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Breather valve

Cashco Breather Valves—also known as conservation or pressure/vacuum vents—are designed to protect storage tanks from overpressure or vacuum, preventing structural damage and product loss. In addition to maintaining tank integrity, some models include flame arrestors or pilot-actuation to meet safety and emissions regulations. Essential in oil & gas terminals, refineries, chemical storage, and marine environments, Cashco’s breather valves ensure safe containment while complying with API 2000 and ISO 16852.

Product Categories

Cashco breather valves fall into these families:

Model 5500: Pilot-operated conservation vent with pipe-away
Model 6K00: Pressure/vacuum breather with built-in flame arrestor
Model 3400/4400: Pressure-only vents (weight-loaded/spring-loaded)
Model 3200/4200: Pressure/vacuum conservation vents (weight/spring)
Model 3100/4100/5100/5200: Pressure/vacuum vents for atmosphere or header
Model 7A00/1088 etc.: Specialty buckets and blanketing valves

Shared Key Features

Set Pressure Range: from ~1.2 in WC (~3 mbar) up to 15 psig (~1 bar)
Size Options: DN50 to DN300 (2″–12″); standard ASME/PN flanges
Materials: Carbon steel, aluminum, 316 SS; 316SS trim/pilot parts
Vacuum Relief: Many models include ~0.5–1 psig vacuum protection
Condensate Drain & Self-Draining Housing: Prevents freeze-binding
Easy Maintenance: Pilot and seat inspection/repair without changing set-point

1.2.1.4: Category Details

1.2.1.4a Model 5500 – Pilot-Operated Conservation Vent (Pipe-Away)

Intro: The Model 5500 is a pilot-operated conservation valve designed to relieve overpressure without venting vapors into the atmosphere. It’s ideal for systems requiring piping to a flare or vapor recovery system. Maintenance can be performed in situ, preserving settings and reducing downtime.

Specifications:

Operating Pressure: 3.2–15.0 psig (0.22–1.03 bar)
Operating Temperature: ambient (–40 to +60 °C typical)
Line Size: DN50–DN300 (2″–12″); ASME 150 flanged
Leakage: Air-cushioned seating for tight shutoff
Wet parts: Carbon steel or 316 SS body; FKM diaphragm; 316SS pilot parts
Maintenance: Main seat inspectable without affecting set-point; pilot replacements possible while installed
Extras: Self-draining housing, condensate drip rings

Model 6K00 – Pressure/Vacuum Vent with Flame Arrestor

Intro: The 6K00 combines flame arrestor and conservation vent functions in one unit. It opens to relieve pressure or vacuum and includes a flame path to prevent ignition of tank contents—ideal for bulk storage of flammable liquids.

Specifications:

Certifications: ATEX II 1/2 D/E; ISO 16852; ISO 28300; API 2000
Line Size: DN50–DN300 (2″–12″)
Connections: DIN PN10 or ASME 150 RF flanged
Leakage/Class: Qualified flame arrestor performance
Application: Bulk storage protection with flame mitigation

Model 3400 / 4400 – Pressure Relief Vents

Intro: For basic overpressure protection, the 3400 (weight-loaded) and 4400 (spring-loaded) models relieve tank pressure to atmosphere. Simple and cost-effective, they can later be upgraded to conservation or pilot-operated types.

Specifications:

Set Pressure: 2.0 psig (0.13 bar)
Sizes: DN50–DN300; flanged 150# or PN
Retrofit: Convertible to 5200/5500 series

Model 3200 / 4200 – Pressure/Vacuum Conservation Vents

Intro: Combining pressure and vacuum relief, the 3200 (weight-loaded) and 4200 (spring-loaded) conserve vapors while protecting against both overpressure and vacuum. Suitable for atmospheric tanks in petrochemical or petro-storage applications.

Specifications:

Pressure: 2.0–15 psig (up to 1 bar)
Vacuum Relief: 1.0–15 psig
Retrofit Capable: Field-upgradable to higher models

Model 3100 / 4100 / 5100 / 5200 – Pressure/Vacuum Vents

Intro: These pilot-equipped conservation vents offer tight set-point control and enhanced vapor conservation. The 5100 vents to atmosphere, while the 5200 vents to headers—ideal for tanks where emissions must be managed precisely.

Specifications:

Pressure Set: 0.5–15 psig (0.03–1 bar)
Vacuum Relief: 0.5–15 psig
Sizes: DN50–DN300 (2″–12″)
Materials: Carbon or SS body with 316SS internals

Applications

Oil & Gas Terminals: Tank farms, vapor recovery
Chemical Manufacturing: Batch and storage containment
Marine & Offshore: Deck storage, ballast tanks
Refineries & Utilities: Atmospheric or vacuum vents for tanks/pumps
Cryogenics: Protection for low-temp storage vessels

Notable Features

Reusable Set-Point: Pilot models allow inspection without reset
Condensate Management: Drip rings and self-draining housing prevent freezing
Field Retrofit: Models 3400–5200 can be upgraded without replacing housings
Flame Safety: 6K00 meets ISO 16852 for explosion protection
Material Options: From carbon to 316SS, with FKM/EPDM/FEP diaphragms

Why Choose Cashco Breather Valves

Robust Safety: Pilot-operated accuracy ±5% of scale
Ease of Maintenance: Visual inspection, in-situ adjustments
Global Compliance: ASME, API 2000, ISO, ATEX
Vapor Conservation: Minimizes emissions for regulatory compliance
Flame Arrestor Option: Built-in for flammable storage risk
Upgradeable System: Retrofit design saves cost and downtime

Conclusion

Cashco Breather Valves delivers versatile, reliable pressure/vacuum management with strong safety features and ease of maintenance. Their modular design and compliance with international standards make them ideal for industrial and storage applications where safety, emissions control, and operational continuity are priorities.

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We cover over different solution all across the board.

We cover over 16 industries all across the board.

Breather valve

Product Categories

Shared Key Features

1.2.1.4: Category Details

1.2.1.4a Model 5500 – Pilot-Operated Conservation Vent (Pipe-Away)

Specifications:

Model 6K00 – Pressure/Vacuum Vent with Flame Arrestor

Specifications:

Model 3400 / 4400 – Pressure Relief Vents

Specifications:

Model 3200 / 4200 – Pressure/Vacuum Conservation Vents

Specifications:

Model 3100 / 4100 / 5100 / 5200 – Pressure/Vacuum Vents

Specifications:

Applications

Notable Features

Why Choose Cashco Breather Valves

Conclusion

Inside Ygen

We cover over different solution all across the board.

We cover over 16 industries all across the board.

Breather valve

Product Categories

Shared Key Features

1.2.1.4: Category Details

1.2.1.4a Model 5500 – Pilot-Operated Conservation Vent (Pipe-Away)

Specifications:

Model 6K00 – Pressure/Vacuum Vent with Flame Arrestor

Specifications:

Model 3400 / 4400 – Pressure Relief Vents

Specifications:

Model 3200 / 4200 – Pressure/Vacuum Conservation Vents

Specifications:

Model 3100 / 4100 / 5100 / 5200 – Pressure/Vacuum Vents

Specifications:

Applications

Notable Features

Why Choose Cashco Breather Valves

Conclusion