The mathematical model of hydraulic regime of ring-shaped heat-supply network is established, and the pressurehead 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。
2
It is composed of open type engine body, hydraulic power cylinder, upper pressurehead, 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。
3
When the compaction head lowers and reaches maximum pressure, the hydraulic system locks.