Abstract： ASME B16.10:2009 pdf download.Face-to-Faceand End-to-End Dimensions of Valves. 2.1.3 Reduced Port Valves (a) Reduced port, gate, and ball valves conforming to API 6D are designated for size by two numbers, the first being the NPS on the val...

ASME B16.10:2009 pdf download.Face-to-Faceand End-to-End Dimensions of Valves.

2.1.3 Reduced Port Valves

(a) Reduced port, gate, and ball valves conforming to API 6D are designated for size by two numbers, the first being the NPS on the valve ends, the second being the NI’S of the port (seats, moving parts, etc.); e.g., NI’S 6 x 4 designates a valve of end size

NI’S 6 with a port to match NI’S 4. These valves shall have face-to-lace or end-to-end dimensions corresponding to valves having the same size end connections; i.e., a NI’S 6 X 4 valve shall have the face-to-face or end-to-end dimensions of a NI’S 6 ralve

(fr) Reduced port, pressure seal bonnet, gate, globe, and check valves are designated for size by three numbers, the first and last being the NI’S of the valve ends, the second being the NI’S of the port; e.g., NI’S 6 X 4 X 6 designates a valve having ends

matching NPS 6 with a port tç match NI’S 4. likewise, NI’S 6 X 4 X 4 would designate a valve having one end matching NI’S 6, the other matching Ni’S 4, and the port matching NI’S 4. These valves shall have face-to-face or end-to-end dimensions corresponding to valves having the same port size; i.e., either a NI’S 6 x 4 x 6 or a NI’S 6 x 4 x 4 valve shall have the face-to-face or

end-to-end dimensions of a NI’S 4 valve.

2.2 Pressure Rating Designations

Class, followed by a dimensionless number, is the standardized designation for pressure temperature- ratings used for valves. The

numerical designations in use are as follows:

(a) for cast iron: 25, 125, 250

(b) for ductile iron: 150, 3(X)

(c) for steel:2 150, 300, 600, 900, 1500, 2500

2.3 Flanged Valve Dimensions

2.3.1 Face-to-Face. The face-to-face dimension for flanged valves is the distance between the extreme ends which are the gasket

contact surfaces (see Fig. 1). Face- to-face applies to flanged valves having the following nominal flange facing identifiers.

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