Full set of pipe orifice, valves, flanges and counter flanges, fasteners and all other attachments, all water release valves, gas release valves and safety valves.
全套管道孔板、阀门、法兰及反法兰、紧固件及其它所有附件，所有放水、放气阀门及安全阀。
2
The more water forced through a fixed orifice the more pressure.
记住压力是由水通过孔径产生的。
3
According to hydraulic principle, the change of efficient water head, discharge coefficient and discharge of orifice along porous pipes have been discussed and checked by experiments in this paper.