What occurs when the two-way pilot valve in the diaphragm gas valve is activated?

When the two-way pilot valve in a diaphragm gas valve is activated, the primary function is to control the flow of gas through the valve by manipulating the position of these ports. In this scenario, the correct answer indicates that when the pilot valve is activated, the supply port closes and the bleed port opens.

This operation is critical for controlling the pressure and flow of gas. Closing the supply port effectively stops the flow of gas into a system or a specific segment, while opening the bleed port allows for the safe release of gas or pressure that has built up. This design ensures that the diaphragm can operate properly without the risk of over-pressurization, helping to maintain safety and function within the gas management system.

Activation of the two-way pilot valve thus allows the system to manage gas flow dynamically, responding to changes in demand or pressure by sealing the supply line when necessary and allowing for controlled venting through the bleed port. This precise action underscores the importance of the pilot valve's role in gas valves, emphasizing its utility in system control.