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Applications of Square Wall Lights
Analysis of Technical Parameters of Multi-Function Pump Control Valve
**Abstract:** This standard outlines the technical specifications for multi-function water pump control valves, applicable to devices with nominal pressure ranging from PN1.0MPa to PN4.0MPa and nominal diameters between DN50mm and DN1200mm. The standard covers key aspects such as pressure-temperature ratings, structural design, material selection, and performance requirements to ensure safe and efficient operation in various applications.
**Pressure-Temperature Class**
The pressure-temperature rating of a multi-function water pump control valve is determined by the pressure resistance of the housing, internal components, and the control piping system, along with the temperature class of the materials used. The maximum allowable working pressure at a given temperature is the lowest value among the housing, internal parts, and control pipe system's allowable pressures at that temperature.
For cast iron casings, the pressure-temperature class must meet the requirements of **GB/T 17241.7**, while for steel casings, it should comply with **GB/T 9124**. If these standards do not specify particular pressure-temperature classes, the relevant industry standards or design codes should be followed.
**Valve Body**
The flanges of the valve body should be cast integrally with the body itself. For cast iron flanges, the type and size must conform to **GB/T 17241.6**, with technical conditions following **GB/T 17241.7**. For steel flanges, **GB/T 9113.1** governs the dimensions, while **GB/T 9124** sets the technical requirements.
The minimum wall thickness for cast iron bodies should follow **Table 3 of GB/T 13932-1992**, and for cast steel bodies, **Table 1 of JB/T 8937-1999** applies.
**Bonnet and Diaphragm Seat**
The bonnet and diaphragm seat, as well as the connection between the diaphragm seat and the valve body, should be flanged. At least four connecting bolts are required between the diaphragm seat and the valve body. The minimum wall thickness of the bonnet and diaphragm seat should adhere to **Section 2.3** of the standard.
The flanges on the bonnet and diaphragm seat should be round, with sealing surfaces available in flat, convex, or concave types.
**Valve Stem, Slow-Closing Valve Plate, and Main Valve Plate**
The slow-closing valve plate must be securely and reliably connected to the valve stem. Both the slow-closing and main valve plates should use metal seals for optimal performance. The main valve plate and stem must operate smoothly and reliably, with the main valve plate and seat capable of using either metal or non-metallic seals depending on the application.
**Diaphragm**
The diaphragm must meet the performance criteria outlined in **Table 2** (see next page). Its appearance quality should comply with **HG/T 3090**, and if used in drinking water systems, the material must satisfy **GB/T 17219** for safety and health compliance.
**Control Tube System**
All components of the control tube system must be able to withstand the maximum operating pressure of the valve without leakage in any part.
**Materials**
Main components and materials should be selected according to **JB/T 5300**. Specific material standards include:
- Copper alloy castings: **GB/T 12225**
- Gray cast iron: **GB/T 12226**, with tensile strength ≥ 200 MPa
- Ductile iron: **GB/T 12227**
- Carbon steel: **GB/T 12229**
- Austenitic stainless steel: **GB/T 12230**
The surface quality of steel castings should meet **JB/T 7927**, and similar standards apply to iron castings.
**Shell Strength**
The shell strength of the valve must meet the requirements of **GB/T 13927**.
**Sealing Performance**
The sealing performance of the valve must also comply with **GB/T 13927**.
**Cleanliness**
The internal cleanliness of the valve should follow **JB/T 7748**.
**Painting**
If used in drinking water systems, the coating material inside the valve chamber must meet **GB/T 17219**. The outer surface paint is not specified unless otherwise stated in the contract.
**Conclusion**
This standard ensures that multi-function water pump control valves are designed, manufactured, and tested to meet rigorous technical and safety requirements, making them suitable for a wide range of industrial and municipal applications.