Seat leakage Questions
- Are there regulations for the seat leakage amounts of bronze/brass check valves?
-
When taking a 10K bronze/brass valve as an example, based on JIS B 2003, the seat leakage is measured by applying water pressure at 1.54 MPa (1.1 times) and then reducing the pressure to 0.51 MPa, which is 1/3 of the initial pressure.
Judgment of test result: 0.1 (mm3/sec) x Valve nominal diameter (mm)
For example, in the case of 50A, the test time is 15 seconds and the leakage amount is 0.1 x 50 = 5 (mm3/sec) and 5 x 0.06 = 0.3 (mL/min).
- A check valve has a seat leakage, is there a regulation for the leakage amount?
-
At the time of shipment, the leakage amount is less than the specified amount. However, after use, the valve body wears because of the opening and closing, and the leakage amount increases compared to that of the shipping inspection. Since it is difficult to seal with a check valve, please install a valve such as a gate valve for sealing.