The tubing diameter of a toilet self closing flushometer

Such a professional question, no!

However, the general toilet inlet pipe is DN25 (about 1 meter), and the main pipeline uses a pipe larger than DN32, which can be used as an empirical reference.

The Gebriel Stool Flushometer is designed with DN25 water inlet diameter and can be used in any occasion directly.

Time-delay self-closing flushometer connection diameter.

Background: From the "Code for Design of Building Water Supply and Drainage", it is known that the design second flow of living water supply in dormitories (class I, class), hotels, guesthouses, serviced apartments, hospitals, nursing homes, kindergartens, nursing homes, office buildings, shopping malls, libraries, bookstores, passenger stations, terminals, convention and exhibition centers, primary and secondary school teaching buildings, public toilets and other buildings should be calculated as follows:

q = where q - calculate the design flow rate per second (l s) of the pipe section

n - calculate the total amount of water equivalent of sanitary appliances in the pipe section;

A factor based on the purpose of the building.

The following points should be paid attention to when using the above formula:

a.If the calculated value is less than the maximum rated flow rate of sanitary appliances on the pipe section, the maximum rated flow rate of sanitary appliances should be used as the design second flow.

b.If the calculated value is greater than the flow value obtained by adding the rated flow rate of sanitary appliances on the pipe section, it should be used according to the flow value obtained by adding the rated flow rate of sanitary appliances.

c.The water supply pipe section with toilet delay self-closing flushometer, the water supply equivalent of toilet delay self-closing flushometer are all counted, and after calculating the flow rate of Q plus l s, the water supply second flow rate of this pipe section is designed.

When the toilet adopts a delayed self-closing flushometer, check the table in the "Design Code for Building Water Supply and Drainage": the rated flow rate of the delayed self-closing flushometer is, the water supply equivalent is 6L s, and the rated flow rate of the wash basin is the equivalent of .

Examples: Public restroom, 2 wash basins, 1 toilet (with delayed self-closing flushometer).

Take =, then q = + l s

To select the pipe diameter, the minimum pipe of DN40 should be selected to meet the requirements.

Problem: A toilet with a delayed self-closing flushometer requires such a large pipe diameter.

Problem extension: From the table in the "Building Water Supply and Drainage Design Code", it can be found that the rated flow rate of the delayed self-closing flushometer is, according to this calculation, it is almost necessary to choose the DN32 pipe, and **, the minimum pipe diameter of the connection is DN25, according to this, the connection pipe diameter is not a bit small.

In practice, the connection diameter of the public restrooms with time-delay self-closing flushometers is generally only DN25 or DN32.

OK. I generally mark 25, the diameter of the main pipe should be large, and the diameter of the self-closing valve connecting each squatting toilet is 25.

You look at the table on the spec.

The transverse tube is 1 inch--- that is, 32 tubes.

The riser is 6 minutes--- that is, 25 pipes.

The smallest diameter of the toilet is the hole, if the hole distance is 300 holes, 400 holes, and 220 holes are the national standard.

How wide and how long the toilet is.

The size of the squatting toilet inlet from the ground should be - the height of the squatting toilet is +50cm (the height of the water tank is 80cm - buried 8cm - the water tank is 2cm), if you can, it is best to add an inner tooth elbow to the water outlet about 10cm on the side of the water inlet of the squat basin water tank, especially if there is no bathroom with another urinal, so that the hygiene of the squatting basin table is much easier to clean, after all, the water tank can only be managed in the squatting pit!

Problem 1: Because the flow rate of the toilet flushing is very large, the dust dismantling is not combined with other water supply appliances.

Problem 2: According to the design code for building water supply and drainage, the working pressure of the flushometer is calculated according to the rated flow. A stool filial piety macro does not need such a large diameter.

The diameter of the connecting pipe of the toilet of the delay self-closing flushometer is DN25

PPR tubing is used.

The nominal diameter is DN25, the nominal outer diameter is 32, the wall thickness is 3, the inner diameter is calculated to be 261, and the hydraulic calculation is QG=

q (cumulative) = l s

q (design second flow) = min (qg, q (cumulative)) = l s2, flow rate v = (4000 * q (design second flow) m s3, the flow rate does not meet the "building water supply and drainage design code".

The flow rate requirement in P35 also does not meet the flow rate requirement of P23 of the "Water Supply and Drainage Technical Measures".