A valve stem is the component responsible for transmitting motion to the valve's internal part (the disk, ball, or plug), which in turn controls the flow of fluid. The acronym "STEM" is not a standard industry term for a specific type of valve, but instead, describes a key component found in many valve designs. These valves are used across numerous industries for purposes ranging from simple on/off control to precise flow regulation.
Types of stem movement
Valves are categorized based on how the stem moves to actuate the valve.
Linear motion (Multi-turn)
In these valves, the stem moves up and down in a straight line to operate the closure element.
Rising stem: The stem is threaded and rises out of the valve body as it opens, providing a visual indicator of the valve's position. This is common in high-pressure and large-diameter applications.
Non-rising stem: The stem remains stationary and the valve's gate or disc travels up and down on the stem's threads, which are inside the valve body. This design is useful in confined spaces or underground installations.
Sliding stem: These stems slide linearly rather than rotating, and are often used with pneumatic or hydraulic actuators for fast, automated control.
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