What is a PIV switch?
What is a PIV? In short, post indicator valves (PIVs) are sturdy, above-ground access and operator valves used for automatic sprinkler systems and wet standpipe systems whose main water supply valves are located underground.
What is the purpose of a post indicator valve?
Installed in the main water line serving a building, the Post Indicator Valve (PIV) is a valve used to control the water supply to the fire sprinkler system. Most commonly a raised post, the PIV is found in the yard near the building or mounted on the outside of the building.
What is the difference between pressure switch and flow switch?
Pressure Switches are activated when you reach a certain pressure: between 500-700 PSI. When the pressure meets this threshold, the switch is used to activate the burner for hot water. Flow Switches are activated by the recognition of water flow. The pressure is usually lighter, lower than 500 PSI.
What does PIV valve stand for?
automatic fire sprinkler
A postindicator valve (PIV) (photo 1) is commonly used as the valve operator for. automatic fire sprinkler and standpipe systems, where the system main valve is located. underground outside the building. PIVs may be located in paved or landscaped areas. If.
Is a PIV required?
History of the PIV Requirement While not a referenced standard from the International Building Code, the International Fire Code requires that all private fire service mains be installed in accordance with NFPA 24 (IFC 2000-06 Section 508.2.
What is OS & Y gate valve?
QUICK. April 2012. One type of valve commonly used to control water flow to fire sprinkler systems is known as an OS&Y gate valve. OS&Y means “outside stem and yoke” or “outside screw and yoke”. OS&Y gate valves operate by opening and closing via a gate, which lowers into or rises out of the valve.
What is PIV in fire?
A postindicator valve (PIV) (photo 1) is commonly used as the valve operator for. automatic fire sprinkler and standpipe systems, where the system main valve is located. underground outside the building. PIVs may be located in paved or landscaped areas. If.
What is the difference between a trouble supervisory and alarm fire alarm?
Trouble – A trouble condition means there is an issue or fault with the fire alarm system. Supervisory – A supervisory condition means there is an issue with a system, process, or equipment that is monitored by the fire alarm control unit (see supervision section).
What is a supervisory device?
Per NFPA definition, a supervisory signal initiating device is “an initiating device such as a valve supervisory switch, water level indicator, or low air pressure switch on a dry-pipe sprinkler system in which the change of state signals an off-normal condition and its restoration to normal of a fire protection or …