紧凑的锻钢
波纹管密封阀门
零泄漏
COMPACT FORGED STEEL
BELLOWS SEAL VALVES
ZERO LEAKAGE

阀门设计参数
VALVE DESIGN PARAMETERS

• 如果因为流体介质有毒、具有化学腐蚀性、放射性、其它健康或生态原因，任何泄漏都是不容许的，那么阀杆外壳的波纹管密封就是一个理想的选择。此外，对阀体-阀帽密封部位进行密封焊接使得阀门具有气密性密封性能。波纹管是焊接到阀杆和阀帽底部。Velan从1950年代开始，在波纹管密封技术领域一直处于领先地位。
  A valve with a bellows to seal off the stem enclosure is an ideal choice whenever leakage to the atmosphere is intolerable due to toxicity, chemical corrosion, radioactivity, other health or ecological reasons. In addition, seal welding the body-bonnet seal makes the valve hermetically sealed. The bellows is welded to the stem and to the bottom of the bonnet. Velan has been a leader in bellows seal valves since pioneering the technology in the 1950s.

循环寿命
CYCLE LIFE

• 波纹管的轴向运动限制在净长度的20-25%以内，取决于压力-温度和所期望的循环寿命。Velan波纹管设计寿命为DN15-DN50截止阀10,000次，无盖截止阀5000次，DN15-DN50闸阀3000次。
  Axial movement of the bellows is limited to a maximum of 20–25% of the free length, depending on pressure-temperature and desired life cycle. Velan bellows are designed for 10,000 cycles for 1/2–2” (15–50 mm) globe valves, 5000 cycles for bonnetless globe valves and 3000 cycles for 1/2–2” (15–50 mm) gate valves.
• 伸展度为50%，压缩度为50%。
  The lift is 50% in extension and 50% in compression.
• 适当的阀杆导引可以消除波纹管的挠曲。
  Proper stem guiding eliminates torsion of bellows.
• 波纹管材料为不锈钢321，因科镍合金或哈斯特镍合金。
  Bellows in SS 321, Inconel or Hastelloy.