Copper valve common faults and maintenance

Copper valve opening and closing with jamming, inflexible or not normal opening and closing, or even can not continue to open and close, mainly due to the valve stem and other parts jamming, mainly between the valve stem and packing jamming.

Generally have:
Packing gland skewed after touching the valve stem
--Treatment: correct installation
. Packing installation is not correct or too tight pressure
--Handling method: Packing pre-tighten, loosen packing properly.
Valve stem and packing gland bite
--Handling method: Replace or rework.
Biting or galling between parts
--Handling method: Properly lubricate the valve stem.
Valve sealing surface abrasion, stem light column part bite abrasion and stem thread part bite, etc..
Sealing surface grinding there are abrasive particles embedded in the sealing surface, not cleaned up, resulting in sealing surface abrasion; some by the use of the abrasive particles in the media under the scrubbing, abrasive particles discharged and stick in the sealing surface, by the valve switch, resulting in abrasion.
--Processing methods: reasonable choice of abrasives, sealing surface grinding must be cleaned.
Medium in the spoils or welding slag is not clean, resulting in abrasion.
--Handling method: re-cleaning clean.
Valve stem and packing pressure sleeve, packing pad touching, followed by the medium containing boron in the medium, after the leakage will crystallize to form hard particles, in the packing and stem contact surface, switching strained stem surface.
--Processing methods: correct installation, adjust the parts fit gap and improve the hardness of the valve stem surface. Trapezoidal threads are stained with dirt, poor lubrication conditions; stem and related parts deformation.
--Treatment: remove the spoils, apply lubricant to the high-temperature copper valves in time; correct the deformed parts.