Instrument valve working principle
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Instrument valve: the use of analog signal regulator, also known as analog instrument valve. It determines the controlled object parameters of the analog form of the measured value and the deviation of the given value, and according to a certain regulation law to produce analog output signal to promote the actuator to eliminate bias, the controlled parameters remain in the vicinity of a given value or change in accordance with a predetermined law. In automation instrumentation, instrumentation valves are often used to integrate instrumentation output signals in order to control the manufacturing process. The adjusted parameters include temperature, pressure, flow, level, composition and so on. Instrument valve classification Instrument valve according to the energy used is divided into pneumatic instrument valve, hydraulic instrument valve and electric instrument valve three; according to the principle and structure can be divided into self-operated instrument valve, base adjustment instrument valve, simple adjustment instrument valve, Unit combination instrument valve and assembly type integrated control device. Meter valve by adjusting the role of the instrument is divided into two, proportional instrumentation valve, PI instrument valve (proportional integral instrument valve), PID instrument valve (proportional integral differential regulator), feed-forward instrument valve. A self-acting instrument valve to be adjusted medium itself energy or after a simple conversion control valve driven to achieve automatic adjustment. Float level regulator (such as the bathroom) is the use of float on the surface of the buoyancy control valve. This regulator does not require external energy, is an on-site adjustment of the device. It is simple in structure, easy to maintain and suitable for single parameter control system with low control precision. It is very similar in principle and structure to a pneumatic actuator and is often classified as an actuator. 2 Base Instrumentation Valve An indicating recorder with an additional adjustment mechanism. It receives the signal sent by the detection element, by indicating the action of the recording mechanism drives the adjusting mechanism to send the control signal to the actuator for automatic adjustment. Dynamic indicator instruments, electric and pneumatic recorders with electric or pneumatic regulators fall into this category and are used extensively to control individual production equipment. Simple instrument valve can receive a direct detection of the signal components, without the agency, the more specialized and simple structure of the instrument. It also accepts the transmitter's signal. No indicator regulator and temperature alarm are easy to adjust the instrument, widely used in small and medium enterprises. 3 Unit The instrument consists of a set of regulating instruments consisting of several standard cells with independent functions. It is fully adapted to the requirements of large units and process control, enabling complex control of multiple circuits (see electric unit instrument cluster, pneumatic unit instrument cluster). 4 assembly type integrated control device referred to as the assembly type instrument, is in accordance with the requirements of a large unit or process control, use a variety of independent functional components into a combination of dedicated control device. It can be assembled according to the needs of the user, which has a lot of flexibility Search Keywords: Valve Technical Articles