摘要：PDS装置高频球阀年开关频率为20-220万次，而且存在温度交变剧烈，超细粉末，三相流介质，工况极其恶劣，再加上技术难度高，国内一直没有企业能够生产出质量稳定，性能可靠的PDS球阀，长期以来，高频开关球阀全部依赖进口，但是进口企业产品的年开关频率为36－100万次左右。
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