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Bellows Sealed Globe Valve
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Bellows Sealed Globe Valve

Bellows Sealed Globe Valve

A bellows sealed globe valve closes with a disc that lifts straight off one seat ring and seals the stem with a welded bellows instead of a packing gland. Three numbers settle most orders on this build: 699 mm face to face at DN 300 Class 150, against 356 mm on the gate valve it replaces; ISO 5208 Rate D on the Stellited metal seat, with Rate A reachable only on a soft insert at 250 °C and below; and a closing thrust stated in kN on an ISO 5210 frame, because a multi-turn valve takes no ISO 5211 mount. The standard build is cast ASTM A351 CF8, tabulated from DN 50 to DN 300 in Class 150 and Class 300, with Class 600 issued on the general arrangement.
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A bellows sealed globe valve is a multi-turn valve in which a welded metal bellows surrounds the stem and carries the pressure boundary, so no packing is asked to seal against a sliding surface. The closure is a disc that lifts straight off a single seat ring, which is the structural difference from a gate valve: the globe disc never slides on the seat, and it can be held part open without the disc sitting in the flow path. API 602 covers the forged and small cast construction, API 600 the flanged steel globe valves, and ASME B16.34 the wall thickness and the pressure-temperature rating behind both; the build on this page is cast ASTM A351 CF8, dimensioned from DN 50 to DN 300 in Class 150 and Class 300.

 

Design Standard

Item Standard
Basic Design API 602/API 600/ASME B16.34
Face to Face/End to End ASME B16.10
End Flange ASME B16.5
Pressure-temperature Rating ASME B16.34
Inspection and Test API 598

 

design features

1.Exclusively designed bellows sealed globe valve has a sealing combination featured by using double walls stainless steel bellows as the stem seal elements and graphite packing as seal accessory to prevent leakage.
2. No fluid loss or reducing energy loss, and improving safety of plant equipment.
3. Being the key component, double wall bellows sealing keeps the valve free from leakage and maintenance.
4.Stellited sealing surface offers a long, corrosion resistant service.

 

Specifications

The table is the standard build as it leaves the works: cast ASTM A351 CF8 body and bonnet, ASTM A182 F304 trim with Stellited seating faces, double wall 304 bellows, graphite packing above it. Every line below appears again on the material list and on the drawing, so a substitution is visible rather than implied.

Standard build, bellows sealed globe valve
Parameter Range or value Where it is fixed
Design standard API 602 / API 600 / ASME B16.34 API 602-2014, API 600, B16.34-2017
Size range, dimensioned DN 50 to DN 300 (NPS 2 to NPS 12) B16.10 globe pattern
Size range, drilled NPS ½ to NPS 20 in Class 150; NPS ½ to NPS 12 in Class 300 and 600 B16.5 flange tables below
Pressure class, dimensioned Class 150 and Class 300 ASME B16.34
Pressure class, tested Class 150, 300, 600, 800 and 1500 API 598, two test tables below
Body and bonnet ASTM A351 CF8 B16.34 Group 2.2; BOM items 1 and 7
Disc, seat ring, stem ASTM A182 F304, seating faces Stellited BOM items 2, 3 and 6
Bellows ASTM A276 304, double wall BOM item 20
Packing Graphite, above the bellows BOM item 12
Gaskets SS304 + graphite, two joints BOM items 8 and 17
End flange RF or RTJ, B16.5 drilling ASME B16.5-2017
Face-to-face Globe pattern, not gate pattern ASME B16.10 Table 3
Seat leakage Rate D on the metal seat; Rate A with a soft insert ISO 5208:2015
Stem emission ISO 15848-1 Class B or Class C on request ISO 15848-1:2015
Pressure test Shell, seat, and 80 psig air seat API 598
Operator Handwheel standard; gear or multi-turn actuator ISO 5210 for the actuator flange

 

Bellows Sealed Globe Valve drawing

Bellows Sealed Globe Valve Drawing

Material of Construction

Item Part Name Material
1 Body ASTM A351 CF8
2 Seat ASTM A182 F304
3 Disc ASTM A182 F304
4 Thrust Washer ASTM A240 304
5 Disc Nut ASTM A276 304
6 Stem ASTM A182 F304
7 Bonnet ASTM A351 CF8
8 Gasket SS304+Graphite
9 Stud ASTM A193 B8
10 Nut ASTM A194 8
11 Pin ASTM A276 304
12 Packing Graphite
13 Packing Gland ASTM A276 304
14 Gland Flange ASTM A351 CF8
15 Eyebolt ASTM A193 B8
16 Nut ASTM A194 8
17 Gasket SS304+Graphite
18 Anti-rotation Plate ASTM A276 304
19 Yoke Arm ASTM A351 CF8
20 Bellows ASTM A276 304
21 Nut ASTM A194 8
22 Bolt ASTM A193 B8
23 Stem Nut ASTM A439 D-2
24 Gland ASTM A276 304
25 Handwheel Nut ASTM A276 304
26 Handwheel ASTM A47
27 Key Carbon Steel
28 End Fitting ASTM A276 304
29 Grease Nipple Carbon Steel (Galvanized)

 

Dimension &Weight

Bellows Sealed Globe Valve Dimension &Weight

CLASS 150

Size   D   L-RF   L-RTJ   W   H   Approx Weight  
DN NPS mm in mm in mm in mm in mm in kg lb
50 2 152 6.00 203 8.00 216 8.50 178 7.00 393 15.47 28 62
80 3 191 7.50 241 9.50 254 10.00 254 10.00 451 17.76 54 119
100 4 229 9.00 292 11.50 305 12.00 305 12.00 620 24.41 90 198
150 6 279 11.00 406 16.00 419 16.50 356 14.00 633 24.92 137 302
200 8 343 13.50 495 19.50 508 20.00 508 20.00 750 29.53 186 410
250 10 406 16.00 622 24.50 635 25.00 500 19.70 923 36.34 248 547
300 12 483 19.00 699 27.50 711 28.00 559 22.00 1265 49.80 304 670

 

CLASS 300

Size   D   L-RF   L-RTJ   W   H   Approx Weight  
DN NPS mm in mm in mm in mm in mm in kg lb
50 2 165 6.50 267 10.50 283 11.12 178 7.00 446 17.56 35 77
80 3 210 8.25 318 12.50 333 13.12 254 10.00 525 20.67 62 137
100 4 254 10.00 356 14.00 371 14.62 356 14.00 767 30.20 98 216
150 6 318 12.50 445 17.50 460 18.12 508 20.00 806 31.73 149 328
200 8 381 15.00 559 22.00 575 22.62 640 25.20 866 34.09 208 459
250 10 445 17.50 622 24.50 638 25.12 559 20.00 1106 43.54 282 622
300 12 521 20.50 711 28.00 727 28.62 650 25.60 1352 53.23 365 805

 

Pressure test to ASME B16.34&aPI 598 Specifications

SHELL MATERIAL: WCB, A105

Valve Pressure Class Minimum Test Pressures(psig)   Air Seat (psig)
  Shell Hydrostatic Seat Hydrostatic  
150 450 325 80
300 1125 800 80
600 2225 1650 80
800 2975 2125 80
1500 5575 4100 80

 

SHELL MATERIAL: CF8,CF8M

Valve Pressure Class Minimum Test Pressures(psig)   Air Seat (psig)
  Shell Hydrostatic Seat Hydrostatic  
150 425 325 80
300 1100 800 80
600 2175 1600 80
800 2900 2125 80
1500 5400 3975 80

 

FLANGE DIMENSIONS

FLANGE Drawing

CLASS 150 Steel Pipe

Nominal Size   D   C   d   T   E   Bolt Number
in mm in mm in mm in mm in mm in mm  
1/2 15 3.5 89 2.38 60.5 1.38 35 0.44 11.5 0.62 16 4
3/4 20 3.88 98 2.75 70 1.69 43 0.50 13.0 0.62 16 4
1 25 4.25 108 3.12 79.5 2.0 51 0.56 14.5 0.62 16 4
1 1/4 32 4.62 117 3.5 89 2.5 63.5 0.62 16.0 0.62 16 4
1 1/2 40 5.0 127 3.88 98.5 2.88 73 0.69 17.5 0.62 16 4
2 50 6.0 152 4.75 120.5 3.62 92 0.75(0.62) 19.1(15.9) 0.75 19 4
3 80 7.5 190 6.0 152.5 5.0 127 (0.75) (19.1) 0.75 19 4
4 100 9.0 229 7.5 190.5 6.19 157 0.94 23.9 0.75 19 8
6 150 11.0 279 9.5 241.5 8.5 216 1.0 25.4 0.88 22 8
8 200 13.5 343 11.75 298.5 10.62 270 1.12 28.6 0.88 22 8
10 250 16.0 406 14.25 362 12.75 324 1.19 30.2 1.0 26 12
12 300 19.0 483 17.0 432 15.0 381 1.25 31.8 1.0 26 12
14 350 21.0 533 18.75 476 16.25 413 1.38 35 1.12 29 12
16 400 23.5 597 21.25 539.5 18.5 470 1.44 36.6 1.12 29 16
18 450 25.0 635 22.75 578 21.0 533 1.56 39.7 1.25 32 16
20 500 27.5 698 25.0 635 23.0 584 1.69 42.9 1.25 32 20

Height of raised face is 0.06" (1.6mm) each, dimensions in ( ) are for valve flanges.

 

CLASS 300 Steel Pipe

Nominal Size   D   C   d   T   E   Bolt Number
in mm in mm in mm in mm in mm in mm  
1/2 15 3.75 95 2.62 66.5 1.38 35 0.56 14.5 0.62 16 4
3/4 20 4.62 117 3.25 82.5 1.69 43 0.62 16.0 0.75 19 4
1 25 4.88 124 3.5 89 2.0 51 0.69 17.5 0.75 19 4
1 1/4 32 5.25 134 3.88 98.5 2.5 63.5 0.75 19.5 0.75 19 4
1 1/2 40 6.12 156 4.5 114.5 2.88 73 0.81 20.7 0.88 22 4
2 50 6.5 165 5.0 127 3.62 92 0.88 22.3 0.75 19 8
3 80 8.25 210 6.62 168 5.0 127 1.12 28.6 0.88 22 8
4 100 10.0 254 7.88 200 6.19 157 1.25 31.8 0.88 22 8
6 150 12.5 318 10.62 270 8.5 216 1.44 36.6 0.88 22 12
8 200 15.0 381 13.0 330 10.62 270 1.62 41.3 1.0 25 12
10 250 17.5 445 15.25 387.5 12.75 324 1.88 47.7 1.12 29 16
12 300 20.5 521 17.75 451 15.0 381 2.0 50.8 1.25 32 16

Height of raised face is 0.25" (6.4mm) each.

 

CLASS 600 Steel Pipe

Nominal Size   D   C   d   T   E   Bolt Number
in mm in mm in mm in mm in mm in mm  
1/2 15 3.75 95 2.62 66.5 1.38 35 0.56 14.5 0.62 16 4
3/4 20 4.62 117 3.25 82.5 1.69 43 0.62 16.0 0.75 19 4
1 25 4.88 124 3.5 89 2.0 51 0.69 17.5 0.75 19 4
1 1/4 32 5.25 134 3.88 98.5 2.5 63.5 0.81 21.0 0.75 20 4
1 1/2 40 6.12 156 4.5 114.5 2.88 73 0.88 22.3 0.88 22 4
2 50 6.5 165 5.0 127 3.62 92 1.0 25.4 0.75 19 8
3 80 8.25 210 6.62 168 5.0 127 1.25 31.8 0.88 22 8
4 100 10.75 273 8.5 216 6.19 157 1.5 38.1 1.0 26 8
6 150 14.0 356 11.5 292 8.5 216 1.88 47.7 1.12 29 12
8 200 16.5 419 13.75 349 10.62 270 2.19 55.6 1.25 32 12
10 250 20.0 508 17.0 432 12.75 324 2.5 63.5 1.38 35 16
12 300 22.0 559 19.25 489 15.0 381 2.62 66.7 1.38 35 20

Height of raised face is 0.25" (6.4mm) each.

Note: The data in this sample may be changed due to product upgrades and other reasons. GNEE reserves the right to change the data without prior notice, and has no obligation to supplement or inform the products that have been sold.

 

test and inspection

valve-testing-workshop

Send the line size, the class and the quantity

 

FAQ

What sizes and classes does a bellows sealed globe valve cover?

DN 50 to DN 300 (NPS 2 to NPS 12) in ASME Class 150 and Class 300, which is the range tabulated for dimensions and weight. Flange drilling runs from NPS ½ to NPS 20 in Class 150 and to NPS 12 in Class 300 and 600, so smaller and larger bodies are quoted against the same standards; their body dimensions are issued on the drawing rather than in a table.

 

Can a bellows sealed globe valve be used for throttling?

Yes, within limits. The disc lifts clear of the seat and can be held part open, which a gate valve cannot do without eroding the wedge and rings. Continuous throttling at a high pressure drop erodes the disc and seat, and flashing or cavitation belongs to a control valve with a multi-stage trim.

 

Is the seat metal or soft, and what leakage rate does it hold?

Metal as standard, with the seat ring and disc faces Stellited (items 2 and 3 of the material list), and it is accepted at ISO 5208 Rate D, 0.1 × DN mm³/s, which is 10 mm³/s at DN 100. A PTFE or PPL insert in the disc reaches Rate A on the same body where the temperature is under 250 °C, because the disc lifts straight off the single ring with no sliding contact to drag the insert. A gate valve has no equivalent option: its wedge slides across two rings on every stroke.

 

Will a globe valve fit where a gate valve was installed?

Not without re-work. ASME B16.10 gives the two patterns different face-to-face dimensions, 203 mm against 178 mm at NPS 2 and 699 mm against 356 mm at NPS 12 in Class 150. A short pattern ball valve shares the gate valve dimension; a globe valve does not.

 

How much does a bellows sealed globe valve weigh?

A DN 100 (NPS 4) Class 150 valve weighs 90 kg (198 lb), and the same size in Class 300 weighs 98 kg (216 lb). At DN 300 (NPS 12) the figures are 304 kg (670 lb) for Class 150 and 365 kg (805 lb) for Class 300. Those are approximate weights with the handwheel fitted, so a lifting plan should use the figure on the packing list rather than the catalogue table.

 

What material is the standard build?

Body and bonnet are ASTM A351 CF8. The seat ring, disc and stem are ASTM A182 F304, with Stellited seating faces. The bellows is ASTM A276 304 in double wall, the packing above it is graphite, and the two bonnet gaskets are SS304 with a graphite filler. Studs and bolts are A193 B8 with A194 8 nuts.

 

Does a bellows valve still need packing above the bellows?

Yes, as a failure buffer. If a convolution or a weld fails, the graphite packing holds the joint until the next shutdown. Without it, and without a tell-tale port, a bellows failure has no warning layer and becomes an unplanned release.

 

What sets the temperature limit of a bellows sealed globe valve?

The bellows alloy and the seat, not the body. A CF8 body is an austenitic casting with no graphitisation limit of the kind that applies to carbon steel, but the standard 304 bellows is practical to about 425 °C and a PTFE insert to 200 °C. Above 425 °C the bellows moves to Inconel 625 and, if the carbon steel option is being used, the body moves to A182 F22 at the same time.

 

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