Compact Steel Gate Valves In API 602

Compact Steel Gate Valves In API 602:

API STANDARD 602

-Compact Steel Gate Valves: Flanged, Threaded, Welding, and Extended-Body Ends

This standard covers flanged-end, threaded-end, socket-welding-end, and butt-welding-end compact steel gate valves, including extended-body, and bellows seal types, corresponding to nominal pipe sizes in ASME B36.10M or ASME B36.19M as defined herein.(Compact steel gate valves are normally called forged steel gate valves )

1 Scope  
1.1 This standard covers flanged-end, threaded-end, socket-welding-end, and butt-welding-end compact steel gate valves, including extended-body type, corresponding to nominal pipe sizes in ASME B36.10M or ASME B36.19M as follows: a) flanged-end and butt-welding-end in sizes NPS 4 and smaller, b) threaded-end and socket-welding-end in sizes NPS 2 1 / 2  and smaller, and c) bellows seal bonnet types in sizes NPS 2 and smaller. The following valves are covered by this standard: 

a. Class 800 valve with threaded, socket-welding, or butt-welding ends; an inside screw with rising stem (ISRS) and threaded packing nut or an outside screw and yoke (OS&Y)with rising stem and bolted packing-gland flange; and bolted, union, welded, or threaded-and-seal-welded bonnet. 

b. Class 1500 valve with threaded, socket welding, butt-welding, or flanged ends; an OS&Y with rising stem and bolted packing-gland flange; and a bolted, welded, or threaded-and-seal-welded bonnet. 

c. Class 150, 300, and 600 flanged-end or butt-welding-end OS&Y valves (excluding cast steel gate valve) with rising stem; bolted packing-gland flange; and a bolted, welded, or threaded-and-seal-welded bonnet.

d. Class 800 and Class 1500 extended-body valves conforming to items a and b above, except with male by female ends in sizes NPS  1 ⁄ 2 ,  3 ⁄ 4 , 1, 1 1 ⁄ 2 , and 2 and in size NPS  3 ⁄ 4  male by NPS  1 ⁄ 2  female.

e. Threaded-end male extensions for Class 1500 or for size NPS 1 ⁄ 2  in Class 800 are not covered by this standard. 

f. Class 150, 300, 600, 800, and 1500 valves with bellows stem seal with the additional requirements covered in Appendix A.  

1.2 Figures 1 and 2 present illustrations of a typical ISRS gate valve and an OS&Y gate valve. Figure 3 shows a typical extended-body valve. The illustrations should not be construed as sponsoring such designs in whole or in part or as discriminating against other designs offered that conform to the requirements of this standard.  

1.3 The illustrations in Tables 4 and 5 show some of the typical arrangements for the male end of extended-body valves (made by China valve manufacturer). These illustrations should not be considered preferable to other arrangements that conform to the requirements of this standard.