DQ641F-40P/C Pneumatic two-piece ultra-low temperature forged steel ball valve
The DQ641F-40P/C Pneumatic two-piece 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.
Product Overview
The DQ641F-40P/C Pneumatic two-piece 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 ℃.
Unique Advantages
- The casting has passed the German TUV certification and is precision cast with silica sol, with a delicate and beautiful appearance.
- Completely equivalent valve body cavity, direct flow channel, low fluid resistance, and its resistance coefficient is equal to that of pipes of the same length.
- The protruding design of the valve stem prevents blowing and leakage, making it safer.
- Anti static structure design ensures that the current between the ball core, valve stem, and valve body is guided outward to avoid static accidents.
- The V-shaped design of the valve stem packing tightens with increasing pressure, and the packing pressure ring plane is precision machined to achieve zero leakage sealing.
- The V-shaped packing, O-ring, and packing pressure ring form a triple seal, which has good self sealing effect.
- The spring disc compensation design is designed to adapt to the wear of the sealing packing ring, and the automatic elastic compensation effect reduces leakage.
- Easy maintenance, simple ball valve structure, easy disassembly and replacement, standard Japanese Daikin M111 seal, guaranteed quality, and easier replacement and procurement.
- Elastic valve seat design, with elastic contact between the valve seat and the sphere, strong sealing performance, controllable sealing pressure ratio, providing elastic avoidance for the sphere to rotate, uniform operating torque without jamming, and smoother switching.
- The unique valve body structure is organically combined with the valve seat and sphere. When the valve is fully open or fully closed, the sealing surfaces of the sphere and valve seat are completely isolated from the medium, which will not cause erosion of the valve sealing surface and has a longer service life.
- The sunken cover design allows for adjustable compression of the packing portion, making maintenance more convenient.
- Easy to operate, ISO5211 high platform international standard, compatible with various types of valve pneumatic actuators and valve electric actuators at home and abroad, providing convenience for remote control.
- Ruiward is a source manufacturer with excellent CNC machining technology. The design and machining dimensions strictly follow industry standards and 6S, CE, TS, ISO9001, ISO14000, ISO18000, API, GB standards.
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 | DN | D | C | g | T | f | E |
L | W | H | H1 | H2 |
Z-MO |
ISO
5211 |
| 1/2″ | 15 | 95 | 65 | 45 | 10 | 2 | 9 | 42 | 120 | 77 | 48.5 | 9 | 4-M12 | F03/F04 |
| 3/4″ | 20 | 105 | 75 | 58 | 12 | 2 | 9 | 44 | 120 | 85 | 54 | 9 | 4-M12 | F03/F04 |
| 1″ | 25 | 115 | 85 | 68 | 15 | 2 | 11 | 50 | 137 | 94 | 60 | 11 | 4-M12 | F04/F05 |
| 1 1/4″ | 32 | 140 | 100 | 78 | 15 | 2 | 11 | 60 | 187 | 104 | 72 | 11 | 4-M16 | F04/F05 |
| 1 1/2″ | 40 | 150 | 110 | 88 | 16 | 3 | 14 | 65 | 187 | 114 | 77 | 14 | 4-M16 | F05/F07 |
| 2″ | 50 | 165 | 125 | 102 | 18 | 3 | 14 | 80 | 187 | 120 | 86 | 14 | 4-M16 | F05/F07 |
| 2 1/2″ | 65 | 185 | 145 | 122 | 18 | 3 | 17 | 110 | 315 | 160 | 108 | 17 | 4-M16 | F07/F10 |
| 3″ | 80 | 200 | 160 | 138 | 20 | 3 | 17 | 120 | 315 | 170 | 116 | 17 | 8-M16 | F07/F10 |
| 4″ | 100 | 220 | 180 | 158 | 20 | 3 | 19 | 140 | 315 | 182 | 138 | 17 | 8-M16 | F07/F10 |
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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