API · ASME · DIN · EN standard industrial valves
Three-Way Control Valves
Three-way control valves combine or divert two flows inside a single modulating body — converging for mixing two streams to a controlled outlet, diverging for splitting one stream — replacing a piping tee plus a two-way valve where actuator space, cost or installation symmetry matters. The range covers DN20 to DN400 at PN 16 to PN 100 / Class 150 to Class 600, with flanged, RF, MF and RTJ end connections, WCB/WC6/CF8/CF8M bodies, SS304/SS316/cobalt-chromium hardfacing alloy seating, linear, equal-percentage and quick-open flow characteristics, Cv values from 1.6 to 690, metal-seal leakage grade IV and soft-seal grade VI, and face-to-face lengths from 118 mm to 698 mm across the dimensioned DN15-DN300 range in two pressure series (PN1.6-4.0 and PN6.4). Selection turns on converging versus diverging duty, the pressure balance between ports, and the same trim/leakage choices as the two-way line.
Part of the Control Valves family
Last updated: 2026-11
Family specifications
| size range | DN20 to DN400 |
|---|---|
| pressure class | PN 16 to PN 100, Class 150 to Class 600 |
| flow characteristics | Linear, Percentage, Quick Open |
| rated cv | Percentage CV 1.6 to 630, linear CV 1.8 to 690 |
| leakage class | Class III, IV, V and VI per FCI-70.2; metal-to-metal seating Class IV below 0.01% of rated Cv; metal-to-soft seating Class VI bubble-tight |
| rangeability | 50:1 rangeability with linear characteristic |
| body materials | WCB, WC6, CF8, CF8M |
| end connections | Flanged, RF, MF, RTJ |
| operation | pneumatic diaphragm, piston, or electric actuators |
| face to face length | 118 mm to 698 mm across DN15-DN300 (PN1.6-4.0 series) |
| seat plug materials | SS304, SS316, cobalt-chromium hardfacing alloy |
| allowable leakage | Metal seal: grade IV (0.01% rated capacity); soft seal: grade VI (foam grade) |
| control accessories | pneumatic positioner, electro-pneumatic positioner, limit switch, solenoid valve, air lock relay, volume booster, filter regulator (AFR), position transmitter |
| mixing vs diverting selection | mixing-type valves can also serve diverting duty at small differentials; for sizes above 4 in with considerable pressure differential the mixing type is more suitable |
| flow functions | mixing (two inlets, one outlet), diverting (one inlet, two outlets), bypass |
| port configurations | mixing configuration has two inlets and one outlet combining two streams; diverting configuration has one inlet and two outlets splitting one stream |
| pn rating by size | DN 65-125: PN 25; DN 150-300: PN 16; DN 350-450: PN 10, each max 100 °C (optional 250 °C) |
| flange standards | DIN 2632 (PN 10), DIN 2633 (PN 16), EN 1092-2, ANSI Class 150, JIS B 2210 5K |
| stainless steel ratings | stainless steel bodies: PN25 for DN 65-125 mm, PN16 for DN 150-300 mm, PN10 for DN 350-450 mm |
| temperature control use | commonly applied where fluid temperature is adjusted through heat exchangers, e.g. heating and cooling circuits, marine diesel, calender presses |
| din size pressure temperature envelope | DN 15 to 500, PN 16 to 160, -196 to +550 °C |
| ansi size class alternative | an ANSI-version family of three-way control valves covers nominal sizes up to NPS 20 with pressure classes from Class 150 to Class 900 (documented in a separate ANSI data sheet) |
| operating temperature packing window | body without insulating section: -10 to +220 °C standard packing, up to +350 °C with high-temperature packing; metal bellows or metal seal versions extend to -196 to +550 °C |
| seat plug leakage class din | metal seat-plug seal leakage class 0.05 % of KVS per DIN EN 60534-4 |
| mixing diverting conversion | conversion between mixing and diverting service by reversing the seat-guided valve plug |
| sizing pressure drop coefficients | control valve sizing terms per DIN IEC 60534-2-1 and DIN IEC 60534-2-2: FL = 0.95, xT = 0.75 |
| din body material grades | cast steel 1.0619, cast steel 1.7357 (high-temperature), cast stainless steel 1.4408 |
| packaging options test connection | two spring-loaded PTFE V-ring packings or two adjustable high-temperature packings; a test connection between the two packings available on request |
| kvs coefficient envelope | available KVS coefficients span 4 (DN 15, 15 mm travel) up to 3600 (DN 500, 120 mm travel); KVS 1000 special version only for DN 250 as mixing valve |
| hvac small mixing envelope | HVAC three-way mixing valve line in sizes 1/2 to 2 inch, screwed NPT end connections, for hot or chilled water in heating and air conditioning systems |
| bronze body pressure rating hvac | screwed cast bronze bodies rated 250 psig per ANSI B16.15-1985 (do not apply the pressure rating to the piping system; up to 400 psig below 150 °F) |
| hvac control media temperature | allowable control media temperature 20 to 281 °F (-7 to 138 °C) |
| hvac water dp limit | maximum recommended differential pressure for water 35 psi (241 kPa) for normal service life; cavitation limitation applies beyond it and exceeding the limit voids the product warranty |
| hvac cv by size example | small-size Cv ratings 2.2, 4.4, 7.5, 14, 20, 28 to 41 with kvs ratings 1.9 to 35 across the 1/2 to 2 inch series; Cv = kvs x 1.156 |
| hvac port piping rule | three-way mixing bodies must be piped with two inlets (ports A and B) and one outlet (port AB) |
| thermal actuator md applications | self-actuated three-way duty: diverting return flow through a cooler or heat exchanger, or bypassing a reservoir loop for rapid system warm-up; mixing two inlet streams to a controlled outlet temperature in cooling-water, lube-oil and hydraulic-fluid cooling circuits |
| seat materials | SS304, SS316, cobalt-chromium hardfacing alloy |
| plug metal sealing | SS304, SS316, cobalt-chromium hardfacing alloy |
| plug soft sealing | SS304, SS316, cobalt-chromium hardfacing alloy |
| cage materials | SS304, SS316 |
| guide sleeve | SS304, SS316 |
| stem materials | SS304, SS316 |
| balanced piston | Steel, Aluminium |
| balanced piston ring | Fluorine Ring, SS+Reinforced PTFE, Flexible Graphite Ring |
Ordering & documentation
Documents
Ask for the documentation set with the inquiry — typical items (material certificates, test reports to the listed inspection standard, dimensional drawings) are confirmed and supplied with the quotation.
Quotation
Send the medium, temperature, pressure, size and connection for a quotation-ready inquiry. Lead time, MOQ and price are confirmed at quotation, together with the documents to be supplied with the order.
Sample & supply
Supply terms, order quantities and lead time are agreed per order — state the destination country and required schedule with the inquiry.
Storage & shipping
Store valves with seats and seals protected from UV, ozone and deformation, and keep end-face protectors on until installation; storage limits and shipping arrangements for the selected materials are confirmed at quotation.
Frequently asked questions
What sizes and pressure ratings are available for three-way control valves?
The published size range is DN20 to DN400, and the published pressure ratings are PN 16 to PN 100, Class 150 to Class 600. Availability of a specific size and rating is confirmed at quotation.
What materials are three-way control valves available in?
The published specification lists body materials: WCB, WC6, CF8, CF8M. Material availability for a specific size and rating is confirmed at quotation.
What end connections do three-way control valves support?
The published specification lists Flanged, RF, MF, RTJ as the available end connections. The connection for a specific size is confirmed at quotation.
What should a quotation inquiry for three-way control valves include?
The governing standard and class, nominal size, body and seat materials, the service medium with temperature, and the destination — anything missing is confirmed during quotation.
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