The Stellited Seat Bellow Sealed Flanged Gate Valve is a premium industrial valve designed for zero leakage and extended service life in critical applications. It combines a stellite hardfaced seat—a cobalt-chromium alloy—to provide exceptional erosion, corrosion, and wear resistance under high-temperature and high-pressure conditions, with a bellow sealed stem that eliminates fugitive emissions by providing a hermetic barrier against fluid escape. The flanged ends ensure robust, bolted connections for easy installation and maintenance. This valve is ideal for power plants, refineries, chemical processing, and steam systems where environmental compliance, safety, and long-term reliability are paramount. Its design ensures tight shut-off, minimal maintenance, and superior performance in demanding thermal cycling environments.
Technical Attributes & Specifications
1. **Bellows Material:** Multi-ply Stainless Steel (SS304, SS316L, or Inconel).
2. **Seating Surface:** Hard-faced with Stellite (Cobalt-based alloy) for extreme hardness.
3. **Body Material:** Carbon Steel (WCB), Stainless Steel (CF8/CF8M), or Alloy Steel.
4. **Leakage Performance:** Zero fugitive emissions (TA-Luft or ISO 15848 certified).
5. **Connection Type:** Raised Face (RF) or Ring Type Joint (RTJ) flanges.
6. **Pressure Class:** PN16 to PN160 or ASME Class 150 to 900.
7. **Temperature Range:** -29°C up to 600°C (depending on body material).
8. **Stem Seal:** Dual sealing system (Bellows + Secondary safety graphite packing).
9. **Design Standard:** API 600, API 602, or EN 10434.
10. **Face-to-Face:** ASME B16.10 or EN 558 series.
11. **Stem Design:** Non-rotating rising stem to prevent bellows torsion.
12. **Bellows Life:** Designed for a minimum of 5,000 to 10,000 full cycles.
13. **Flow Characteristic:** Full-bore design for maximum Flow Coefficient ($C_v$).
14. **Gate Type:** Flexible wedge to ensure tight sealing under varying pressures.
15. **Bonnet Type:** Bolted bonnet with high-integrity gasket.
16. **Operation:** Handwheel, gear operator, or electric/pneumatic actuator.
17. **Maintenance:** Integrated grease nipple for stem lubrication.
18. **Testing Standards:** API 598 or EN 12266-1.
19. **Safety:** Integrated travel limiter to prevent over-compression of the bellows.
20. **Applications:** High-pressure steam, vacuum service, and heat transfer fluids.
Contact: Jorge Yang
Phone: +86-13588258503
E-mail: sales@fluvalve.com
Whatsapp:+86-13588258503
Add: Room 331, South Building,Building 1, No.3 Jinpeng Street, Sandun Town, Xihu District, Hangzhou City, Zhejiang Province
