The Complete Guide to Globe Valve Selection, Sizing & Installation
Globe valves are essential components for controlling fluid flow. They operate by raising or lowering a disc onto a seat, making them ideal for shutoff, isolation, and throttling applications in pipelines. Known for their reliable sealing and precise flow control, they are critical in oil and gas, chemical processing, power generation, and water treatment plants.The main stop valve product names of China Stop Valve Network include:Flange Straight-through Globe Valve,Angle-type Globe Valve,Internal Thread Globe Valve,Bellows Globe Valve,High Temperature and Pressure Globe Valve,,Low Temperature Globe Valve,Globe Valve Installation,Globe Valve Selection
How to Choose the Right Globe Valve: Key Factors
Selecting the correct globe valve prevents leaks, reduces maintenance, and ensures system safety. Follow these core guidelines:
Valve Size & Pressure Rating: Always match the valve's Nominal Diameter (DN) and pressure class (PN/Class) to your specific pipeline requirements. Pro Tip: For optimal performance and manageable operation, globe valves are generally best suited for lines 250mm (DN250) or smaller.
Correct Installation Direction is Critical: Installation direction directly impacts valve operation and lifespan.
For Smaller Valves (Up to DN150): Use the standard "flow under the disc" (or "inlet under") orientation. This design uses line pressure to help keep the valve closed, reducing the force needed to operate it and enhancing seat sealing.
For Larger Valves (DN200 and Above): These typically require "flow over the disc" (or "inlet over") installation. Crucially, large valves should be fitted with a bypass valve. The bypass equalizes pressure before opening, drastically reducing the immense operational torque and protecting the valve stem and actuator.
Why Proper Selection Matters
Correct globe valve selection and installation are non-negotiable for long-term sealing integrity, extended valve service life, and overall operational safety. Understanding sizing limits and flow direction rules prevents costly failures and downtime.
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