Short Description

Model No.: bellow-seal-gate-valve

China Valves Manufacturer www.sfutube.com offers bellow seal gate valve.

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Key Specifications / Features

Type: Bellow Seal Gate Valve
Design & Manufactured to API 6D, ASME B16.34 or Equivalent
P.T Ratings to ASME B16.34
Face to Face dimensions to ASME B16.10
Flanged Ends to ASME B16.5
Butt-weld Ends to ASME B16.25
Threaded Ends to ASME B1.20.1
Socket-weld Ends to ASME B16.11
Valves Marking to MSS SP-25
Inspect & Tested to API 598
Size Ranges from 1 1/2” thru 24”
Pressure Ratings from Class 600 to Class 2500, PN110 to PN420
Structures in Bolted or Pressure Sealed Union Cover
Ends Connections in Flanged R.F or RTJ, Threaded NPT, BSPT, Welded S.W, B.W and Grooved
Body Materials available in Cast Carbon Steel, Low Temp. Carbon Steel, Alloy Steel, Stainless Steel, Monel, Alu. Bronze etc.
Trim Materials available in 13%Cr, F11, F22, SS304, SS304L, SS316, SS316L and other specials.

What are Bellow Seal Gate Valves

The opening and closing parts of the bellow seal gate valve are plug-shaped valve flaps with a flat or tapered sealing surface, and the valve flaps move in a straight line along the centerline of the fluid. The movement of the valve stem in the form of lift rod type (stem lift, handwheel does not lift), there are also lift rotary rod type (handwheel and stem together with the rotation of lift, the nut is located on the valve body). Bellows globe valve is only suitable for full opening and full closing, not allowed for regulation and throttling.
Bellow seal gate valve belongs to forced sealing type valve, so when the valve is closed, pressure must be applied to the valve flap to force the sealing surface not to leak. When the medium enters the valve body from below the valve flap, the resistance required to overcome the operating force is the friction of the stem and packing with the thrust generated by the pressure of the medium, the force to close the valve is greater than the force to open the valve, so the diameter of the stem should be large, otherwise the failure of the stem top bend will occur. In recent years, from the emergence of self-sealing valves, the media flow direction of the globe valve is changed from the top of the valve flap into the valve cavity, then under the action of media pressure, the force to close the valve is small, while the force to open the valve is large, the diameter of the valve stem can be reduced accordingly. At the same time, under the action of the medium, this form of valve is also tighter. China’s valve “three to” has stipulated that the flow direction of the shut-off valve, all use the top-down.
Bellow seal gate valve open, the opening height of the valve flap, 25% to 30% of the nominal diameter, the flow has reached the maximum, that the valve has reached the full open position. So the full open position of the globe valve should be determined by the stroke of the valve flap. Electric gate valve response is sensitive, safe and reliable, many of the high control requirements of the plant specifically for pneumatic instrumentation control elements set up compressed air station. The electric one is to be electric. And can control its flow rate of the device.
Bellow seal gate valve’s stem adopts bellows and packing double sealing structure to ensure leak-free sealing at the stem, which is used in power station, natural gas, ammonia, vacuum, refrigeration system, thermal oil, hot water system, especially suitable for flammable, explosive, toxic and precious media pipeline.
Structure of bellow seal gate valve.
Bellow seal gate valve bellows and bonnet and stem are welded into one, there is no seam, so no leakage, the action of the stem is caused by compression of the bellows and deformation, not by relative motion. Ordinary gate valve with packing seal, the stem and packing will slide between, in low temperature easy to leak (spool), bellow seal gate valve, there is no such problem.
1 1511251I030117 - Bellow Seal Gate Valve
Structure diagram of bellow seal gate valve
Bellow seal gate valve with stainless steel confined bellows that can be stretched and compressed to replace the packing seal, generally used for permeable media transmission, such as the valve on the hydrogen system, as long as the bellows is not damaged generally no external leakage; and general gate valve with packing to seal, prone to leakage.
Features of bellow seal gate valve.

  • 1. Bellow seal gate valve is double sealed, bellows (stainless steel) + packing, better safety performance, so it is often used in toxic media, flammable and explosive media, high temperature steam, hot oil and other systems.
  • 2. Small switching torque, relatively easy to switch, no flow resistance loss, long service life, beautiful appearance, etc.

We focus on valves in standard and special materials as customer request.
Our main materials show as the follows:
Any request for other materials, please contact our machinery sales or engineering team on email.

Special Material Titanium or Titanium alloy series Titanium (Gr.2,Gr.3,Gr.5,Gr.7,Gr.12)
Nickel alloy series Ni6,Ni200,Ni201
Monel 400,Monel k500
Inconel 600/625/690/750
Incoloy 800/825/800H/800HT
Hastelloy B3/C/C4/C22/C276/G30
Zirconium alloy series Zirconium 702/703/705
Bronze alloy series Nickel aluminum bronze C95800
(Super) Duplex Steel ASTM F51/F53/F55
Other corrosion resistance Alloy 20,AISI 321,310,904L
Normal Material Carbon Steel WCB,WCC,LCB,LCC,A105N,LF2
Alloy Material (Low Temperature) LC1,LC2,LC3,LF3
Alloy Material (High Temperature) WC1,WC6,WC9,C5,C12A
Stainless Steel CA15,CF8,CF8M,CF3,CF3M

Dimensions of Bellow Seal Gate Valve

 20211016081557 68722 - Bellow Seal Gate Valve

Valve Sizes(Inch) 15 20 25 40 50 65 80 100 150 200 250 300 350 400
Face To Face #150 108 118 127 165 203 216 241 292 406 495 622 699 787 941
#300 153 178 203 229 267 292 318 256 445 559 622 711 838 965
Flange Dia. #150 89 98 108 127 152 178 191 229 279 343 406 483 533 597
#300 92 118 124 156 165 191 210 254 318 381 445 521 584 648
Raised face Dia. #150 35 43 51 73 92 105 127 157 216 270 324 381 413 470
#300 35 43 51 73 92 105 127 157 216 270 324 382 413 470
Flange PCD. #150 60 70 79 98 121 140 152 191 241 298 362 432 476 540
#300 67 83 89 114 127 149 168 200 270 330 387 451 514 572
Flange Thk. #150 11 13 14 18 19 22 24 24 25 29 30 32 35 67
#300 14 16 18 21 22 25 29 32 37 41 48 51 54 57
Raised face Thk. #150 1.6 1.6 1.6 1.6 1.6 1.6 1.6 1.6 1.6 1.6 1.6 1.6 1.6 1.6
#300 1.6 1.6 1.6 1.6 1.6 1.6 1.6 1.6 1.6 1.6 1.6 1.6 1.6 1.6
No. Of Holes/ Dia. #150 4/16 4/16 4/16 4/16 4/19 4/19 4/19 8/19 8/22 8/22 12/25 12/25 12/29 12/29
#300 4/16 4/19 4/19 4/22 8/19 8/22 8/22 8/22 12/22 12/25 16/29 16/32 20/32 20/32

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