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 , 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.

Application standards

Design and manufacture conform to BS5352
Socket welded ends conform to ANSI B16.11 , JB/T1751
Screw ends conform to ANSI B1.20.1, JB/T7306
Butt-welded ends conform to ANSI B 16.25 , JB/T12224
Flanged ends conform to ANSI B16.5 , B79
Test and inspection conform to: API598 , GB/T13927 , JB/T9092
Bolted bonnet , three-pipce
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