Overview
The Viking™ VK791 C-1 Window Sprinkler (Part Number 01321BF) is an open-type sprinkler designed for use in deluge fire protection systems. It helps protect windows, walls, and roofs that are exposed to fire or heat from nearby structures or equipment. When the system activates, the sprinkler releases a wide, fan-shaped sheet of water that forms a protective curtain to block heat and flames from entering through windows or openings.
Constructed from durable brass with a bright chrome finish, the VK791 is both strong and resistant to corrosion. Its clean appearance makes it suitable for visible installations in architectural or commercial settings. With a 1/2-inch NPT connection and a 5/16-inch orifice, it delivers a 2.1K discharge factor, providing smooth, even water flow across a wide area.
Product Overview
The VK791 C-1 produces a 180-degree fan-shaped spray pattern designed to spread water evenly along the surface of a window or wall. This sheet of water helps absorb heat and shields the structure from radiant energy, reducing the chance of glass breakage or flame spread. The sprinkler performs reliably at a minimum pressure of 7 psi and can operate safely up to 175 psi.
With its higher flow capacity compared to smaller models, the VK791 is ideal for larger openings or areas where additional water coverage is needed. Its precise deflector design ensures an even spray that remains stable under varying pressures. The combination of strong brass construction and a polished chrome finish makes it suitable for use in locations that demand both durability and appearance—such as commercial buildings, transportation hubs, and public structures.
When installed in a deluge system, several VK791 sprinklers are typically spaced along a wall or window so their sprays overlap. This overlap creates a continuous wall of water that helps stop flames and heat from spreading to other parts of a building. By forming a steady water curtain, the VK791 plays a key role in protecting people, equipment, and property in exposed areas.
Listings and Approvals
The Viking™ VK791 C-1 Window Sprinkler is UL Listed and FM Approved for use in fixed fire protection systems. These certifications confirm that the sprinkler meets strict standards for safety and performance. It has been tested for water flow, spray pattern, and pressure integrity to ensure consistent operation under real-world conditions.
The VK791 should always be installed and used according to the manufacturer’s technical data and the requirements of applicable fire protection standards. Following these guidelines helps ensure that the sprinkler performs as intended when exposed to fire conditions.
Installation and Maintenance
The VK791 must be installed in the correct position and orientation to ensure proper spray coverage. The sprinkler should be aligned so the fan pattern covers the entire window or wall surface. Use only the manufacturer’s specified wrench when tightening, and apply the proper torque to avoid leaks or thread damage. During construction, protect the sprinkler from dirt and debris, and remove any covers or caps before system testing.
Once installed, the sprinkler should be inspected regularly as part of a normal maintenance program. Check for any signs of corrosion, mechanical damage, or blockage, and make sure the spray path remains clear. Replace any damaged or obstructed sprinklers immediately to maintain full system protection.
Combining a sleek chrome finish, reliable brass construction, and a wide 180-degree spray pattern, the Viking™ VK791 C-1 Window Sprinkler delivers strong, consistent protection for exposed windows and walls. It is a dependable choice for architects, contractors, and fire protection professionals seeking long-lasting safety performance in both functional and visible installations.
