Adjustable polished rod packing box

Our modified self-sealing polished rod packing box can adjust the packing's tightness with respect to the change of the flow tubing pressure, thus, improving the packing's lifetime and reducing the operating times of packings.
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Company:
Address:
Xi’an Dongxin Petroleum Equipment Plant Co., Ltd
2408, A building, Kaichuang International Building, NO. 31 Gaoxin Road, Xi'an, China[710075]
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