bellow seal valve
Bellow Seal Valve
Armstrong BELLOW SEAL VALVE is provided with STELLITED INTEGRAL SEAT – A FIRST IN THIS CATEGORY OF VALVES.It reduces torque required to open & close the valve, gives fine regulation also.
- Available in SW/Threaded 15mm to 40mm, forged with ASTM 105 material.
- Flanged Class 150 and Class 300 in all sizes ranging from 50NB to 300 NB with ASTM A 216 WCB material.
- Sizes more than 10 inch considering the ease of operation gear operated Bellow seal valve option available and recommended.
- All valves are IBR certified.
- Four Points of sealing with Integral Seat with Stelliting Back seat arrangement Bellow of S316, Ti MOC Spiral wound gasket ZERO Leak Rate: to < 1X10-6.
WHY BELLOW SEAL VALVE?
It has been proven through various studies about process plant emissions that over 75%of the leakages are occurring through valves in pipelines. These Leakages cause: i. Environment Pollution ii. Production Loss iii. Process Loss iv. Energy Loss In line with the present emphasis on prevention of Environmental pollution and Energy savings it is Imperative that these emissions/leakages be totally plugged. Further todays competitive market forces also demand that the processes be improved and production losses and costs be cut down for survival.
Bellow Seal Valve Design Features:
- Long Life Multiply Bellows
- Improved Body-Bonnet Joints.
- Rising Stem so no Torsion of Bellows.
- Two Secondary Stem Seals:
- Backseat in open position
- Gland Packing
- Stellite Hard Faced.
- Non rising hand wheel pressure relief plug for 200mm(8”) & Above
- Available in Cast & Forge Constructions.
- Sizes from 15mm(1/2”) to 300mm(12”)
- Ends Flanged /BW/SW/Screwed.
- Mfg standard BS 1873 / ASME B16.34 / IBR
- Testing to API 598, EN – 12266
- Bellow Cycle life as per MSS SP 117
- Special welded valves can be given for thermic fluid application
Highlights Of Bellow Seal Valves
- Prevention of Leakage Across Ports can be achieved by providing stellite integral seat and stellite plug
- Three seals provided in series to prevent leakage to atmosphere i) Metallic bellow ii) Spiral wound gasket between valve body and bonnet iii) Gland Packing iv) Doubled seated bellows
- Stem leakage is not Possible since Metallic Bellows are designed to last several thousand cycles
- Primary stem seal is Metallic Bellow , Secondary stem seal is Gland Packing
- Special welded valves can be given for thermic fluid application
- Special aero-dynamic design plug hardened to 250 BHN suitable for throttling & Special SS 316 with Titanium used for bellows giving long life, high corrosion resistance and high resistance to impingement attack
- Easy to open and close due to low torque required to operate the valve & Indicating stem design helps in detecting whether the valve is open/closed/partially open.
- Suitable for applications where regulation of flow is required & can be used safely for almost any media
