һ. Selection
A. Selection importance
Regulator is self-Control system actuators, its application quality direct responsed in system control quality. As process control terminal components, people have newer understanding to its importance, compared with the past. Good or bad regulator application, except the product itself quality, whether user is correct installation, operation and maintenance, correct calculation, selection is very important. Due to the calculation and selection fault, cause system start and stop at times, and some even are unable to use, so to users and system design personnel should know the valve on-site importance, it is necessary to pay more attention to the regulator selection.
B. Selection principles
1. according to the process conditions, choosing appropriate structure form and material.
2. according to the technics object's characteristic, choose regulator flow characteristics.
3. according to the craft operating parameters, selecting the appropriate regulator diameter.
4. according to the process requirement and select the desired auxiliary devices.
5. rational selecting actuators. Actuator response speed should be able to meet the process.

2012-05-24

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