Acts as an on/off valve to start or stop flow in a pipeline. It offers excellent sealing performance and is particularly well-suited for complex media such as slurries, high-viscosity fluids, and crystalline or prone-to-settling substances, with minimal risk of clogging.
When equipped with an electro-pneumatic positioner, the valve achieves approximately linear or equal-percentage flow characteristics for continuous modulation. It is ideal for applications where extreme precision is not a primary requirement.
The diaphragm completely isolates the process media from the actuator and the external environment. This prevents corrosive media from damaging the actuator and stops external contaminants from compromising the media, making it ideal for food, pharmaceutical, and high-purity water applications with strict hygiene standards.
The valve body lining and diaphragm can be manufactured from various corrosion- and abrasion-resistant materials (such as fluoropolymers and specialized elastomers) to withstand strong acids, alkalis, salt solutions, and abrasive slurries in harsh service conditions.
The valve can be configured as Air-to-Open (FC – Fail Close) or Air-to-Close (FO – Fail Open). In the event of air supply failure or power loss, it automatically returns to a safe position (fully open or fully closed) to ensure system safety.
| Advantage | Description |
| Packing-Free Seal | Eliminates the traditional stuffing box and gland packing, completely removing the risk of stem leakage. Ideal for toxic, flammable, highly corrosive, and hazardous media. |
| Smooth Flow Path | Features a streamlined, full-bore design with no dead legs or flow stagnation points. Easy to clean and compliant with CIP (Clean-in-Place) and SIP (Sterilization-in-Place) requirements. |
| Wide Media Compatibility | Capable of handling media containing solids, fibers, high-viscosity fluids, and slurries without clogging. |
| Simple Maintenance | The diaphragm is the only wearable component. It is quick and easy to replace, usually without removing the valve body from the pipeline, resulting in low maintenance costs. |
| High Safety | Powered by compressed air with no electrical sparks generated, making it inherently safe for explosive or hazardous environments. |
| Limitation | Description |
| Temperature Constraints | Limited by the thermal properties of the diaphragm material. Standard operating temperatures are ≤150°C (302°F), with special materials reaching up to 200°C (392°F). |
| Pressure Constraints | Standard nominal pressure is typically ≤1.6 MPa (PN16 / Class 150). High-pressure applications require specialized design. |
| Moderate Control Accuracy | Compared to dedicated control valves (e.g., globe valves), the linearity and precision of flow regulation are relatively lower. |
| Limited Diaphragm Lifespan | The diaphragm is a consumable part. Its service life is shortened under conditions of high cycle frequency, extreme temperatures, strong corrosion, or high differential pressure, requiring periodic replacement. |
| Name/Material | CI/DI | WCB | CF8 | CF8M | CF3M |
| Body | CI/DI | WCB | CF8 | CF8M | CF3M |
| Diaphragm | EPDM or EPDM+Fluoroplastic | ||||
| Lined | RUBBER / FEP / PFA / PO / PTFE | ||||
| Seat | RUBBER / FLUOROPLASTIC | ||||
| Bolt/Nut | B7/2H | B7/2H | B8/8 | B8M/8M | B8M/8M |
| Design & Manufacture Standard | GB/T12239 | API 6D | ||
| FTF Dimension Standard | GB/T12221 | ASME B16.10 | ||
| Flange standard | HG/T20592 | ASME B16.5, JIS B2220 | ||
| Inspection & Test Standard | HG/T13927 | API 598 | ||
| Normal Diameter | DN15~DN300 | 1/2”~12” | ||
| Normal Pressure | 1.0MPa | 1.6MPa | 150LB | |
| Test pressure | Shell Test | 1.5MPa | 1.5MPa | 1.5MPa |
| High Pressure Test | 1.1MPa | 1.1MPa | 1.1MPa | |
| Low Pressure Test | 0.6MPa | 0.6MPa | 0.6MPa | |
| Temperature Range | FEP:-29℃~120℃, PFA:-29℃~180℃, PTFE:-29℃~150℃, NR:-29℃~80℃, EPDM:-29℃~110℃, | |||
| Applicable Medium for fluoroplastic lined | Strong corrosion medium: Hydrochloric acid, Nitric acid, Hydrofluoric acid, Liquid chlorine, Sulfuric acid and Aqua regia etc. | |||
| Applicable Medium for rubber lined | Generally corrosion medium | |||
| DN | PNS | L | D | D1 | D2 | f | b | Z-Φd | Do | H |
| (mm) | (Inch) | PN1.0MPa/1.6MPa | ||||||||
| 15 | 1/2″ | 125 | 95 | 65 | 45 | 3 | 15 | 4-14 | 120 | 296 |
| 20 | 3/4″ | 135 | 105 | 75 | 55 | 3 | 17 | 4-14 | 120 | 296 |
| 25 | 1″ | 145 | 115 | 85 | 65 | 3 | 17 | 4-14 | 160 | 296 |
| 32 | 1-1/4″ | 160 | 140 | 100 | 75 | 3 | 19 | 4-18 | 160 | 398 |
| 40 | 1-1/2″ | 180 | 150 | 110 | 85 | 3 | 19 | 4-18 | 180 | 405 |
| 50 | 2″ | 210 | 165 | 125 | 100 | 3 | 21 | 4-18 | 200 | 464 |
| 65 | 2-1/2″ | 250 | 185 | 145 | 120 | 3 | 21 | 4-18 | 250 | 500 |
| 80 | 3″ | 300 | 200 | 160 | 135 | 3 | 21 | 8-18 | 280 | 645 |
| 100 | 4″ | 350 | 220 | 180 | 155 | 3 | 23 | 8-18 | 300 | 665 |
| 125 | 5″ | 400 | 250 | 210 | 185 | 4 | 24 | 8-18 | 320 | 832 |
| 150 | 6″ | 460 | 285 | 240 | 210 | 4 | 26 | 8-23 | 350 | 933 |
| 200 | 8″ | 570 | 340 | 295 | 265 | 4 | 26 | 8/12-22 | 450 | 1275 |
| 250 | 10″ | 680 | 395 | 350 | 320 | 4 | 28 | 12-22/26 | 500 | – |
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