Which type of valve is usually used as the first valve off a receiver?

The king valve is specifically designed for use as the first valve off a receiver. This valve serves as a primary shut-off device and is typically used in high-pressure piping systems. Its design allows for efficient isolation of the system, which is essential in managing pressure and flow safely when the need arises, such as during maintenance or emergencies.

Unlike other valve types, the king valve can effectively manage the high-pressure conditions typically found in industrial environments. It provides a reliable means to control the flow of fluids or gases from a receiver, ensuring that operators can quickly and safely stop the flow when necessary.

The other types of valves, such as the ball, butterfly, and check valves, have specific functions that may not be suitable for use as the first valve off a receiver in high-pressure systems. Ball valves are excellent for on/off control but may not provide the same level of isolation as a king valve. Butterfly valves are also used for regulating flow but do not offer the same robust shut-off capabilities. Check valves prevent backflow but are not intended to isolate the flow from the system, making them unsuitable for this particular application.