Three-Way Mixing / Diverting Control Valve
Mixing or Diverting · DN25–DN300 · PN16/PN40 · Replaceable Trim
Reguvale's three-way mixing / diverting control valve combines two inlet streams into one outlet (mixing) or splits one inlet into two outlets (diverting) using a single, field-reversible plug. It replaces two separate two-way valves plus a bypass, simplifying piping and reducing leak paths in temperature-blending, header-splitting and bypass loops.
The body is a true three-port globe with replaceable seat rings and a linear or equal-percentage plug. Plug rotation by 180° converts the same body between mixing and diverting duty, allowing a single SKU to cover both layouts. Pneumatic diaphragm or electric-motor actuators are both available.
Standard sizes DN25–DN300 in PN16 / PN40 cover most HVAC blending, district-heating bypass and chemical-mix loops. Stainless or alloy options are available on request.
Key Features
Mixing or Diverting
The same body converts between mixing (2-in / 1-out) and diverting (1-in / 2-out) by rotating the plug 180° in the field - one SKU covers both layouts.
Replaces Two Valves
A single three-way valve replaces two two-way valves plus bypass piping, saving cost, space and leak paths.
Replaceable Trim
Plug, seat rings and stem packing can be replaced without removing the body from the line.
Linear or Equal %
Linear characteristic suits constant-pressure drop loops (e.g. bypass); equal-percentage suits varying pressure drop (e.g. temperature blending).
Pneumatic or Electric
Compatible with the full range of Reguvale diaphragm and electric actuators.
True Three-Port Body
Three flanged ports in a single casting - no internal bypass leakage, no external piping mistake.
Technical Specifications
| Parameter | Specification |
|---|---|
| Body Material | WCB Carbon Steel / SS304 / SS316 / Ductile Iron GGG50 |
| Plug / Trim | SS304 / SS316 / 17-4PH |
| Seat Material | SS316 / PTFE / EPDM / NBR |
| Body Type | Three-port globe, mixing/diverting |
| Size Range | DN25 – DN300 (1" – 12") |
| Pressure Rating | PN16 / PN40 (ANSI 150 / 300 on request) |
| End Connection | Flanged (ISO 7005-2 / ASME B16.5) |
| Flow Characteristic | Linear / Equal-Percentage (reversible plug) |
| Actuator Type | Pneumatic diaphragm / Electric motor |
| Control Signal | 3-15 psi / 4-20 mA / On-Off |
| Positioner | YT-1000 / YT-1050 / Smart digital |
| Temperature | -40→+425°C depending on seat material |
| Leakage Class | ANSI Class IV (metal) / Class VI (soft) |
| Standards | IEC 60534 / GB/T 4213 / ANSI/ISA-75 |
| Certification | ISO 9001:2015, SGS MTC available |
Frequently Asked Questions
Mixing or diverting - what is the difference?
Mixing: two inlet streams blend into one outlet (e.g. hot/cold water blending).
Diverting: one inlet splits into two outlets (e.g. routing flow between two reactors). The same three-way body serves both duties with the plug rotated.
Can I use a three-way valve to replace two two-way valves?
Yes - a three-way valve replaces two two-ways plus bypass piping, reducing cost, space and leak paths in temperature-blending or header-splitting loops.
Which characteristic curve should I choose?
Linear for constant pressure drop (e.g. bypass).
Equal-percentage for varying pressure drop (e.g. blending).
Applications & Use Cases
HVAC Temperature Blending
Hot/cold water blending for air-handling units and fan-coil loops.
District Heating Bypass
Primary / secondary bypass and pressure-equalising loops in substations.
Chemical Mixing
Two-component reagent blending in water-treatment and process plants.
Reactor Flow Routing
Diverting feed between parallel reactors or product between storage tanks.
