Description
Buy Ball Valve Q641H PN1.6/2.5MPa WCB Flanged Pneumatic Operated
The Q641H Pneumatic Metal Seated Ball Valve from VALVEHU is engineered for demanding industrial applications requiring high durability, leak-tight performance, and automated control. This ball valve integrates a precision-machined ball with a robust pneumatic actuator to deliver reliable sealing under pressure classes PN1.6MPa and PN2.5MPa.
Constructed with a WCB carbon steel or CF8/CF8M stainless steel body, this product is available with multiple material options for the ball and stem including 2Cr13, 304, 316, and 316L, making it suitable for corrosive, high-temperature, and high-cycle environments. The V-type PTFE soft seal or metal sealing ring ensures enhanced shutoff performance depending on application needs, whether for steam, gas, or aggressive media.
Its flanged connection design allows easy integration into pipeline systems and ensures compatibility with international flange standards. The actuator operates within 0.4 to 0.7 MPa air supply and can be controlled via 4–20mA signal, supporting precise modulation or on/off function with high responsiveness.
With a compact profile and low torque requirements, this valve is widely used in petrochemical, metallurgy, power generation, textile, paper, and pharmaceutical industries. Its rugged structure and precise seat alignment guarantee minimal leakage and extended operational life even in cyclic operations.
If you’re looking for a dependable automated solution to control flow in your processing line, the Q641H series is a solid choice. For technical consultation and sourcing assistance, feel free to reach out to VALVEHU in China. Our valve specialists are ready to help you find the right valve for your system.
Technical Specifications
Valve Type: Pneumatic Metal Seated Ball Valve
Model: Q641H
Pressure Rating: PN1.6MPa / PN2.5MPa
Body Material: WCB / 304(CF8) / 316(CF8M) / 316L(CF3M)
Ball Material: 2Cr13 / 304 / 316 / 316L
Stem Material: 2Cr13 / 304 / 316 / 316L
Seal Type: V-shape PTFE or metal seal
Connection: Flanged
Actuation: Pneumatic double-acting or spring return
Control Signal: 4–20mA or air pressure 0.4–0.7 MPa
Main Valve Component Materials
| Component Name | WCB | 304 (CF8) | 316 (CF8M) | 316L (CF3M) |
|---|---|---|---|---|
| Valve Body | WCB | 304 (CF8) | 316 (CF8M) | 316L (CF3M) |
| Ball | 2Cr13 + Nitrided | 304 | 316 | 316L |
| Stem | 2Cr13 | 304 | 316 | 316L |
| Seat Ring | Stainless Steel + Hardened Treatment | Stainless Steel + Hardened Treatment | Stainless Steel + Hardened Treatment | Stainless Steel + Hardened Treatment |
| Sealing Material | V-type PTFE / Flexible Graphite | V-type PTFE / Flexible Graphite | V-type PTFE / Flexible Graphite | V-type PTFE / Flexible Graphite |
Main Overall and Connection Dimensions (Unit: mm)
| Nominal Diameter DN (mm) | L | H | H1 | A | PN1.6MPa D | D1 | D2 | n–Φd | PN2.5MPa D | D1 | D2 | n–Φd |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 15 | 130 | 185 | / | 140 | 95 | 65 | 46 | 4–14 | 95 | 65 | 46 | 4–14 |
| 20 | 140 | 191 | / | 140 | 105 | 75 | 45 | 4–14 | 105 | 75 | 56 | 4–14 |
| 25 | 150 | 193 | / | 140 | 115 | 85 | 65 | 4–14 | 115 | 85 | 65 | 4–14 |
| 32 | 165 | 212 | / | 164 | 140 | 100 | 76 | 4–18 | 140 | 100 | 76 | 4–18 |
| 40 | 180 | 217 | / | 164 | 150 | 110 | 84 | 4–18 | 150 | 110 | 84 | 4–18 |
| 50 | 200 | 260 | 102 | 190 | 165 | 125 | 99 | 4–18 | 165 | 125 | 99 | 4–18 |
| 65 | 220 | 293 | 114 | 210 | 185 | 145 | 118 | 4–18 | 185 | 145 | 118 | 4–18 |
| 80 | 250 | 323 | 127 | 247 | 200 | 160 | 132 | 8–18 | 200 | 160 | 132 | 8–18 |
| 100 | 280 | 382 | 152 | 276 | 220 | 180 | 156 | 8–18 | 235 | 190 | 156 | 8–22 |
| 125 | 320 | 468 | 184 | 348 | 250 | 210 | 184 | 8–18 | 270 | 220 | 184 | 8–26 |
| 150 | 360 | 510 | 219 | 378 | 285 | 240 | 211 | 8–22 | 300 | 250 | 211 | 8–26 |
| 200 | 400 | 655 | 273 | 524 | 340 | 295 | 266 | 12–22 | 360 | 310 | 274 | 12–26 |
| 250 | 630 | / | 360 | / | 405 | 355 | 319 | 12–26 | 425 | 370 | 330 | 12–30 |
| 300 | 750 | / | 395 | / | 460 | 410 | 370 | 12–26 | 485 | 430 | 389 | 16–30 |
FAQ
What is the difference between metal seat and PTFE soft seat?
Metal seats handle higher temperatures and abrasive media, while PTFE offers better sealing for clean fluids.
Is the Q641H ball valve suitable for steam applications?
Yes, with a metal seat and stainless steel components, it is ideal for steam and high-temperature service.
Can the valve be used in automated control systems?
Absolutely, it supports 4–20mA signal input and integrates easily into PLC-controlled systems.
What are the available materials for the valve body and ball?
Body options include WCB and CF8/CF8M; balls are available in 2Cr13, 304, 316, and 316L.
Does the valve support fail-safe operation?
Yes, optional spring-return actuators allow for fail-open or fail-close configurations.
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