Description
1. Overview of Pneumatic Three-Way Control Valve
Pneumatic three-way control valves are designed for fluid flow regulation, either combining two fluids into one or dividing one fluid into two. Featuring a multi-spring pneumatic diaphragm actuator and a cylindrical thin-walled valve core, these valves ensure sensitive action and precise flow characteristics. Suitable for industrial automation, they handle signals of 0-10mA DC or 4-20mA DC from control systems for efficient regulation.
Key Applications:
- Chemical processing
- Petroleum refining
- Metallurgy and power stations
- Paper and textile industries
- Pharmaceutical manufacturing
2. Material Specifications
| Component | Material |
|---|---|
| Valve Body & Cover | HT200, ZG230-450, ZG1Cr18Ni9Ti |
| Valve Core, Seat & Stem | 1Cr18Ni9 |
| Seal Gasket | Rubber asbestos board, stainless steel spiral gasket |
| Packing | PTFE (Polytetrafluoroethylene) |
| Upper & Lower Diaphragm Covers | A3 steel plate |
| Diaphragm | 35CrMoA, A3 |
| Support & Top Plate | HT200 |
| Compression Spring | 60Si2Mn |
| Woven Film | 5806 adhesive with 480D nylon mesh fabric |
3. Technical Parameters
- Nominal Diameter: DN20-400
- Nominal Pressure: 0.6-6.4MPa
- Body Type: Straight-through single-seat cast ball valve
- Media Temperature:
- Standard: -40℃ to 230℃
- Finned type: 230℃ to 450℃
- Special order: -100℃ to 600℃
- Flow Coefficient (Kv):
- Mixing: 8.5-1260
- Diverting: 25-1260
- Connection Types: Flange, welded, threaded
- Applicable Media: Water, oils, gases
- Adjustable Ratio (R): 50:1
4. Actuator Technical Parameters
| Model | Effective Area (cm²) | Stroke (mm) | Spring Range (kPa) |
|---|---|---|---|
| VPA(B)-3 | 400 | 16.25 | 20-100 |
| VPA(B)-4 | 630 | 25 | 40-200 |
| VPA(B)-5 | 1000 | 40 | 20-60 |
| VPA(B)-6 | 1600 | 60 | 60-100, 80-240 |
