Tank car ball valve maintenance and precautions
Oil tanker ball valve is one of the most important accessories in China's petrochemical industry. Its simple operation and use, now introduced by Anlai Petrochemical, the maintenance and precautions of the tank valve.
Tank car ball valve maintenance and maintenance considerations
In order to make the tank car ball valve have a long service life and maintenance-free period, in addition to normal working conditions, maintaining a harmonious temperature / pressure ratio, and reasonable corrosion data, will also rely on the following attention factors:
â— Under the closed state of the ball valve, there is still a pressurized fluid inside the valve body.
â— Before servicing the ball valve, relieve the line pressure and leave the valve in the open position.
â— Disconnect the power or air supply before the tank valve is repaired.
â— Disconnect the actuator from the bracket before servicing.
â— It is necessary to first find out that the upper and lower pipes of the ball valve have been removed before the disassembly and decomposing operation. â— Decomposition and reassembly must be taken to prevent the sealing surface of the damaged parts. Especially for non-metallic parts, special tools should be used when removing the O-ring.
â— When the ball valve is assembled, the bolts on the flange must be tightened symmetrically, gradually and evenly.
â— 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 gas, the metal parts can be cleaned with gasoline. Non-metallic parts are cleaned with pure water or alcohol. â— Decomposed individual parts can be cleaned by dipping. Metal parts that have been left undecomposed by non-metallic parts can be scrubbed with a clean and fine cloth impregnated with a cleaning agent (to prevent the fibers from falling off and sticking to the parts). During cleaning, remove all grease, dirt, glue, dust, etc. adhering to the wall. â— Non-metallic parts should be taken out of the cleaning agent immediately after cleaning. Do not soak for a long time. â— After cleaning, the wall cleaning agent should be evaporated. (It can be rubbed with silk cloth without dipping agent), but it should not be left for a long time, otherwise it will rust and be polluted by dust. â— New parts need to be cleaned before assembly.
â— Lubricate with grease. Grease should be compatible with ball valve metal materials, rubber parts, plastic parts and working media. When the working medium is gas, for example, special 221 grease can be 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 and friction surface of the valve stem. Debris, fiber, grease (except for the use of specified) dust and other impurities, foreign matter, etc., contaminate, adhere or stay on the surface of the part or enter the cavity
1), the packing is relocked
If there is a micro-bleed at the packing, the stem nut must be locked. Note: Do not lock too tightly, usually lock 1/4 turn to 1 turn, the leak will stop.
2), replace the seat and seals
A) Disassembly <br> Put the valve in the half-open position to flush and remove dangerous substances that may exist inside and outside the valve.
Close the ball valve, remove the connecting bolts and nuts on the flanges on both sides, and then completely remove the valve from the line.
Disassemble the drive unit-actuator, connecting bracket, lock washer, stem nut, butterfly shrapnel, Grennan, wear plate and stem packing.
Remove the body cover connecting bolts and nuts, separate the bonnet from the valve body, and remove the bonnet gasket.
Verify that the ball valve is in the "off" position, which allows it to be easily removed from the valve body and then the seat is removed.
Push the valve stem down from the hole in the valve body until it is completely removed, then remove the O-ring and the stem under the valve.
Note: Be careful to avoid scratching the stem surface and the body packing seal.
B), reassembly
Tank valve cleaning and inspection to remove parts, it is strongly recommended to replace the seals such as seat and bonnet gasket with spare parts kit.
Assemble in the reverse order of disassembly.
Use the specified torque to cross-lock the flange connection bolts.
Lock the stem nut with the specified torque.
After installing the actuator, input the corresponding signal to rotate the spool through the rotary valve stem to open the valve to the open and closed positions.
If possible, perform a pressure seal test and performance test on the valve in accordance with relevant standards before returning the pipe.
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