4014 Led Chip,4014 White Color Led Chip,White Color Led Chip,4014 Smd Led Chip Shenzhen Huangtai Photoelectric Co.,Ltd. , https://www.ht-led.com1, double seal design (bellows + packing) If the bellows failure, stem packing will avoid leakage, and in line with international standards for sealing 2, no fluid loss, reduce energy loss, improve plant safety 3, long service life, Reduce the number of repairs and reduce operating costs 4, rugged bellows seal design to ensure zero stem leakage, providing maintenance-free conditions 5, the gas medium valve seat PTFE soft sealing material to improve the sealing of the valve 6, high temperature ≤425 ℃ seat with tapered hard seal. Achieved airtight performance zero leakage