Specification and interpretation of valve type and letter code

The valve is an important equipment in the fluid conveying system, which is used to control the flow rate, flow direction, pressure, temperature and other parameters of the fluid to ensure the normal operation of the fluid conveying system. The valve type and its letter code are important signs of valve performance, structure, material and use information. This article will interpret the valve model and its letter code from a professional point of view.
First, the composition of the valve model
The valve model is composed of seven parts, in turn: class code, transmission code, connection code, structure code, material code, working pressure code and valve body code. These seven parts are represented by letters and numbers, of which the class code, transmission code, connection code, construction code and working pressure code are required, and the material code and valve body code are optional.
Second, the valve letter code provisions and interpretation
1. Class code: Class code indicates the use and function of the valve, with the letter “G” for general purpose valves, “P” for petroleum and chemical valves, “H” for ship valves, “Y” for metallurgical valves, etc.
2. Transmission code: transmission code indicates the operation mode of the valve, with the letter “M” for manual, “Q” for pneumatic, “D” for electric, “F” for hydraulic, “B” for electro-hydraulic, etc.
3. Connection form code: Connection form code indicates the connection mode of the valve, with the letter “B” for threaded connection, “G” for welded connection, “R” for flange connection, “N” for threaded flange connection, etc.
4. Structural form code: structural form code indicates the structural characteristics of the valve, expressed by letters and numbers. For example, the structural form code of gate valve is “Z”, the structural form code of butterfly valve is “D”, the structural form code of ball valve is “Q” and so on.
5. Material code: Material code indicates the main parts of the valve material, represented by letters. For example, the material code of carbon steel valve is “C”, the material code of stainless steel valve is “S”, the material code of cast steel valve is “Z” and so on.
6. Working pressure code: The working pressure code indicates the maximum working pressure allowed by the valve under normal working conditions, expressed by letters and numbers. For example, a valve with a working pressure of 1.6MPa has a working pressure code of “16″.
7. Valve body form code: valve body form code indicates the valve body structure form, represented by letters. For example, the through valve body form code is “T”, the Angle through valve body form code is “A” and so on.
Third, the interpretation of the valve model and its letter code
Taking a commonly used gate valve model “Z41T-16C” as an example, the interpretation is as follows:
- “Z” indicates that the valve category is general purpose valve;
- “4″ indicates the transmission mode is manual;
- 1 indicates that the connection is welded.
- “T” indicates that the structure is a gate valve;
- “16″ indicates that the working pressure is 1.6MPa;
- “C” indicates carbon steel.
Through the above interpretation, you can clearly understand the category of the gate valve, transmission mode, connection form, structural form, working pressure and material information.
Iv. Conclusion
The specification of valve type and its letter code is an important technical specification of the valve industry, which is of great significance to ensure the standardization and interchangeability of the design, manufacture, selection and use of valve products. Understanding the valve type and its letter code specification and interpretation method helps to correctly select and use the valve to ensure the safe, reliable and efficient operation of the fluid delivery system.