Bellow Sealed Valve

Flanged End 1/2” – 24”
Butt Weld End 1/2” – 24”
Threaded End 1/4” – 4”
Socket Weld End 1/4” – 4”


Bellow Sealed Valves are a new breed of industrial Process valves, designed to eliminate valve leakage and are also known as Zero Leak Valves or Emission Free Valves. In these valves, conventional gland packing is appended /supplemented by a metallic Bellow Cartridge joined to the valve bonnet at one end, and the stem at the other end. A bellow is a long accordion-like tube. As the valve stem strokes, the bellow expands or compresses with the stroke movement. The stem is fully covered with metallic bellow in wet zone, process  fluid never reach to the gland area. Thus the fluid will enter the valve from the seat of the valve & come in contact with the bellow, but will not come in contact with the stem. Since the stem is the only moving part in the valve, it is a source of potential leakage through the gland due to constant friction caused by the axial movement. In a bellow sealed valve this potential leak through gland is totally avoided due to the metallic bellow which blocks the leak path effectively by not allowing the media to come in contact with the stem and thus the gland. A bellow is the heart of this type of valve. We use only formed bellows, as in spite of being more expensive than welded bellows, their life is many times more than welded bellows.


Critical Media Where Bellow Sealed Valves are used

• Bellow Sealed Valves were invented specially for use in Nuclear Plants for preventing radioactive emissions from valves.

A. Nuclear & Thermal Power Industry
Heavy Water
High pressure Steam
High temperature application etc.
B. Chemical & Petrochemical Industry
Ammonia Freon
Hydrogen Thermic Fluids (Dowtherm, Santotherm)
Phosgene Various Acids
Chlorine Cryogenics etc.
C. Food & Pharmaceutical Industry
Vegetable Oils Parathion
Cynide compounds Oxygen
Hydrocarbon Nitrogen
Fatty acids Argon etc.

D. General Industries
Apart from above industries there is wide range of industries such as Refineries, Natural Gas, LPG & LNG, Synthetic,
Paper & Pulp and Industrial plants such as fertilizers, plastics, paints, shipping, rubber, cement. These industries typically
includes all kind Hazardous & Corrosive Chemicals & Heat Transfer Media like :
• High & Medium pressure Steam • Hot Oils like Dowtherm, Therminol, Santotherm etc. • Hot Water / Condensate etc.

Valves for Special Application:-
Jacketed Valves
Regulating Valves
Three-Way Valves
Manifold Valves
Vacuum Valves
Bellow Seal Bellow Operated
Cryogenic Valves
Needle Valves
Valves for Special Application:-
Precision finish seat & surface
Zero emission (Class”A”)
Fire Safe Design
Suitable for vacuum service
Easy Replacement
Additional Odor & Safety Measure