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A) The valves used in the water supply pipeline are generally selected according to the following principles:
1. When the pipe diameter is not greater than 50mm, a shut-off valve should be used. When the pipe diameter is greater than 50mm, a gate valve and a butterfly valve are used.
2. When adjusting the flow and water pressure, it is advisable to use a regulating valve and a shut-off valve
3. For parts requiring small water flow resistance (such as on the suction pipe of the pump), the gate valve should be used
4. Gate valves and butterfly valves should be used on the pipe sections where water flow needs to flow in both directions, and globe valves should not be used.
5. Butterfly valve and ball valve should be used in the small installation space
6. On the pipeline section that is frequently opened and closed, the globe valve should be used
7. The multi-function valve should be used on the outlet pipe of the larger-diameter pump
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(2) The following parts on the water supply pipeline shall be provided with valves:
1. The water supply pipeline in the residential area is from the introduction pipe section of the municipal water supply pipeline
2. The nodes of the outdoor ring pipe network in the residential area should be set according to the separation requirements. When the looped pipe section is too long, it is advisable to install a segmented valve
3. The beginning of the branch pipe or the household pipe connected from the main water supply pipe in the residential area
4. Inlet pipe, water meter and branch risers (bottom of riser, upper and lower ends of vertical circular pipe network riser)
5. The branch pipe of the ring pipe network and the connecting pipe through the branch pipe network
6. The beginning of the water distribution pipe from the indoor water supply pipe to the residents and public toilets, and the water distribution point on the water distribution branch pipe is set when there are 3 or more
7. Outlet pipe of water pump, suction pump of self-priming water pump
8. Inlet and outlet pipes and drain pipes of the water tank
9. Inlet and make-up water pipes of equipment (such as heaters, cooling towers, etc.)
10. Water distribution pipes for sanitary appliances (such as large and small urinals, washbasins, showers, etc.)
11. Some accessories, such as the front of automatic exhaust valve, pressure relief valve, water hammer eliminator, pressure gauge, sprinkler, etc., the front and back of pressure relief valve and backflow preventer, etc.
12. The lowest part of the water supply network should be equipped with a drain valve
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3) The check valve should generally be selected according to factors such as its installation location, the water pressure in front of the valve, the sealing performance requirements after closing, and the size of the water hammer caused during closing.
1. When the water pressure before the valve is small, swing check, ball check and shuttle check valves should be used.
2. When the sealing performance requirements after closing are strict, the check valve with closing spring should be selected
3. When it is required to weaken and close the water hammer, the quick-closing muffler check valve or the slow-closing check valve with damping device should be used.
4. The valve break or spool of the check valve should be able to close by itself under the action of gravity or spring force.
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(4) Check valves should be installed on the following sections of the water supply pipeline:
On the inlet pipe; on the inlet pipe of the closed water heater or water equipment; on the outlet pipe of the water pump; on the outlet pipe section of the water tank, water tower, and highland pool where the inlet and outlet pipes are combined with one pipeline.
Note: It is not necessary to install a check valve for the pipe section equipped with a pipeline backflow preventer.
(5) The following parts of the water supply pipeline shall be provided with exhaust devices:
1. For the intermittently used water supply pipe network, automatic exhaust valves should be set at the end and the highest point of the pipe network
2. There is a pipeline section with obvious undulation and accumulation of air in the water supply network, and an automatic exhaust valve or a manual valve has been set to exhaust at the peak point of the section
3. Air pressure water supply device, when using automatic air supply type air pressure water tank, the highest point of its water distribution network should be equipped with an automatic exhaust valve
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