Design and manufacturing:GB/T 12235, ASME B16.34, IEC 60534
The structural length: GB/T 12221, ASME B16.10
Connection forms:HG/T 20592-20605, GB/T 9112-9124, ASME B16.5
Inspection and test:GB/T 13927, API 598, IEC 60534-4
Caliber:1/2″ ~ 12″ (DN15 ~ DN300)
Pressure temporature level:ASME B16.34, GB/T 12224
Drive mode: Pneumatic Actuated
Pressure: PN6 ~ PN64
The Pneumatic Diaphragm Control Valve is an automated device, powered by air pressure, that modulates fluid flow within a system to maintain desired levels of flow, temperature, and pressure. The diaphragm’s position is finely adjusted by a pneumatic actuator, making it ideal for applications where accurate control is essential.
It is widely used to meet demanding requirements for high-quality process control.
| Project | Index Value | Project | Index Value |
|---|---|---|---|
| Basic Error (%) | Without locator: ±5.0 | Close air – Start: ±5.0 | End: ±2.5 |
| With locator: ±1.0 | With locator – Start: ±1.0 | End: ±1.0 | |
| Backlash (%) | Without locator: 3.0 | Open air – Start: ±2.5 | End: ±5.0 |
| With locator: 1.0 | With locator – Start: ±1.0 | End: ±1.0 | |
| Dead Area (%) | Without locator: 3.0 | Always point deviation (%): ±1.0 | |
| With locator: 0.4 | Rated stroke deviation (%): ±2.5 | ||
| Allowable leakage (l/h) | 1 × 10⁻⁴ × rated valve capacity | ||
Technical Parameters for Adjusting Mechanism
| DN (mm) | 20 | 25 | 32 | 40 | 50 | 65 | 80 | 100 | 150 | 200 |
|---|---|---|---|---|---|---|---|---|---|---|
| Seat Diameter (mm) | 10 | 12 | 15 | 20 | 25 | 32 | 40 | 50 | 125 | 150 |
| Rated Flow Coefficient (Kv) | ||||||||||
| – Linear | 1.8 | 2.8 | 4.4 | 6.9 | 11 | 16 | 27.5 | 44 | 470 | 690 |
| – Equal Percentage | 1.6 | 2.5 | 4.0 | 6.3 | 10 | 16 | 25 | 40 | 630 | 900 |
| Parameter | Value |
|---|---|
| Rated Pressure (MPa) | 0.6, 1.6, 4.0, 6.4 |
| Travel (mm) | 16 (for DN ≤ 40), 40 (DN 50–100), 60 (DN ≥ 150) |
| Flow Characteristics | Linear, Equal Percentage |
| Medium Temperature (°C) | –20 ~ 200°C (Normal) –40 ~ 250°C (Cast steel) –40 ~ 450°C (Stainless) |
| Connection Standard | Cast iron flange per JB/T78–94, Cast steel flange per JB/T79–94 |
| Body Material | HT200 (PN ≤ 1.6 MPa) WCB (ZG230–450), ZG1Cr18Ni9Ti, ZG0Cr18Ni12Mo2Ti (PN ≥ 4.0 MPa) |
| Plug Material | 1Cr18Ni9, 0Cr18Ni12Mo2Ti |
| Bonnet Type | Ordinary type (normal temp), Heat-piece type (medium temp) |
| Adjustable Range | 50:1 |
| Model | ZHA(B)–22 | ZHA(B)–23 | ZHA(B)–34 | ZHA(B)–45 |
|---|---|---|---|---|
| Effective Area (cm²) | 350 | 350 | 560 | 900 |
| Travel (mm) | 16 | 25 | 40 | 60 |
| Spring Range (KPa) | 20–100 (standard); Optional: 40–200, 80–240, 20–60, 60–100 | |||
Chemical Industry: Precisely regulates corrosive and hazardous fluids.
Water Treatment: Controls the flow in filtration and water supply systems.
Pharmaceutical Production: Ensures clean, accurate handling of fluids in manufacturing processes.
Food & Beverage: Manages ingredient flow, meeting strict sanitation requirements.
Oil & Gas: Controls hydrocarbons and fluids in refinery and pipeline systems.
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