The marks on the valve body are used for quality traceability. In principle, these marks can be explained as long as they can be traced back to the manufacturer. Therefore, the right to interpret the trademark lies with the manufacturer.

However, according to international and China standards, several parameters should be made on the valve body whenever possible.

Nominal diameter;

Pressure grade;

Valve body material;

The name or trademark of the manufacturer;

Serial number or similar mark.

There is always a convention to look for the manufacturer's logo. So we can roughly judge the meaning of this mark:

The pattern on it should be a trademark;

6×4 is uncertain, but it should be path-related data (for example, 6-inch pipe diameter and 4-inch spool diameter);

300 is the pressure level, which is about 300LB (30 bar and 300 MPa are possible, so it is not difficult to judge which is more reasonable from the thickness of the valve housing, and your photo can't see the whole);

A 105 there is a forged steel brand commonly used in the United States as a105;

LC8586 should be the serial number.

In fact, these marks should be in the nameplate or technical manual. You can get the specific meaning by comparing it.