1. Bellows Sealed Parallel Double Wedge Cast Steel Gate Valve combines parallel double wedge shut-off structure and metal bellows stem sealing structure to achieve zero external leakage at the stem.
2. The valve is designed in compliance with API 600, ASME B16.34 and TA-Luft low fugitive emission standards, and is suitable for toxic, hazardous and volatile high-temperature media.
3. Materials of valve body, wedge and bellows can be selected according to corrosion and temperature working conditions.
4. It is applied in chemical and coal chemical plants to shut off toxic and hazardous media and prevent medium fugitive emission through stem packing.
1. Parallel double wedge with wedge expanding mechanism automatically compensates sealing surface wear for stable sealing performance.
2. Metal bellows isolates medium from packing to achieve low fugitive emission and protect personnel and environment.
3. Backup packing is equipped as secondary safety protection to provide safeguard under bellows failure condition.
4. Hard alloy is hardfaced on wedge and seat for high temperature resistance, wear resistance and erosion resistance.
5. The bellows has passed fatigue cycle test, suitable for service with multiple opening and closing cycles.
6. Non-rotatable stem extends bellows service life.