Precision machining procedure, controling the gap of stem and extened bonnet below 1mm, guarranting the smooth turning of stem, and also reduced the possibility of freezing and lossing caused by cryogenic service.

The Lip-Seal is not only have the Flexible compensation function as Spring, but also excellent sealing as PTFE. Excellent Sealing under Cryogenic Temp., fire safe design as the secondary sealing of graphite.

All the fastners is full threaded construction for Cryogenic Temp., it is effectively avoid fastners long deformation and sealing failed.

Stem: double sealing design, the primary sealing is lip seal, secondary sealing is packing, which can reduce the amount of packing usage.

Extended bonnet design: the gap between stem and extention parts is strictly controlled, which reduced the cryogenic service crossing up, avoiding packing freezing and torque larger to make stem scracthed.

Self centering design on gland flange and gland packing to avoid stress imbalance.

By FEA design, best thickness of extended bonnet is calculated, it would guarrantee the best cooling effect.

Extended bonnet with ARC design, enlarged the cooling area, strengthen the cooling results.

The design of drip plate, it firstly enlarged the effective cooling area, avoid the freezing problem of stem and packing dynamic sealing area resulted larger torque; secondly, it effectively stop the condensate water drop into body resulted in body double sealing on connection of body bonnet.

It's primary sealing is Lip-Seal, it's secondary sealing is gasket.

DIB-2 seat construction, which can guarrantee the body pressure would be released to another without any danger.

Lip-seal sealing construction, the lip-seal is not only have the flex. compensation as spring, but also have excellent flexible. sealing property as PTFE, this combined using can promise the effective sealing under cryogenic condition.

Imported PCTFE used as seat sealing, it has good flexible function under cryogenic condition, promising it's sealing.

Extended stem design, make sure the better self-centering of bushing. stem and bonnet, opening smoothly.

The ball hardened to make sure no scrathing under cryogenic temperture.

Trim top entry construction for online maintain.