Q641F-16C Pneumatic National Standard Carbon Steel Two Piece U-shaped High Platform 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 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.
Performance specification
| Valve Pneumatic Actuator | Cylinder Type | Dual action actuator、Spring return action |
| Air Pressure | 4~8bar、5~8bar Dual action actuator 4~8bar、Spring return action 5~8bar | |
| Applicable Temperature | -20℃~80℃ | |
| Explosion Proof Model(Optional) | dIIBT4 Explosion-proof class: dIIBT4 | |
| Signal Feedback(Optional) | X1 mechanical passive signal, X2 active signal | |
| Manual Function(Optional) | Optional wheel,manual switch~&close valve function | |
| Regulation Model(Optional) | 4~20mAinput signal, realizing adjustment function | |
| Ball Valve | Product Specifications | 1/2″〜4″ |
| Nominal Pressure | PN16、PN25、PN40、PN69 | |
| Design And Manufacturing | GB/T-12224、GB/12237、ANSIB16.34 | |
| Inspection And Testing | GB/T-13927、JB/T9092、API598 | |
| Strength Test Pressure | PT2.4、3.8、6.0、9.6MPa | |
| Low-pressure Gas Seal Test Pressure | 0.6MPa | |
| Applicable Medium | Q681F-(16-64)C:Water、Gas、Oil,Etc. | |
| Q681F-(16-64)P:Nitric Acid | ||
| Q681F-(16-64)R:Acetic Acid | ||
| Applicable Temperature | -20℃~180℃ |
Material list

| No. | Part Name | Material | No. | Part Name | Material |
| 1 | Body | WCB/CF8/CF8M | 8 | V Type Packing | PTFE |
| 2 | Seat | PTFE+15%FV | 9 | Gland | SS304 |
| 3 | Bonnet | WCB/CF8/CF8M | 10 | Handle | SS304 |
| 4 | Valve Cover Gasket | SS304 | 11 | Spring Washer | SS304 |
| 5 | Ball | SS304/SS316 | 12 | Handle Nut | SS304 |
| 6 | Valve Stem | SS304/SS316 | 13 | Handle Cover | PLASTIC |
| 7 | Thrust Washer | PTFE | — | — | — |
Overall dimensions
| SIZE | L | D | G | f | T | C | K4 | K3 | K2 | K1 | W | H3 | H2 | H1 | d | NXΦ | |
| 1/2″ | DN15 | 130 | 95 | 45 | 2 | 14 | 9 | 42 | 50 | 6 | 7 | 143 | 40 | 9 | 52.5 | 65 | 4-14 |
| 3/4″ | DN20 | 140 | 105 | 55 | 2 | 14 | 9 | 42 | 50 | 6 | 7 | 143 | 40 | 9 | 54.5 | 75 | 4-14 |
| 1″ | DN25 | 150 | 115 | 65 | 2 | 14 | 11 | 42 | 50 | 6 | 7 | 180 | 40 | 11 | 58.5 | 85 | 4-14 |
| 1¼” | DN32 | 165 | 135 | 78 | 2 | 16 | 11 | 42 | 50 | 6 | 7 | 180 | 40 | 11 | 71 | 100 | 4-18 |
| 1½” | DN40 | 180 | 145 | 85 | 3 | 16 | 14 | 50 | 70 | 7 | 9 | 224 | 45 | 14 | 76 | 110 | 4-18 |
| 2″ | DN50 | 200 | 160 | 100 | 3 | 16 | 14 | 50 | 70 | 7 | 9 | 224 | 45 | 14 | 90 | 125 | 4-18 |
| 2½” | DN65 | 220 | 180 | 120 | 3 | 18 | 17 | 70 | 102 | 9 | 11 | 290 | 50 | 17 | 107 | 145 | 8-18 |
| 3″ | DN80 | 250 | 195 | 135 | 3 | 20 | 17 | 70 | 102 | 9 | 11 | 290 | 50 | 17 | 118 | 160 | 8-18 |
| 4″ | DN100 | 280 | 215 | 155 | 3 | 20 | 17 | 70 | 102 | 9 | 11 | 290 | 50 | 17 | 138 | 180 | 8-18 |
Product Commitment
- Quality commitment: All types of valves provided by our factory are designed, manufactured, tested and accepted in accordance with relevant domestic standards such as GB, JB, SH, HG, CJ, as well as international standards such as ANSI, JIS, BS, DIN, etc;
- Supply commitment: Ruiward Valve guarantees to provide brand new defect free products, as well as relevant drawings and other technical documents related to the products, to ensure that users have no worries during use;
- Service commitment: The product warranty period is 12 months from the date of delivery, and the “three guarantees” service (return, replacement, and repair) is implemented.
Ruiward valve products are exported to Europe, America, Southeast Asia and other countries with reasonable prices, stable quality, and perfect after-sales service. It is your trusted brand. Welcome to call 86-577-88937087 for inquiries!
Ordering Instructions
- If the product model of Ruiward Company has been selected by the design unit, please order directly from our sales department or affiliated regional business office according to the model;
- If the model has not been selected before ordering, please provide us with the following usage parameters: ① nominal diameter (DN), ② fluid properties (including nominal pressure (Mpa), temperature (℃), pressure difference before and after the valve, connection method (thread, flange, clamp), viscosity or acidity, etc.), ③ valve body and core materials;
- Product driving modes: manual, worm gear, self operated, pneumatic, electric, etc;
- Product standards: National Standard GB, Japanese Standard JIS, American Standard ANSI, German Standard DIN, British Standard BS, European Standard EN, etc;
- When the application is very important or the pipeline is complex, please provide design drawings and detailed parameters as much as possible, and the technical team of Ruiward Company will review and control them for you;
- Our company provides a quotation list and technical standard specifications for customer confirmation, and the contract will be drafted after both parties confirm the technical aspects.
Fill in the form below and our team will be happy to assist you
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