Main characteristics and USES
1、 compact structure, reasonable design, good rigidity, smooth channel, small flow resistance coefficient.
2、 the sealing surface of stainless steel and carbide, long service life.
3、using the flexible graphite packing, reliable seal, flexible operation of the light.
4、 drive way points in dynamic, electric, qigong, gear transmission, structure: elastic wedge single ram, rigid wedge single ram and double disc type.
5、 is widely used in petrochemical, oil, steam pipeline, such as coal-fired power plants connected or truncated the medium inside the pipe opening and closing device.
As the material different, the general medium and the temperature are also different,for example when the material is carbon steel ,the general medium is allowed water、 steam 、oil and the temperature is 425centigrade degree or less.
Test pressure
|
Nominal pressure (MPa) |
Test pressure (MPa) |
|||
|
shell |
Seal (liquid) |
Seal (gas) |
On the seal |
|
|
1.6 |
2.4 |
1.5 |
0.6 |
1.8 |
|
2.5 |
3.8 |
2.8 |
2.8 |
|
|
4 |
6 |
4.4 |
4.4 |
|
|
6.4 |
9.6 |
7 |
7 |
|
|
10 |
15 |
11 |
11 |
|
|
16 |
24 |
18 |
18 |
The major parts material:
|
Body and bonnet |
Disc, seat |
The valve stem |
Stem nut |
packing |
The handwheel |
|
Carbon steel |
High quality carbon steel + hard alloy or stainless steel |
Chromium stainless steel |
Aluminum bronze |
Graphite asbestos packing |
Malleable iron |
|
Titanium nickel chrome steel |
Stainless steel, stainless steel + carbide |
Chromium nickel titanium stainless steel |
Immersed teflon |
||
|
Titanium nickel chrome molybdenum steel |
Stainless steel, stainless steel + carbide |
Chromium nickel titanium stainless steel |
Asbestos packing |
||
|
Chrome molybdenum steel |
Alloy steel + carbide |
Aluminum nickel molybdenum steel |
Flexible graphite, four fluorine filling |
||
|
Series resistance (sulfur) |
Scope of application:
|
Shell material |
General medium |
Suitable temperature (cencigrade degree) |
|
Carbon steel (C type) |
Water, steam, oil |
425 or less |
|
Titanium nickel chrome steel (P) |
Nitrate class |
200 or less |
|
Titanium nickel chrome molybdenum steel (R) |
Acetic acid class |
200 or less |
|
Chrome molybdenum steel (type I) |
Water, steam, oil |
550 or less |