Instrument Valve Overview

Instrument Valve Overview

Document.write('') ​​Instrumentation valve document.write('') : A regulator that uses an analog signal, also known as an analog document.write('') ​​instrument valve document.write('') . It determines the deviation of the analog form measured value of the controlled object parameter from the given value, and generates an analog output signal according to a certain adjustment rule to push the actuator to eliminate the deviation, so that the controlled parameter is kept near the given value or changes according to a predetermined law. In automated instrumentation, document.write('') ​​instrumentation valve document.write('') ​​is often used to synthesize the output signals of the instrumentation to control the production process. The parameters adjusted include temperature, pressure, flow rate, liquid level, composition, and the like. Document.write('') ​​gauge valve document.write('') ​​class document.write('') ​​instrument valve document.write('') according to the energy used is divided into pneumatic document.write('') ​​instrument valve document .write('') , hydraulic document.write('') ​​instrument valve document.write('') and electric document.write('') ​​instrument valve document.write('') three categories; according to principle and structure Can be divided into self-operated document.write ('') instrument valve document.write ('') , base-type adjustment document.write ('') instrument valve document.write ('') , easy to adjust document.write (' ') Instrument valve document.write ('') . Unit combination document.write ('') instrument valve document.write ('') and integrated integrated control device (see figure). Document.write('')The instrument valve document.write('') is divided into two document.write('') ​​instrument valves document.write('') , proportional meter valve , PI document.write '') Instrument valve document.write('') (proportional integral document.write('') ​​instrument valve document.write('') ), PID document.write('') ​​instrument valve document.write('') (proportional integral differential adjuster), feedforward document.write ('') instrument valve document.write ('') and so on. 1 self-operated document.write ('') instrument valve document.write ('') to adjust the energy of the medium itself or after a simple conversion to drive the regulating valve to achieve automatic adjustment. The float type liquid level regulator (such as the toilet) uses the buoyancy of the float on the liquid surface to operate the regulating valve . This regulator does not require external energy and is a device that is adjusted locally. The utility model has the advantages of simple structure and easy maintenance, and is suitable for a single parameter adjustment system with low control precision. It is very similar in principle and structure to pneumatic actuators and is often classified as an actuator. 2 base document.write ('') instrument valve document.write ('') an indicator recording instrument with an additional adjustment mechanism. It receives the signal from the detecting component, and drives the adjusting mechanism to send a control signal by the action of the indicating and recording mechanism, and sends it to the actuator for automatic adjustment. Dynamic type indicating adjustment instruments, electric and pneumatic recording instruments with electric or pneumatic regulators are all of this type, and they are widely used to control a single production unit. Simple document.write('') ​​instrument valve document.write('') A signal that can directly accept the detection component, without a pointing mechanism, with a special purpose and simple structure. It can also accept signals from the transmitter. The non-indicating regulator and the temperature alarm are both simple adjustment instruments and are widely used in small and medium-sized enterprises. The 4-unit combination meter consists of a set of adjustment instruments consisting of several standard units with independent functions. It is fully adapted to the requirements of large-scale units and process control, and can achieve complex control of multiple circuits (see electric unit combination meter, pneumatic unit combination meter). 5 Assembled integrated control device, referred to as assembled instrument, is a special control device that combines various independent functional components according to the requirements of a large unit or process control. It can be assembled according to the needs of the user, so it has great flexibility

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