Joke Collection Website - Mood Talk - Principle of self-operated regulating valve Function of self-operated regulating valve Self-operated temperature regulating valve Self-operated pressure regulating valve Self-operated flow regulating
Principle of self-operated regulating valve Function of self-operated regulating valve Self-operated temperature regulating valve Self-operated pressure regulating valve Self-operated flow regulating
Principle of self-operated regulating valve: the pressure and temperature of the medium flowing through the valve are used as energy to drive the valve to work automatically without external power supply and secondary instruments. This kind of self-operated regulating valve uses the feedback signal (pressure, pressure difference and temperature) from the valve output end to transmit to the actuator through the signal pipe to drive the valve disc to change the valve opening, so as to achieve the purpose of regulating pressure, flow and temperature. This kind of regulating valve is divided into direct action type and indirect action type.
Direct-acting type is also called spring-loaded type, and its structure contains elastic elements, such as spring, bellows, bellows temperature bag and so on. Using the principle of balance between elasticity and feedback signal.
The pilot valve is added to the indirect control valve, which amplifies the feedback signal, and then drives the disc of the main valve to move through the actuator to change the valve opening.
If it is a pressure regulating valve, the feedback signal is the outlet pressure of the valve and is introduced into the actuator through the signal pipe.
If it is a flow regulating valve, there is an orifice plate (or other resistance device) at the outlet of the valve, and the pressure difference signal is taken out from both ends of the orifice plate and introduced into the actuator.
If it is a temperature control valve, there is a temperature sensor (or temperature package) at the outlet of the valve, and the actuator is driven by the thermal expansion and cold contraction of the medium in the temperature sensor.
QSTP intelligent electric control valve, QSTP- 16KEA intelligent electric control valve and QJP- 16k intelligent electric control valve play a very important role in the automatic control of modern factories. The production of these factories depends on the correct distribution and control of flowing liquids and gases. These controls, whether energy exchange, decompression or simple container feeding, need some final control elements to complete. The final control element can be considered as the "physical force" of automatic control. Between the low energy level of the regulator and the high energy level function needed to control the flowing fluid, the control element finally completes the necessary power amplification. ? Regulating valve is the most widely used final control element. Other final control components include metering pump, regulating baffle and louver baffle (a variant of butterfly valve), variable inclination fan blade, current regulating device and motor positioning device different from valve. ? Although the control valve is widely used, other units in the control system may not have as little maintenance workload. In many systems, the working conditions such as temperature, pressure, corrosion and pollution experienced by control valves are more serious than other components. However, when it controls the flow of process fluid, it must operate satisfactorily and at least be maintained. ? The regulating valve plays the role of variable resistance in the pipeline. It changes the turbulence of process fluid or provides pressure drop in laminar flow, which is caused by changing valve resistance or "friction". This decompression process is often called "throttling". For gas, it is close to isothermal adiabatic state, and the deviation depends on the non-ideal degree of gas (Joule-Thomson effect). In the case of liquid, pressure is consumed by turbulence or viscous friction, both of which convert pressure into heat energy, resulting in a slight increase in temperature. ? The common control loop includes three main parts. The first part is the sensitive element, usually the transmitter. It is a device that can be used to measure adjusted process parameters, such as pressure, liquid level or temperature. The output of the transmitter is sent to the regulating instrument-regulator, which determines and measures the deviation between the given or expected values of the process parameters and the actual values, and sends the correction signals to the final control element-regulating valve one by one. The valve changed the flow rate of the fluid, so that the process parameters reached the expected value. ? In the pneumatic regulating system, the pneumatic signal output by the regulator can directly drive the spring diaphragm actuator or piston actuator to make the valve act. In this case, the energy required to determine the valve position is provided by compressed air, which should be dried in outdoor equipment to prevent freezing, purified and filtered. ? When the pneumatic regulating valve and the electric regulator are used together, an electro-pneumatic valve positioner or an electro-pneumatic converter can be used. The compressed air supply system can be regarded as the same as the regulating system for full pneumatic operation. ? Theoretically speaking, the regulating valve has both static and dynamic characteristics, so it affects the success or failure of the whole control loop. The static characteristic or gain term is the flow characteristic of the valve, which depends on the size of the valve, the combined structure of the valve core and valve seat, the type of actuator, the valve positioner, the pressure before and after the valve and the nature of the fluid. Shanghai Jiangxia Valve will serve you wholeheartedly! ! ?
QSTP- 16KEA intelligent electric single-seat regulating valve Jiangxia valve? Shanghai high pressure regulating valve? Cage sleeve regulating valve? Pneumatic cage sleeve regulating valve? QSTP- 16KEA? QSJP- 16K? T968 electric high pressure regulating valve? T96 electric high pressure regulating valve? S20 1C regulating ball valve (wafer type)? HCB cage sleeve regulating valve? Pneumatic precision small single-seat sleeve regulating valve ZJHP? ZJHM pneumatic piston cut-off valve ZSPQ? ZZYP self-operated pressure regulating valve? Pneumatic light and small regulating valve ZXMAP ZXMAN? ZXMAM type? Pneumatic diaphragm stop valve ZMC? ZSQ? ZMAQ? ZMBQ type? Micro (differential) pressure regulating valve ZZV? ZZC type? Pneumatic high pressure angle adjusting valve AMAS? AMBS type? Light and small pneumatic diaphragm adjustment butterfly valve ZMXAW? Type ZMXBW? Pneumatic light and small three-way regulating valve ZXQ- 16K? Type ZXX- 16B? Pneumatic diaphragm regulating valve ZMAT? ZMBT pneumatic diaphragm regulating valve ZMAP? ZMAN type? CV3000 series regulating valve? ZSS? V-type regulating valve? ZSS? V-shaped cutting ball valve? ZSHO pneumatic adjustment cut-off ball valve? Shanghai Jiangxia valve focuses on regulating valve? QSJP- 16K regulating valve?
I hope the above news will help you! ! ! !
Source: Shanghai Jiangxia Valve
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