All welded ball pneumatic valve, buried all welded ball type pneumatic valve how to test and installation

pipeline welding pneumatic ball valve (all Buried all welded ball pneumatic valve) Before installation should be pressure test to ensure the rigor and security of the pneumatic valve itself.
. All welded ball pneumatic valve testing:
( Strength test, strength test using water as medium; In pneumatic valve on both sides of the sleeves on welding and pressure - Booster to the pneumatic ball valve of the nominal pressure. Times, the holding min; As a qualified without leakage.
　
( Leak test: close. some trials using nitrogen as medium; Pressure to the pneumatic ball valve of the nominal pressure. Insert depth of cm; No air bubbles in the min for qualified.
. Install
( Lifting: should adopt the way of correct lifting pneumatic valve, in order to protect the pneumatic valve stem, don't tie chain hoist in hand wheel, gear box and actuators.
( Weld quality must conform to the plate bending melting welding joint radiography ( GB— Ⅱ level standard, usually a welding cannot fully guarantee all qualified, so when ordered pneumatic valve manufacturers in the pneumatic valve should be required to increase on both ends. M long sleeve tube, once the unqualified weld has enough length to unqualified weld mutilation in pneumatic ball valve and pipe welding and welding, pneumatic valve % should be in full open position, so as to avoid pneumatic valve ball damaged by splashing slag, while ensuring the pneumatic valve internal seal temperature not to exceed degrees Celsius, can take the appropriate cooling measures when necessary.