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Brand: Viking
Viking Model VNR Wide-Range Foam Proportioner, 6 in and 8 in
Description
A wide-range proportioner for foam-water sprinkler risers
The Viking Model VNR wide-range proportioner proportions foam concentrate into a water stream accurately over a wide range of system flow rates. It is configured for a 3 percent ratio. Viking points out that it can proportion correctly at the low flows seen when only a few sprinklers have operated. The designer must still make sure the system flow demand stays within the proportioner range.
It is one part of an approved foam system whose other main components are the foam concentrate, a storage tank, a concentrate control valve and the foam discharge devices. Please refer to the specific system manual for the full design.
Technical specifications
| Parameter | Specification |
|---|---|
| Manufacturer / model | Viking, Model VNR wide-range proportioner |
| Sizes | 6 in (DN150) and 8 in (DN200), wafer connection between ANSI and PN16 flanges |
| Foam inlet | Grooved, 2.5 in (76.1 mm or 73.0 mm outside diameter) |
| Proportioning rate | 3 percent with listed and approved concentrates |
| Design / test pressure | 250 psi (17.2 bar) / 500 psi (34.4 bar) |
| Operating inlet pressure | 30 psi (2.1 bar) minimum to 175 psi (12.1 bar) maximum |
| Design temperature range | 14 °F to 120 °F (-10 °C to 49 °C) |
| Operating temperature range | 35 °F to 120 °F (1.7 °C to 49 °C) per FM 5130 |
| Approximate weight | 47 lb (21 kg) for 6 in; 71 lb (32 kg) for 8 in |
| Dimensions A x B x C | 6 in: 9-1/4 x 13 x 2-3/4 in; 8 in: 10-7/8 x 16-1/2 x 3-1/4 in |
| Materials | Brass EN CB491K body, neck and grooved inlet; stainless steel rod, clapper and collar; UNS C95800 orifice plate; stainless steel AISI-302 spring |
| Printed approval | FM Approved low expansion foam systems (FM5130) as part of a system |
Installation can be horizontal or vertical, with a flow direction indicator on the body, and the unit is for fresh or salt water.
Sizing the proportioner
Viking asks the designer to know the minimum and maximum flow demand of the system. The minimum flow should be above the minimum shown in the data sheet ordering table, and the maximum should be below the table maximum. If both sizes suit, the choice can be based on the riser or supply pipe size. After selecting a size, check the flow graph in section 6.2 of the data sheet to confirm the required flows are possible at the available pressure; otherwise move up one pipe size.
The April 2026 revision updated the maximum flow rates, so always work from the current form.
The data sheet identifies the grooved foam inlet, orifice restrictor, orifice plate, spring, rod, threaded collar, clapper and plug as the main components. The foam inlet is grooved, so a suitable grooved coupling and pipe outside diameter of 76.1 mm or 73.0 mm must be matched when specifying the connection. The unit carries an identification tag plate, and the data sheet gives approximate weights and dimensions so the riser room layout can be checked early in design.
Related Viking foam product
| Model | Description |
|---|---|
| Model VNR wide-range proportioner | This page: wafer, 3 percent, 6 and 8 in |
| Model VLF ILBP proportioner | In-line balanced pressure, 3 to 8 in, brass or nickel aluminium bronze |
More fire protection items are in our Fire Fighting equipment range.
Confirm before ordering
Confirm foam concentrate and its 3 percent rating, riser size, minimum and maximum flow, inlet pressure and approval needs, noting that FM approval applies to the full combination of concentrate, tank and discharge devices. The attached Viking technical data contains the ordering table and flow graphs. Send the system data for a quotation.
Related Viking products: Viking Model VLF In-Line Balanced Pressure Foam Proportioner, Viking Model J-1 Alarm Check Valve, 3 in to 8 in, 300 psi, Viking Model VXR Dry Pipe Valve, 2-1/2 in to 6 in, 250 psi, Viking Model F-1 Dry Pipe Valve, 3 in to 6 in, 175 psi, Viking Model EA-1 Electronic Accelerator for Dry Systems and Viking VK503 K16.8 ESFR Pendent Sprinkler for Rack Storage.
Datasheets & Documents
- Datasheet Viking Model VNR wide-range proportioner technical data, Form F_102621 Rev 06 Download
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About brand
Viking is an American manufacturer of fire sprinklers, valves and special hazard fire protection systems, based in Michigan. The business grew from the work of Emil Tyden, a Swedish immigrant who made railroad car seals in Hastings, Michigan, and turned to sprinklers after buying the struggling Viking Corporation. By the late 1980s Viking had left contracting and design work to concentrate on manufacturing and distribution.
Seven Star LLC is an independent supplier in Muscat. We list selected Viking sprinklers, valves and foam equipment with the manufacturer technical data, for fire protection contractors in Oman and the GCC.
Viking company profile
| Origin | Hastings, Michigan, USA, where Emil Tyden began making sprinklers and valves |
|---|---|
| Headquarters | Michigan, USA (Viking Group) |
| Business model | Manufacturing and distribution through independent sprinkler contractors |
| Special hazards | Includes the Minimax Fire Products range, sold under the Viking name |
| Product families | ESFR pendent sprinklers such as VK500, VK503, VK506 and VK510 for storage protection, standard and quick-response sprinklers, deluge and preaction valves, dry pipe and alarm check valves, foam and special hazard systems |
Milestones
- 1880s: Emil Tyden starts out making railroad car seals.
- Early years: Tyden buys Viking Corporation and starts making sprinklers and valves in Hastings.
- Late 1980s: Viking leaves contracting to focus on manufacturing and distribution.
Viking product series
Sprinklers on this site are ESFR (early suppression fast response) pendent sprinklers for storage: the VK500 K14, VK503 K16.8, VK506 K22.4, VK510 K25.2 and VK514 K28 for storage up to 50 ft, and the VK512 K25.2 dry pendent version for freezers.
Valves include the Model F-1 and Model VXR dry pipe valves, the Model J-1 alarm check valve and the Model EA-1 electronic accelerator for dry systems. Foam products include the Model VLF in-line balanced pressure proportioner and the Model VNR wide-range proportioner in 6 and 8 inch sizes.
Where Viking equipment is used
Warehouses and distribution centres, cold stores, factories, car parks, hangars and fuel and chemical storage, in sprinkler, dry pipe and foam-water systems designed to NFPA standards and local civil defence rules.
Viking products we list
Ordering Viking products: what we need
Send the Viking part number or model, the size, finish and temperature rating for sprinklers, the size, pressure rating and trim for valves, and the approvals (UL, FM) the project requires, together with the quantity and delivery location.
Facts checked against Viking Group's own history pages (vikinggroupinc.com), October 2026.
Browse Viking products by category: Fire Fighting.
FAQ
Questions about the Viking Model VNR Wide-Range Foam Proportioner, 6 in
Answers from our engineering team on installation, compatibility and integration.
01What proportioning rate does the Viking VNR use?
It is configured for 3 percent foam concentrate proportioning with listed and approved concentrates.
02Which sizes does the VNR come in?
6 in (DN150) and 8 in (DN200) wafer sizes.
03What is the VNR design pressure?
250 psi (17.2 bar), with a test pressure of 500 psi (34.4 bar).
04How is the VNR installed?
It is a wafer unit fitted between ANSI and PN16 flanges, horizontally or vertically, with flow direction marked on the body.
05What materials is the VNR made from?
A brass body with stainless steel rod, clapper and collar and a UNS C95800 orifice plate.
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