Disc is guided by the mating surface of the seat, hardfaced with 13 CR, Stellite 6, SS 316 or Monel, ground and lapped with seat.

• 阀瓣通过啮合阀座表面进行导引，阀座表面经过13CR、钨铬钴合金、316不锈钢或蒙乃尔硬化、研磨抛光。