It is not necessary to open this valve to the full open position to provide full flow to the process.
必须把阀门开到完全开启的位置，以提供完全的流通。
2
Before closing the switch to allow electric current to flow to the heater, make certain that the heater is full of water and that the cold water inlet valve is open.
在打开电源开关之前，要确保热水器处于满水状态，冷水进水阀门处于开启状态。
3
Nominal diameter and flow valves, basically the same breath for full-bore type, Circulation than nominal diameter valve is given. it small called non-reducing type.