Heat pipe network also known as heat pipe, from the boiler room, direct-fired machine room, heating center, from the heat source to the building thermal entrance of the heating pipe. Multiple heating pipes form a pipe network.
Shut-off valve should be installed at the starting point of main line, branch line and branch line of Heating Network pipeline.
Subsection valve should be installed in the trunk line of hot water heating network. The interval of sectional valve should be: 2000 ~ 3000m for main line, 1000 ~ 1500m for main line, no sectional valve can be installed in steam heating network. The two-way sealing valve should be used in the sectional valve of the connecting trunk line and ring pipe network of the heat source in the multi-heat source heating system.
Bypass Valves shall be installed on gate valves in pipelines with working pressure greater than or equal to 1.6 MPA and nominal diameter greater than or equal to 500 mm. The diameter of by-pass Valve can be selected by one-tenth of the valve diameter.
When the supplying water capacity of heating system is limited, it is necessary to control the filling water flow or the steam flow when the steam pipe starts up.
When dynamic hydraulic analysis needs to prolong the closing time of subsection valve in the main line to reduce the pressure transient value, the main valve should be used to solve the problem. By-pass valve diameter may take the main valve diameter one-fourth. The main valve and by-pass Valve shall be interlocked. The by-pass Valve shall be closed only when the main valve is open. The by-pass Valve shall be closed only when the main valve is closed.
The nominal diameter is greater than or equal to 500 mm valve, should use electric drive device. For Valves operated remotely by the Monitoring System, the by-pass Valve shall also be electrically driven.
There are many kinds of valves used in the heat pipe network. Such as gate valve, globe valve, ball valve, butterfly valve, check valve, safety valve, control valve, balance valve, self-balancing valve and so on. Gate valve in the pipeline it plays the role of shutdown; globe Valve in the pipeline it plays the role of shutdown, also can roughly adjust the flow;ball valve, butterfly valve in the pipeline shut off; check valve is generally installed in the pump outlet to prevent water hammer damage to the pump. Regulating valve, regulating the medium flow distribution between pipelines to achieve thermal balance; safety valve is widely used in pressure vessels.
Post time: Nov-25-2021