A post indicator valve (PIV) is a device assembly used to open or close the water-supply to fire protection systems in large structures. It contains butterfly valve or a normal door located on the fireplace program water main with an increasing post that protrudes above ground level or from a wall. A visual gauge of the valve position and the device actuator are housed at the very top of the post. This arrangement permits the device shut and to be opened easily and because of its position to be clearly seen. The three primary kinds — ground, pedestal, and — are installed in orientations and different shapes.
The fire protection systems in large buildings and industrial plants are generally fed by underground or wall cavity mains. These techniques contain stand pipe installations, aerosols, flooding, foam, and sprinklers, and all contain at least one chief isolation device, normally of the post gauge type. This valve is commonly set at the point of any fire system or subsystem, and the genuine door or butterfly mechanisms are generally underground or in wall cavities. To ensure that they got and can be easily seen, a device position indicator and the handles are put on a prominent post that projects above the wall or ground surface.
The three most common types of post indicator valve are wall, base, and earth. Each variety is appropriate for different types of water main installments although all have several common features and function in the exact same way. The earth post sort is normally utilized where the valve is found outside a building. It features a high, vertical post with its lower part buried in the ground and usually h AS a securing, wrench kind of operating handle at the very top. The open/closed goal or indicator dish is situated below the best of the post behind a windowpane and gives a clear visual indication of the status.
The gauge valve that was pedestal is utilized inside buildings with water mains. This form is similar in many regards to the ground post kind apart from the post method that is increasing. This device features a post equipped with a flange which is bolted onto a concrete plinth or stand. The remaining part of the valve post mechanisms remain the same as the earth post valve.
Where the water primary passes by means of a wall cavity the wall piv is used. A short post that protrudes horizontally from the wall is featured by this valve type. This kind usually h AS a handwheel kind of actuator and the same status indication to the other varieties.
There are cases when it is almost hard to install a free standing post indicator valve thanks to factors that are sensible. In which case, a wall post index is the option that is best. Functionally speaking, both the wall post indicator device and the perpendicular post indicator valve are precisely the same; but rather of being half-buried on a lawn, a wall post indicator valve is installed through a wall for connecting to the valve body found within the wall cavity of the building.