Design and Manufacture: Cast steel gate valve to API 600(ISO 10434)or API 6D, API 600;

Inspection and Test: API 598, API 600 or API 6D
Carbon steel or stainless steel + flexible graphite combined gasket is usedforClassl50 gate valve; Stainless steel + flexible graphite
-wounded gasket is used for Class 300 gate valve; Stainless steel + flexible graphite wounded gasket is used for Class 600 gate valve and ring joint gasket is also optional for Class 600 gate valve; Ring Joint gasket is used for Class 900 gate valve; Pressurized seal design is used

Molded flexible graphite is used for packing material PTFE or combined packing material can be also used if being requested by the customer The internal surface of the stuffing box, of which area is contacted with the packing, is of excellent finish(Ra 3 2 u m)The stem surface, contacting with the packing, should be rolled and pressed after being precisely machined．so as to reach to the high finish and compactness(Ra 0 8 u m)and ensure the reliable tightness of the stem area