Backflow Preventers

Valves that prevent contaminated water from flowing back into the mains at the point where a fire system connects to the drinking-water network

EQUIPMENT

What Is a Backflow Preventer, and Where Is It Used?

In most projects, fixed fire suppression systems are fed from the city mains or a drinking-water line. At this connection point, stagnant water sitting in the system can flow back into the mains the moment pressure drops or a pump starts — water in fire piping is considered chemically different from mains water. A backflow preventer is a one-way, testable protection device that physically blocks flow in that direction.

The three models we supply in this group provide the same protection at different scales: the BABM for small-diameter (DN40–DN50) threaded lines, the BA4760 for larger-diameter (DN65–DN250) flanged mains, and the DAS city-main connection set, a connection station that packages the backflow preventer together with the alarm valve and supply configuration in a single unit.

These valves are used at the city-main or drinking-water inlet of a water-based suppression system.

Selection Criteria

Connection type: threaded (BABM) from DN40–DN50; flanged (BA4760) from DN65 upward. The line's nominal diameter and pipe material decide the connection type.
Protection class: our source catalogue lists these models under EN 1717 protection class 4; this is not a statement of a separate UL/FM/VdS approval body. If your project specification requires a separate approval body, confirm with us before selecting.
City-main connection set (DAS): preferred on projects where the pump station connects to the city main through a single package, matched to a wet or dry alarm type and a supply direction (right/left).
Service access: backflow preventers require periodic testing; leave enough clearance around the valve at the installation point for service.

Models We Supply

We supply the models below for your projects; for the full brand range see Viking fire protection products.

VIKING

BABM — Backflow preventer — threaded

Approvals: No approval listed — The source catalogue does not name a certifying body (UL/FM/VdS, etc.); the product carries an EN 1717 Class 4 backflow-protection rating (see Features).
Sizes: 1-1/2” (DN40) – 2” (DN50)
Connection: Threaded
Features: EN 1717 Class 4 backflow protection

Part numbers (2)

Size	Connection	Type	Part no.
1-1/2”/DN40	Dişli	BSP	1511140
2”/DN50	Dişli	BSP	149B70005

VIKING

BA4760 — Backflow preventer — flanged

Approvals: No approval listed — The source catalogue does not name a certifying body (UL/FM/VdS, etc.); the product carries an EN 1717 Class 4 backflow-protection rating (see Features).
Sizes: 3” (DN80) – 8” (DN200)
Connection: Flanged
Features: EN 1717 Class 4 backflow protection

Part numbers (6)

Size	Connection	Type	Part no.
2-1/2”/DN65	Flanşlı	PN16	149B3486
3”/DN80	Flanşlı	PN16	149B3097
4”/DN100	Flanşlı	PN16	149B3098
6”/DN150	Flanşlı	PN16	149B3400
8”/DN200	Flanşlı	PN10	149B3401
10”/DN250	Flanşlı	PN10	149B3402

VIKING

DAS — Municipal supply connection

Approvals: No approval listed — The source catalogue has no separate approvals or features block for this product; the page lists part numbers only by feed side and alarm type.
Sizes: 3” (DN80)
Connection: Flanged (PN16)

Part numbers (4)

Size	Connection	Type	Configuration	Part no.
3”/DN80	Flanşlı	PN16	Islak alarm için sağdan besleme	860711
3”/DN80	Flanşlı	PN16	Islak alarm için soldan besleme	857124
3”/DN80	Flanşlı	PN16	Kuru alarm için sağdan besleme	862422
3”/DN80	Flanşlı	PN16	Kuru alarm için soldan besleme	862434

Request a Quote for Your Project

Tell us the line diameter, connection type and your mains-connection scenario; we'll work out the right model together.

Request a Quote