One of the most frequent and serious problems valve face is gland leakage,results in wasted and increased plant downtime . Apart from the high cost of energy losses, Gland leakages can also cause serious environmental , ecological and health hazards to plant workers and personnel , Leakage of sensitive material can also constitude to a fire hazard , explosion, or damage to equipment by corrosive material . Air entering the pipeline could produce inflammable explosive or poisonous mixtures. Gland packed valves ofen demand continual maintenance in accessibility creating particular difficulties . The bellows complies to conditions at high temperatures and are capable of withstanding over 10,000 cycles without failure.
Technical specification
Design standard: DIN 3356
Face to face dimension: DIN 3202
Flanged ends: DIN 2543-2545
Test & inspection: DIN 3230
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Main part materials
| NO. | Part name | Material |
| 1 | Body | GS-C25,GGG-40G,1.4401 |
| 2 | Seat | 1.4301,Stellite |
| 3 | Disc | 1.4021,1.4401+Stellite |
| 4 | Stem | 1.4021,1.4401 |
| 5 | Bellows | 1.4301,1.4401 |
| 6 | Gasket | Flexible Graphite+stainless steel |
| 7 | Bonnet | GS-C25,GGG-40G,1.4401 |
| 8 | Bolt | A193-B7,A193-B8 |
| 9 | Nut | A194-2H,A194-8 |
| 10 | Packing | Flexible graphite |
| 11 | Packing Gasket | 1.4021,1.4401 |
| 12 | Gland | 1C45,1.4401 |
| 13 | Locator | 1C25 |
| 14 | Pin | 1C35 |
| 15 | Stem nut | Alloy steel,Copper alloy |
| 16 | Handwheel | Carbon steel |
| 17 | Cap | 1C35 |
| Nominal Pressure | PN | ||
| Test Pressure | Strength test | 1.5PN | MPa |
| Sealing test | 1.1PN | ||
| Gas seal test | 0.6 | ||
| -- | -- | ||
| Suitable temp | -196ºC~600ºC | ||















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