Spirax Sarco Type Steam Bellow Seal Globe Valve (GAWJ41H)
Product Description
Brief Introduction.
Corrugated pipe globe valve belongs to the forced sealing type valve. When the valve is closed, pressure must be applied to the valve disc to force the sealing surface not to leak. When the medium enters the valve from below the valve disc, the resistance that needs to be overcome by the operating force is the friction force between the valve stem and packing and the thrust generated by the pressure of the medium. The force to close the valve is greater than the force to open the valve, so the diameter of the valve stem should be larger, otherwise the failure of the valve stem top bending will occur. In recent years, since the emergence of self sealing valves, the medium flow direction of the shut-off valve has shifted from above the valve disc to the valve chamber. At this time, under the action of medium pressure, the force to close the valve is small, while the force to open the valve is large, and the diameter of the valve stem can be correspondingly reduced. At the same time, under the action of the medium, this type of valve is also relatively tight. The "three modernizations" of valves in China once stipulated that the flow direction of shut-off valves should be from top to bottom.
Product Features
Main Structural Features.
1.This product has logical structure, reliable seal, excellent performance and nice design.
2.Sealing face is overlayed by STL, which is friction-resistant, corrosion resistant to ensure a long time use life.
3.Stem heat-treatment and surface nit riding-treatment to ensure function of corrosion resistance and friction resistance.
4.It has double seal, thus the capability is more reliable.
5.The stem may show the position of lift, thus it is more clearer.
6.The parts material, flange and butt welding dimension may selected according to current operating condition or users
' requirement to meeting the requirement of various engineering.
Specification
Technical Specification.
Construction: BB-BG, Non Rising Stem.
Operation: Manual, Pneumatic
Design Standard: DIN3356
Face to Face Dimension: DIN3202
Flange Ends: DIN2543-2545
Test & Inspection: DIN3230
Product Details
MAIN PARTS MATERIALS
| NO. |
PART NAME |
MATERIAL |
| 1 |
Body |
GS-C25, CF8, CF3 |
| 2 |
Disc |
2Cr13, F304, F316 |
| 3 |
Hinge Pin |
F304, F316 |
| 4 |
Bellows combination |
F304, F316 |
| 5 |
Bonnet |
GS-C25, CF8, CF3 |
| 6 |
Packing |
Flexible graphite, PTFE |
| 7 |
Gland |
25#, F304, F316 |
| 8 |
Hexagon Nut |
25#, F304, F316 |
| 9 |
Stem Nut |
ZQA19-4 |
| 10 |
Hand wheel |
Carbon Steel |
| 11 |
Cap |
Brass |
| 12 |
Hexagon Nut |
ASTM A193 2H, A193-8, A193-8M |
| 13 |
Bolt |
ASTM A193 B7, A193-B8, A193-B8M |
| 14 |
Combination Gasket |
Flexible graphite+S.S. PTFE |
| 15 |
Stem |
2Cr13, F304, F316 |
Product Parameters
Products Performance Specification
| PN (MPa) |
Shell Test (MPa) |
Sealing Test (MPa) |
Suitable Temp (ºC) |
Suitable Medium |
| 1.6 |
2.4 |
1.76 |
-20ºC-350ºC |
Water, Steam, Oil, Etc. |
View of the factory
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