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Shida Komusho 25A Vacuum Safety Valve – by Nichiboku Tech
- Luis Alberto Fing
- Aug 7
- 2 min read
Welcome to Nichiboku's industrial Blog
Introduction
The Shida Komusho 25A Vacuum Safety Valve is a critical component for protecting industrial systems against the dangers of excessive vacuum pressure. Engineered in Japan with over 100 years of expertise, this stainless steel safety valve delivers precise vacuum relief to ensure the integrity of tanks, pipelines, and processing systems. Designed for engineers, system designers, and plant operators, this valve exemplifies Japanese quality, certified performance, and long-term reliability.
Key Advantages of the Shida Komusho 25A Vacuum Safety Valve
Precision Vacuum Activation: Spring-loaded mechanism opens at a calibrated setpoint to quickly equalize pressure during unsafe vacuum conditions.
Stainless Steel Durability: Constructed from SUS304/SUS316 stainless steel for corrosion resistance and compatibility with clean processes and extreme temperatures.
Compact and Secure Installation: 25A flanged or threaded connection for tight integration and secure vacuum sealing.
Certified Safety: METI-certified design manufactured to rigorous Japanese high-pressure gas safety standards.
Reliable Sealing and Reseating: Prevents leaks during normal conditions, reseats cleanly after vacuum relief to avoid oscillation.
Technical Specifications
Nominal Size: 25A (25 mm / 1" NPS)
Pressure Range: Full vacuum up to 1.0 MPa (145 psi)
Materials:
Body: SUS304/SUS316 stainless steel
Spring: Calibrated alloy steel
Seat: Metal-to-metal or vacuum-rated sealing materials
Setpoint: Adjustable vacuum cracking pressure (e.g. −0.02 MPa to −0.1 MPa)
Application Areas
Protecting Cryogenic and LNG Systems
Vacuum formation during rapid unloading or cooling of cryogenic storage tanks can lead to dangerous implosions. This valve provides immediate atmospheric relief to preserve tank integrity.
Vacuum Equipment in Chemical and Pharmaceutical Plants
The valve ensures process equipment like reactors, sterilizers, and vacuum dryers are shielded from excessive vacuum, protecting both product quality and equipment lifespan.
Semiconductor and Research Vacuum Chambers
Used as a backup on vacuum chambers and pumps, it guards against deformation by admitting air when vacuum thresholds are exceeded, supporting safety and operational continuity.
Energy Sector Applications
In nuclear and conventional power plants, it maintains safe vacuum levels in steam condensers and related systems. The proven reliability of Shida Komusho valves adds vital assurance in mission-critical settings.
Technical Superiority of the Shida Komusho 25A Vacuum Valve
Over a Century of Japanese Engineering Expertise
Certified for High-Pressure Gas Safety (METI Japan)
Individually Tested and Quality Assured
Tailored for Extreme Conditions and Clean Applications
Vacuum-Specific Design for Accurate Performance
Expert Support and Customization Options Available
This valve is not a generic relief solution – it’s precision-engineered to meet the specific challenges of vacuum safety. Whether you're protecting a high-value cryogenic system or ensuring compliance in a pharmaceutical application, the Shida Komusho 25A delivers long-term performance and peace of mind. (others Shida Komusho products)
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