After PTFE Glyd ring was used in piston seals of hydraulic cylinder of electro-hydraulic hammer, the gas pressure rose because oil entered into gas chamber.
电液锤液气缸活塞密封采用由PTFE制造的格莱圈密封，在使用中液压油会窜入气腔，导致气体压力升高。
As the cartel's oil ministers gather in Vienna on September 10th to hammer out new production quotas, they are once again under intense pressure to release more oil, and fast.
九月十日欧佩克各成员国的石油部长们将在维也纳召开会议制定新的生产配额计划，他们将会再次面临尽快增加石油产量的巨大压力。
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