How to deal with powder leakage of butterfly valve for pneumatic train? According to the requirements of the European Community Structural Integrity Assessment Method (SINAP), Tianjin University applied the CTOD test method to assess the safety of submarine oil and gas pipelines, and made a positive conclusion based on the test results.
3. Classification according to sealing form
(1) Forced sealing butterfly valve. 1) Resilient sealing butterfly valve. The sealing specific pressure is generated by the elasticity of the valve seat or valve plate when the valve plate squeezes the valve seat when the valve is closed. 2) Applied torque sealed butterfly valve. The sealing pressure is generated by the torque applied to the valve shaft.
(2) Pressurized and sealed butterfly valve. The sealing specific pressure is generated by charging the elastic sealing element on the valve seat or valve plate.
(3) Automatic sealing butterfly valve. The sealing pressure is automatically generated by the medium pressure.
