How to choose and install valves for building water supply piping system?

There are complete sets of water supply and drainage systems in the buildings we live in, and valves are inseparable. We will introduce you to the water supply system valve configuration scheme inside the building!

Water supply mode of building water supply system

1. Direct water supply

Features: The system is simple, the investment is small, and the water pressure of the external network can be fully utilized, but once the external network stops water, the indoor water is immediately cut off.

Applicable places: water use places where the water volume and water pressure can meet the water demand in one day.

2. Water supply mode with storage tank, water tank and water pump

Features: The water pump can supply water to the water tank in time, can reduce the volume of the water tank, the water supply is reliable, the investment is large, and the installation and maintenance are more complicated.

Applicable places: when the water pressure of the outdoor water supply network is lower than or often cannot meet the water pressure required by the building’s internal water supply network, and the indoor water consumption is uneven.

3. Air pressure water supply method

Features: Reliable water supply, no high-level water tank, but low pump efficiency and high energy consumption.

Applicable places: The water pressure of the external network cannot meet the required water pressure, the water consumption is uneven, and the water tank is not suitable.

4. District water supply method

Features: It can make full use of the external network pressure, and the water supply is safe, but the investment is large and the maintenance is complicated.

Applicable places: The water supply pressure can only be used when the water supply requirements of the lower floors of the building can be met.

Principles for Selection of Valves in Building Water Supply System

1. When the pipe diameter is less than 50mm, a globe valve should be used, and when the pipe diameter is greater than 50mm, a gate valve or butterfly valve should be used;

2. When the flow and water pressure need to be adjusted, a regulating valve and a globe valve should be used;

3. A gate valve should be used for parts that require low water flow resistance (such as on the suction pipe of a water pump);

4. Gate valves and butterfly valves should be used on pipe sections where water flow needs to flow in both directions, and globe valves should not be used;

5. Butterfly valves and ball valves should be used in places where the installation space is small;

6. Globe valves should be used on pipe sections that are frequently opened and closed;

7. Multifunctional valve should be used on the outlet pipe of the pump with larger diameter.

Valve installation location of building water supply system

1. The water supply pipeline of the residential quarter is from the introduction pipe section of the municipal water supply pipeline;

2. The nodes of the outdoor loop pipe network of the residential area should be set up according to the separation requirements. When the loop pipe section is too long, segmented valves should be installed;

3. Start from the branch pipe connected to the main water supply pipe of the residential area or from the household pipe;

4. Household pipes, water meters and branch risers (the bottom of the riser, the upper and lower ends of the riser of the vertical ring pipe network)

5. The branch pipes of the ring-shaped pipe network and the connecting pipes through the branch-shaped pipe network;

6. The end of the water distribution pipe connecting the indoor water supply pipes to the households, public toilets, etc., and the water distribution points on the water distribution branch pipes are set when there are 3 or more;

7. The outlet pipe of the water pump, the suction pump of the self-filling water pump;

8. The inlet and outlet pipes and drain pipes of the water tank;

9. The water inlet and make-up pipes of equipment (such as heaters, cooling towers, etc.);

10. Water distribution pipes for sanitary appliances (such as urinals, washbasins, showers, etc.);

11. Certain accessories, such as automatic exhaust valves, pressure relief valves, water hammer eliminators, pressure gauges, sprinklers, etc. before and after pressure reducing valves and backflow preventers;

12. A drain valve should be installed at the lowest point of the water supply network.

Distribution of water supply valves inside the building

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