A351 CF8 304 Bellow Seal Control Valve Supplier in India

Bellow Seal Valves contain a rising stem, non rising handwheel, yoke and yoke cap, one piece bonnet forging, flanged or forged ends, grease nipple with lubricant baking, packing gland, long bellows, bonnet and the seats. The valve is essentially a gate valve which is supported but the bellows. The long rising stem goes all the way from inside valve body to the hand wheel. The Bellow Seal Gate Valves are used in high pressure systems and are connected to the pipes with flanged connections. The connection can also be by means of socket, welded or NPT threaded ends of the pipes. There are different type of bellow seal valves which are not gate valves. The Bellow Seal Globe Valves use a globe with opening on one horizontal axis which aligns with the pipes to open the valve and then against the pipes to close the valve.

Stainless Steel Bellow Seal Ball Valve

Stainless Steel Bellow Seal Ball Valve

A351 CF8 304 Bellow Seal Control Valve

A351 CF8 304 Bellow Seal Control Valve

SS 304 Bellow Seal Needle Valve

SS 304 Bellow Seal Needle Valve

View Bellow Seal Valves Price, Leading Supplier of bellow seal gate valves.

The valves can be made up of different material grades such as 304, 316, stainless steel, cast iron, carbon steel and ductile iron material. The different components of the Bellow Seal Safety Valves can be made up of different material grades as well. There are control valves, safety valves and check valves in this type of valves. The Bellow Seal Check Valves can range in size and dimensions according to different API standards. The size of the valves can range from ½ inches to 48 inches and the pressure ratings vary according to the size and standards as well. The applications are in water, oil and gas, petroleum, petrochemical, chemical and food processing industrial applications.

 

Specification Table of Bellow Seal Valves

Size 50NB — 600NB
Pressure 150PS1
Temperature 0 Deg C - 1200 Deg C.
Body , Chest Solid One piece casting of Cast Iron Fg 260, Cast Steel Gr WCB ,CF8,CF8M.
Seat Integral to Body, Soft, Optional.
Gate AISI SS 304,316,316L,317,317L
Screw Spindle AISI SS 410,304,316.
Nut Brass
Yoke Plate type of MS .
Gland Follower Cast Iron , Cast steel , Ductile Iron ,CF8,CF8M.
Hand Wheel Cast Iron , Cast steel , Ductile Iron
Gland Packing PTFE , PTFE Impregnated
Ends Lugged
Port STANDARD [Round], Optional V Port, Diamond Port,.

Manufacturing Standard of Bellow Seal Gate Valves

  • Design : ASME B16.34 / BS 5352 / API 600 / BS 1873 / API 602
  • Face to End : DN 3202
  • End to End: BW / Flanged
  • End Flange : ASME B16.5 / DIN / BS / IS
  • TestAPI 598 / BS 6755
  • Bellow : Inconel / SS / Hast Alloy
  • Seat: Metal to Metal / Metal to soft Seat

Bellows Seal Valve Working Principle

An accordion-like metal tube fastened to the valve stem and to the bonnet, forming a leak-proof seal with negligible friction. The accordion ribs give the bellows seal valve an ability to stretch and compress with a sliding stem’s linear motion. Since the bellows is an uninterrupted metal tube, there is no place at all for leaks to develop.

Test Pressure of Bellow Sealed Globe Valves

Test Pressure in bar (psi)
Pressure rating
Class 300
Class 150
Hyd. Shell
31
78
Seat
23
58
Air Seat
7

Material & Parts of Bellow Sealed Globe Valves

Materials
Body / Bonnet / Stuffing Box
Carbon Steel ASTM A216 Gr. WCB, Stainless Steel ASTM 351 Gr. CF8 / CF8M
Yoke / Gland Flanges
Carbon Steel ASTM A216 Gr. WCB
Seat Ring / Disc Plug Type / Disc Nut
Stainless Steel ASTM A276 Type 304 / 316 / 410
Body Seal
PTFE / S.W.G. 316
Body Stud / Gland Stud
ASTM A193 Gr. B7 / B8 / B8M
Gland Packing
PTFE
Gland / Spindle / Split Washer
Stainless Steel ASTM A276 Type 304 / 316 / 410
Hand Wheel / Indicator
S.G.IRON
Bellow
Stainless Steel ASTM A276 Type 316 Ti / 321
Surface Protection for Carbon Steel Valves
Prime Coat : Chlorine free with modified alkyd resin, unobjectionable in physiological & toxicological respects, with additional external coating of machine varnish light blue.

Manufacturers of bellow seal globe and safety valves in India

Bellow Sealed Globe Valves Dimensions

Dimensions are in mm (inch)
SIZE
A CLASS
C CLASS
150
300
D CLASS
150
300
D1
E
Wt 1)CLASS
150
300
mm
150
300
   
15
108
152
322
320
150
150
15
5.0
8.0
20
117
178
322
320
150
150
19
6.0
9.0
25
127
203
353
357
200
200
25
8.0
12.0
32
140
216
380
390
200
200
32
11
15
40
165
229
460
458
250
250
38
16
27
50
203
267
498
501
250
250
50
19
36
65
216
292
530
540
300
300
65
27
43
80
241
318
635
641
350
350
76
43
51
100
292
356
737
750
350
450
102
69
72
150
406
444
850
950
300
152
125
142
200
495
559
1000
1020
300
203
142
175
250
622
622
1120
1130
600
254
195
215
300
698
711
1680
1730
600
305
240
270

Bellows-Sealed Valves Working Pressure

Working Pressure up to 1000 psig (68.9 bar)

Temperature Range of Bellow Seal Valves

Temperature Range –20 to 900° F (–28 to 482°C)

Various Bellow Seal Valves Types

Stainless Steel 304 Bellow Seal Globe Valve

Stainless Steel 304 Bellow Seal Globe Valve

CF8 Stainless Steel Bellow Seal Gate Valve

CF8 Stainless Steel Bellow Seal Gate Valve

CF8M Stainless Steel Bellow Seal Ball Valve

CF8M Stainless Steel Bellow Seal Ball Valve

ASTM A351 CF8M 316 Bellow Seal Control Valve

ASTM A351 CF8M 316 Bellow Seal Control Valve

Stainless Steel 316 Bellow Seal Needle Valve

Stainless Steel 316 Bellow Seal Needle Valve

A351 CF8 304 Bellows Valve

A351 CF8 304 Bellows Valve

Flow Coefficient of Bellow Seal Gate Valves

Flow Coefficient 0.12 to 1.2

Bellows Seal Valve Internal Volume

Internal Volume 0.10 to 0.26 in3 (1.6 to 4.3 cm3)
View bellow seal check valves Pressure Rating, Stockholder of bellow seal needle valve

Sizes Range of Bellows-Sealed Valves

Sizes Range 1/4 to 3/4 in

Class 800 Bellow Seal Valves Dimensions

800 LB. FULL PORT – BOLTED BONNET
SIZE     inch, mm 1/4, 6 3/8, 10 1/2, 15 3/4, 20 1, 25 1 1/4, 32 1 1/2, 40 2, 50
A             inch, mm 3.15, 80 3.15, 80 3.54, 90 4.33, 110 5, 127 5, 127 5, 127 8.27, 210
B open      inch, mm 9.05, 230 9.05, 230 9.64, 245 11.22, 285 13.19, 335 14.96, 380 16.42, 417 20.87, 530
C             inch, mm 3.46, 88 3.46, 88 3.46, 88 3.82, 97 5.43, 138 5.43, 138 5.43, 138 6.77, 172
F              inch, mm .31, 8 .38, 9,6 .55, 14 .71, 18 .94, 24 1.18, 30 1.44, 36,6 1.89, 48
G             inch, mm 1.26, 32 1.26, 32 1.50, 38 1.89, 48 2.20, 56 2.52, 64 3.07, 78 3.35, 85
Weight       lb. Bolted  B.    kg 6, 2,7 6, 2,7 6.25, 2,9 10, 4,6 15.75, 7,2 22, 10 28.25, 12,8 48.5, 22
Weight       lb. Welded B.  kg 5, 2,3 5, 2,3 5.5, 2,5 8.25, 3,8 13.5, 6,2 18.5, 8,4 24.5, 11,2 44, 20
PACKING BH2 BH2 BH2 BH4 BH5 BH6 BY5 BH8
GASKET* G2 G2 G2 G3 G4 G6 G7 G9

Class 1500 Bellow Seal Valves Dimensions

1500 LB. FULL PORT – BOLTED BONNET
SIZE     inch, mm 1/2, 15 3/4, 20 1, 25 1 1/2, 40 2, 50
A             inch, mm 4.33, 110 5, 127 5, 127 8.27, 210 9.05, 230
B open      inch, mm 13.98, 355 14.96, 380 17.72, 450 21.65, 550 23.23, 590
C             inch, mm 5.43, 138 5.43, 138 6.77, 172 9.21, 234 12.6, 320
F              inch, mm .55, 14 .71, 18 .94, 24 1.44, 36,6 1.89, 48
G             inch, mm 1.89, 48 2.20, 56 2.52, 64 3.35, 85 3.74, 95
Weight       lb. Bolted  B.    kg 11, 5 15.5, 7 21, 9,5 51.75, 23,5 88, 40
Weight       lb. Welded B.  kg 10, 4,5 14.25, 6,5 18.25, 8,3 48.5, 22 81.5, 37
PACKING BH5 BH6 2B4 2B5 9B8
GASKET* G2 G3 G4 G7 G8

Comparison Between Bellow Seal & Piston Valves

Primary stem seal of Bellow Seal Valves is Metallic Bellow While Piston Valves have Piston ring

Stem Leakage is Not Possible since Metallic Bellows. While in Piston valve it Occurs as soon as the rings wear out

Check bellow sealed Stop Valve and Control valves Price List.

Advantages of Bellow Seal Valves

  • Stringent fugitive emission Laws
  • Environment Protection Laws
  • Air Purification or Clean Air Act.
  • Greenhouse Effect Prevention Bill
  • Energy conservation Law