F91 Class 4500 Y Type Globe Valve manufactuer,factory and supplier, F91 Class 4500 Y Type Globe Valve is for high temperature steam system, which is pressure seal Bonnet or Welded Bonnet OS&Y for high pressure high temperature service.The chemical composition of F91 Globe valve includes carbon (0.20 ~ 0.25%), silicon (≤0.50%), manganese (0.50 ~ 1.00%), sulfur (≤0.030%), phosphorus (≤0.035%), chromium (11.00 ~ 13.00%), nickel (0.50 ~ 1.00%), vanadium (0.20 ~ 0.40%), molybdenum (0.75) ~ 1.25%) and tungsten (0.70 ~ 1.25%). These components give F91 excellent oxidation resistance and resistance to high-temperature steam corrosion, as well as good impact toughness and high and stable persistent plasticity and thermal strength properties.
F91 Class 4500 Y Type Globe Valve Application Standard:
API 602,ASME B16.34,BS 5352
Testing according to API 598
Marking to MSS SP25
Socket Welded Ends to ASME B16.11
Screwed Ends to ASME B1.20.1
Butt Welded Ends to ASME B16.25
Flanged Ends to ASME B16.5
F91 Class 4500 Y Type Globe Valve Construction Features：
1. Split forging blank, valve cap structure design of the process valve, online maintenance can remove the support, thereby reducing the grinding depth of the seat
2.55° inclined surface and vertical globe valve compared to the pressure drop ratio and flow resistance is small, strong anti-erosion ability
3. The non-rotating valve stem is hardened and polished to ensure reduced torque and prevent the packing from receiving torsional damage
4. Surfacing welding Stelli alloy valve disc and seat, the two different hardness difference, even in harsh applications can maintain a long service life
5. Fully guided disc to ensure that the accurate alignment of the seat and valve disc is not affected by the side thrust generated by high-speed fluid, avoid bruising the valve body, scratching or bending the valve stem, extend the valve seal and valve body life
6. The backseat bevel is located on the stem, not on the disc, in accordance with the relevant provisions of API-600 and API-602
7. Due to the intermediate material under the inside of the valve disc, the spool and the seat have non-rotating characteristics when they are sealed
8. Fully enclosed, wet slide valve stem drive system, equipped with two needle roller bearings to ensure that the operating torque is reduced
9. F91 Class 4500 Y Type Globe Valve has good resistance to thermal changes
10. suitable for sewage and discharge purposes
11. F91 Class 4500 Y Type Globe Valve valve disc type is blocked, needle or stop check type valve disc is optional
12. Hand wheel color is optional
