Product Overview
The pneumatic diaphragm three‑way control valve is widely used for mixing or diverting fluid in heating, cooling and process systems. Powered by compressed air, it realizes precise flow regulation of liquid, gas and steam. With three‑way structure for medium mixing or splitting, it is ideal for temperature control in heat exchangers, central air‑conditioning and chemical processing. Matched with positioner, it achieves accurate modulation to stabilize system working conditions.
Core Features
Diaphragm Actuator
Flexible diaphragm drive, fast response, stable output thrust, low failure rate, suitable for continuous modulating control.
01
Two‑Function Three‑Way Structure
Available for mixing (two‑in‑one‑out) or diverting (one‑in‑two‑out), simplify pipeline layout and reduce extra valves.
02
High‑precision Flow Regulation
Match with pneumatic positioner; adjustable flow characteristic: linear / equal percentage. Good for closed‑loop automatic control.
03
Reliable Sealing Performance
Multiple material options for inner trim, good sealing performance, adapt to different temperature & medium conditions.
04
Typical Applications
Heat exchanger temperature control, central air‑conditioning HVAC system, petrochemical industry, power plant, water treatment, pharmaceutical processing, food processing.
Technical Specifications
| Actuator type | Pneumatic diaphragm | Flow characteristic | Linear / Equal percentage |
| Valve type | 3‑way mixing valve / diverting valve | Medium | water, steam, gas, weak corrosive fluid |
| Nominal diameter | DN15 ~ DN300 | Working temperature | ‑20℃ ~ +450℃ |
| Pressure rating | PN16, PN25, PN40; Class150‑Class300 | Signal input | 20‑100kPa standard air signal |
| Body material | WCB, CF8(304), CF8M(316) | Connection | Flange connection (GB, HG, ANSI) |
| Trim material | 304 / 316 / Stellite hard alloy | Accessories | positioner, filter regulator, handwheel, limit switch optional |
Packing & Delivery
Plywood case packing to prevent damage in transit. Support custom configuration. Accept FOB,CIF,DDP trade terms.
FAQ
Q: What is the difference between 3‑way mixing valve and diverting valve?
A: Mixing valve: two inlets, one outlet for mixing two medium streams. Diverting valve: one inlet, two outlets for splitting flow. Please confirm working condition before ordering.
Q: Does this valve come with positioner as standard?
A: Positioner is not standard supplied. It is optional accessory. Please specify if you need positioner, filter regulator or handwheel.
Q: What medium can this pneumatic 3‑way control valve handle?
A: Suitable for water, steam, air and weak corrosive media. For strong corrosive or high‑abrasion medium, we need to customize trim and body material.
Q: What air supply signal does diaphragm actuator use?
A:Standard pneumatic signal is 20‑100 kPa. If you need special signal range, inform us in advance.
Q: What information should I provide for quotation?
A: Please offer: DN size, pressure class, mixing or diverting, medium & temperature, fail‑safe mode, accessories requirement, flange standard.
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