A goggle valve is a type of valve used for positive isolation in industrial pipelines, particularly in large diameters.
A goggle valve, also known as a line blinding valve, is a specialized piece of equipment primarily used to positively isolate downstream media flow. This means they create a complete physical barrier within the pipeline to prevent any passage of fluids, gases, or solids.
Key Characteristics
Based on their design and application, goggle valves possess specific features that distinguish them:
- Purpose: Their core function is to provide 100% ” Man Safe” shut-off. This ensures that when the valve is closed, personnel working downstream are completely protected from any potential flow or leakage from the upstream side. This is crucial for safety during maintenance, repair, or inspection activities.
- Application Size: These valves are typically designed for large pipelines. According to information from SchuF, they are typically used in 20″ (DN 500) to 72″ (DN1800) diametre lines. This indicates their use in heavy industrial applications where large flow volumes are common.
- Design: They utilize a unique line blinding mechanism, often involving a spectacle-shaped plate (resembling goggles, hence the name) with one open end (for flow) and one solid end (for blockage). By rotating or moving this plate, the line can be either open or completely blinded.
In essence, a goggle valve is a robust and reliable solution for critical isolation needs in large-scale industrial processes, ensuring absolute shut-off capability for enhanced safety.
