Using constant pressure variables plunger pump, output pressure can keep constant and flow varies as per system's demand.
采用恒压变量柱塞泵，输出压力保持恒定，输出流量根据系统需要而变化。
On-demand pumps have a pressure switch that makes the pump build up pressure in the fresh water line.
按需水泵有一个压力开关，使泵在淡水输送线上产生压力。
On-demand pumps have a pressure switch that makes the pump build up pressure in the fresh water line.
按需水泵有一个压力开关，使泵在淡水输送线上产生压力。
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