What is the difference between globe valve and stop check valve?
To understand the difference between globe valve and stop check valve, we should first figure out what is a stop check valve.
Stop check valve combines the functions of a general globe valve and check valve, which means besides isolating and regulating the flow rate, it can also prevent reverse flow.
From the appearance, globe valve and stop check valve almost look the same. The main difference lies in the structure of their disc and stem.
For globe valve, the stem permanently affixed to the globe disc. While in the stop check valve structure, the stem head floats in the globe disc. When we raise the stem, the internal disc performs as a lift check allowing it to freely move up and down. When backflow occurs, the disconnected disc functions as a piston check and quickly closes, preventing reverse flow. When we lower the stem to press the disc against the seat tightly, the valve functions as globe valve to isolate the flow.
Stop check valves are widely used in high pressure & temperature applications or wherever steam is being utilized, often in power plants or steam generation facilities.