Case
Case
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
body.
| 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 |
