如果第二重合成橡胶阀座在火灾期间被损坏，则金属-金属阀座还可以保证气密性。
The metal-to-metal seat ensures tightness if the secondary elastomer seat is damaged during the fire.
为了翻转阀座阀瓣，则要拧松阀瓣螺丝，从阀瓣固定器总成拆解阀瓣垫圈和阀瓣橡胶。
To reverse the seat disc, unscrew the disc screw and disassemble the disc washer and disc rubber from the disc holder assembly.
在三元乙丙橡胶(EPDM)阀座上不要使用凡士林或其它石油基产品。
Do not use Vaseline or other petroleum - based products on EPDM seats.
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