Waterflow Switches Boston | UL 346/FM 1049 Vane-Type Sprinkler Flow Switches | Valve-Atlas

Waterflow Switches Boston: 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 Boston. UL 346 listing with no TSE-only references. Full submittal package for Boston Fire Department (BFD) approval under 780 CMR Massachusetts State Building Code.

This is the technical reference for Boston fire alarm designers, sprinkler contractors and system integrators selecting waterflow detection for Logan Airport (BOS), Raytheon Waltham, Prudential Tower and MIT. 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 Boston 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 Boston 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 Boston Fire Department (BFD) approval.

Related Boston fire protection products

See also: Fire sprinklers Boston, Wet alarm valves Boston, Dry pipe valves Boston, Check valves Boston.

Contact ValveAtlas for Boston waterflow switches quotation

Email UVWF quotation requests and Potter/System Sensor/Viking substitution submittals for Boston Fire Department (BFD) approval to info@valve-atlas.com.