For a large farm, irrigation is a necessity. The Rainbird Corporation manufactures brass irrigation valves, which are electrically controlled. When voltage is applied to the valve it opens, allowing water to flow through. For the GB series of valves, the input voltage for the valve to open is 24 volts AC. The water pressure the valve can handle is 15 to 200 pounds per square inch. The flow can be anywhere from 5 to 200 gallons per minute. These are very wide ranges, making this valve suitable for a variety of irrigation applications.
The Delta Corporation manufactures brass urinal valves for commercial bathrooms. These valves are chrome plated brass. The reason they are plated is for ease of cleaning to keep them sanitary. The specifications for these valves include that they are about 11 1/2 inches tall, and the inlet is 4 3/4 inches offset from the midline. The valves can accept water pressures anywhere from 9 to 100 pounds per square inch. The higher the water pressure, the faster the flush rate. For example, at 10 pounds per square inch, the flush rate is about 1 1/2 gallons per minute.
The Anderson Corporation manufactures ball valves. These valves have an internal ball, with a hole in the middle. When the ball is turned, it closes off the valve, preventing flow. Anderson makes valves accepting a pipe thread opening from 1/4 inch to 3 inches. From 1/4 inch to 1 inch, the maximum pressure is 600 pounds per square inch. From 1 1/4 inches to 2 inches, it is 400 pounds per square inch. From 2 1/2 to 3 inches, it is 200 pounds per square inch. Note that as the valve increases in size, the total pressure it can handle diminishes.