The process of industrial development proves that the development of industries requires corresponding standardization as a supporting condition.Standards come first, and the manufacturing industry of regulating valves is no exception. Standards are used to measure product quality, achieve coordination and information exchange among different manufacturers, and play an important role in determining technical systems, promoting technological integration, strengthening scientific management, and improving product quality. They are becoming increasingly internationalized. Today we will talk about how popular science control valves have embarked on the path of standardization.
The standardization of the control system on the national standard is the responsibility of IEC Technical Committee 65 (TC65), titled "Industrial Process Measurement and Control". The task is to develop international standards for industrial process measurement and control systems and system components, and coordinate related standardization work that affects the matching of measurement and control systems.
The 9th Working Group (WG9) of the SC65B Group "System Components" under TC85 is responsible for the standard development of industrial process control valves. The task is to develop basic requirements, end face distance and related dimensions, rated pressure, leakage and other performance requirements, size calculation methods, and evaluation methods for various control valve body components, actuators, and locators used in industrial process control.
In 1997, the IEC changed all standards to the 60000 series, and the standard number for industrial process control valves was EC60534. There are currently 9 parts and 17 standards in this family of standards, among which the 9th part is dedicated to the noise estimation of multi-stage valve core types that adapt to the development of control valve manufacturing and are designed for multi-stage pressure reduction and interstage pressure recovery; After 2010, the 2-1 flow calculation and 8-2 and 8-3 noise estimation standards were updated.
Figure 2- Electric Control Valve
Internationally, regulating valve manufacturers have accepted the IEC standards and adopted basically unified flow formulas, blockage flow formulas, and sound prediction methods in design, manufacturing, and calculation. The nominal diameter, nominal pressure, leakage level, and end spacing of the regulating valve are all executed according to the EC standards. The connection between valve locators and other accessories and the regulating valve basically meets the standards, achieving universality and interchangeability. Analog and intelligent valve positioners have IEC61614 and IEC61514-2 standards, respectively.
The standardization work in the Chinese petroleum and petrochemical industry has been carried out relatively early, but it is customary to use the American ANSVISA standard and AP1 standard in the design of control valves. In fact, the flow calculation, blockage flow formula, leakage level, and testing of control valves in the American standard have already met or equivalent to the relevant IEC control network standards.
China began to fully adopt international standards in 2001. For industrial process control valve standards, they first adopted equivalent IEC60534 standards 1, 5, 7, 8-1, totaling 4 standards, with the standard number GB/T17213. Later, 13 standards of EC60534 were equally adopted, bringing the current GB/T17213 standard to 17. Some versions of these standards have been updated or revoked. GB/T221371-2008 and GB/T221892-2008, which are equivalent to C61514 and EC61514~2 for valve positioners, as well as GB/T4213-2008 "Pneumatic Adjustment".
The Chinese petrochemical industry standard SH3005-1999 "Design Specification for Selection of Automation Instruments in Petrochemical Industry" also provides standardized requirements for the design of control instruments. On the other hand, domestic regulating valve manufacturers have limited adoption of standards in their production, so there are not many products that meet the standards of auxiliary valves.
Despite this, there has been substantial progress in the standardization of industrial process control valves in China in recent years, with significant progress. Equivalent and equivalent IEC 60534 standards are beneficial for the research and development of Chinese control valve products, improving technological content, and expanding the market.
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Figure 1- Pneumatic diaphragm regulating valve
