electro-hydraulic actuators, etc.
According to the action mode of the actuator, the actuator is divided into continuous and discrete types. The output of the continuous type actuator is a continuously changing displacement signal. The output of discrete actuator is the displacement signal of switch change. Solenoid valve is a commonly used electric discrete control valve, and safety vent valve is also a commonly used discrete control valve.
According to the installation mode of the actuator, the actuator is divided into direct installation type and side installation type. The direct mounted actuator is directly installed on the regulating mechanism. The side mounted actuator is installed on the side of the regulating mechanism, and it changes the displacement direction and force through a force amplifier.
According to the action characteristics of the output and input of the actuator, the actuator can be divided into proportional type, proportional integral type and other types. The output of the proportional actuator has a linear relationship with the input signal. The output of the proportional integral actuator is the sum of the proportional and integral actions of the input signal.
According to the type of input signal of the actuator, the actuator is divided into analog actuator and digital actuator. Analog actuators receive analog signals, such as 20~100kPa air pressure signals, 4~20mA standard current signals, etc. The digital actuator receives digital signals, usually a series of binary signals, for opening and closing the corresponding digital valve. With the application of fieldbus technology, actuators that receive fieldbus digital signals are being widely used.
There are also different types of regulating mechanisms. Generally, the regulating mechanism is called a valve. According to the structure classification, the regulating mechanism is divided into straight single seat valve, straight double seat valve, three-way valve, angle valve, high-pressure valve, diaphragm valve, sleeve valve, butterfly valve, eccentric rotary valve, gate valve, butterfly valve, etc. For most common valves, relevant valve accessories can be added, such as actuator, valve positioner, valve position detection sensor, etc.
According to the flow characteristics, the regulating mechanism is divided into linear valve, equal percentage valve and quick opening valve. According to the form of valve core, the regulating mechanism is divided into straight stroke valve core and angular stroke valve core. The straight stroke valve core is divided into flat plate type, plunger type, window type, multi-stage type and sleeve type. The angle travel valve core is divided into eccentric rotary type, ball type, V-notch type and butterfly type. According to the form of valve cover on the regulating mechanism, the regulating mechanism can be divided into ordinary type, heat dissipation or absorption type, bellows seal type, long neck type, etc.
、 In electric power, chemical industry, environmental protection and other industries, we can often see the "hard work" operation of electric butterfly valves. Nowadays, the electric on-off butterfly valve has already become an indispensable important device in the automation industry, especially by virtue of the convenient and environmentally friendly installation method, it is favored by many customers. As a novice buyer, how to choose a butterfly valve? Yoshi Fluid Editor will briefly introduce some shopping elements.
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