25A Vacuum Safety Valve - Hirata Valve Industry | Protecting Tanks from Vacuum Failure

Luis Alberto Fing
Aug 26
2 min read

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Introduction

In demanding industrial environments, managing internal pressure is critical to the safety and longevity of tanks and vessels. The 25A Vacuum Safety Valve - Hirata Valve Industry offers a high-performance, engineered solution specifically designed to respond to vacuum conditions in process systems.

Close-up of the 25A Vacuum Safety Valve by Hirata Valve Industry, highlighting its robust design for industrial tank applications.

Ensuring Safety When Pressure Drops: 25A Vacuum Safety Valve - Hirata Valve Industry

While traditional safety valves are designed to release excess pressure, vacuum safety valves serve the opposite yet equally essential role: protecting equipment from implosion when internal pressure drops below atmospheric levels. The 25A Vacuum Safety Valve detects these conditions and reacts automatically to equalize pressure within the system.

This makes it indispensable in situations such as:

Rapid tank emptying during process operations
Cooling of heated tanks post-CIP (clean-in-place)
Thermal contraction due to sudden temperature drops

Key Features of the 25A Vacuum Safety Valve

Precision Control: Responds accurately to pressure differentials to prevent vacuum damage
Standardized Sizing: "25A" indicates a 25mm nominal diameter for easy integration
Simple and Reliable Mechanism: Utilizes a spring- or weight-loaded design for automatic valve operation
Corrosion Resistance: Constructed with durable materials such as stainless steel or carbon steel to withstand harsh environments including air and seawater mixtures

How It Works: Protecting Structural Integrity

When vacuum conditions arise inside a vessel, the 25A Vacuum Safety Valve opens to allow atmospheric air to enter. This swift action restores pressure equilibrium, preventing tank wall collapse and preserving the integrity of your equipment.

Its quiet, automatic function plays a crucial role in operational safety, especially in systems handling fluctuating temperatures or fluid levels.

Example: Technical Specifications

Below is a general example of the 25A Vacuum Safety Valve's technical specifications:

Elements	Specification
Set Pressure	–640 mmHg.G
Closing Pressure	—
Inlet Pressure	—
Outlet Pressure	—
Design Pressure	2 kg/cm²
Design Temperature	70 °C
Fluid	Air + Sea Water
Capacity	32 kg/h
Back Pressure	—
Inlet Flange	NPT1
Outlet Flange	—
Hydrostatic Test Pressure	3 kg/cm²G
Pneumatic Test Pressure	Shell: 2 kg/cm²G

NOTE: According to the user’s operational needs, the technical specifications may vary.

Example of Safety Valve Piping in Process Systems

Understanding the placement of vacuum and pressure safety valves is crucial for ensuring proper system design and operation. Below is a visual example of a typical safety valve piping layout.

Safety valve piping diagram on yellow background. Gray pipes and valves with gauges labeled: Stop Valve, Pressure Reducing Valve, Safety Valve. — Industrial Diagram: Hirata Valve Industry's safety valve piping system highlights effective steam control and safety measures. The layout features stop valves, a pressure-reducing valve with dual gauges, and a safety valve for overpressure protection, alongside an auxiliary bypass line.

Engineering Advantages of the 25A Vacuum Safety Valve Design

Engineered in Japan with exceptional attention to quality and durability, Hirata's 25A model embodies the reliability and precision that global industrial users demand. From chemical processing to marine and food applications, this valve is a trusted component in systems that cannot afford downtime or failure.

Ensure Operational Continuity with the 25A Vacuum Safety Valve

Investing in the 25A Vacuum Safety Valve is a proactive step toward safeguarding your industrial processes against the risks of vacuum failure.

Contact Nichiboku Ltd today to request further details.