The plug-type globe valve is a forced-sealing valve, requiring pressure application to the disc during closure to ensure leak-proof sealing. When the medium enters from below the disc, the operating force must overcome the combined resistance of stem-packing friction and medium pressure thrust. Consequently, the closing force exceeds the opening force, necessitating a larger stem diameter to prevent bending failure.
In recent years, with the advent of self-sealing valves, the medium flow direction has been reversed-entering the valve cavity from above the disc. This design reduces the closing force (as medium pressure assists sealing) while increasing the opening force, allowing for a smaller stem diameter. Additionally, this configuration enhances sealing tightness under medium pressure.
Specification
Size Range: DN25~300mm NPS1"~12"
Pressure: PN1.6~16.0MPa Class150~Class2500
Body Material: Ductile Cast Iron, A217 WC6/WC9, A351 CF8/CF8M/CF3/CF3M, A336 F92/F91, etc.
Operation: Hand Wheel, Worm Gear, Electric, Pneumatic
Features:
1. Relying on the principle of the globe valve, the valve disc changed as a cylinder.
2. The inclined cone surface of the plunger end and the cone surface of the valve seat complete the opening and closing.
3. By adjusting the pre-tightening force of the middle flange bolts, the lateral force generated by the compression of the sealing ring is sealed with the outer circle of the plunger on the middle hole surface of the valve body, thus ensuring the sealing performance of the valve.
4. The sealing is reliable and durable, thus extending the service life of the valve.
5. Combining the leak-free advantages of the plunger valve and the fast opening and closing characteristics of the stop valve, its superiority is far better than that of ordinary stop valves.
6. Range of working temperature: 0℃~600℃.
7. Connecting type: Flange, BW.
8. Application: Petrochemical, metallurgy, chemical industry, power station, pharmaceutical, etc.
