材料代号 meaning in Chinese

material mark

Double seals : material code for the secondary seal is directly followed by the product seal face codes
注：双端面机械密封的型号表示方法为：在产品型号规格的后面书写两组材料代号，用横线相连。
Use " w " to express seat facing ring material which process directly by valve body , when seat and discsealing material are different , use low hardness material symbol to express ( except diaphragm valve )
注：由阀体直接加工阀座密封面材料用" w "表示，当阀座和阀瓣（闸板）密封材料不同时，用低硬试验材料代号（除隔膜阀外）。