P:	40kg/cm2
T:	-40oC~200oC
V:	20m/s
D:	25mm~120mm
Materials:
Head:	Carbon, SSiC, SiC, TC.
Seat:	SSiC, SiC, TC.
O-Ring	EPDM, Viton, FEP,AFLAS
:Spring:	316SS, Hastlloy C.