Cryogenic Ball Valves

Short Description:

Cryogenic Ball Valves: Overview, Structural Features & Technical ParametersCryogenic Ball Valves are suitable for various pipelines, used to cut off or connect media in the pipelines. By selecting...

Product Name: -196℃ Low Temperature Ball Valve
Valve Category: Ball Valves
Brand: Yiluoke
Technical Data: DN15-DN600
Made In: China
Supplier: Xiamen Yiluoke Import and Export Trading Co., Ltd

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Product Detail

Cryogenic Ball Valves are suitable for various pipelines, used to cut off or connect media in the pipelines. By selecting different materials, they can be applied to different temperatures and media respectively, with a minimum operating temperature of -196℃. The actuation modes of Cryogenic Ball Valves include manual, worm gear drive, pneumatic or electric. Cryogenic Ball Valves generally adopt flange, welding or thread connection.

Structural Features

Structure of Cryogenic Ball Valve

This valve is a full-bore floating ball valve, featuring compact structure, beautiful appearance and small flow resistance coefficient.
The sealing surface is made of fluoroplastic, and the material matching of the seal pair is reasonable, ensuring a long service life.
The ball and PTFE valve seat are tightly sealed, with zero leakage function. It can use its plastic deformation to automatically compensate for errors caused by wear, achieving good sealing performance and long service life. To ensure the sealing at the valve stem, a stuffing box and a gland are added on the valve body for sealing.
Various piping flange standards and flange sealing surface types can be selected, as well as various actuation modes such as manual, worm gear drive, electric, pneumatic, hydraulic, etc., to meet different user needs.

Structural Design & Manufacturing Characteristics

Cryogenic ball valves are divided into two types: cryogenic floating ball valves and cryogenic trunnion mounted ball valves. For operating temperatures higher than -50℃, the extended neck structure is generally not adopted. For ball valves working below -50℃, the standard neck length is set to 250mm.

Cryogenic ball valves are mainly used for transporting low-temperature liquid media including ethylene, liquid oxygen, liquid hydrogen, liquid nitrogen, liquid ammonia, liquid propane, liquefied natural gas (LNG) and liquefied petroleum products. These media are flammable and explosive, and will expand several times in volume when vaporized due to temperature rise, requiring strict low-temperature resistance and sealing performance of the valve.

Principle of Cryogenic Ball Valve

Material Selection

Material selection is the core factor for liquefied natural gas valves. Unqualified materials will cause external or internal leakage of the valve body and sealing surface, and fail to meet the mechanical performance, strength and stiffness requirements under extreme low-temperature working conditions, which may even lead to component fracture and medium leakage, further causing explosion risks.

The main materials for valve body and bonnet are specified as below:

LCB: Applicable for working temperature down to -46℃
LC3: Applicable for working temperature down to -101℃
CF8 (304): Applicable for working temperature down to -196℃

Cryogenic Treatment Process

All self-produced cryogenic valves are treated with professional special cryogenic processing. Rough-machined parts are placed in cooling medium for 2 to 6 hours to release internal residual stress, stabilize the low-temperature mechanical properties of materials, ensure machining dimensional accuracy, and prevent valve deformation and leakage caused by temperature fluctuation under long-term cryogenic service conditions.

Technical Standards

Item	Standard
Design Basis	GB Standard
Design Standard	GB12237-89
Face-to-Face Dimension Standard	GB12221-89
Flange Connection Standard	GB/T 9113-2000, JB/T79-94
Inspection & Test Standard	JB/T 9092-99

Main Component Material Configuration & Temperature Range

No.	Part Name	ASTM A352 LCB (≥-40℃)	ASTM A352 LC3 (≥-101℃)	ASTM F304(L) (≥-196℃)	ASTM F316(L)
1-2	Valve Body / Bonnet	A352 LCB	A352 LC3	A182 F304(L)	A182 F304(L)
3	Stud Bolt	A193 L7 (Cadmium Plated)	A193 B8	A193 B8	A193 B8M
4	Nut	A194 L7 (Cadmium Plated)	A194 8	A194 8	A194 8M
5,8	Sealing Ring / Gasket	RTFE + Cu Powder / Nylon 1010 / PPL
6	Ball	A182 F304	A182 F304(L)	A182 F304(L)	A182 F316(L)
7	Valve Stem	A182 F304	A182 F304(L)	A182 F304(L)	A182 F316(L)
9,10	Thrust Washer / Packing	RTFE + Cu Powder / Nylon 1010 / PPL / Carbon Fiber
11	Gland	A105N	A351 CF8	-	-
12	Positioning Plate	A182 F321
13	Flat Nut	A194 4 (Cadmium Plated)	A194 8	A194 8	A194 8
14	Handwheel	A193 L7 (Cadmium Plated)	A193 B8	A193 B8	A193 B8
15	Cylindrical Pin	Q235A

Conventional Main Parts Material

Valve Body: 0Cr18Ni9
Ball: 0Cr18Ni9
Valve Stem: 0Cr18Ni9
Packing & Sealing Ring: PTFE

Product Dimension & Weight Specification (Model: DQ41F-40P)

Unit: mm

Model	DN	L	H	D	D1	D2	D6	Z-d	b	D0
DQ41F	15	130	180	95	65	45	40	4-14	16	140
DQ41F	20	150	220	105	75	55	51	4-14	16	160
DQ41F	25	160	230	115	85	65	58	4-14	16	180
DQ41F	32	180	310	135	100	78	66	4-18	18	200
DQ41F	40	200	320	145	110	85	76	4-18	18	200
DQ41F	50	230	400	160	125	100	88	4-18	20	250
DQ41F	65	290	420	180	145	120	110	8-18	22	320
DQ41F	80	310	500	195	160	135	121	8-18	22	320
DQ41F	100	350	520	230	190	160	150	8-23	24	360
DQ41F	125	400	600	270	220	188	176	8-25	28	500
DQ41F	150	480	620	300	250	218	204	8-25	30	700
DQ41F	200	600	720	375	320	282	260	12-30	38	900