{"product_id":"drayton-28mm-motorised-2-port-zone-valve-snap-on-actuator","title":"Drayton 28mm Motorised 2 Port Zone Valve \u0026 Snap-On Actuator","description":"\u003cdiv class=\"product-section\"\u003e\n\u003cp\u003e\u003cstrong\u003eDrayton 28mm Motorised 2 Port Zone Valve \u0026amp; Snap-On Actuator (6 Wire SPDT Switch) – MPN: 27205\u003c\/strong\u003e is a robust motorised zone valve designed for controlling individual heating or hot water zones on sealed or open‑vented systems. It combines a 28mm compression brass valve body with a snap‑on 230V actuator, providing reliable on\/off control with 100% tight shut‑off and simple industry‑standard wiring.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e2-port normally-closed zone valve\u003c\/strong\u003e – valve is normally closed and opens when powered, ideal for S‑Plan zoning of heating and hot water circuits.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e28mm compression connections\u003c\/strong\u003e – larger bore for higher flow rates and reduced pressure drop on bigger primary circuits.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSnap-on actuator\u003c\/strong\u003e – actuator clips on and off the valve body at the push of a side release button, allowing replacement without draining the system.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e6-wire SPDT auxiliary switch\u003c\/strong\u003e – built-in changeover end switch (SPDT) with 6-core cable for flexible interlocking of boilers, pumps and other controls.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpring-return mechanism\u003c\/strong\u003e – power‑to‑open with spring return to closed when power is removed, providing fail‑safe shut‑off.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e100% tight shut-off\u003c\/strong\u003e – designed for positive closure to prevent unwanted circulation and overshoot.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManual lever and position indicator\u003c\/strong\u003e – lever for manual opening during filling or override, plus visual indication of valve position.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplaceable actuator and motor\u003c\/strong\u003e – both motor and complete actuator can be replaced, extending system life and reducing downtime.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eTechnical Highlights\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand \/ Range:\u003c\/strong\u003e Drayton – Motorised Valves.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel \/ Part:\u003c\/strong\u003e ZA6\/779-2 28mm 2-port zone valve with actuator (Part No. 27205).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eValve type:\u003c\/strong\u003e 2-port, normally closed zone valve.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnections:\u003c\/strong\u003e 28mm compression (copper tube).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBody material:\u003c\/strong\u003e brass forging.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMotor voltage:\u003c\/strong\u003e 230V AC, ≈5W synchronous motor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperation:\u003c\/strong\u003e energise to open, spring return to close.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMax static pressure:\u003c\/strong\u003e 8.6 bar.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMax differential pressure:\u003c\/strong\u003e approx. 0.5–0.7 bar (28mm zone valve).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlow characteristic (Kv):\u003c\/strong\u003e approx. 6.7–7.0 for 28mm valve (high flow for larger systems).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWater temperature range:\u003c\/strong\u003e 2°C to 93°C.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMax ambient temperature:\u003c\/strong\u003e 52°C.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCable:\u003c\/strong\u003e approx. 1m, 6-core (5 cores + earth) for SPDT end switch and motor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSwitch rating:\u003c\/strong\u003e 24–230V AC, 3(1)A resistive.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApproximate dimensions:\u003c\/strong\u003e height ~117mm, width ~124mm, depth ~70mm; valve body length ~105mm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards \/ certifications:\u003c\/strong\u003e conforms to EN 60730‑1 and related control standards.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eTypical Applications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eTwo‑port S‑Plan systems controlling separate central heating and hot water zones using 28mm primary pipework.\u003c\/li\u003e\n\u003cli\u003eZoned heating systems in larger domestic properties or small commercial installations where high flow rates are required.\u003c\/li\u003e\n\u003cli\u003eReplacement for existing 28mm Drayton or similar 2‑port valves using industry‑standard wiring centres and control schemes.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eInstall the brass valve body in the correct flow direction (typically in through Port A, out through Port B) and ensure pipe ends are clean and deburred before tightening compression joints.\u003c\/li\u003e\n\u003cli\u003eFit the actuator after pressure testing where possible; the snap‑on design allows actuator replacement without draining the system, but always isolate mains power first.\u003c\/li\u003e\n\u003cli\u003eWire using the standard 6‑wire SPDT zone valve diagram in the wiring centre, ensuring correct connections to thermostats, programmer and boiler.\u003c\/li\u003e\n\u003cli\u003eMount the valve where it is accessible for future servicing and where the position indicator and manual lever can be easily viewed and operated.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Drayton Controls","offers":[{"title":"Default Title","offer_id":62858052239709,"sku":"27205","price":123.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/Drayton28mmMotorised2PortZoneValve_Snap-OnActuator_6WireSPDTSwitch.jpg?v=1765526297","url":"https:\/\/qualityheating.co.uk\/products\/drayton-28mm-motorised-2-port-zone-valve-snap-on-actuator","provider":"AIZO Quality Heating","version":"1.0","type":"link"}