TRIVENT
Three-way valve 200 / 220 / 230

TRIVENT is available in three series: Series 200 (DN 25–600 / 1“ – 24“, PN 10–40 / Class 150–300), Series 220 (DN 25–300 / 1“ – 12“, PN 63–160 / Class 600–900) and Series 230 (DN 25–200 / 1“ – 8“, PN 250 / Class 1500). This covers the full spectrum from low-pressure heating circuits to high-pressure applications. The temperature range extends from –196 °C to +530 °C.

A three-way valve offers two key advantages over two separate valves: first, only one actuator and one positioner are needed – saving installation space, energy and capital cost. Second, the control characteristics of both ports are mechanically coupled in an inverse relationship, ensuring repeatable and accurate splitting or mixing behaviour with simplified operation and increased process safety. Where the two lines have very different requirements, two individual valves could still be the better choice.

Main applications are heating and cooling circuits across almost all industries: cooling-water or heat transfer oil control on heat exchangers, marine engine HT-cooling circuits, calender presses in the paper industry, cooling-water control on wire mills in the steel industry, bypass functions on heat exchangers, mixing duties in HVAC, and temperature-dependent flow control in chemical plants.

Wire mills require extremely short stroking times because cooling-water flow must respond within seconds to changes in rolling speed or to product changeovers. The TRIVENT three-way valve is engineered exactly for this: fast stroking, robust trim and the option to divert cooling water without risk of water hammer (instead of throttling it) provide extremely responsive, process-stable control.

In mixing mode, two inlet streams act on two central plug-seat pairs from different sides (bottom and side entry). The common stem moves both plugs synchronously, so that opening one seat closes the other proportionally. Both streams meet in the mixing chamber and leave the valve as a single mixed outlet stream (side outlet) with a defined mixing ratio and (if applicable) resulting temperature.

In diverting mode the valve is operated in the reverse flow direction: the inlet stream enters centrally (side entry) and is split into two outlet branches (opposite side and bottom outlet). Here too the common stem stroke produces an inverse split. The geometry of the two plugs determines the split ratio. The same valve can be supplied either as a mixer or a diverter, depending on the order specification.

Bodies are supplied – depending on the duty – in cast steel (1.0619 / A216 WCB), stainless steel (1.4408 / A351 CF8M), low-temperature cast steel (1.6220 / A352 LCC) or creep-resistant steel (1.7357 / A217 WC6, 1.7379 / A217 WC9). Trim materials and geometries are tailored to the relevant flow and wear conditions.

Because the two plug-seat pairs are mechanically coupled, the same ARCA actuators as for inline globe valves can be used: pneumatic multi-spring actuators (Series 812), single-spring actuators (811), piston actuators (812 DWK, 814) as well as electric and electro-hydraulic actuators. For extremely fast stroking (e.g. wire mills), high-speed pneumatic actuators with boosters and fast positioners – or, for change-over duties, with high-capacity, direct-acting solenoid valves – are recommended.

TRIVENT is supplied as standard with flanged connections to DIN EN 1092-1 or ASME B16.5 (RF and RTJ). Project-specific special connections are available as options. The valve therefore installs into the relevant piping environment without adaptation.

TRIVENT holds a DNV Marine Type Approval (certificate TAP00002TU) and is mainly used in marine engine HT-cooling circuits, fuel-mixing systems for different fuels (HFO/MGO change-over) and engine-room auxiliaries. The robust design reliably copes with the mechanical loads and vibration of shipboard operation.

For demanding mixing/diverting duty, the digital ARCAPRO® positioner is recommended; it provides diagnostic data via HART, PROFIBUS PA or FOUNDATION Fieldbus. Stroke, thrust and valve signature can be continuously monitored. For high-speed applications, booster configurations are available.

TRIVENT is designed in accordance with the Pressure Equipment Directive 2014/68/EU; the body is engineered to EN 12516-2 / ASME B16.34. Optional designs to AD 2000 and NACE MR0175 as well as a DNV Marine Type Approval (TAP00002TU) are available. ATEX compliance is covered by a manufacturer’s declaration to DIN EN ISO 80079-36. The full ARCA service portfolio (ARCAlaunch, ARCAcare, ARCAsafe, ARCA24/7) is in place; sizing is performed with ARCA-VENA, all documents are available via QR code through ARCAonsite.