What is used to connect a pressure gauge or pressure control to a steam boiler?

The use of an anti-siphon device is crucial in connecting a pressure gauge or pressure control to a steam boiler due to the necessity of preventing siphoning and ensuring accurate pressure readings. When pressure gauges or controls are connected to a steam system, they can be affected by fluctuating water levels and the potential for negative pressure, which could draw water into the gauge or control assembly. An anti-siphon device allows for the safe transmission of pressure without the risk of liquid being siphoned back into the system, thereby ensuring that the instruments operate correctly and provide reliable readings. This is particularly important in maintaining the safety and efficiency of the steam system.

In contrast, a manifold serves as a distribution point for multiple instruments, but it does not perform the specific function of preventing siphoning. A valve is typically used to control the flow of steam or water but is not specialized for this protective purpose. A transducer, while it may translate pressure readings into electronic signals, does not necessarily prevent siphoning either. The anti-siphon device is specifically designed to handle the unique conditions present in steam systems, making it the most suitable choice for this application.