BELLOW SEAL GATE 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 GATE VALVE

DESIGN

API 600

FACE TO FACE

ASME  B16.10

FLANGE

ASME B 16.5

PRESSURE RATING

CLASS 150- DN15 TO DN400
CLASS 300-DN15 TO DN200

TESTING

BS 6755 PART-2/ API 598

BODY & BONNET

ASTM A216 Gr. WCB,
ASTM A351 Gr. CF8/CF8M

TRIMS-SEAT DND WEDGE

13% Cr. H.F/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 Gate VALVE

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 WEDGE

CA15/13%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