hat
2, apre valv la ki ba-presyon pou DN50mm (aetv valv Yon sèl-fason):, yo ta dwe sèvi ak papiyon valv, tcheke valv ak manbràn vètikal leve valv chèk; Pou DN pi gran pase 200mm, mwens pase 1200mm nan ba tiyo chèk presyon, yo ta dwe ki pa retounen valv dwe chwazi sou mete nan esferik; pou dn pi gran pase 50mm, mwens pase 2000mm nan ba tcheke valv presyon, valv papiyon ak dyafram nan ta dwe itilize tiyo chèk la.
eng
2, following the low-pressure valve for DN50mm (aetv One-way valve) :, should use butterfly valve, check valve and diaphragm vertical lift check valve; For DN greater than 200mm, less than 1200mm of low pressure check valve, non-return valve should be selected on the wear spherical; for DN greater than 50mm, less than 2000mm of low pressure check valve, butterfly valve and the diaphragm should use check valves.