What Are Bellow Sealed Valves?

WHAT ARE BELLOW SEALED VALVES ?

     Bellow Sealed Valves are a new breed of Industrial Process valves,designed to eliminate Valves leakage and are also known as ‘Zero Leak Valves’ or ‘Emission Free Valves.’

       hese Valve , conventional gland packing is appended/supplemented by a metallic Bellow Cartidge 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 .There are no sliding or rotating through which process fluid can pass.  

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 by the axial movement.

     In a bellow sealed valve this potential leak 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.There are two types of bellows:

formed and welded leaf.A formed bellow is made by rolling a flat metal sheet into a tube with longitudinal fusion welding.This tube is then mechanically or hydraulically formed into bellows with rounded and widely spaced folds.

     In Welded Leaf-Bellows,washer like plates of thin metal are welded together.Welding is carried out on both inner and outer circumference of the washer like plate .A welded leaf bellow has more folds per unit length in comparison with formed Bellows. Thus, for  the  same  stroke  length ,mechanically formed Bellows are two to three times longer than their welded leaf counterparts. Reportedly mechanically formed bellows fail at random spots,while the welded leaf bellow usually fails at or near weld.

Why Bellow Sealed Valves?

Leakage from the valve gland is often a problem for the maintenance engineer. Losses incurred due to this type of leakage are considerable. Steam at 150 psi escapes through a gland with a clearance of 0.001 in. at a rate of 25 lb/hr. This means a loss of $1.2/8-hr shift and $1,100/yr. A tiny drop of 0.4 mm diameter/sec results in a waste of about 200 l/yr of costly oil or solvent. 

Apart from this high cost of energy and material loss, the leakage also results in serious environmental, ecological and oftne hazardous problems. The leaking fluid can be corrosive, explosive or poisonous. Ina any case, it has to be checked before it leaks. A bellows seal valve can be a simple solution to all these problems. 

Features Of Bellow Sealed Valves:

• Bellow Seal Valve comply with full condition at high temperature and high pressure. 

• Bellow Seal prevents leakage of sensitive media which constitute high fire risk. 

• Our bellows are capable of withstanding 8,000 cycles and above without failure under pressure. 

• Steam at pressure of 150 p.s.i.escapes through a stem / gland clearance of 1 / 1000th of an inch at a rate of 24 lbs per hour. 

• Gland packed valves often demand continual maintenance - inaccessibility creating particular difficulties.   

DIN BOLTED BONNET GATE VALVE F4 PN10 ,DIN BOLTED BONNET GATE VALVE F4 PN16 ,DIN BOLTED BONNET GATE VALVE F5 PN16 ,DIN BOLTED BONNET GATE VALVE F5 PN25 ,DIN BOLTED BONNET GATE VALVE F7 PN40 ,DIN BOLTED BONNET GATE VALVE F7 PN63,DIN BOLTED BONNET GATE VALVE F7 PN100,DIN PRESSURE SEALS BONNET GATE VALVE F8 PN100 ,DIN PRESSURE SEALS BONNET GATE VALVE F8 PN160 ,DIN PRESSURE SEALS BONNET GATE VALVE F8 PN250 ,DIN PRESSURE SEALS BONNET GATE VALVE F8 PN420 ,DIN BOLTED BONNET GLOBE VALVE F1 PN10 ,DIN BOLTED BONNET GLOBE VALVE F1 PN16 ,DIN BOLTED BONNET GLOBE VALVE F1 PN25 ,DIN BOLTED BONNET GLOBE VALVE F1 PN40 ,DIN BOLTED BONNET GLOBE VALVE F2 PN63 ,DIN,BOLTED BONNET GLOBE VALVE F2 PN100 ,DIN PRESSURE SEALS BONNET GLOBE VALVE F8 ,DIN PRESSURE SEALS BONNET GLOBE VALVE F8 PN160 ,DIN PRESSURE SEALS BONNET GLOBE VALVE F8 PN250 ,DIN PRESSURE SEALS BONNET GLOBE VALVE F8 PN320 ,DIN PRESSURE SEALS BONNET GLOBE VALVE F8 PN420 ,DIN BOLTED BONNET ANGLE GLOBE VALVE F32 PN10 ,DIN BOLTED BONNET ANGLE GLOBE VALVE F32 PN16 ,DIN BOLTED BONNET ANGLE GLOBE VALVE F32 PN25 ,DIN BOLTED BONNET ANGLE GLOBE VALVE F32 PN40 ,DIN BELLOWS SEAL STOP VALVES F1 PN10 ,DIN BELLOWS SEAL STOP VALVES F1 PN16 ,DIN BELLOWS SEAL STOP VALVES F1 PN25 ,DIN BELLOWS SEAL STOP VALVES F1 PN40 ,DIN BELLOWS SEAL ANGLE STOP VALVES F32 PN10 DIN BELLOWS SEAL ANGLE STOP VALVES F32 PN16 ,DIN BELLOWS SEAL ANGLE STOP VALVES F32 PN25 ,DIN BELLOWS SEAL ANGLE STOP VALVES F32 PN40 ,DIN BOLTED BONNET LIFT CHECK VALVE F1 PN10 ,DIN BOLTED BONNET LIFT CHECK VALVE F1 PN16 ,DIN BOLTED BONNET LIFT CHECK VALVE F1 PN25 ,DIN BOLTED BONNET LIFT CHECK VALVE F1 PN40 ,DIN BOLTED BONNET LIFT CHECK VALVE F2 PN63 ,DIN PRESSURE SEALS BONNET LIFT CHECK VALVE F2 PN100 ,DIN PRESSURE SEALS BONNET LIFT CHECK VALVE F8 PN160 ,DIN PRESSURE SEALS BONNET LIFT CHECK VALVE F8 PN250 ,DIN PRESSURE SEALS BONNET LIFT CHECK VALVE F8 PN320 ,DIN PRESSURE SEALS BONNET LIFT CHECK VALVE F8 PN420 ,DIN BOLTED BONNET SWING CHECK VALVE F6 PN10 ,DIN BOLTED BONNET SWING CHECK VALVE F6 PN16 ,DIN BOLTED BONNET SWING CHECK VALVE F1 PN16 ,DIN BOLTED BONNET SWING CHECK VALVE F1 PN25 ,DIN BOLTED BONNET SWING CHECK VALVE F1 PN40 ,DIN BOLTED BONNET SWING CHECK VALVE F2 PN63 ,DIN PRESSURE SEALS BONNET SWING CHECK VALVE F2 PN100 ,DIN PRESSURE SEALS BONNET SWING CHECK VALVE F8 PN160 ,DIN PRESSURE SEALS BONNET SWING CHECK VALVE F8 PN250 ,DIN PRESSURE SEALS BONNET SWING CHECK VALVE F8 PN320 ,DIN PRESSURE SEALS BONNET SWING CHECK VALVE F8 PN420 ,DIN Y-STRAINER F1 PN10 ,DIN Y-STRAINER F1 PN16 ,DIN Y-STRAINER F1 PN25 ,DIN Y-STRAINER F1 PN40

technical drawings download

API/ANSI Gate valve

DIN/EN Gate valve

Forged Steel Globe valve

API/ANSI Globe valve

DIN/EN Globe valve

through way globe valve

angle type globe valve

Y type globe valve

Forged steel Check valve

API/ANSI Swing Check valve

API/ANSI dual disc Check valve

API/ANSI Y-Strainer

(technical drawings download)

Forged Steel Bellows seal valve

API/ANSI Bellows seal Gate valve

API/ANSI Bellows seal Globe valve

DIN/EN bellows seal Globe valve

through way bellows seal globe valve

angle type bellows seal globe valve

Y type bellows seal globe valve

Non rising stem bellows seal globe valve

Forged steel Ball valve

API/ANSI Floating Ball valve

API/ANSI Trunnion Ball valve

Forged steel Gate valve

Knife Gate Valve

Flange Knife Gate Valve

Lug Knife Gate Valve

Inside Disc Knife Gate Valve

Inside Screw Knife Gate Valve

Slurry Gate Valve

Square Gate Valve

Through Conduit Knife Gate Valve

EB Wafer Knife Gate Valve

Bellow Sealed Valve

DIN Bellow Globe Valve

DIN Forged Bellow Globe Valve

Angle Type Bellow Globe Valve

Y Type Bellow Globe Valve

API Bellow Globe Valve

DIN Lift Check Valve

KSB Type Bellow Sealed Valve

DIN Y Type Strainer

Wafer Check Valve

Wafer Dual Plate Check Valve

Lug Wafer Dual Plate Check Valve

Inner Wafer Dual Plate Check Valve

Wafer Lift Check Valve

Wafer Single Disc Check Valve

Wafer Single Disc Swing Check Valve

DIN Standard Valve

DIN F5 Rising Stem Gate Valve

DIN F7 Rising Stem Gate Valve

DIN F4 Rising Stem Gate Valve

DIN F15 Non-Rising Stem Gate Valve

DIN F1 Globe Valve

DIN F2 Globe Valve

DIN F32 Angle Globe Valve

DIN F1 Swing Check Valve

DIN F6 Swing Check Valve

DIN F1 Lift Check Valve

DIN Cast Iron Valve

Ball Valve

Floating Ball Valve

Cast Trunnion Ball Valve

Forged Trunnion Ball Valve

3PC Forged Steel Ball Valve

Thread End Ball Valve

Top Entry Ball Valve

Full Welded Ball Valve

V Type Ball Valve

Gate Valve

Cast Steel Gate Valve

Pressure Seal Gate Valve

Plate Gate Valve

Cryogenic Gate Valve

Forged Steel Gate Valve

Forged Pressure Seal Gate Valve

Extended Body Gate Valve

Flanged End Gate Valve

Flanged End Pressure Seal Gate Valve

Forged Cryogenic Gate Valve

Globe Valve

Cast Steel Globe Valve

Pressure Seal Globe Valve

Forged Steel Globe Valve

Forged Pressure Seal Globe Valve

Y Type Globe Valve

Y Type Pressure Seal Globe Valve

Flanged End globe valve

Flanged End Pressure Seal Globe Valve

Forged Bellow Sealed Globe Valve

Forged Cryogenic Globe Valve

Check Valve

Cast Swing Check Valve

Pressure Seal Swing Check Valve

Wafer Swing Check Valve

Forged Swing Check Valve

Forged Piston Check Valve

Forged Pressure Seal Swing Check Valve

Forged Pressure Seal Piston Check Valve

Y Type Piston Check Valve

Flanged End Check Valve

Flanged End Pressure Seal Check Valv

Butterfly Valve

Wafer Soft Seal Butterfly Valve

Metal to Metal Butterfly Valve

Lug Wafer Butterfly Valve

High Performance Butterfly Valve

Welding Butterfly Valve

Hydraulic Counterweight Butterfly Valve

Plug Valve

Sleeve Plug Valve

Lubricated Plug Valve

Lift Plug Valve

Orbit Plug Valve

Steam Trap

Free Floating Semi-Ball Steam Trap

Free Floating Ball Steam Trap

Lever Floating Ball Steam Trap

Lift Floating Ball Steam Trap

Diaphragm Box Steam Trap

Inverted Bucket Steam Trap

Thermodynamic Steam Trap

Adjustable Homothermal Steam Trap

Strainer

API Y Type Strainer

T Type Strainer

Thread Y Type Strainer

Forged Y Type Strainer

Auto Discharging Strainer

Basket Strainer

U Type Strainer

Y Type Strainer

Needle valve

SS-6NVS14mm

12NPTF-N.V

SS-6NVM8-F8

SS-5PDF8

SS-5PDF8-M8

Diaphragm Valve

Weir Type Diaphragm Valve

Straight Through Diaphragm Valve

Thread Diaphragm Valve

Three Way Diaphragm Valve

Globe Y Type Diaphragm Valve

BS Diaphragm Valve

BS Pneumatic Diaphragm Valve

Electric Diaphragm Valve

Water Control Valve

100X Remote Control Float Ball Valve

200X Pressure Reducing Valve

300X Flow Control Chcek Valve

400X Flow control valve

500X Pressure Relief Or Sustaining Valve

600X Electrical Control Valve

700X Pump Control Valve

800X Pressure Difference Balance Valve

900X Emergency Shut-Off Valve

100D Water Level Valve

100S Mud valve

Flange & Fitting

W.N Type Flange

Slip On Type Flange

S.W Type Flange

Threaded Type Flange

Blind Type Flange

Big Size Flange

Elbow

Reducer

Tee

Cross

Stud End

Cap

Forged Fitting

Sanitary Fitting

Forged Fitting