JIV-40B-E Intake Valve for Screw Compressor

1. Purpose and Operating Principle

The valve performs several functions within a single housing:

• Inlet pressure regulation — a normally open valve that controls air intake during compressor operation and closes the intake line on shutdown.
• Check (protective) function — during an emergency stop, the valve seals the inlet tightly and prevents oil from being expelled through the suction port.
• Unloading and make-up air — the valve has an unloading and make-up function that effectively eliminates cavitation noise generated by the main unit (the screw rotor pair) under certain operating conditions.
• Integrated functions — a relief valve, a make-up valve, a solenoid valve, and a proportional valve are all combined in a single assembly, simplifying and speeding up installation compared to separate units.

2. Technical Specifications

⚠️ The manufacturer’s series page does not specify an exact power range (kW/HP) for the 40B size specifically — RedStar describes the AIV/JIV series as a whole, without a size-by-size breakdown. Before ordering, confirm compatibility with your screw element’s power rating with the manager: +373 22 503-580.

3. Design Features

Designation Breakdown

Design Solutions

• A single housing combines unloading, make-up air, and proportional regulation functions — replacing several separate units on the suction line
• 220–230 V solenoid control — compatible with the compressor’s standard single-phase control circuit
• The check function prevents oil from being expelled through the suction line on a sudden compressor stop
• Designed to suppress cavitation noise from the screw rotor pair via the make-up air function

4. Installation Recommendations

• Before installation, fully stop the compressor, release pressure, and disconnect the electrical panel from power.
• The valve is installed at the air filter inlet into the screw element — observe the air flow direction marked on the housing (arrow).
• Check that the nominal diameter (DN40) matches the connection size on your compressor — the valve size is selected for a specific screw element model, not universally.
• Connect the solenoid coil strictly to 220–230 V per the compressor’s wiring diagram; do not apply voltage above the rating.
• After installation, check gasket/seal tightness at the connection to the suction port — because the valve integrates multiple functions, a leak here causes several different symptoms at once (reduced output, cavitation noise, oil discharge on shutdown).
• ⚠️ The connection type (thread/flange) for this model is not detailed by the manufacturer on the public page — verify mounting dimensions against your compressor before ordering, ideally attaching a photo of the original valve or the parts diagram.

5. Applicability and Comparison

Applicability (confirmed by a RedStar reseller partner)

The JIV-40B-E valve (and the JIV size range) is installed on screw compressors of the following brands: Berg, Comaro, Comprag, CrossAir, Dali, ET, Ingro, Ironmac, Hansmann, Magnus, Mark, Remeza, Triumph, Bezhetsky Zavod, and other models on compatible Chinese-made screw elements.

Cross-References

⚠️ Exact cross-reference part numbers from other valve manufacturers (Kaeser, Atlas Copco, Ingersoll Rand, etc.) for this specific model have not been verified. Some parts suppliers use the same “JIV-40B” designation as a generic size name, but there is no confirmed direct cross-reference to branded OEM valves. We avoid the vague claim “equivalents are available” — send a photo or the marking on your compressor’s original valve and we’ll match it to the exact equivalent.

Comparison with Neighboring Sizes in the Series

6. Common Mistakes

• Installing the wrong diameter (DN) valve — if the nominal diameter doesn’t match the mounting location on the element, the air path either leaks or creates excess flow resistance.
• Incorrect installation direction — installing against the air flow arrow disrupts the operation of the integrated unloading and check mechanisms.
• Ignoring the solenoid voltage — attempting to power the coil from a supply other than 220–230 V will damage the solenoid.
• Skipping the post-installation leak check — because the valve is multifunctional, a leak at this assembly disguises itself as very different symptoms (noise, pressure loss, oil discharge), making diagnosis harder if not checked right after installation.
• Ordering “by eye” without checking mounting dimensions — the JIV size range is not universal; ordering without checking against the compressor’s parts diagram risks a size mismatch.

7. Application

• Oil-injected screw compressors with a DN40 suction line
• Compressors of the Berg, Comaro, Comprag, CrossAir, Dali, ET, Ingro, Ironmac, Hansmann, Magnus, Mark, Remeza, Triumph, Bezhetsky Zavod brands and similar models on compatible screw elements
• Replacing the original intake valve during scheduled maintenance or when cavitation noise appears on the suction side
• Situations requiring a single assembly combining unloading, make-up air, and proportional regulation, without assembling separate valves on the line

8. Expert Opinion

“The intake valve of a screw compressor is a part you rarely think about — until it starts making noise, or until a characteristic oil discharge appears from the filter when the compressor stops. The JIV-40B-E is a good fit because it handles several tasks in one housing — unloading, make-up air, and check protection — meaning fewer joints and fewer potential leak points on the suction line. But precisely because of that multifunctionality, it’s critical not to get the size and fit wrong when ordering: the manufacturer doesn’t publish a direct ‘valve to compressor power’ table, so I always recommend checking the actual connection diameter and, if possible, sending a photo of the original part before ordering — that brings the risk of a mismatched order down to essentially zero.”

Vitali Boluchevski, Lead Engineer, Acvatron SRL, 18 years of experience

9. FAQ

❓ Is this valve suitable for an oil-free screw compressor? No. The AIV/JIV series is designed specifically for oil-injected screw compressors — the integrated check function is designed to protect against oil discharge, which isn’t relevant for oil-free machines.

❓ How do I know if the JIV-40B-E will fit my compressor? Check the nominal connection diameter (DN40) and mounting dimensions against your air filter/suction port. The most reliable approach is to send a photo of the original valve or the compressor’s marking to confirm compatibility before ordering.

❓ What voltage does the valve’s solenoid run on? 220–230 V. Verify that the control voltage in your compressor’s electrical panel matches this range before connecting.

❓ What do the letters and numbers in “JIV-40B-E” mean? JIV is RedStar’s intake valve series for oil-injected screw compressors, and 40 is the nominal diameter (DN40) in mm. The exact meaning of the “B” and “E” letters (variant/modification) is not published by the manufacturer on the public page.

❓ Is the valve supplied as a complete assembly, or are additional parts needed for installation? The valve ships as a single complete assembly (with the relief valve, make-up valve, solenoid valve, and proportional valve integrated). Confirm the exact delivery scope — whether seals/gaskets are included — with the manager.