Waterflow Switches London: UL 346 Listed and FM 1049 Approved Vane-Type Sprinkler Waterflow Detectors for NFPA 13 Alarm Initiating Devices on Wet, Dry-Pipe, Pre-Action and Deluge Systems
ValveAtlas supplies UL 346 Listed and FM 1049 Approved vane-type waterflow switches (UVWF-100, UVWF-150, UVWF-200, UVWF-250, UVWF-300, UVWF-400 and UVWF-600) in sizes DN25 through DN150 (1″ through 6″) with paddle sensor, pneumatic retard, two sets of SPDT contacts and tamper-resistant enclosure to fire protection contractors and mechanical subs across London. UL 346 listing with no TSE-only references. Full submittal package for London Fire Brigade (LFB) approval under Approved Document B and BS 9990.
This is the technical reference for London fire alarm designers, sprinkler contractors and system integrators selecting waterflow detection for Heathrow (LHR), The Shard, Canary Wharf and Imperial College London. UVWF paddle mounts on tee saddle at main or floor control riser. Wet pipe SPDT alarm initiation with 0-90 second adjustable retard. Dry pipe, pre-action and deluge applications use pressure-type switches (see PS-10-1 series separately).
UNIVAL UVWF waterflow switch product range
UVWF-100 through UVWF-600 covers DN25, DN32, DN40, DN50, DN65, DN80, DN100, DN150 pipe sizes with matching paddle sensor for 1″ to 6″ sprinkler main. Each unit has two SPDT contacts (alarm + auxiliary), pneumatic retard timer adjustable 0-90 seconds for surge protection, and UL-listed weather-resistant steel enclosure with cover tamper switch option. NEMA 4X kit available for outdoor installation.
Why London contractors choose ValveAtlas waterflow switches
UL 346 and FM 1049 dual listing. UL 346 (Waterflow Indicators for Fire Protective Signaling Systems) and FM 1049 (Waterflow Detectors). Every UVWF carries both listings with no TSE-only parts.
Pneumatic retard 0-90 seconds adjustable. NFPA 13 8.17.2 recommended retard prevents surge-related false alarms. Field-adjustable from closed-cell diaphragm, no batteries required.
Two sets of SPDT contacts. Primary contact for alarm panel, secondary for local bell or building management system. 10A rating at 125VAC.
Competitor substitution for London projects
Potter VSR-S/VSR-F, System Sensor WFD, Viking VSR and Notifier VSR-F series all substitute one-for-one with UVWF at matching pipe size and contact configuration. Same UL 346 and FM 1049 listing. Factory submittal package for London Fire Brigade (LFB) approval.
Related London fire protection products
See also: Fire sprinklers London, Wet alarm valves London, Dry pipe valves London, Check valves London.
Contact ValveAtlas for London waterflow switches quotation
Email UVWF quotation requests and Potter/System Sensor/Viking substitution submittals for London Fire Brigade (LFB) approval to info@valve-atlas.com.