Trunnion ball valves (also known as fixed ball valves) undertake key media control tasks in the industrial field with their unique bearing fixing structure and enhanced sealing design. The main uses are as follows:
1. High-pressure and ultra-high-pressure system control Energy mining
Oil drilling platform wellhead device: control 70MPa high-pressure crude oil/natural gas to prevent blowout accidents;
Natural gas transmission pipeline: ensure the safe cutoff and venting of high-pressure gas source (10~32MPa).
Energy conversion
Supercritical thermal power unit: adjust the flow of 550℃ high-temperature steam (＞25MPa);
Hydrogen energy storage and transportation system: ultra-low temperature (-196℃) sealing control of liquid hydrogen transmission pipeline.
2. Management of harsh media and extreme working conditions Highly corrosive fluids
Chemical reactor: chlorine, strong acid pipelines (using stainless steel valve body + alloy seal);
Synthetic ammonia production line: high-pressure ammonia water cutoff (pressure resistance 42MPa).
Medium containing solid particles
Metallurgical slurry transportation: V-shaped cut sphere shears slag particles to prevent blockage;
Papermaking slurry regulation: control the flow of fiber suspension and reduce valve seat wear.
High temperature environment
Metallurgical high temperature gas: 550℃ flue gas pipeline isolation (metal hard seal);
Petrochemical cracking unit: hot oil pipeline quick cut-off.
3. Safety-critical system isolation
Dual seal guarantee
DBB (double blocking and venting): valve cavity pressure relief to achieve upstream and downstream double isolation (such as hazardous chemical storage tanks);
DIB (double isolation and venting): single-seat bidirectional seal, suitable for nuclear power plant cooling system.
Intrinsically safe design
Inflammable and explosive environment: spark-free structure (pneumatic actuator drive) replaces electric valve;
Zero leakage requirement: aerospace fuel filling system (leakage rate <10⁻⁶ cc/sec).
4. Customized applications in special industries
Precision fluid control
Semiconductor ultrapure water: ferrule-type trunnion valve (316L electrolytic polishing) to avoid ion contamination;
Biopharmaceuticals: three-piece aseptic structure, supporting CIP online cleaning.
Space-constrained scenarios
Ship ballast tanks: compact trunnion valves replace gate valves to save installation space;
Underground oil and gas wells: small-diameter trunnion valves (DN15) remotely control downhole fluids.
