Standard Range of Ball Valve Pressure Capacity
The pressure capacity of a ball valve is typically expressed in pressure ratings (PN or Class). The specific value depends on the valve's design standard, material, and intended use. The following are common pressure ranges:
1. National Standard (GB/T 12224):
- Low-pressure ball valves: PN6-PN16 (0.6-1.6 MPa), suitable for general water and gas systems.
- Medium- and high-pressure ball valves: PN25-PN100 (2.5-10 MPa), commonly used in petroleum and chemical pipelines.
- Ultra-high-pressure ball valves: PN160-PN420 (16-42 MPa), used in specialized industrial applications such as high-pressure steam or hydrogen transportation.
2. American Standard (ASME B16.34):
- Class 150 (2.0 MPa), Class 300 (5.1 MPa), to Class 2500 (42.2 MPa). These values represent the maximum operating pressure at room temperature.
Professional References:
- National Standard data is referenced from "GB/T 12224-2015 General Requirements for Steel Valves";
- American Standard data is referenced from ASME B16.34-2020.
Key Factors Affecting Ball Valve Pressure Capacity
1. Material Selection:
- Cast iron ball valves (such as HT250) are generally limited to pressures below PN16;
- Stainless steel (304/316) can withstand pressures above PN40;
- Alloy steel (such as F51 duplex steel) is suitable for high-pressure environments above Class 1500.
2. Structural Design:
- Floating ball valves have a lower pressure capacity (generally ≤ Class 600), while fixed ball valves, due to their more stable support structure, can reach Class 2500.
3. Sealing Technology:
- Soft seals (PTFE) are suitable for medium and low pressures (PN16-Class 300), while metal seals (such as carbide) have higher pressure resistance.
How to Select a Ball Valve with the Appropriate Pressure Based on Your Requirements
1. Clarify operating parameters: including media type (corrosive, particulate), temperature (high temperatures reduce pressure capacity), and pipeline design pressure.
2. Reference Standard Matching:
- Civilian water supply systems: PN10-PN16;
- Long-distance oil and gas pipelines: Class 600-Class 900;
- Nuclear power or supercritical units: Custom valves of Class 2500 or higher are required.