1 Pressure - temperature rating

Valve rated pressure - temperature rating according to GB / T 12224 requirements. For some of the elastic seal pair structure, or internal components, materials, special handling by the valve, the pressure - temperature rating of less than the body of the pressure - temperature rating, whichever is lesser value should be, and shall be the nameplate marked.

2 Structure of the structure of a long length of valve according to GB / T 12221 requirements, or by ordering the contract requirements.

3 connectors

3.1 with the pipe flange connection of the terminal according to GB / T 9113.1 ~ 9113.4 of the regulations, or orders contractual requirements.

3.2 welded connector size by GB / T 12224 requirement, or order contract requirements.

4 body

4.1 The body should be cast or forged shape.

4.2 The structure of the body welding, valve and pipe connector flange, valve body and valve cover flange connected to the flange should be used forged material, the welding of the flange and the body shall comply with the provisions of GB 150, after welding material properties should be carried out by the appropriate heat treatment.

4.3 In addition to 4.4.4 of the welding connectors welding end valve, the valve shell wall thickness tm minimum requirements in Table 1.

Table 1, the minimum wall thickness of the shell valves in millimeters