The Viking™ VK791 C-1 Window Sprinkler (Part Number 01321BA) is a durable, open-type sprinkler designed for use in deluge fire protection systems. It provides dependable protection for windows, walls, and roofs that could be exposed to heat or flames from nearby fires. When the system activates, the sprinkler produces a wide, fan-shaped spray of water that forms a curtain to block heat and flames from entering through glass or open areas.
Made from strong, corrosion-resistant brass, the VK791 offers long-lasting reliability in harsh environments. It features a 1/2-inch NPT connection for easy installation and a 5/16-inch orifice that delivers a 2.1K discharge factor. This design allows the sprinkler to provide a higher water flow compared to smaller models, giving better coverage for wider or taller openings that need stronger water protection.
Product Overview
The VK791 C-1 Window Sprinkler produces a 180-degree fan-shaped discharge pattern that spreads water evenly along a window or wall surface. This curtain of water helps cool exposed materials and prevents fire from spreading through openings or weak points in the structure. The sprinkler is built to perform effectively in demanding conditions, with a minimum operating pressure of 7 psi and a maximum rated pressure of 175 psi.
The smooth, even spray pattern created by the VK791 makes it ideal for protecting glass façades, perimeter walls, and structural openings near fire hazards. In deluge systems, multiple sprinklers are typically positioned side-by-side so that their sprays overlap slightly, creating a continuous barrier of water. This design helps stop radiant heat and flames from passing through, protecting both people and property inside the building.
With its compact design and tough brass body, the VK791 can be used in many different settings—from industrial plants and power stations to commercial buildings and transportation hubs. It’s especially useful where heat from nearby structures, tanks, or equipment could threaten windows or wall openings.
Listings and Approvals
The Viking™ VK791 C-1 Window Sprinkler is UL Listed and FM Approved for use in fixed fire protection systems. These approvals confirm that the sprinkler meets strict fire safety and performance standards for open-type sprinklers in deluge applications. It has been tested for flow performance, pressure capacity, and spray distribution to ensure consistent and dependable results.
Use of this sprinkler must follow the manufacturer’s published installation guidelines and comply with applicable local fire codes and standards. Following these requirements ensures that the system will perform as intended in the event of a fire.
Installation and Maintenance
To get the best performance from the VK791, it must be installed exactly as shown in the approved system drawings. The sprinkler should be aimed so that the 180-degree spray pattern covers the window or wall evenly. Only the manufacturer’s specified wrench should be used to install it, and torque must be applied carefully to prevent thread or seal damage. During construction, the sprinkler’s waterway should be protected from dirt and debris, and all protective covers should be removed before testing.
Regular inspection and maintenance are important to keep the VK791 working properly. Check that the sprinkler’s deflector and openings are clean and free from corrosion or blockage. Make sure the sprinkler is securely mounted and correctly aligned, with no new obstructions that could block the spray pattern. If any damage, corrosion, or misalignment is found, the sprinkler should be replaced immediately.
With its rugged brass construction, simple installation, and reliable 180-degree spray, the Viking™ VK791 C-1 Window Sprinkler delivers effective protection for windows and walls that face fire exposure risks. It’s a proven choice for building owners, engineers, and fire protection professionals who need dependable performance in critical deluge system applications.
