How to choose valves for water supply and drainage pipes? Recently, I was learning about valves and saw a widely circulated guide for selecting valves for water supply and drainage pipes on the Internet. Some of the content comes from the "Design Code for Water Supply and Drainage in Buildings", and some should be experience summaries. It is very useful for valve novices like me, so I share it wi
How to choose valves for water supply and drainage pipes?
Recently, I was learning about valves and saw a widely circulated guide for selecting valves for water supply and drainage pipes on the Internet. Some of the content comes from the "Design Code for Water Supply and Drainage in Buildings", and some should be experience summaries. It is very useful for valve novices like me, so I share it with you:
1. Valves used on water supply pipes are generally selected according to the following principles: 1. When the pipe diameter is not greater than 50mm, a stop valve should be used; when the pipe diameter is greater than 50mm, a gate valve or butterfly valve should be used; 2. When the flow rate and water pressure need to be adjusted, a regulating valve or a stop valve should be used; 3. For parts requiring small water flow resistance, gate valves should be used; 4. Gate valves and butterfly valves should be used on pipe sections where water needs to flow in both directions, and stop valves should not be used; 5. Butterfly valves and ball valves should be used in parts with small installation space; 6. Stop valves should be used on pipe sections that are frequently opened and closed; 7. Multi-function valves should be used on the outlet pipes of water pumps with larger diameters.
II. Valves should be installed at the following locations on the water supply pipeline:
1. The inlet pipe section of the residential area water supply pipeline from the municipal water supply pipeline;
2. The nodes of the outdoor ring pipe network of the residential area should be installed according to the separation requirements. When the ring pipe section is too long, it is advisable to install a segmented valve;
3. The starting point of the branch pipe or the starting point of the household pipe connected to the residential area water supply main pipe;
4. The household pipe, water meter and each branch riser (the bottom of the riser, the upper and lower ends of the vertical ring pipe network riser);
5. The branch pipe of the ring pipe network and the connecting pipe that runs through the branch pipe network;
6. The starting point of the distribution pipe connected to the indoor water supply pipeline to the residents, public toilets, etc., when there are 3 or more water distribution points on the distribution branch pipe;
7. The outlet pipe of the water pump, the suction pump of the self-priming water pump; 8. The inlet and outlet pipes and drain pipes of the water tank; 9. The water inlet and water supply pipes of equipment (such as heaters, cooling towers, etc.); 10. The water distribution pipes of sanitary appliances (such as urinals, washbasins, showers, etc.); 11. Certain accessories, such as automatic exhaust valves, pressure relief valves, water hammer eliminators, pressure gauges, sprinkler plugs, etc., before and after pressure reducing valves and backflow preventers, etc.; 12. The drain valve should be installed at the lowest point of the water supply network.
3. Check valves should generally be selected according to factors such as their installation location, water pressure before the valve, sealing performance requirements after closing, and the size of the water hammer caused when closing:
1. When the water pressure before the valve is small, swing, ball and shuttle check valves should be selected;
2. When the sealing performance after closing is strictly required, check valves with closing springs should be selected;
3. When it is required to weaken the closing water hammer, quick-closing silencer check valves or slow-closing check valves with damping devices should be selected;
4. The valve bend or valve core of the check valve should be able to close automatically under the action of gravity or spring force.
4. Check valves should be installed on the following sections of water supply pipelines:
1. On the inlet pipe;
2. On the water inlet pipe of a closed water heater or water-using equipment;
3. On the water outlet pipe of a water pump;
4. On the outlet pipe section of a water tank, water tower, or highland pool where the inlet and outlet pipes share a pipe.
Note: The pipe section equipped with a pipeline backflow preventer does not need to be equipped with a check valve.
V. Exhaust devices should be installed at the following parts of the water supply pipeline:
1. For water supply networks used intermittently, automatic exhaust valves should be installed at the end and the highest point of the network;
2. For pipe sections with obvious fluctuations and accumulated air in the water supply network, automatic exhaust valves or manual valves should be installed at the peak points of the sections for exhaust;
3. For air pressure water supply devices, when using automatic air-filling air pressure water tanks, automatic exhaust valves should be installed at the highest point of the water distribution network.
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