Final answer:
The FP symbol in plumbing represents a fire protection system component like sprinklers. Air admittance valves help maintain balanced pressure for proper drainage, and drain traps prevent sewer gas entry while ensuring water flows freely.
Step-by-step explanation:
The plumbing symbol that looks like a cross and has FP listed represents a fire protection system, which includes components like sprinklers or standpipes. These are crucial for the safety of buildings, ensuring that there is a method to suppress fires quickly. Such symbols are standardized across plumbing and architectural plans to help professionals understand system layouts.
In the context of usual plumbing systems, air-filled tubes known as air admittance valves or vent pipes are installed to prevent vacuum formation, which can hinder the water flow and lead to slow drainage. They allow air to enter the plumbing system to replace water that has been flushed, maintaining a balanced pressure and enabling free flow of water.A device often found in sink drains to speed up the water flow is known as a drain trap. These traps are designed to maintain a small amount of water within them, forming a seal that prevents sewer gases from entering the building, yet still allowing water to flow freely.
The plumbing symbol that looks like a cross with 'FP' listed represents a water valve. This symbol is commonly used in plumbing blueprints to indicate the location of valves that control the flow of water in a plumbing system. Water valves are essential for turning on or off the water supply to specific fixtures or areas, such as faucets, toilets, or showers. They can be manually operated or automated, allowing for easy control over the water flow.