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This is a technical series summarizing the basic concepts and practical application points of PSV (Pressure Safety Valve) that are essential to know in the field. Rather than focusing on complex theories, I have captured only the key essentials to make them easy to understand from a real-world, on-site perspective.

Discover the critical 'Face-to-Face (F-to-F)' dimensions you must verify for a seamless PSV installation without piping modifications. In this edition, Nick explains the practical differences between API 526 and Maker Standards, the selection criteria for Bonnets and Levers based on fluid types, and essential safety warnings for using Test Gags to prevent major onsite accidents.

How does a PSV operate automatically without external power? Unveiling the secret of 'Pop Action,' the core mechanism of safety valves. We provide a comparative analysis between 'Full Bore' and 'Low Lift' types, explaining how they differ based on nozzle area and lift height, tailored for on-site engineers.

Do you know the secret of 'Back Pressure' in PSV selection? A complete guide to the structural differences between Conventional, Bellows, and Pilot types, and how back pressure affects set pressure. Nick from NEFSS provides practical insights on choosing the right PSV type for your specific process requirements.

NEFSS Nick presents a comprehensive guide to the definition and basic structure of Pressure Safety Valves (PSV). From KOSHA-based definitions to an easy-to-understand breakdown of the Body, Bonnet, and Cap, check out this essential guide for plant field professionals.

Hello, this is Nick from NEFSS . The hopeful year of 2026 has dawned. I wish you all a very Happy New Year! I still vividly remember taking the first steps of NEFSS last summer with great expectations and excitement. As a new entrepreneur, I faced many challenges, but I have been able to come this far thanks to those who have silently guided and supported me by my side. I would like to take this opportunity to express my deepest gratitude to a few special individuals. First,

Hello! This is Nick  from NEFSS . Today, I would like to introduce the Pneumatic Time Delay Valve , an essential component for industrial sites—especially in explosion-proof zones or areas requiring precise pneumatic control. Often referred to as an "Air Timer," this device is a mechanical delay unit that operates solely on compressed air, without any electrical signals. The photos shown here are of the actual units I personally photographed while working at YNV . I have witn

Hello, this is Nick  from NEFSS . Starting today, I’ll be sharing insights on various industrial products I’ve directly handled and managed in the field. Our first featured product is the YNV Lift Safety Relief Valve, Model HSV-3S1 . To be honest, this was a true "steady seller" and "cash cow" during my time at YNV. I remember my senior colleagues in the shipbuilding department consistently shipping out 200 units at a time. This high volume is a testament to the product's pro

To all those who visit our website,whether you’re spending it with family, a loved one, friends, or even on your own,we hope you have a warm and happy Christmas season. — NEFSS —

October 3 (Fri): National Foundation Day October 5 (Sun) – October 8 (Wed): Chuseok (Korean Thanksgiving) Holidays October 9 (Thu):...

NEFSS will officially begin operations in mid-August.