1. 1 buried all welded ball Industrial Valves before installation pressure pipeline valve before installation should be pressure test, in order to ensure the rigor and security of the Industrial Valves itself. ( 1) Strength test. Strength test using water as medium; The Industrial Valves on both sides of the sleeves on welding high pressure - Booster to ball valve nominal pressure of 1. Five times the pressure maintaining 15 min; As a qualified without leakage. ( 2) Leak test. Tight. some trials using nitrogen as medium; Pressure to ball valve nominal pressure of 1. Insert depth to 1 cm; No air bubbles in the 5 min for qualified. 1. Installation (2 1) Hoisting. Should adopt the way of correct lifting the valve, for the sake of protection valve rod, don't tie chain hoist in hand wheel, gear box, or actuators. ( 2) Weld quality must conform to the plate bending melting welding joint radiography ( GB3323— 2005). Ⅱ level standard, usually a welding cannot fully guarantee all qualified, so on both ends of the valve when the valve should be required to manufacturer to order 1. ( 3) shaft lining. Realization of direct buried after laying small valve hand well, as shown in figure 4. While for routine of full welded ball valve can not be directly buried, and laying a large valve well, only to form the dangerous confined Spaces, unfavorable to safety operation. 2. ( 1) Open/close time requirements. And make the damage to the valve stem; According to experience, the switching time of the valve, Number of seconds) The scope of control, lower limit can be according to the size of the valve nominal ( Inches) Half of the ceiling can be according to the size of the valve nominal ( Inches) ( 2) Valves in the operation of state called, valve ball should be fully open or close, may not be in a half-open or closed position, so as to avoid the seat damage. 2. Auxiliary gas main valve adjustment, it tends to be short should switch at least once a year and into the right amount of grease, prevent the ball and seat agglutination and valve ball and seat between grinding. Buried type full welded ball valve good technical characteristic wave makes the whole gas pipeline but one ( All welded together) To enhance the pipe ( Including valves) The overall stress resistance, resistance to geological disasters, Such as geological subsidence) reliability life extension, installation and maintenance is very convenient.
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