The Structural Design and Function of Globe Valves
globe valve, also known as a stop valve, is a linear motion valve designed primarily for isolation, but it is also effective for regulation and throttling. Its key component is a plug-shaped disc with a flat or conical sealing face that moves linearly along the centerline of the valve seat.The main stop valve product names of China Stop Valve Network include:GB Cast Steel Flange Globe Valve,Self-sealing Straight-through Globe Valve,Flange Straight-through Low Temperature Globe Valve,GB Stainless Steel Flange Globe Valve,ANSI Flange Straight-through Globe Valve,Flange Straight-through Throttle Emptying Globe Valve,Pneumatic Flange Straight-through Globe Valve,Electric Cast Steel Self-sealing Tightly Globe Valve
Key Structural Features and Operation:
The disc's travel is relatively short, and the change in the seat opening is directly proportional to the disc's stroke. This precise relationship, combined with the valve's reliable shut-off capability, makes it highly suitable for flow control applications. The valve achieves a tight seal through forced sealing, requiring pressure on the disc during closure.
Flow Direction and Force Considerations:
Traditionally, the medium enters from below the disc. In this design, closing force must overcome both stem packing friction and medium pressure, requiring a robust stem. However, modern self-sealing globe valves often feature flow from above the disc. This innovation reduces the required closing force, allows for a smaller stem diameter, and enhances sealing integrity under pressure.
Installation and Full-Open Position:
Globe valves are typically installed horizontally. A critical operational characteristic is that maximum flow is reached when the disc opening is approximately 25-30% of the nominal diameter. This position is considered the valve's fully open state, meaning the full-open position is defined by the disc's stroke, not just its vertical lift.
In summary, the globe valve's robust design, precise disc-to-stroke relationship, and modern flow-direction improvements make it a versatile and reliable choice for shut-off, regulating, and throttling services across various industries.Do you still need to know or purchase the following globe valve products:
