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BICERA Crankcase Explosion Relief Valves from Penn-Troy

Introducing the New BICERA Sigma Valve


Stringent tests prove the BICERA Sigma Valve works better to protect people and property.


Providing you with unprecedented engine design flexibility.


Half the weight of current valves, to reduce the impact from vibrations.  


Aligns perfectly with the mounting pattern of your existing equipment.


Our design protects more while using less material, offering  you more value.


We made the world’s first crankcase explosion relief valve, and we have the best.

By far, the industry’s best crankcase explosion relief valve


The New BICERA Sigma Valve – Available in 7 Industry-Standard Sizes

Featuring the ultimate flame arrestor, the new BICERA Sigma Valve crankcase explosion relief valve is available in seven industry-standard sizes to fit your engine and existing mounting pattern. *ESR stands for ExploSion Relief

98 ESR

98 ESR

Fits engines with a relief opening of 87 mm.

122 ESR

122 ESR

Fits engines with a relief opening of 110 mm.

150 ESR

150 ESR

Fits engines with a relief opening of 135 mm.

162 ESR

162 ESR

Fits engines with a relief opening of 150 mm.

173 ESR

173 ESR

Fits engines with a relief opening of 160 mm.

224 ESR

224 ESR

Fits engines with a relief opening of 210 mm.

266 ESR

266 ESR

Fits engines with a relief opening of 252 mm.

Competitors vs BICERA Sigma

Size Matters.

Big Time.

That’s why the design of the ultra-efficient flame arrestor in the new BICERA Sigma Valve is so innovative. The Sigma valve:

  • Is nearly 25% smaller and almost 50% lighter*
  • Occupies less space in your inventory

And, for engine designers, the smaller, lighter BICERA Sigma Valve offers increased design flexibility

  • More space to add new features
  • Advantages for weight-sensitive equipment

* than competing valves


BICERA Valves Produced
Top Engine Manufacturers Using BICERA Valves
Reports of Death, Injury or Engine Room Damage from Crankcase Explosions
Years’ Experience

Valves In Action

You Have A Problem. We Have The Solution


“Ariel depends on Penn-Troy as they’ve got a lot of experience. They’ve been around a long time and they’re easy to work with.  We use the Bicera products for explosion relief and any type of gas pressure leaks.” 

- Trent Mason, Ariel Corporation