1. Ball valve composition: it is composed of flange ball valve, actuator, bracket and connecting shaft. 2. Temperature and pressure limits 1. The working temperature of the valve is limited by the working temperature of the valve body, seat and seal, which shall be determined according to the valve body and seat. The minimum temperature in the seal is the operating temperature of the valve. 2. The rated pressure class (PN) of the valve indicates the maximum working pressure of the valve under normal temperature. The name plate indicates the maximum allowable working pressure of the ball valve under the maximum and minimum working temperature. 3. Please refer to the corresponding manual for the precautions of electric or pneumatic actuator. 3. Installation of ball valve 1. This kind of valve should be installed in the horizontal or vertical direction of the pipeline. 2. Remove the protective covers on both sides of the flange end before installation, and clean it when the valve is fully opened. 3. Before installation, the whole machine should be tested according to the specified signal (electricity or gas) (to prevent vibration caused by transportation). After passing the test, it can be installed on the line (wiring according to the electric actuator circuit diagram). 4. During installation, do not use the actuator part of the valve as the lifting point to avoid damaging the actuator and accessories. 0.5。 The pipe near the installation point shall not sag or be subjected to external force. Pipe supports or supports can be used to eliminate deviations in the pipe. 6. Before preparing to connect with the pipe, flush and remove the residual impurities in the pipe (these materials may damage the valve seat and ball). 7. After connecting with the pipeline, cross tighten the flange connecting bolts with the specified torque. 4、 Operation and use of ball valve 1. Before operation, make sure that the pipeline and valve have been flushed. 2. When the direction indication arrow of the actuator is parallel to the pipeline, the valve opens; when the direction indication arrow is perpendicular to the pipeline, the valve closes. 3. The operation of the valve is completed by the actuator to rotate the stem: when the valve is rotated 1 / 4 turn (90 °) clockwise, the valve closes. When the valve is turned 1 / 4 turn (90 °) counterclockwise, the valve opens. 5. When repairing and repairing the ball valve, it should be noted that when the ball valve is closed, there is still pressurized fluid in the valve body. Before maintenance, disconnect the power or air supply, release the line pressure and keep the valve in the open position. If there is slight leakage in the locking culvert, the removal actuator and connecting bracket must be locked on the stem nut. Be careful not to lock too tightly, usually 1 / 4 turn 1 turn, the leakage will stop. 2. Replace the valve seat and sealing ring: disassemble, replace and reassemble (a), be careful during disassembly and disassembly to avoid scratching the valve stem surface and the seal of valve body (1). Keep the valve in the half open position. Flush and remove any hazardous substances that may exist inside and outside the valve. 2) Close the ball valve, remove the connecting bolts and nuts on the flanges on both sides, and then completely remove the valve from the pipeline. 3）。 Remove the drive unit actuator, connecting bracket, lock washer, stem nut, butterfly spring, wear plate and stem packing (4). Remove the connecting bolts and nuts of the valve body and bonnet. The bonnet is separated from the body and the bonnet gasket is removed. 5）。 Remove the connecting bolts and nuts of the valve body, take out the ball core and valve stem, and then take out the valve seat. B) Replace, clean and inspect to remove parts, replace seat and bonnet gasket with damaged sealing ring. C) , reassemble 1). If possible, please perform pressure seal test and performance test on the valve according to relevant standards before reloading the pipeline. 2）。 Assemble in the reverse order of disassembly. 3）。 Cross lock the flange connection bolts with the specified torque. 4）。 Lock the stem nut with the specified torque. 5）。 After installing the actuator, input the corresponding signal and rotate the valve core by rotating the valve stem to open and close the valve. Pneumatic valve manufacturer/