Dry Pipe Valves: UL and FM Listed UVD-2511-300 Supply
ValveAtlas supplies UL Listed and FM Approved UVD-2511-300 dry pipe valves for sprinkler systems in unheated buildings, parking garages, loading docks, freezer warehouses and attics on projects in Toronto, Montreal, New York, Boston and London. The UVD-2511-300 is the differential-action dry pipe valve with integrated accelerator provision, priming chamber, low-air alarm connection and drain manifold.
This page is the technical reference for specifying engineers, construction firms, EPC project firms and mechanical subcontractors selecting dry pipe valves on fire protection systems governed by NFPA 13, NFPA 25 and BS EN 12845.
Dry pipe valve range at ValveAtlas
| SKU | Type | Pressure class | Trim | Listings | Sizes |
|---|---|---|---|---|---|
| UVD-2511-300 | Differential dry pipe valve with accelerator provision | 300 psi CWP water; 80 psi air supervisory | Complete factory trim: priming chamber, low-air alarm line, drain manifold, pressure gauges, water motor gong connection | UL and FM | 3″ to 8″ |
How a dry pipe valve works
The UVD-2511-300 uses a differential-area clapper: the system-side air pressure (typically 40 psi) acts on a larger area than the water-side supply pressure (typically 100 to 175 psi), holding the clapper closed despite the pressure imbalance. When a sprinkler opens, system air bleeds to atmosphere, the differential collapses, the clapper trips, and water flows through the valve into the dry piping.
NFPA 13 sets a maximum trip time of 60 seconds on systems up to 750 gallons and 90 seconds on systems up to 1500 gallons. UVD-2511-300 accelerator provision meets this requirement on large-capacity dry systems. Factory trim on UVD-2511-300 includes: differential clapper, priming chamber with priming water connection, supply-side pressure gauge, system-side pressure gauge, 2″ main drain, low-air supervisory pressure switch connection at 10 psi below system setpoint, quick-opening device (accelerator or exhauster) connection, water motor gong alarm line with pressure switch port.
Listings and code acceptance
UL 260. UVD-2511-300 carries UL 260 (dry pipe valves for fire protection service) listing. The UL certificate is issued to the manufacturer and is provided in the ValveAtlas submittal package.
UL listing for Canadian projects. UL listing covers the same SKU under ANSI/CAN/UL 260. Quebec RBQ, Ontario OBC and Canadian NFPA 13 projects accept the UL certificate.
FM Approval. FM Approvals Class 1020 certifies UVD-2511-300 for FM-insured properties under FM Global Data Sheet 2-0. Insurance surveyors at FM Global and other property insurers accept the FM certificate.
LPCB and UK acceptance. UK projects under BS EN 12845 accept UL/FM listing. Confirm with the insurance surveyor on LPCB-specific specifications.
Where dry pipe valves are used
Unheated parking garages. Cold-climate above-grade and below-grade parking structures in Toronto, Montreal and Boston where the sprinkler piping cannot be kept above 40 degrees Fahrenheit. UVD-2511-300 at the base of each garage zone with supervisory air from a dedicated shop-air compressor or nitrogen generator.
Unheated loading docks. Warehouse loading docks exposed to ambient cold. Dry pipe protection prevents freeze damage to sprinkler piping.
Freezer warehouses. Sub-zero freezer rooms require dry pipe with nitrogen gas instead of compressed air to eliminate corrosion-accelerating moisture.
Unheated attics. NFPA 13 and NFPA 13R require dry pipe or listed anti-freeze loop protection for attic sprinkler installation where ambient temperatures fall below freezing.
Outdoor canopy and loading dock protection. Exterior canopy sprinklers protecting loading areas, fuel islands and truck unloading positions.
Approved-equal submittals
Where a specification names a specific manufacturer, we prepare an approved-equal submittal package (listing certificates, dimensional drawings and material data) for review by the engineer of record and the authority having jurisdiction.
Regional stock and delivery for dry pipe valves
Toronto. UVD-2511-300 3″ through 8″ in stock at Toronto HQ with complete factory trim. Cold-climate Ontario market drives year-round demand for dry pipe on unheated parking, loading docks and warehouse storage.
Montreal. Next-day truck freight from Toronto. Quebec cold-climate market requires dry pipe on residential high-rise parking and logistics warehouses. French-language submittals supplied for RBQ filings.
New York. 2-day truck freight from Toronto. NYC DOB and FDNY accept UL certificate. High-rise residential parking garages and commercial loading docks are typical dry pipe applications.
Boston. 2-day truck freight from Toronto. BFD acceptance under UL listing and 780 CMR. New England cold-climate dry pipe market.
London UK. UK partner warehouse stocks 4″ and 6″ UVD-2511-300 for 48-hour delivery to central London. Unheated parking garage and basement car park protection under Approved Document B.
Related products for complete dry pipe system
Quick opening devices. Accelerators and exhausters to meet the NFPA 13 60-second trip requirement on large dry systems. Listed components coordinated with UVD-2511-300.
Gate and butterfly valves. UV0199 OS&Y gate flanged for riser isolation upstream of the dry pipe valve; UVB-G310 grooved butterfly for zone-level shutoff. See Butterfly Valves.
Grooved couplings. UV11 rigid 300 psi CWP and UV14 flexible 300 psi CWP on the riser connections. See Coupling Fittings.
Dry pendent sprinklers. UV822 dry pendent sprinkler for installation where branch piping runs through heated space but the sprinkler protrudes into cold space (e.g., heated ceiling with cold attic above). See Fire Sprinklers.
Auxiliary drain stations. Low-point drum drip trap on trapped low points throughout the dry piping per NFPA 13. See Test and Drain Valves.
Frequently asked questions
What air pressure does the dry pipe valve require? Typical system air pressure is 40 psi minimum to maintain the differential against 100 to 175 psi water supply pressure. Set supervisory air between 40 and 50 psi with a 20 psi low-pressure alarm. The UVD-2511-300 manual provides exact differential ratio and minimum air pressure for each water supply pressure range.
Can nitrogen replace compressed air? Yes. Freezer warehouse and corrosion-sensitive environments use nitrogen instead of compressed air to prevent moisture-driven internal corrosion of the dry piping. Listed nitrogen generators deliver 98 percent pure nitrogen at 40 to 50 psi system setpoint.
How often is the dry pipe valve trip tested? NFPA 25 requires annual trip test with full flow (without water) and triennial trip test with full flow (with water). Full flow trip with water validates the 60-second trip time and water delivery to the inspector’s test connection.
Does UVD-2511-300 need a priming water system? Yes. The priming chamber above the clapper holds a small volume of priming water to form the water seal against the air pressure. Priming water connection is part of the factory trim. Priming water is refilled from the supply-side pressure tap after each trip.
What is the difference between dry pipe and pre-action? Dry pipe system uses supervisory air to hold the clapper closed and trips on sprinkler operation. Pre-action uses supervisory air plus a detection system (typically smoke or heat) that must both signal before the preaction valve trips, preventing accidental waterflow from sprinkler damage (used in data centres and museums).
Contact ValveAtlas for a dry pipe valve quotation
For dry pipe valve quotations or approved-equal submittal packages on Toronto, Montreal, New York, Boston or London projects, email the project specification and drawings to info@valve-atlas.com or use the contact form on our website. Standard turnaround is 48 hours from receipt of the project specification.
For more fire protection products, see Fire Protection Products.