From Factory Test Passed to On-Site Leakage | Why Ball Valves Can Fail After Actuator Assembly
Ball valve leaving factory qualified but on-site leakage often due to installation stress leads to valve body deformation >0.3mm, actuator torque amplified 20% damages seal or medium contains particles >50μm scratches sealing face, suggest re-check coaxiality ≤0.5mm, re-set torque and flush pipeline after then put into use. misalignment Geometric deviation A unit DN100’s carbon steel […]
Installed the Actuator, Then the Ball Valve Started Leaking | 3 Mistakes Customers Often Don’t Notice
Installation actuator after valve leakage mostly due to torque setting error (deviation >10%), valve stem coaxiality offset >0.5mm or not reset stroke limit, suggest re-calibrate actuator switch position, detect connection bracket parallelism ≤0.2mm, and at 0.6MPa under do sealing test confirm leakage point. mounting errors Valve stem packing leakage Workshop’s tap water pipe pressure stops […]
How to Avoid Common Problems When Installing a Ball Valve in the Field | Installation Alignment and Seal Protection
Installing ball valve when need guarantee pipeline coaxiality deviation ≤ 1mm, flange parallelism error ≤ 0.2°, avoid forced alignment produce stress; Sealing face installation before use non-woven fabric dip alcohol clean, prohibit scratching, bolts according to diagonal sequence divided 3 times tighten to rated torque 100%, test pressure controlled within 1.5 times working pressure inside, […]
What to Do Before and After Ball Valve Installation on Site | Pre-Installation Preparation and Post-Installation Testing
Ball valve before installation should check specification and pressure grade, perform appearance and sealing face inspection and use 0.5MPa air pressure pre-test no leakage, clean pipeline impurities; after installation according to 1.25 times working pressure perform water pressure test 10 minutes, allow trace leakage ≤ standard value, at the same time check opening/closing torque change […]
Ball Valve On-Site Installation: Key Points for Trouble-Free Use | Installation Positioning and Post-Installation Inspection
Ball valve field installation needs to ensure horizontal or vertical direction deviation is less than 1°, flange bolts according to diagonal divided into 3 times evenly tightened to 100% of design torque, before installation clean pipeline impurities, pigging test ensures unobstructed, after installation with 1.1 times working pressure perform sealing test, leakage rate must be […]
How Manufacturers Conduct API 607 Fire Tests for API 6D Ball Valves | Testing Procedures, Quality Assurance, and Fire-Safe Validation
The manufacturer conducts a fire test on API 6D ball valves according to API 607, pressurizing the valve to 75% of the rated pressure, burning it in a 750–1000°C flame for 30 minutes, during which the leakage is continuously monitored not to exceed the specified value, and after cooling, seal and operating torque tests are […]
What Documents Are Needed for API 607 Fire Testing of API 6D Ball Valves | Required Documentation and Certification Requirements
For API 6D ball valves to undergo API 607 fire resistance testing, design drawings, material certificates (EN10204 3.1), pressure rating and dimensional data, test procedures, instrument calibration certificates and type test reports must be provided. The test is usually conducted under a 650°C flame for 30 minutes, and leakage rate and sealing performance are recorded, […]
How to Pass API 607 Fire Testing with an API 6D Ball Valve Design | Fire-Safe Design Optimization and Leakage Control
Adopt metal + soft seal dual structure, after fire burn metal seal leakage ≤ 100 ml/min;Packing select graphite withstand temperature ≥ 700℃;Valve seat add spring compensation structure, ensure after thermal deformation still fit;Conduct API 607 full process fire test and cold state re-test verification. design optimization Dual Sealing Mechanism When inside pipe pressure reaches 10 […]
What Inspection Items Matter Most When Buying an Industrial Ball Valve | pressure testing, surface finish, dimensional accuracy
When purchasing industrial ball valves, focus on verifying that the hydrostatic test reaches 1.5 times the design pressure, the pneumatic sealing test shows zero leakage, the sealing surface finish is controlled to ≤ Ra 0.8 μm, and critical dimensional tolerances are held within ±0.05 mm. The opening and closing torque and concentricity should also be […]
What Causes Industrial Ball Valve Failure in Harsh Working Conditions | seal wear, pressure fluctuation, material mismatch
Industrial ball valves in severe service most often fail because seal wear exceeds 0.2 mm/year, pressure fluctuations go beyond ±20% of the design value, or materials are mismatched. In H₂S-containing service, for example, failing to use duplex stainless steel can sharply accelerate corrosion. During operation, torque variation should be monitored regularly; if it rises by […]
