Bellow Seal Globe Valves
Our Product
B ellow seal Valves are maintenance free and energy saving product compared to Piston Valves and Conventional Valves. Typical applications include:- Chlorine, Ammonia, Steam, Thermic fluids, Pesticides, Fatty Acid, Nuclear Waste etc. are just a fraction of the many possible uses. "Zero-Stem" Leakage design eliminates product losses, hazards to humans and the environment and costly downtime ordinarily required for packing maintenance
COMPARISON BETWEEN BELLOW SEAL & PISTON VALVES
Bellow Seal Valves |
Piston Valves |
|
Primary stem seal |
Metallic Bellow |
Piston ring |
Secondary stem seal |
Gland Packing |
None |
Stem Leakage |
Not Possible since Metallic Bellows are designed to last several thousand cycles |
Occurs as soon as the rings (which are made of gasket material)wear out. |
Packing Replacement |
Not applicable |
Rings need to be changed frequently |
Replacement Cost |
Not applicable |
Very high |
Media Loss |
Zero Loss. As the isolation is by metallic bellows,leakage (in ppm) is not possible. |
Large in case of leaks |
Equipment Downtime |
Nil |
Very high for replacing rings |
Maintenance Cost |
Nil |
High as rings need to be changed at least once in six months |
Valve Life |
High- in years |
Low |
Safety |
Can be used safely for almost any media |
Can be used for limited media like steam, hot water |
Cost |
Comparatively higher initially but lowest total cost of ownership |
High compared to the benefits viz a viz problems |
SPECIFICATIONS- CAST STEEL GLOBE VALVE-IBR & NON IBR |
||
DESIGN |
BS 1873 |
|
FACE TO FACE |
ASME B16.10 |
|
FLANGE |
ASME B 16.5 |
|
PRESSURE RATING |
CLASS 150- DN15 TO DN300 |
|
TESTING |
BS 6755 PART-2/ API 598 |
|
BODY & BONNET |
ASTM A216 Gr. WCB, |
|
TRIMS-SEAT DND DISC |
ST6 H.F |
|
METAL BELLOW |
HYDRA SS 316 TI / SS 316 L |
|
STEM |
SS 410/ SS 304 /SS 316 |
|
GLAND PACKING(SECONDARY ) |
PURE GRAPHITE |
|
GASKET |
SPIRAL WOUND/CAF |
|
SPECIFICATIONS-FORGED STEEL GLOBE VALVE IBR & NON IBR |
||
DESIGN |
API 602 |
|
END TO END |
ASME B16.10 |
|
PRESSURE RATING |
CLASS 800- DN 15 TO DN 40 |
|
TESTING |
BS 6755 PART-2/ API 598 |
|
BODY & BONNET |
ASTM A105 |
|
TRIMS-SEAT DND DISC |
13% CR H.F / ST6 H.F |
|
STEM |
SS 410 |
|
BELLOW |
HYDRA SS 316 TI / SS 316 L |
|
GLAND PACKING(SECONDARY ) |
PURE GRAPHITE |
|
GASKET |
SPIRAL WOUND GASKET/CAF |
|
