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Wenzhou Goldtop Valve Co.LTD
Wenzhou Goldtop Valve Co.LTD

Gold top valve  located in Oubei Town, Wenzhou, China,where can make all kinds of precision balls,including top entry,metal seat and V type balls.On this base,our products range of floating,trunnion,Gate globe check valve ,butterfly valve ,etc.Surely we can design them by customer's special requirements.

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Extended Bonnet Low Temperature Ball Valve PTFE RPTFE Seat LNG BS5352

Extended Bonnet Low Temperature Ball Valve PTFE RPTFE Seat LNG BS5352

  • Extended Bonnet Low Temperature Ball Valve PTFE RPTFE Seat LNG BS5352
  • Extended Bonnet Low Temperature Ball Valve PTFE RPTFE Seat LNG BS5352
Extended Bonnet Low Temperature Ball Valve PTFE RPTFE Seat LNG BS5352
Product Details:
Place of Origin: 中国
Brand Name: GOLD TOP
Certification: API 6D
Payment & Shipping Terms:
Minimum Order Quantity: 1 pcs
Price: Price to be negotiated in person.
Packaging Details: Plywood Case
Delivery Time: 30 days
Supply Ability: 100+pcs+30 days
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Detailed Product Description
SIZE: 1/2''-24'' Material: Cast Steel Forged Steel
Design Std: API 6D Entry: Side Entry
Stem: Blow Out Proof Seats: PTFE / RTFE / PEEK
High Light:

three way ball valve

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fixed ball valve

Extended Bonnet Floating Low Temperature Ball Valve PTFE RPTFE Seat LNG BS5352
 
Cryogenic ball valves
 
Cryogenic service ball valves have recently been gaining popularity. There are two types of design for cryogenic service ball valves according to their seat construction. One is the floating ball design and the other is the trunnion mounted ball design. The floating ball design is usually used for smaller sizes (8 inch and smaller) and lower pressure classes (class 300 and lower) because of its simple seat structure. For the floating ball design, the seal is made on the downstream side. PTFE is commonly used for the ball seats, the same material as used for standard ball valves.
 
As mentioned earlier, in this design, the seal is made on the downstream side when the ball is pressed against the downstream side by line-pressure. However, the seal is made on the upstream side by using the repulsion of the ball seal itself when the differential pressure is low. For ball valves used for ambient temperature service, the same ball seats are used on the both upstream and downstream side, and therefore flow directions are not limited. But for valves used for low temperature service, it is common for the ball to be provided with a vent hole on the upstream side, which prevents the buildup of excessive cavity pressure.
 
Although PTFE is superior in its low friction coefficient and high corrosionresistance against many fluids, good characteristics as an effective material for a ball seat, it has higher linear expansion coefficient than metals. For this, the ball seats tend to tightly hold the ball when they shrink at low temperature, which increases the resistance between the ball and the ball seats, resulting in higher operation torques. The larger the valves are, the more significantly the ball seat shrinks.
 
Cryogenic ball valves 
 
Application standards
  1. Design and manufacture conform to BS5352 
  2. Socket welded ends conform to ANSI B16.11 , JB/T1751
  3. Screw ends conform to ANSI B1.20.1, JB/T7306
  4. Butt-welded ends conform to ANSI B 16.25 ,  JB/T12224
  5. Flanged ends conform to ANSI B16.5 , B79
  6. Test and inspection conform to: API598 , GB/T13927 , JB/T9092
  7. Bolted bonnet , three-pipce
  8. Main materials: A105 , LF2 , F5 , F11 , F22 , 304(L) , 316(L) , F347 , F321 , F91 , Monel , 20 Alloy
 
Main part materials list
No.
Part name
LF2/304
LF3/304
F304(L)
304(L)
F316(L)
316(L)
F51
F51
1
Body
LF2
LF3
F304(L)
F316(L)
F51
2
Seat
PTFE
PTFE
APTFE
APTFE
APTFE
4
Stem
304
304
304(L)
316(L)
F51
5
Gasket
PTFE
PTFE
PTFE
PTFE
PTFE
11
Gland flange
LF2
LF2
304
304
304
14
Flat nut
8
8
8(M)
8(M)
8M
15
Nameplate
AL
AL
AL
AL
AL
18
Packing
PTFE&
Flexible graphite
PTFE&
Flexible graphite
PTFE&
Flexible graphite
PTFE&
Flexible graphite
PTFE&
Flexible graphite
37
Screwed stud
L7
L7
B8
B8M
B8M
38
Nut
8
8
8(M)
8(M)
8M
40
Ball
F304
F304
F304(L)
F316(L)
F51
42
Back seat gasket
PTFE
PTFE
PTFE
PTFE
PTFE
43
Wrench
ANSI 1025
ANSI 1025
ANSI 1025
ANSI 1025
ANSI 1025
44
Socket head cap bolt
B8
B8
B8
B8M
B8M
46
Locating piece
ANSI 1025
ANSI 1025
ANSI 1025
ANSI 1025
ANSI 1025
49
Left bonnet
LF2
LF3
F304(L)
F316(L)
F51
50
Right bonnet
LF2
LF3
F304(L)
F316(L)
F51
52
Elastic washer
304
304
304
316
316
54
Screwed plug
LF2
LF3
304(L)
316(L)
F51

Contact Details
Wenzhou Goldtop Valve Co.LTD

Contact Person: sales

Tel: +8613758447235

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Wenzhou Goldtop Valve Co.LTD
Tel:86-577-86621729
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