In one design of a mechanical trap, what is used to open and close the trap outlet valve?

In a mechanical trap design, the use of a ball float is essential for the operation of the outlet valve. The ball float is a buoyant device that responds to the water level within the trap. As condensate accumulates in the trap, the float rises with the water level. Once a certain level is reached, the float's upward movement activates the mechanism that opens the outlet valve, allowing the condensate to drain away. When the water level decreases, the float drops, which closes the outlet valve, preventing any loss of steam.

This mechanism is highly effective in ensuring that condensate is efficiently removed from the system while also maintaining steam pressure. The direct relationship between the float's position and valve operation makes it a simple yet reliable solution for controlling the flow of steam and condensate in mechanical traps. This design is particularly favored for its reliability and straightforward operation in various steam applications.