①Handwheel, handle operated globe valve can be installed in any position of the pipe.
②Handwheel, handle and fretting mechanism are not allowed for lifting.
③The flow direction of the medium should be consistent with the arrow direction shown by the valve
|Common faults||Common faults||Exclusion methods|
|Cut-off valve Cover Leakage||The media flow is not correct, erosion sealing surface||Installed by flow arrow or in structural form, i.e. medium introduced from under the seat (except for individual design medium introduced from the sealing surface, the seat flows down)|
|Cut-off valve surface seal surface easy to deposit dirt||When closed, leave a slit to wash several times before closing|
|Different heart of valve cone seal pair||Proper assembly, stem, disc or throttle, seat on the same axis, stem bending straight|
|Damage and aging of sealing surface of valve liner||Check and replace linings regularly so that the closing force is appropriate to avoid crushing the sealing face of the globe valve|
|Stop valve failure||Pin valve plugging||The globe valve is not suitable for medium with high viscosity|
|Valve blocked by foreign body||Remove or disintegrate globe valves|
|Damage to internal stem nut or stem trapezoidal thread||Improper selection, corrosion by medium, should be correctly selected valve structure type; small operating force, especially small globe valve and throttle valve; trapezoidal thread damage should be replaced in time|
|Disc, throttling cone||Corrosive medium should avoid rolling, steel wire connection closing valve, closing parts should be repaired after falling off, steel wire should be changed to stainless steel wire|
|Stop valve throttle||The ruler is not zero and the ruler is lost||The ruler should be adjusted to zero and repaired and repaired after loosening or missing|
|Severe erosion of throttle cone||Correct material selection and heattreatment, flow direction should becorrect, operation should be correct|