1.密封放在气缸内而不是活塞上。更长的行程的执行机构和快门将实现,授予更高的流量(更少的流动损失)。密封磨损少。2.在303 S.S.先导头插入相当大的提高耐腐蚀性由外部药剂造成。3.从DN63金属活塞开始,化学镍涂层(10-15微米)。减少磨损的活塞由于达到更大的表面硬度(700-750 HV)。4. Seals pre-loaded by spring. Guarantee of the recovery of the gap due to the wear caused by the sliding of the shaft avoiding leakage towards the outside part. Allow to maintain energized the "chevron" seals (V) compensating the dimensional changes even in case of huge temperature excursions. 5. CHEVRON seals (V shape) with 5 seals in the lower part of the spring and 3 seals in the upper part. It ensures a perfect tightness even after a high number of cycles 6. Rolled shaft. Less wear of the seals due to the low roughness (0,1 micron Ra) which facilitate the sliding of the shaft. 7. Longer face to face. Better fluidodynamic with reduction of the turbulences. 8. Oscillating / self-aligning shutter. It fits perfectly to the valve body ensuring the maximum tightness. ATEX Certificate. Installation is allowed in a potential explosive environment. PED Certificate. Full compliance with European Safety Standards for Pressure Equipment.