Ultra low temperature fixed shut-off ball valve-Ball valve series-球阀厂家-上海冠环阀门制造有限公司

Product Overview

The ultra-low temperature fixed cut-off ball valve adopts a fixed ball structure. The ball core adopts full bore, with high rated flow coefficient and low flow resistance. The surface of the ball core is hardened using a special process to make it smooth and wear-resistant. The sealing material of the valve seat is polytetrafluorochloro Z-ene, which has low wear of the valve seat, excellent sealing, long service life, and extremely strong cutting performance. Widely used in low-temperature and cryogenic control such as metallurgy, oxygen production, petroleum, chemical engineering, etc.

Product Structure Features

1. Pressure parts of the material can withstand the temperature changes caused by the medium expansion, shrinkage, the structure of the sealing part of the temperature changes will not produce permanent deformation. For the following conditions -100 ℃, the valve parts should be cryogenic treatment before finishing, the parts will be immersed in a liquid nitrogen tank for cooling, when the temperature reaches -192 ℃ parts, start holding 1-2h, and then removed Natural treatment to the room temperature, review cycle 2 times.

2, the valve cover with long structure, its purpose to protect the function of stuffing box, the stuffing box at a farther position from the low temperature to ensure the sealing effect of packing, but also can be wound cold insulation material to prevent loss of cold energy. Long neck neck length according to the use of temperature and cold insulation material to choose a different length. When the packing sealing effect is reduced, you can add the grease from the middle of the packing box to form the oil seal layer, reducing the pressure difference of the packing box and improving the sealing performance.

3, the use of temperature below -100 ℃, the stem material after chrome or nitriding, improve the stem surface hardness and improve the reliability of packing seal.

4, the low temperature ball valve to prevent abnormal pressure structure, due to the low temperature valve gasification, the rapid expansion of its volume, the pressure will rise abnormally, when the valve cavity pressure rises, the valve cavity and import connectivity, or the valve inlet Pressure relief valve placed at the end to ensure the safe use of the valve.

5, low temperature ball valve gasket with at room temperature, low temperature conditions and temperature changes can be reliable sealing and recovery.

Product main dimensions

Product number	Nominal diameter	PN1.6-2.5MPa								WT
Product number	DN	L	D	D1	D2	b	Z-Φd	H	W	(kg)
DQ41F-16C	15	130	95	65	45	14	4-Φ14	178	140	3
	20	140	105	75	55	14	4-Φ14	184	160	4
	25	150	115	85	65	14	4-Φ14	195	180	5
DQ41F-16P	32	165	135	100	78	16	4-Φ18	280	250	9
	40	180	145	110	85	16	4-Φ18	280	300	11
	50	203	160	125	100	16	4-Φ18	300	350	15
	65	222	180	145	120	18	4-Φ18	330	350	19
	80	241	195	160	135	20	8-Φ18	360	400	27
DQ9B41F-16C	100	305	215	180	155	20	8-Φ18	400	500	38
	125	356	245	210	185	22	8-Φ18	430	600	58
	150	394	280	240	210	24	8-Φ23	500	800	81
	200	457	335	295	265	26	12-Φ23	680	800	95
DQ9B41F-16P	250	533	405	355	320	30	12-Φ25	790	1300	140