Bellows structural characteristics of the valve

Bellows valves undergo a series of rigorous inspection and testing procedures. This includes 100% air tightness and leak-free testing. Vacuum requirements of the bellows, helium mass spectrometer leak detector can be tested for vacuum tightness. Structural characteristics of the bellows valve: 1. The valve body and the valve cover stud stud connection, simple structure, good process performance. 2. Bellows valve stem not only general valve stuffing box, and in the lower part of the stuffing box, the upper part of the valve chamber is equipped with a movable sealing element - stainless steel bellows, the medium is enclosed in the valve chamber outside the valve stem, Can not enter the stuffing box, so the valve is more reliable than the general valve to prevent leakage, to ensure that the valve stem and valve cover seal. 3. Stem nut surface nitriding, improve the surface hardness and wear resistance, prevent bite phenomenon. 4. Medium flange bolts made of high strength alloy steel, high temperature creep performance, safe and reliable. 5. Bellows design in the valve cover cavity, to avoid direct flushing with the media to improve the life of the bellows. 6. Corrugated pipe with 2 to 4 times the overlap, to prevent damage to the valve bellows single leak, to extend the life of the valve. 7.Because bellows design is relatively long, open a large height, reduce the main resistance of fluid, flow resistance coefficient is small. 8. Using packing and bellows double seal, to zero leakage.