Listing ID #4243853
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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 |