Low temperature butterfly valve

Low temperature valves refer to valves that can be used under low temperature conditions. Valves with operating temperatures below -40 ℃ are usually referred to as low-temperature valves. Low temperature valves include low-temperature ball valves, low-temperature gate valves, low-temperature globe valves, low-temperature butterfly valves, low-temperature check valves, etc. They are mainly used in chemical plants such as 300000 tons of ethylene and liquefied natural gas. The output liquid low-temperature media, such as ethylene, liquid oxygen, liquid hydrogen, liquefied natural gas, liquefied petroleum products, etc., are not only flammable and explosive, but also need to be gasified during heating. During gasification, the volume expands hundreds of times. Low temperature valves are one of the indispensable and important equipment in industries such as petrochemicals, air separation, and natural gas. The quality of these valves determines whether they can be produced safely, economically, and sustainably.

Item NO.:
XUVAL33-297
Lead Time:
45 Days
Product Orgin:
CHINA
Brand:
XUVAL
Shipping Port:
Shanghai
Payment:
100%TT
Color:
silvery
MOQ:
5

Products Details

Product Usage: Low temperature gate valves are suitable for low-temperature media such as methane, liquid natural gas, hexene, carbon dioxide, liquid ammonia, liquid oxygen, liquid nitrogen, and liquid hydrogen.

Product features:
Low temperature gate valves generally do not use a long neck structure for temperatures above -50 ℃. For gate valves below -50 ℃, the neck length T is generally 500mm, or determined according to our company's design and calculation. Low temperature gate valves are mainly used to output liquid low-temperature media such as ethylene, liquid oxygen, liquid hydrogen, liquefied natural gas, liquefied petroleum products, etc. They are not only flammable and explosive, but also need to be gasified during heating, and the volume expands hundreds of times during gasification.

The material of liquefied natural gas valves is very important. If the material is not qualified, it can cause external or internal leakage of the shell and sealing surface; The comprehensive mechanical performance, strength, and rigidity of the components cannot meet the usage requirements or even break. Causing the leakage of liquefied natural gas medium and causing explosions. Therefore, in the process of developing, designing, and developing liquefied natural gas valves, material is the primary and critical issue. The valve body and valve cover adopt LCB (-46 ℃), LC3 (-101 ℃), CF8 (304) (-196 ℃)

The low-temperature gate valve produced undergoes special low-temperature treatment, placing the rough machined parts in the cooling medium for several hours (2-8 hours) to release stress, ensure the low-temperature performance of the material, ensure the precision machining size, and prevent leakage caused by temperature changes during low-temperature working conditions. Its characteristics are as follows

1. To prevent abnormal pressure rise in the middle chamber, a pressure relief hole is installed on the inlet side of the gate.

2. Determine the top length of the valve cover based on the working temperature of the valve to ensure reliable sealing of the valve stem packing.

3. Reasonably select materials for fillers, gaskets, and other components based on the working temperature.

4. Strictly control the chemical composition and mechanical performance indicators such as low-temperature impact toughness of materials.

5. Adopting various piping flange standards and sealing surface types, suitable for various engineering needs.

Nominal Diameter	Main external dimensions and connection dimensions
Nominal Diameter	L	D	D1	D2	b	Z-d	H	DO
DZ40Y-16L
20	150	105	75	55	14	4-14	320	140
25	160	115	85	65	14	4-14	350	160
32	180	135	100	78	16	4-18	385	180
40	200	145	110	85	16	4-18	420	200
50	250	160	125	100	16	4-18	540	240
65	270	180	145	120	18	4-18	610	240
80	280	195	160	135	20	8-18	690	280
100	300	215	180	155	20	8-18	780	300
125	325	245	210	185	22	8-18	930	320
150	350	280	240	210	24	8-23	980	360
200	400	335	295	265	26	12-23	1180	400
250	450	405	355	320	30	12-25	1390	450
300	500	460	410	375	30	12-25	1620	560
350	550	520	470	425	34	16-25	1810	640

Model		DZ40Y-16	DZ40Y-25
Working pressure(MFa)		1.6	2.5
Temperature(℃)		LC3>-101,LCB>-46,LCC -46,1Cr18Ni9Ti -196
Material	Valve body, gate, valve cover, bracket	C3、LCB、LCC、1Cr18Ni9Ti
	filler	Asbestos rope soaked in tetrafluoroethylene
	handwheel	QT450-10
	stem nut	ZCuA110Fe3
	valve stem	1Cr18Ni9Ti
	shim	Low-temperature asbestos

Hot tags :

Low temperature elastic sealing structure butterfly valve Manual low-temperature butterfly valve Gear low-temperature butterfly valve Low temperature hydraulic butterfly valve Low pressure butterfly valve

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