1·To make maintenance easy, in particular, can be easily cleaned on a regular basis, this is an internal restrictor can not be compared.
使维修保养方便，特别是可以很容易地定期清洗，这是内部节流器无法比拟的。
2·Underground natural gas process, the use of restrictor to prevent hydrate formation.
井下天然气开采过程中，利用节流器能预防水合物的生成。