CROAC ERn 4187

CROAC Pneumatic Volume Booster Relay ERn 4187

Description

This is a pneumatic volume booster, model ERn 4187, manufactured by CROAC of France, a company later acquired by Crouzet. This component is designed to take a pneumatic signal and reproduce it with a much higher flow rate, allowing for the rapid operation of large pneumatic actuators, clutches, or brakes without a significant pressure drop. Its robust aluminum construction ensures durability in industrial environments. This is an excellent replacement part for legacy systems relying on CROAC components.

Specifications

• Manufacturer: CROAC
• Model: ERn 4187
• Function: Pneumatic Volume Booster / Relay
• Body Material: Aluminum
• Control: Manual adjustment knob

Label Info

• Brand: CROAC
• Address: 74130 BONNEVILLE – FRANCE
• Model: ERn 4187
• Code: 106

Application

Typically used in applications requiring fast response times from large volume pneumatic devices, such as large bore cylinders, pneumatic presses, and valve actuators in various manufacturing and process control industries.

Country of Origin

Made in France.

CO2 Impact

Choosing this pre-owned component over a new one prevents the emission of approximately 6 kg of CO2, which is associated with the production of new aluminum and electronic parts. This is a sustainable choice for your operations.

Availability

This item is a used, tested component in good working condition. Ready for immediate dispatch. Order now from spareparts2day for expert support and fast delivery.

FAQ

Question?
What is the primary function of a pneumatic volume booster like the ERn 4187?

Its main purpose is to increase the speed of pneumatic actuators. It uses a small-volume signal from a control valve to control a high-volume air supply directly to the actuator, bypassing the flow limitations of the control valve itself.

Question?
Can I use this booster to increase the pressure of my signal?

No, this is typically a 1:1 ratio relay. It reproduces the input signal pressure at the output but with a much higher flow capacity. It does not amplify the pressure itself.

Question?
What should I consider when installing this legacy CROAC component into a modern system?

Ensure that the port threads are compatible with your existing fittings (they may be BSPP or NPT, common in European and American systems respectively). Also, verify that the operating pressure range of this device is suitable for your system’s requirements.

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Last Update: Friday, March 13, 2026