Valve Type Designation And Marking In China

The role of valve identification

Valve identification in the lack of valve drawings, lost the nameplate and valve parts are not complete, the correct use of valves, welding valve parts, repair and replacement of valve parts is important. Now the valve marking, material identification and valve identification are described below:

The use of "basic knowledge of the valve" learned knowledge, according to the nameplate and logo on the valve and the valve on the paint color. You can directly identify the category of the valve, structural form, material, nominal diameter, nominal pressure (or working pressure), adaptable media, temperature and closing direction.

1.The nameplate is fixed on the valve body or handwheel. The data on the nameplate is more complete and reflects the basic characteristics of the valve. According to the manufacturer on the nameplate, to the manufacturer for the valve wearing parts drawings and information; according to the factory date of reference to the repair; according to the nameplate provides the conditions of use, to determine the replacement of gaskets, valve plate materials and forms as well as to determine the replacement of other valve parts of the material.

2.Marking is used casting, lettering and other methods in the valve body marking the valve nominal pressure, working pressure, nominal caliber and medium flow direction.

3.Valve there is a kind of marking open-close instructions, it has opened the ruler scale or indicate the opening and closing of the arrow. Throttle valves, dark stem gate valves are labeled with switching instructions on the upper end of the handwheel is labeled with an arrow pointing in the direction of the open-close.