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.

Lip-seal(Elgiloy+PTFE)

The Lip-Seal 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 are 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, avoid packing freezing makes the torque larger, resulted in stem scracthed.

Self-centering on gland flange and gland packing, avoiding unbalance caused by uneven pressure.

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

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

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

There are drainage channel designed on packing postion in extended stem, which effectively stop condensate water flow into packing bore. Four open loop construction.

Trim top entry construction for online maintain.

Multiple sealing ring for customer's larger chosen range.

Disassembling deputy sealing design, it is complement function under cryogenic, lower leakage, better property.

Taper bevel pin fixed between disc and stem, which can avoid anti-turning under differential pressure, occur leakage.