HVAC Butterfly Valves London: Wafer and Lug Type BWN/BLN Series for Chilled Water, Condenser Water, Heating Hot Water, Cooling Tower and Glycol Loop Isolation in London Mechanical Rooms
ValveAtlas supplies HVAC butterfly valves (BWN-0201 wafer, BWN-0301 wafer gear-box, BLN-0201 lug, BLN-0301 lug gear-box, BLN-0401 lug double-eccentric) DN50 through DN600 with ductile iron body, EPDM or NBR seat, 316 stainless stem and PN10/PN16/ANSI Class 125 flange compatibility to mechanical contractors and HVAC subs across London. These are industrial HVAC valves, not UL/FM fire listed — for fire service see UL/FM Fire Butterfly Valves.
Reference for London mechanical designers working on airport terminals, high-rise towers, financial-district office buildings and university campuses, selecting butterfly valves for chiller evaporator/condenser isolation, cooling tower loop, heating hot water main, boiler inlet/outlet, VPF plant bypass, DHW mixing valve and pool/snowmelt glycol circuits.
HVAC butterfly product range
BWN-0201 wafer lever DN100-DN300, BWN-0301 wafer gear-box DN350-DN600, BLN-0201 lug lever DN50-DN300, BLN-0301 lug gear-box DN100-DN600, BLN-0401 lug double-eccentric bubble-tight DN100-DN600. ASTM A536 ductile iron body, EPDM-encapsulated disc, 316 SS stem. PN16 / ANSI Class 125 / Class 150 flange match.
Why London mechanical contractors choose ValveAtlas HVAC butterfly
Wafer vs Lug selection expertise. Wafer (BWN) between flanges for in-line service; Lug (BLN) with threaded bolt holes for dead-end and maintainable service.
EPDM (water) or NBR (oil) seat material. Spec seat to fluid — EPDM for glycol and chilled water, NBR for hydraulic and compressor oil.
Double-eccentric for bubble-tight. BLN-0401 has offset pivot for zero-leakage class A shutoff on steam and high-pressure water mains.
Approved-equal submittals
Where a specification names a specific manufacturer, we prepare an approved-equal submittal package (dimensional drawings and material data) for review by the engineer of record and the authority having jurisdiction.
Related London HVAC products
See also: HVAC flanged valves, Boiler room components, HVAC check valves London, HVAC ball valves London.
Contact ValveAtlas for London HVAC butterfly quotation
Email BWN/BLN quotation requests with size, operator (lever/gear/double-eccentric), seat material and flange class to info@valve-atlas.com.
Why ValveAtlas serves London UK
ValveAtlas supplies London fire protection contractors with equipment and documentation for projects under Approved Document B and the relevant BS EN standards. Where LPCB-approved components are specified, confirm acceptance with the insurer before ordering. UK lead time is 7–10 business days from our Toronto warehouse via sea freight; expedited air freight is available.