How to Choose a Natural Gas Ball Valve
Selecting a natural gas ball valve requires consideration of multiple factors, including medium characteristics, operating environment, pressure rating, and safety requirements. Here’s a detailed guide:
1. Valve Material
Body Material: Carbon steel (WCB), stainless steel (304/316), or alloy steel, depending on the working environment and corrosion resistance requirements.
Seal Material: PTFE (polytetrafluoroethylene), PPL, or metal-seated options, chosen based on temperature, pressure, and sealing performance.
2. Pressure Rating
Common pressure ratings: PN16, PN25, PN40, 150LB, 300LB, etc.
The selection should match the pipeline system’s operating pressure.
3. Connection Type
Flanged (suitable for high pressure, large diameters): Complies with GB, ANSI, DIN, JIS standards.
Threaded (used for low-pressure, small-diameter pipelines).
Welded (suitable for high-pressure, high-temperature conditions, offering better leakage prevention).
4. Valve Type
Floating Ball Valve: Used for low to medium pressure applications (≤PN40) and smaller diameters.
Trunnion-Mounted Ball Valve: Suitable for high-pressure, large-diameter conditions with bi-directional sealing.
V-Port Ball Valve: Ideal for flow control applications.
Full Bore / Reduced Bore: Full bore allows maximum flow, while reduced bore saves cost and weight.
5. Actuation Method
Manual (handle or gear-operated).
Pneumatic (quick opening/closing, used in automated systems).
Electric (remote control capability).
6. Special Requirements
Fireproof & Antistatic Design (prevents fire hazards and static discharge).
Explosion-Proof (for hazardous environments).
Low-Temperature Design (for LNG applications).
Pipeline Ball Valve (e.g., buried type for long-distance transmission).
When choosing a natural gas ball valve, consider the specific working conditions, budget, and safety requirements. Refer to industry standards like API 6D and GB/T 12237 to ensure safety, reliability, and efficiency.
