Quick answer: building service valves are chosen for reliability and low maintenance rather than extreme pressure. Butterfly and gate valves handle isolation, globe and balancing valves handle regulation, and check valves protect pumps. Condenser and cooling water lines need the same corrosion thinking as any water system.
Typical valve matrix
| Service | Valve type | Why |
|---|---|---|
| Chilled and hot water isolation | Butterfly valve | Compact, low torque, cheap at larger diameters |
| Branch isolation | Gate valve or ball valve | Full bore with minimum pressure loss |
| Flow balancing | Balancing or globe valve | Repeatable regulation of branch flow |
| Pump protection | Check valve | Prevents reverse flow on pump stop |
| Condenser water | Butterfly valve, gate valve | Corrosion and coating choose the material |
What decides the final selection
- Water quality and whether corrosion or scaling is expected
- Whether the valve will be operated often or stay in one position
- Whether space and weight in the plant room are limited
- Whether the system will later be automated
待补内容位：待补：可提供的执行器与手轮配置、常用口径段的现货或短交期说明、批量项目交期。