Atlas Copco 1622348981 — GA / GX Unloader Intake Valve with Solenoid

Atlas Copco · GA30–GA75 · Compressor Service Part · In stock

The 1622348981 is the OEM unloader / intake valve assembly used on Atlas Copco oil-injected screw air compressors in the GA and G series, including the GA30, GA37, GA45, GA55 and GA75 frames. The unit combines a modulating intake regulator with a loading / unloading solenoid valve in a single body, holding tank pressure between the configured upper and lower setpoints by venting the intake as required. It is a wear-grade service part — when a compressor refuses to load, idles in unload, or shows erratic tank pressure, the unloader is the first place a maintenance technician looks. KOEED supplies the 1622348981 against part-number requests and full BOM lists, with quote turnaround within one business day.

Key Technical Specifications / Overview

The 1622348981 is a combined intake regulator and loading / unloading solenoid assembly. It is fitted to the compressor air-end intake path and is responsible for admitting or blocking intake air in response to the line-pressure signal and the controller's load command. The body is cast aluminium with an integrated pneumatic actuator, and the solenoid coil is housed in a sealed DIN-style connector at the top of the valve. Replacement is normally triggered at 8,000–16,000 operating hours or whenever the controller flags an unload fault.

Application Scenarios / Where It Fits

The 1622348981 is found in factory automation environments where compressed air is a utility — anywhere a 30 to 75 kW oil-injected screw compressor is the main air supply. Typical sites include automotive body shops, tire and rubber workshops, general manufacturing, sandblasting bays, packaging lines, and process control rooms. The valve is the bridge between the compressor controller (which closes the loop on tank pressure) and the air-end intake (which physically admits or vents air). When a controller decides the tank is full it de-energises the solenoid and the unloader opens the intake to vent; when the tank drops to the lower setpoint the solenoid re-energises and the compressor loads again. The same maintenance contract that sources this unloader also covers the surrounding automation hardware, from Allen-Bradley and Siemens PLCs on the line to KEYENCE vision sensors in inspection cells.

• General manufacturing plants with on-site compressed-air distribution
• Automotive body shops and paint-prep lines (air for tools and blow-off)
• Tire shops, rubber moulding and tyre-building cells
• Sandblasting and surface-treatment booths
• Food & beverage packaging and PET blow-moulding lines
• Process control rooms and instrument-air loops
• Refurbishment shops rebuilding oil-injected screw compressors for resale

Integration & Wiring Notes

The solenoid coil is wired to the compressor controller's load / unload output. On a standard 24 V DC installation the controller drives the coil through a fuse-protected discrete output; on 110 V / 230 V AC variants the wiring goes through the same load contactor logic. A blown coil is the most common electrical failure mode — always confirm coil resistance with a multimeter before condemning the whole assembly. The intake line upstream of the unloader is fed from the air filter; downstream is the compressor air-end. A separate pilot signal from the receiver tank pushes against a diaphragm that sets the unload / load threshold; do not confuse this pilot line with the solenoid wiring.

• Confirm solenoid voltage rating on the data plate before energising (24 V DC vs 110 / 230 V AC)
• Use a DIN-style plug matched to the coil; seal the connector gasket to keep IP65
• Route the pilot line from the receiver tank, not the discharge line, to avoid setpoint drift
• Earth the body to the compressor frame to dissipate static and protect the coil
• Where the compressor controller is an Allen-Bradley or Siemens PLC, the load / unload output is normally a relay or DO module — verify the inrush current does not exceed the contact rating
• If the controller is an Omron SYSMAC or Schneider Modicon, capture a project backup before any setpoint change so the ladder logic is recoverable

Installation & Commissioning Tips

Replacement is straightforward, but the system must be fully depressurised and the compressor locked out before the existing unloader is removed — a typical 30 to 45 minute job for a technician with the right tooling. After installation, run the compressor through at least three full load / unload cycles and verify the setpoints on the controller before returning it to production service. If the controller is itself a programmable device (such as a Mitsubishi MELSEC, Omron SYSMAC, Schneider Modicon or Panasonic FP platform handling the compressor logic), keep a backup of the project file before any service work — setpoints are sometimes edited in the PLC program rather than on the local panel. Fault-code lookups for compressor controllers can also be cross-referenced in the PLC Error Code Database.

• Lock out and tag out the compressor; vent the receiver tank to atmospheric pressure
• Clean the intake flange and replace the gasket / O-ring on every change-out
• Torque the mounting bolts to the manufacturer spec; do not over-tighten the aluminium body
• Reconnect the pilot line and the solenoid plug; confirm the connector is fully seated
• Run three load / unload cycles and verify upper and lower pressure setpoints on the controller
• Listen for air leaks at the flange during a loaded run — any hiss indicates a seating issue
• Cross-check the controller setpoint with a calibrated gauge on the receiver, not the local panel only

Procurement, Warranty & Lead Time

The 1622348981 is held in stock and ships with the standard KOEED warranty terms against manufacturing defects under normal operating conditions (see the Return Policy for the full terms). Pricing follows the standard KOEED BOM quotation model — there is no fixed list price, and we quote against quantity, voltage variant and destination. Single-unit emergency orders are dispatched within 24–48 hours on business days from our Hong Kong / Shenzhen dual-base warehouse; bulk fleet orders are scheduled against the customer's maintenance window. Worldwide shipping is by DHL, FedEx or UPS with full tracking, and all shipments include a commercial invoice and packing list suitable for customs clearance.

To request a quote, send the part number and quantity to Moritta@KOEED.COM, or use the Create a Quote form for a multi-line BOM. Our sourcing team typically replies within one business day with availability, lead time and a formal quotation. If the 1622348981 is one line in a larger maintenance BOM that also includes Fanuc CNC spares, Yaskawa servo drives, Panasonic PLCs, Mitsubishi drives or KEYENCE vision hardware, send the whole list and we will quote it as a single shipment. Engineers on night shift can also use the AI Diagnostic Tool for 24/7 part identification and obsolescence advice.

See recent shipments and field photos in the Real-Time Records page, and follow the Daily PLC News blog for compressor-room best-practice notes. For logistics terms see the Shipping Policy. To learn how KOEED extends multi-brand sourcing beyond the nine core automation brands, see About China Sourcing Company, the About KOEED page, and the Our Gallery. Any other questions, including wholesale accounts and dealer enquiries, can be sent to Moritta@KOEED.COM or through the Contact Us form.