Engineered for zero-leakage flow regulation in hazardous and high-purity environments, the EN Standard DIN CF8 Stainless Steel Bellow Seal Globe Valve delivers uncompromising safety and precise throttling.
Manufactured from high-quality ASTM A351 CF8 stainless steel (cast equivalent of 304), this valve offers outstanding resistance to general corrosion and oxidation. Designed strictly to DIN 3356 and EN standards, it features a revolutionary bellow seal construction that replaces traditional packing, creating a hermetic metal barrier between the process fluid and the atmosphere. Equipped with a secondary graphite packing backup and standard DIN flanged connections, this CF8 bellow seal globe valve ensures absolute zero external leakage, making it the ultimate solution for toxic, flammable, explosive, and high-purity media in chemical, pharmaceutical, and petrochemical piping systems.
Key Features & Benefits
· Zero-Leakage Bellow Seal Design: Utilizes a metal bellow component welded to the stem and bonnet, forming a hermetic physical barrier that eliminates external stem leakage, ensuring compliance with strict environmental and safety regulations.
· EN/DIN Standard Compliance: Designed and manufactured strictly to DIN 3356, DIN 3202, and EN specifications, ensuring perfect dimensional compatibility and reliable performance in European and global industrial infrastructure.
· CF8 Stainless Steel Construction: Crafted from premium ASTM A351 CF8 cast stainless steel, providing superior general corrosion resistance and durability in demanding chemical and high-purity environments.
· Dual Sealing Protection: Features a secondary flexible graphite packing backup behind the bellow seal, providing an emergency safety barrier to prevent leakage even in the event of extreme bellow failure.
· Precise Throttling & Shut-off: The plug-shaped disc moves linearly along the valve seat, with the port change directly proportional to the disc stroke, making it ideal for both precise flow regulation and reliable isolation of hazardous media.
· OS&Y Rising Stem Mechanism: Features an Outside Screw and Yoke design with a non-rotating rising stem, providing a clear visual indication of valve position and protecting stem threads from corrosive media exposure.
Technical Specifications
Parameter | Specification |
Valve Type | Bellow Seal Globe Valve |
Design Standard | DIN 3356, EN |
Body Material | Stainless Steel (ASTM A351 CF8) |
End Connection | Flanged per DIN EN 1092-1 |
Pressure Rating | PN16, PN25, PN40 |
Size Range | DN15 - DN300 |
Temperature Range | -20°C to +350°C |
Bellow Material | 304 / 316L Stainless Steel |
Trim Material | CF8, 304/316 SS, or Stellite Hard-Faced |
Operation | Manual Handwheel / Gear / Electric / Pneumatic |
Testing & Inspection | DIN 3230 / EN 12266 / ISO 15848 |
Applications
This high-performance EN/DIN CF8 bellow seal globe valve is widely deployed in:
· Chemical & Petrochemical: Handling toxic, flammable, and explosive media such as chlorine, ammonia, hydrogen, and phosgene where zero external leakage is mandatory.
· Pharmaceutical & Fine Chemicals: High-purity processing lines requiring absolute contamination control and zero product loss.
· Power Generation: High-temperature steam and thermal oil systems requiring reliable, maintenance-free sealing.
· Environmental Protection: Flue gas purification, wastewater treatment, and systems subject to strict TA-Luft or ISO 15848 emission regulations.
· HVAC & Refrigeration: Ammonia and refrigerant systems where leakage prevention is critical for safety and efficiency.
FAQ
Q: What is a bellow seal globe valve and why is it used?
A: A bellow seal globe valve uses a metal bellow welded to the stem and bonnet to create a hermetic seal, completely eliminating external stem leakage. It is used for toxic, flammable, expensive, or high-purity media where traditional packing seals pose safety, environmental, or contamination risks.
Q: What does CF8 mean in bellow seal globe valves?
A: CF8 is the ASTM A351 standard casting grade for 304 stainless steel. It offers excellent general corrosion resistance and is widely used in bellow seal valves for chemical, pharmaceutical, and general industrial applications handling non-chloride corrosive media.
Q: What standards apply to EN/DIN bellow seal globe valves?
A: These valves are designed to DIN 3356 (design), DIN 3202 (face-to-face), and DIN EN 1092-1 (flanges). Testing typically follows DIN 3230, EN 12266, or ISO 15848 for low-leakage certification, ensuring compliance with European safety and environmental regulations.
