For over 85 years Protectoseal has been an industry pioneer and leading manufacturer of quality products that conserve and control volatile emissions and protect low pressure storage tanks, vessels and processes from fire and explosion.

Our integrated line of pressure and vacuum relief vents, flame/detonation arresters and related vapor control devices are used primarily in process industries.

Pressure and Vacuum Relief Vents

Vents that are specifically designed to prevent storage tank damage by relieving internal pressure and vacuum accumulations that occur as a result of day-to-day operations (filling, emptying and atmospheric temperature changes). These products also minimize product evaporation losses.


Emergency Pressure Relief Vents

Emergency Vents are designed to prevent the catastrophic rupture of a storage tank by relieving the internal pressure accumulation caused by external fire involvement of the tank.



Flame and Detonation Arresters

Flame and Detonation Arresters provide a positive barrier against the propagation of a flame through a piping system or into a storage tank’s vapor space.


ATEX / CE / ISO Flame and Detonation Arresters

Detonation ArrestersFlame and Detonation Arresters approved according to the current ATEX Directive, ISO Standard 16852.



Tank Blanketing Valves

Blanketing Valves sense the pressure in a tank’s vapor space and regulate a supply of pressurized inert gas into the tank so that a desired pressure range may be consistently maintained.



Liquid Level Indicators

LIQUID LEVEL INDICATORSLiquid Level Indicators are used for accurate liquid level gauging of fixed or floating roof storage tanks. Suitable for water, oils, solvents and other products.




Special Tank Vents and Fittings

660Miscellaneous equipment required for the safe and efficient operation of storage tanks and related processing facilities. Products include: Air Dryers, Gauge Hatches, Internal Safety Valves, Overflow Valves, Water Drain Valves and more.


Fuel Tank Safety Caps

Combination safety fill cap, flash arrester and pressure / vacuum relief device designed for installation in fuel tank openings of gasoline or diesel-powered equipment.



Protectoseal Fuel Tank Safety Caps

Protectoseal Fuel Tank Safety Caps with Flash Arrester

Safety Shut-Off Valves

safety-shutoffvalve-productHeat actuated safety shut-off valve is specifically designed for installation in the withdrawal lines of flammable or combustible liquid storage tanks.



Protectoseal Series U1-45 Specifications