Stainless Steel Gate Valve for Steam Flange Type

stainless steel gate valve

application of norms

1 valve design and manufctyre according to GB/T 1234-89 requirements

2 the structure length, accordin to GB/T 12221-2005 of the provisions

3 the connection flange i accordance with the provisions of GB/T79

4 valve inspection and test according to GB/T 13927 requirement.

material:

1 body: WCB

2 wedge: WCB+ STL

3 stem: 2Cr13

4 stud: 35CrMoA

5 nut: 45

6 valve cover: WCB

7 stem packing: graphite

8 cross selling: 35

9 cotter pin: 30

10 gland: WCB

11 support: WCB

12 handwheel: KTH300-08

packing seal

molded flexible graphite is used for packing material. PTFE or combined packing material can be also used if being requested by the customer. The internal surface of the stuffing box, of which area is contacted with the packing, is of excellent finish. The stem surface, contacting with the packing, should be rolled and pressed after being precisely machined, so as to reach to the high finish and compactness and ensure the reliable tightness of the stem area.

stem design

the stem is of integral forged design. The minimum diameter of the stem shall per the standard requirement. The connection of the stem  and  disc is T type. The strenght of the connecting area is bigger than theta of the T threaded part of the stem. The strength test of that area cnforms to API 591.