FESTO比例调节阀采取金属密封的阀门一般比弹性密封的阀门寿命长，但很难做到完整密封。金属密封能适应较高的 工作温度，弹性密封则具有受温度限制的缺 点。 假如请求电动球阀作为流量把持使用，重要的是准确选择阀门的尺寸和类型。电动球阀的构造原理尤其合适制造大口径阀门。电动球阀不仅在石油、煤气、化工、水处置等一般产业上得到普遍运用，而且还利用于热电站的冷却水体系。
自力式压力控制阀）无需外加能源，利用被调介质自身能量为动力源，引入执行机构控制阀芯位置，改弯两端的压差和流量，使阀前（或阀后
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