Knowledge

Inspection and maintenance of ball valve



Inspection and maintenance of ball valve


The specific steps are as follows;

Step 1: Disconnect the power and air supply;

         Step 2: release the upper and lower pipeline pressure of the ball valve and leave the valve in the open position;

         Step 3: Disengage the actuator from the bracket;

         Step 4: Disassemble the internal parts; care must be taken to prevent the sealing surface of the damaged parts during disassembly and reassembly, especially for non-metallic parts. When removing the O-ring, the corresponding special tool should be used to prevent the damage of the seal.

         Step 5: Parts cleaning method;

         The cleaning agent should be compatible with the rubber parts, plastic parts, metal parts and working medium in the ball valve. When the working medium is gas, the metal parts can be cleaned with gasoline.

         The individual parts that are broken down 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 (the fibers should be prevented from sticking to the parts). When cleaning, remove all grease, dirt, glue, dust, etc. that adhere to the wall.

         Non-metallic parts are cleaned with purified water or alcohol. Immediately after cleaning, remove it from the cleaning agent and do not soak for a long time. After cleaning, the wall cleaning agent needs to be volatilized (can be wiped with a silk cloth that is not dipped in cleaning agent).

         Step 6: Some newly replaced parts should be cleaned before assembly; they should be lubricated with grease and should be compatible with ball valve metal materials, rubber parts, plastic parts and working medium. When the working medium is gas, the reference 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, and apply a thin layer of grease to the sealing surface and friction surface of the valve stem.

         Step 7: Carry out the assembly in time; do not leave it for a long time to prevent the parts from rusting and being polluted by dust. Metal debris, fibers, grease (except for the use), dust and other impurities, foreign matter, etc. must not be adhered during assembly. Contamination, stay on the surface of the part or enter the cavity.

         Step 8: The bolts on the flanges on the assembled ball valve must be tightened symmetrically, stepwise and evenly to prevent loosening and unnecessary manual maintenance costs.