What does an "osandy valve" refer to in sprinkler systems?

An "osandy valve" refers to an outside screw and yoke valve in sprinkler systems. This type of valve is commonly used for controlling the flow of water within a piping system, specifically in fire protection systems like sprinkler installations.

The term "outside screw and yoke" describes the design features of the valve. The "outside screw" refers to the valve operator, which is typically a threaded screw located on the outside of the valve body, allowing for easy adjustment and operation. The "yoke" provides support for the screw mechanism and helps in the regulation of water flow. This design is particularly advantageous in preventing leaks and ensuring reliable operation in outdoor settings.

This functionality is crucial for fire protection systems, as it allows for straightforward control over water supply in the event of an emergency, making maintenance and operation much more efficient for service personnel. The other options presented do not accurately describe a commonly recognized valve type within sprinkler systems, which emphasizes why the identification of the osandy valve as the outside screw and yoke valve is correct and relevant in this context.