6.7 小便冲洗阀水锤的测量 Measurement of water hammer for urinal flushing valves
6.7.1 水锤试验原理 Principle of water hammer test
The principle is to verify that the peak of pressure is limited, when a flushing valve closes.
6.7.2 试验装置 Test apparatus
6.7.2.1 General
A test rig as described in Figure 15 is used.
6.7.2.2 Procedure of choice of pipe sizing
Select the size of the supply pipe (2) according to Table 17 using the flow rate value (Q in l/s) according to
Table 16.
Table 17 — Dimension of the supply pipe
| DN ≤ to |
Q L/s ≤ to |
D int | Pipe |
|---|---|---|---|
| 15 | 0.15 | 13 | 13×15 |
| 15 | 0.3 | 20 | 20×22 |
| 20 | 0.5 | 20 | 20×22 |
6.7.3 程序 Procedure
The supply circuit shall deliver cold water at a static pressure of (0,5 +0-0,02) MPa ((5 +0-0,2) bar), with a pump with variable speed.
Procedure of filling of the air vessel in order to fill it at 50 % air:
a) depressurize the test rig;
b) fill the vessel with compressed air to 2,5 bar (0,25 MPa);
c) pressurize the rig with water at 5 bar (0,5 MPa) by regulating the pump speed;
- 1) connect the sample (5) at the test rig, directly after the pressure tee (4);
- 2) open the tap at minimum 5 times in order to completely de-aerate the circuit;
- 3) adjust the static pressure at 5 bar (0,5 MPa);
d) disable speed regulation of pump;
e) operate the flushing valve 5 s in order to stabilize the pressure, record the pressure and the flow rate;
f) allow the flushing valve to close, whilst continually recording the pressure.
Repeat the tests 3 times.
If a flow rate adjustment device has been set as indicated in 6.6.2.2, it will not be modified, unless if the flow rate exceeds 0,6 l/s . In this case, the flow rate shall be adjusted to 0,6 l/s.
6.7.4 要求 Requirements
The average of the peaks of pressure between the maximum pressure recorded during closure and the static
pressure 0,5 MPa (5 bar) shall not exceed 0,3 MPa (3 bar).