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What is the boiler shut-off valve used for?

Its main function is to fully open or fully close, which refers to the function of cutting off the water source. However, with the gradual development and improvement of shut-off valves, they now also have the function of regulating and throttling. Cutting off is to control the incoming water flow by closing the valve, while throttling is to seal by twisting the valve stem, apply pressure to the valve disc, and prevent the medium from entering through the gap.

① The main function of globe valves in pipelines is to cut off or connect fluids. Globe valves have better flow regulation than gate valves, but they cannot be used for long-term pressure and flow regulation. Otherwise, the sealing surface of globe valves may be eroded and corroded by the medium, damaging the sealing performance.

② Globe valves can be used for pipelines such as water, steam, and compressed air, but should not be used for medium pipelines with high viscosity, easy coking, and easy sedimentation to avoid damaging the sealing surface.

Globe valves are used to cut off the flow of media and are suitable for situations that require frequent opening. The sealing components of a globe valve are the valve disc and valve seat. In order to ensure a tight closure of the globe valve, the mating surface between the valve disc and valve seat should be ground or fitted with gaskets. Alternatively, corrosion-resistant and wear-resistant materials such as bronze and stainless steel can be embedded in the sealing surface. The disc and stem of the globe valve are connected in a movable manner to facilitate a tight fit between the disc and stem. The lifting and lowering of the valve disc of a globe valve is generally controlled by the valve stem. The upper part of the valve stem of a globe valve is a handwheel, and the middle part is a threaded and packing sealing section. The function of the packing is to prevent the medium inside the valve body from leaking along the valve stem.