Bellows Seal Valves configuration.

In common valves, the packing seal of the stem ages fast and it is easy to leak, but this design totally eliminates these short comings. Apart from increasing the efficiency of materials and the safety of production equipment, it not only reduces maintenance the costs and frequent maintenance of products but also provides a clean and safe working environment. Double seal design(bellows and packing ),if the bellows invalidates, the stem packing will prevent outside leaking. There are no fluid loss,but it reduces the energy loss and improves the equipment safety. Longer service life, less maintenance and lower operating costs. Firm and durable seal design of bellows ensures the zero leakage of stem and provides more -reliable performance and no maintenance.

◆ Technical Features

Size : 2"~16” 
Class :150LB~600LB 

End : RF , RTJ , BW ,Etc .

Extended Bonnet for Cryogenic Service (On Request)
Material : WCB/LCB/LCC/CF8M/CF8 etc...(On Request)

◆ Design Specifications
Gate Valve Design: ASME B16.34 / API 600

Globe Valve Design: ASME B16.34 / API 623 / BS 1873

Face to Face: ASME B16.10
End: ASME B16.5/B16.47, ASME B16.25, MSS SP-44

Test: API 598
NACE: MR-01-75

Design for -196℃ Cryogenic Service is available : BS 6364 ,MSS SP-134 & MESC SPE 77/200 Etc.

◆ Main Components
The material available for the Body & Trim : Carbon Steel, Low Alloy , Stainless Steel, Duplex Steel ,Special Alloy , etc.

The material available for the Bellows : Austenitic Stainless Steel, Nickel-based Alloy , etc.

◆ Benefits

-Long cycle life bellows (3000 cycles) in Gr. 316Ti  stainless ,Inconel for special applications, or Hastelloy C for some special services .

-Non-rotating stem prevents torsion of bellows.

-Two-secondary stem seals: a) Stem backseat; b )API 624 stem packing.

-Wedge/Seating hardfaced with CoCr alloy for long life

-Two or three section bellows assembly.