HVAC Butterfly Valves: Wafer and Lug Type Unival HVAC Series for Heating, Cooling, Chilled Water and Condenser Water Piping
ValveAtlas supplies Unival HVAC series wafer butterfly valves (BWN-0201 DN100-DN300, BWN-0301 gear-box DN350-DN600) and lug butterfly valves (BLN-0201 DN50-DN300, BLN-0301 DN100-DN600 gear box, BLN-0401 double-eccentric DN100-DN600) with ductile iron body, EPDM or NBR seat, 316 stainless stem and lever, gear-box or double-eccentric operator for industrial heating-cooling, HVAC chilled water, condenser water and glycol loops.
HVAC butterfly valves are NOT UL or FM listed — they are industrial valves for non-fire-protection service. For UL/FM fire butterfly valves see UL/FM Fire Butterfly Valves.
Wafer vs Lug butterfly selection
Wafer (BWN series) installs between two flanges — requires both flanges to be bolted through the valve. Used for line service where downstream flange will not be removed for maintenance.
Lug (BLN series) has threaded bolt holes — downstream pipe can be removed while the valve remains isolated and holds pressure against the upstream flange. Used for dead-end service and end-of-line isolation.
Unival HVAC butterfly range
BWN-0201 wafer lever-operated 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 for bubble-tight shutoff DN100-DN600. Body ASTM A536 ductile iron, disc EPDM-encapsulated ductile iron or nickel-aluminum-bronze, seat EPDM (water) or NBR (oil), stem 316 stainless, PN10 / PN16 / ANSI Class 125 / Class 150 flange compatibility.
Typical HVAC applications
Chilled water primary loop isolation, chiller evaporator inlet/outlet, condenser water tower isolation, cooling tower sump drain, heating hot water main isolation, boiler inlet/outlet, variable primary flow (VPF) plant bypass, DHW mixing valve isolation, swimming pool filter bypass, glycol snowmelt loop isolation.
Related HVAC products
See also: Flanged valves (HVAC), Boiler room components, HVAC check valves, HVAC ball valves (flanged).
Contact ValveAtlas for HVAC butterfly valve quotation
Email BWN/BLN series quotation requests with size, operator type (lever/gear/double-eccentric), seat material (EPDM/NBR) and flange class to info@valve-atlas.com.