Q611F-16P Pneumatic Internal Thread High Platform Two Piece Ball Valve

The DQ641F-40P/C cryogenic pneumatic ball valve features a forged stainless steel or duplex steel body, a DIB-2 dual-seal seat, and an overpressure relief system. Designed for use in storage, transportation, and handling systems for media such as ethylene, LNG, and liquid oxygen at -196°C, it ensures reliable sealing and safe operation in cryogenic conditions.

Product Description

Product Overview

DQ641F-40P/C Type Double acting pneumatic stainless steel floating ultra-low temperature forged steel ball valve, using 304/316 stainless steel or duplex steel material forged valve body, multiple sealing and DIB-2 valve seat combination design, floating ball structure, overpressure relief system and other innovative technologies, extending the distance between the valve stem and valve cover, isolating the valve stem seal from the influence of low temperature. Valves suitable for opening and closing ultra-low temperature medium transportation systems such as ethylene, liquefied natural gas (LNG) plants, oxygen, liquid nitrogen, liquid argon, carbon dioxide low-temperature storage tanks and tank trucks, natural gas LPG02LNG storage tanks, air separation equipment, and petrochemical tail gas separation equipment at -196 ℃.

Performance Characteristics

The long neck valve cover structure isolates the packing box from the low-temperature position, ensuring the sealing effect of the packing and making it easier to wrap the insulation material. It has the function of protecting the packing box and preventing the loss of cold energy of the low-temperature valve.
The gasket used for low-temperature ball valves has reliable sealing and recovery properties at room temperature, low temperature state, and temperature changes.
When the operating temperature is below -100 ℃, the valve stem material is treated with chrome plating or nitriding to increase the surface hardness of the valve stem and improve the reliability of the packing seal.
The low-temperature ball valve is designed with a structure to prevent abnormal pressure rise. A pressure relief valve is installed at the inlet end of the valve, which can effectively prevent the pressure in the valve chamber from rising and ensure the safe use of the valve.
When used in working conditions below -100 ℃, valve parts should undergo cryogenic treatment before precision machining, which involves immersing the parts in a liquid nitrogen tank for cooling.

Implementation Standards

Design And Manufacturing	Structural Length	Flange Dimensions	Testing And Inspection
GB12237-89	GB/12221-89	JB/T82.1-94	GB/T13927-92

Performance Specifications

Nominal Pressure	PN		MPa
	PN	PN16, 25
Strength Test Pressure	PT	2.4 / 3.8	MPa
Low-Pressure Airtightness Test Pressure	0.6
High-Pressure Airtightness Test Pressure	1.8 / 2.8
Applicable Media	Q41F-(16~25)C Water, Oil, Gas	Q41F-(16~25)P Nitric Acid	Q41F-(16~25)R Acetic Acid
Applicable Temperature	-40℃ ~ 180℃

Materials List

Part Name	Q41F-(16~25)C	Q41F-(16~25)P	Q41F-(16~25)R
Valve Body	WCB	ZG1Cr18Ni9Ti CF8	ZG1Cr18Ni12MO2Ti CF8M
Valve Bonnet	WCB	ZG1Cr18Ni9Ti CF8	ZG1Cr18Ni12MO2Ti CF8M
Ball	1Cr18Ni9Ti 304	1Cr18Ni9Ti 304	1Cr18Ni12Mo2Ti 316
Valve Stem	1Cr18Ni9Ti 304	1Cr18Ni9Ti 304	1Cr18Ni12Mo2Ti 316
Seal Ring	PTFE
Packing	PTFE

Dimensions

DN	INCH	L	D	K	D1	N-Φ	C	W
Class 150 (1/2”~24”)
15	1/2”	108	90	60.3	45	4-14	14	135
20	3/4”	117	105	75	58	4-14	14	135
25	1”	127	115	85	68	4-14	14	165
32	1-1/4”	140	135	100	78	4-18	16	165
40	1-1/2”	165	140	110	78	4-18	16	165
50	2”	178	160	125	102	4-18	16	210
65	2-1/2”	190	180	145	122	4-18	18	240
80	3”	203	195	160	138	8-18	20	260
100	4”	229	215	180	158	8-18	20	320
125	5”	356	245	210	185	8-18	22	520
150	6”	394	280	240	210	8-23	24	600
200	8”	457	335	295	265	12-23	26	800
250	10”	533	405	355	320	12-23	30	1000
300	12”	610	460	410	375	12-23	30	1200
350	14”	686	535
400	16”	762	595
450	18”	864	635
500	20”	914	700
600	24”	1067	815
Class 300 (1/2”~24”)
15	1/2”	108	90	60.3	45	4-14	14	135
20	3/4”	117	105	75	58	4-14	14	135
25	1”	127	115	85	68	4-14	14	165
32	1-1/4”	140	135	100	78	4-18	16	165
40	1-1/2”	165	140	110	78	4-18	16	190
50	2”	178	160	125	102	4-18	16	210
65	2-1/2”	190	180	145	122	4-18	18	240
80	3”	203	195	160	138	8-18	20	260
100	4”	229	215	180	158	8-18	20	320
125	5”	356	245	210	185	8-18	22	520
150	6”	394	280	240	210	8-23	24	600
200	8”	457	335	295	265	12-23	26	800
250	10”	533	405	355	320	12-23	30	1000
300	12”	610	460	410	375	12-23	30	1200
350	14”	686	535
400	16”	762	595
450	18”	864	635
500	20”	914	700
600	24”	1067	815
Class 600 (1/2”~24”)
15	1/2”	108	90	60.3	45	4-14	14	135
20	3/4”	117	105	75	58	4-14	14	135