Product Description
1. Bellows sealed cast steel globe valve uses metal bellows to isolate the stem, eliminates external leakage risk at stem packing and achieves TA LUFT low emission sealing.
2. Valve design complies with ASME B16.34 and BS 1873 standard, applied for toxic, hazardous and volatile media.
3. Material of body, disc and bellows can be selected according to corrosion and temperature working conditions, bellows are supplied with fatigue cycle verification.
4. Widely used in chemical, coal chemical and pharmaceutical plants to prevent outward emission of toxic media from valve stem.
Features & Benefits
1. Metal bellows separate medium from packing, block medium leakage from stem packing and meet low emission requirements.
2. Bellows pass fatigue test, suitable for frequent opening and closing cycle working conditions with safe operation.
3. Stem packing acts as secondary protection to provide safeguard when bellows are damaged and improve equipment safety level.
4. Hard alloy overlay on disc and seat, high temperature resistance and wear resistance, available for shut off and throttling regulation.
5. Forged stem is equipped with back seal structure for reliable sealing and preventing stem ejection under internal pressure.
6. Stem surface nitriding treatment provides good corrosion resistance and anti galling property with stable operating torque.
7. Rising stem, handwheel non rising type. Rolling bearings are equipped for medium and large bore for easy opening and closing.
8. For nominal pressure Class800 and above, pressure self tightening bonnet structure is adopted for valve cavity. Bonnet sealing performance improves with rising pressure to guarantee reliable sealing.
