Brief description of ISO15848 the Low Emission Test
The low emission test is generally according to the standard ISO15848, and ISO15848-1 is a type test, where the number of switching times is relatively large, at least 205 times; ISO15848-2 is a product test, and the switching times is generally about 5.
The ISO15848-1 type test has covering range. As long as the valve is of the same type, the stem seal type is the same, the prototype stem diameter is between half and two times, and the pressure rating is high level covering the low grade, such as: The prototype of 1500LB can be covered to 150LB all the time. As long as the sealing material and structure are the same, the endurance level is high level and low level (CO2 can cover CO1), and the leakage level is also the same (AH level can cover BH, CH level). After the type test of ISO15848-1, the prototype needs to be dismantled to see the damage degree of the relevant seals. If the sample of the general test needs to be used, the filler and other parts should be replaced and repaired.
And ISO15848-2 is the product test, which is suitable for factory acceptance. ISO15848-2 leakage grade is divided into A, B, C grades, of which A is the most advanced, generally used in bellows shut-off valves and other valves that require strict leakage level, the general requirements are grade B.
The ISO15848-1 type test has covering range. As long as the valve is of the same type, the stem seal type is the same, the prototype stem diameter is between half and two times, and the pressure rating is high level covering the low grade, such as: The prototype of 1500LB can be covered to 150LB all the time. As long as the sealing material and structure are the same, the endurance level is high level and low level (CO2 can cover CO1), and the leakage level is also the same (AH level can cover BH, CH level). After the type test of ISO15848-1, the prototype needs to be dismantled to see the damage degree of the relevant seals. If the sample of the general test needs to be used, the filler and other parts should be replaced and repaired.
And ISO15848-2 is the product test, which is suitable for factory acceptance. ISO15848-2 leakage grade is divided into A, B, C grades, of which A is the most advanced, generally used in bellows shut-off valves and other valves that require strict leakage level, the general requirements are grade B.
