Should pay attention to those aspects of the problem on the ball valve repair, maintenance

To the ball valve has a long service life and maintenance-free period, in addition to normal operating conditions, power station valve, to maintain the harmonious temperature / pressure ratio, and corrosion data will rely on to do the following few pay attention to the factors:

In the valve closed state, the internal body is still there is a pressure fluid.
· Maintenance of ball valves, lifting the line pressure and the valve in the open position.
The ball valve before servicing, disconnect the power or gas source.
· Maintenance, implementing agencies and the bracket from.

Must first identify the valve on the downstream pipeline has indeed removable pressure in order to disassemble the operation
Decomposition and re-assembly must be careful to prevent damage parts of the sealing surface, especially non-metallic parts should use a special tool, remove the O-ring

· Ball valve assembly bolts on the flange must be symmetrical, gradually and evenly tightened.
Cleaners should be compatible with the ball valve in the rubber parts, plastic parts, metal parts and the working medium (such as gas), etc.. Working medium for the gas can be used gasoline to clean metal parts. Non-metallic parts with pure water or alcohol
Break down the individual parts can be used way immersion cleaning. Still left not break down the non-metallic parts of the metal parts can be used to clean fine clean silk cloth impregnated with a cleaning agent to scrub (in order to avoid fiber shedding adhesion in part). Cleaning required to remove all the adhesive on the wall, grease, dirt, product plastic, dust, etc.
· Non-metallic parts after cleaning should be immediately removed from the cleaning agent, not a long soak
· After cleaning needed to be washed wall volatile cleaning agent (available not dip the silk of the cleaning agents wipe) for assembly, but not long time on hold, otherwise it will rust, dust pollution
· New parts in the assembly also need clean water

Use of grease lubrication. Greases are compatible with the ball valve metal materials, rubber parts, plastic parts and the working medium. Working medium for the gas can be used, for example, special 221 grease. Coated with a thin layer of grease seals installed in the groove on the surface, coated with a thin layer of grease on the rubber seals, valve stem sealing surface and the friction surface coated with a thin layer of grease
· Assembly should not allow metal debris, fibers, grease, dust and other impurities, foreign bodies (except for the requirement to use) contamination, adhesion or remain in part on the surface or into the cavity

1), the padding and then lock

If the packing at the micro-vent, to be re-locking stem nut. Note: do not lock tight, usually re-lock 1/4 turn to a circle, the leak will stop.

2), replacement of the valve seat and seals

A), demolition
Valve in the half-open position, rinse, remove the valve body inside and outside the hazardous substances that may exist.
Close the valve, disconnect the connection on both sides of the flange bolts and nuts, then completely remove the valve from the pipeline.
Order to remove the drive - the executing agency, the connection bracket, lock washers, stem nut, butterfly shrapnel, Glam, wear-resistant piece of stem packing.
Remove the body cover bolts and nuts, and separation of the valve cover and valve body and remove the valve cover gasket.
Confirm the ball valve in the "off" position, which can be more easily out of the body, then remove the seat.
Nudge by the valve body bore down the stem until it is completely removed, then remove the O-ring and stem packing.
Note: Please exercise caution to avoid scratches the stem surface and the valve stuffing box sealing parts.

B), re-assembly
Cleaning and inspection to remove the parts, it is strongly recommended spare parts package to replace its valve seat and valve cover gaskets and other seals.
Be assembled in the reverse order of removal.
The specified torque, cross-locking flange bolts.
The specified torque, tighten the stem nut.
Executive body is installed, enter the appropriate signal to the drive spool rotation by rotating the valve stem, the valve to open and closed position.
If possible, back to the installed pipe, the valve pressure seal test in accordance with relevant standards and performance testing.

keywords: Ball valve, the working medium, cleaning agents, metal parts, decomposition,