The mathematical model of hydraulic regime of ring-shaped heat-supply network is established, and the pressure head check formula for quota heating is given.
建立了环状管网水力工况的数学模型，给出限额供热的压头校核公式。
It is composed of open type engine body, hydraulic power cylinder, upper pressure head, and lower type box. The type box can be collocated with manual four-positions renewal.
有开式机身、液压动力缸、上压头、下字盒等组成。下字盒可配手动四位根据用户要求更换。
When the compaction head lowers and reaches maximum pressure, the hydraulic system locks.
当压缩头下降并达到最大压力时，液压系统会锁定。
When the compaction head lowers and reaches maximum pressure, the hydraulic system locks.
当压缩头下降并达到最大压力时，液压系统会锁定。
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