Sec. 14-9.8. Stamping of valves

Each safety valve or safety relief valve shall be plainly marked by the manufacturer in such a way that the markings will not be obliterated in service. The markings may be stamped on the casing, or stamped or cast on a plate or plates securely fastened to the casing, and shall contain the following markings:

(a) The name or identifying trademark of the manufacturer.

(b) Manufacturer's design or type number.

(c) Size _ in. Seat diameter _ in.

(The pipe size of the valve inlet.)

(d) Pressure

 

lb.

(The steam pressure at which it is to blow.)

(e) Year built, or alternatively, a coding may be marked on the valve such that the valve manufacturer can identify the year built.

(f) Capacity

 

lb. per hr.

(In accordance with sections 14-9.9 and 14-9.12 of this Subpart.)

(g) Capacity lift

 

in.

(Capacity lift-distance the valve disk rises under the action of the steam when the valve is blowing under a pressure of three percent above the set pressure.)

(h) ASME symbol.