The L&J Technologies 94530-3A Snap Action Vacuum Vent is used for liquid storage tank applications where controlled vacuum relief is needed to help protect tank systems from excessive internal vacuum conditions.
This snap action vacuum vent permits air to enter the tank when the internal vacuum exceeds the vent setting, supporting pressure/vacuum control in applications where predictable vent opening is important.
Unlike standard vacuum venting equipment that may open gradually, the 94530-3A uses a snap action design to provide full opening at the set point.
The vent remains tightly closed below the vacuum setting and under positive pressure, helping maintain tank system closure until vacuum relief is required.
This design is also used as a replacement option for ruptured discs in systems where pressure spikes can cause premature disc opening.
The 94530-3A is designed for installation into the tank nozzle and is available for standard API and ANSI connections. It supports liquid storage tank protection strategies where vacuum relief, tight sealing, and defined opening behavior are important considerations.
Key Characteristics
- Snap action vacuum vent for liquid storage tank applications
- Allows air flow into the tank when internal vacuum exceeds the vent setting
- Holds tightly closed below the set point and at positive pressures
- Magnetic latch design supports full-open action at set pressure
- No overpressure required for full opening
- Designed for replacement of ruptured discs in applications affected by pressure spikes
- Mounted into the tank nozzle
- Available for standard API and ANSI connections
- Designed for static pressure applications up to 3 PSI
- Temperature range from -20°F to +220°F
- Vacuum settings available up to 43” water column
Ideal Applications
- Liquid storage tank vacuum relief
- Tank protection equipment for controlled air intake
- Applications requiring snap action vacuum vent opening
- Systems where tight sealing is needed below the vacuum set point
- Replacement applications where ruptured discs may open prematurely due to pressure spikes
- Storage tank installations using standard API or ANSI connections
Industries Served
- Oil and Gas
- Chemical Processing
- Pulp and Paper
- Wastewater
- Food and Beverage
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