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Installation method and precautions of large diameter welding ball valve and electric welding ball valve

Large diameter electric welding ball valve installation methods, precautions and how to do the following statement:
Installation Precautions:
1) large diameter electric welding ball valve in the operation and installation must be confirmed before the pipeline and the valve has been washed to avoid the debris, affecting the use of the valve effect.
2) Operation of the valve actuating the actuator input signal size Driving the stem rotation is completed: When the forward rotation is 1/4 turn (90 °), the valve is turned off. When the reverse rotation is 1/4 turn (90 °), the valve opens.
3) When the actuator direction indicator arrow is parallel to the pipeline, the valve is open; when the arrow is perpendicular to the pipeline, the valve is closed.
Has a long service life and maintenance-free period, will depend on the following factors: normal working conditions, maintain a harmonious temperature / pressure ratio, and reasonable corrosion data
● The ball valve in the closed state, the valve body is still inside the pressurized fluid
● Before servicing, release the line pressure and keep the valve in the open position
● Disconnect the power supply or air supply before servicing
● Disassociate the actuator from the stand before servicing
● must first identify the ball valve, the downstream pipeline has been unloading pressure, in order to disassemble the decomposition operation
● When handling and disassembling, care must be taken to prevent the sealing surface of the damaged parts, especially non-metallic parts. When removing the O-ring, use special tools
● The bolts on the flange must be symmetrical, stepwise and evenly tightened
● The cleaning agent should be compatible with the rubber parts, plastic parts, metal parts and working medium (such as gas) in the ball valve. When the working medium is a gas, the metal parts can be cleaned with gasoline (GB484-89). Non-metallic parts are washed with pure water or alcohol
• Separate individual parts can be cleaned by dip. Metal parts that are left with undecomposed non-metallic parts can be scrubbed with a clean, fine, dipped silk cloth (to prevent fiber from falling off on the part). Cleaning to remove all adhere to the wall of the grease, dirt, plastic, dust and so on
● Non-metallic parts should be removed immediately after cleaning from the cleaning agent, not a long time soaking
● After cleaning, it needs to be washed with a wall cleaning agent (can be wiped with a cloth that is not soaked with a cleaning agent), but it will not be allowed to stand for a long time, otherwise it will rust and dust
● New parts should also be cleaned before assembly
● Use grease to lubricate. Grease should be compatible with ball valve metal material, rubber parts, plastic parts and working medium. When the working medium is gas, for example, special gas is used. Apply a thin layer of grease to the surface of the seal mounting groove, apply a thin layer of grease to the rubber seal, apply a thin layer of grease to the sealing surface of the stem and the friction surface
● Do not allow metal debris, fiber, grease (except for the use of) dust and other impurities, foreign matter and other pollution, adhesion or stay on the surface of the parts or into the cavity.