• 1PCS FOR QG-40 QG-40B QG-50 Air compressor Servo loading cylinder inlet valve - KOEED [1]
1 1

KOEED

QG-40/QG-40B/QG-50 Air Compressor Servo Loading Cylinder Inlet Valve

QG-40/QG-40B/QG-50 Air Compressor Servo Loading Cylinder Inlet Valve

$149.42 USD
$149.42 USD $149.42 USD
Sale Ausverkauft
Versand wird beim Checkout berechnet
MPN QG-40/QG-50/QG-40B
function Controls the compressor
material Not specified
size QG-40, 40B, 50
type Air Compressor
Chat on WhatsApp
Vollständige Details anzeigen

  • step 1: Quote Or Shop Now

    You can place an order directly or contact us via email and whatsapp for a quote

  • step 2: Confirmation and delivery

    After placing an order, we will contact you by email or WhatsApp within three days to provide photos and videos of the product for confirmation and then ship it.

Customers are saying

4.99 ★ (1084)
Verified

Description


QG-40/QG-40B/QG-50 Air Compressor Servo Loading Cylinder Inlet Valve

Professional air compressor control for industrial applications.

The product is a PLC industry-specific air compressor inlet valve featuring a servo cylinder for precise control. It is designed for industrial applications and ensures efficient operation. The QG-40/QG-40B/QG-50 model provides reliable performance with customizable settings.

Engineer's Quick Brief

  • Optimized Load/Unload Control: The QG-40 and QG-50 series inlet valves utilize a precision pneumatic servo cylinder to swiftly transition rotary screw compressors between loaded (compressing) and unloaded (idling) states, minimizing energy waste.
  • Integrated Anti-Blowback System: Features a robust internal check valve (non-return valve) that instantly seals upon shutdown or power loss, preventing compressed air and lubricating oil from spitting back through the air filter.
  • Direct Replacement Match: Designed with standard flange footprints for seamless integration into 30kW to 55kW (40HP - 75HP) industrial screw air compressors, ensuring rapid maintenance turnarounds.

QG-40 / QG-40B / QG-50 Servo Cylinder Inlet Valve

The QG-40, QG-40B, and QG-50 Servo Loading Inlet Valves are heavy-duty pneumatic suction controllers engineered specifically for rotary screw air compressors. Acting as the respiratory system of your compressor, this assembly determines exactly how much ambient air is allowed into the air-end. Driven by a highly responsive servo cylinder and typically paired with a normally-closed (NC) solenoid control system, it ensures your compressor only works when system pressure drops below the set threshold. Manufactured from high-density, corrosion-resistant cast aluminum, these valves provide durable, leak-free performance in continuous-duty manufacturing and industrial air plants.

Technical Specifications

Specification Parameter Detail / Value
Series Models QG-40 / QG-40B / QG-50
Compatible Compressor Type Oil-Injected Rotary Screw Air Compressors
Typical Power Match 30 kW to 55 kW (approx. 40 HP to 75 HP)
Actuation Mechanism Pneumatic Servo Cylinder (Control Air Actuated)
Standard Valve State Normally Closed (Opens on vacuum/control signal)
Working Pressure Range 0.5 MPa - 1.5 MPa (5 to 15 Bar)
Main Housing Material High-Strength Cast Aluminum Alloy
Integrated Safety Features Anti-blowback Check Valve, Internal Bleed/Vent Port

Industrial Application Matrix

  • Preventative Overhaul: Essential replacement component during the 8,000-hour major service interval for medium-sized rotary screw compressors.
  • Manufacturing Plants: Ensures stable pneumatic supply for CNC machining centers, robotic assembly lines, and industrial packaging equipment by maintaining precise load/unload cycles.
  • Air-End Protection: Acts as the primary physical barrier, preventing destructive reverse-rotation of the screw rotors during emergency stops.

Troubleshooting & Maintenance FAQ

Q: Why is oil spitting out of my compressor's air intake filter when it shuts down?
A: This is a classic symptom of a failed check valve within the inlet valve assembly. When the compressor stops, internal pressure forces air and oil backward. If the QG inlet valve's internal spring or sealing O-ring is worn, it fails to slam shut, causing "blowback". The entire valve or a comprehensive rebuild kit must be installed.

Q: The compressor is running, but it won't build pressure (fails to load). Is the inlet valve broken?
A: Possibly. If the servo loading cylinder is jammed due to moisture/rust, or if the control solenoid valve supplying air to the servo cylinder has failed, the inlet valve will remain closed. Check the control air line and ensure the solenoid is receiving the correct voltage before condemning the physical valve.

Q: What is the difference between the QG-40 and QG-50 models?
A: The primary difference lies in the internal bore size and the mounting flange diameter. The QG-50 allows for a higher volumetric flow rate (CFM/m³/min), making it suitable for larger air ends (e.g., 55kW/75HP machines), whereas the QG-40 is typically used on 30kW-37kW units. Always measure your existing bolt hole pitch before ordering.

Cross-Reference Guide

System Compatibility Widely compatible with Chinese and international generic air ends (e.g., Baosi, Hanbell, Rotorcomp) utilizing standard flange footprints.
Functional Category Pneumatic Suction Controller / Unloader Valve Assembly
Related Maintenance Parts Minimum Pressure Valve (MPV), Load Solenoid Valve (220V/24V), Thermostatic Valve Kits.

About Koeed Automation

Expert Supply Solutions for Global Industrial Electronics

At Koeed.com, we are professional architects of the industrial electronics supply chain. We specialize in providing high-performance PLCs, HMIs, Servo Motors, Drives, and Converters to ensure that modern manufacturing operations remain efficient, reliable, and future-proof in 2026’s competitive landscape.

🛡️ Certified Quality

We source only 100% authentic industrial hardware from global category leaders. Every component undergoes a rigorous verification process to meet Industry 4.0 reliability standards.

⚙️ Engineering Domain

Our experts provide more than just parts; we offer technical insight. We assist in complex product selection and compatibility audits for both legacy system upgrades and new installations.

🌐 Rapid Global Logistics

Time is money in industrial automation. Our optimized supply network ensures that critical components reach your facility quickly, significantly reducing unplanned downtime and operational loss.

Strategic Global Portfolio: Siemens, Omron, FANUC, Schneider Electric, Mitsubishi, Yaskawa, Allen-Bradley, and other elite industrial brands.

Supporting your vision for a smarter, more efficient industrial future.

Alternative Names


  • QG-40
  • QG-40B
  • QG-50

Special Reminder

Important

If you have any questions about product information and prices, please feel free to contact us by email or WhatsApp. We will respond quickly.

  • Business Days Only (Monday through Saturday)
  • It takes up to 10 days from the time of ordering (excluding Saturdays and Sundays) to the time of delivery to your designated location. Worldwide delivery.
  • Within 3 days after placing the order, we will send you photos and videos of the product via email or WhatsApp for confirmation

International shipping - items may be subject to customs processing depending on the item's customs value.
Sellers declare the item's customs value and must comply with customs declaration laws.
As the buyer, you should be aware of possible:

  • Delays from customs inspection.
  • Import duties and taxes which buyers must pay.
  • Brokerage fees payable at the point of delivery.

Shipping Policy

Global Delivery

We ship to customers all over the world. Our primary logistics providers are DHL, UPS, TNT, FedEx, and EMS.

Processing Time

All orders are processed within 72 hours of purchase. Please note that this applies to business days only.

Shipping Rates & Delivery Estimates

Shipping charges for your order will be calculated and displayed at checkout. Delivery estimates are within 7-14 days. Please note that these shipping times are only estimates and unfortunately, cannot be guaranteed.

Shipment Confirmation & Order Tracking

You will receive a Shipment Confirmation email once your order has shipped containing your tracking number(s). The tracking number will be active within 24 hours.

Customs, Duties, and Taxes

Please note, international shipping services do vary from country to country. To find out the exact services that are available, please put in your full address at checkout. Shipping internationally does mean that you may be required to pay customs and import taxes. All international customers are responsible for the customs rates within their own country. For further information, we recommend contacting your local customs office.

Damages

We take every reasonable precaution to ensure that products are not damaged. If the item is damaged in transit, please immediately contact us. We are not liable for any products damaged or lost during shipping. If you received your order damaged, please contact the shipment carrier to file a claim. Please save all packaging materials and damaged goods before filing a claim.

Force Majeure

When encountering with force majeure, the processing of orders will be delayed. Nevertheless, it is ensured that your order will be processed in a fast manner when weather permits.

Address Verification

Please verify you have the correct shipping address on your order PRIOR to making payment as this is the address we will ship to.

Return Policy

For more information, visit our Return Policy page.

International shipping - items may be subject to customs processing depending on the item's customs value.

Sellers declare the item's customs value and must comply with customs declaration laws.
As the buyer, you should be aware of possible:
• Delays from customs inspection.
• Import duties and taxes which buyers must pay.
• Brokerage fees payable at the point of delivery.

Contact Us

If you have any questions about your order, please contact us at moritta@koeed.com.

Return Policy

Return and Refund Policy

We want you to be completely satisfied with your purchase on our store. If for any reason you are not entirely satisfied, we're here to help!

Returns

You have a generous 30 calendar days to return an item from the date you received it. To be eligible for a return, ensure the item is in its original, unworn, and unused condition with tags and packaging intact. Retain your receipt or proof of purchase for eligibility. Please note that certain items are non-returnable like perishables, custom products, personal care goods, hazardous materials, flammable liquids, and gases. Reach out for clarifications on specific items.

Return Process

Commence the return process by reaching out to us at moritta@koeed.com. Upon approval, we will furnish you with a return shipping label and detailed instructions for dispatching your package. Unnotified returns will not be accepted.

Damages and Issues

Kindly review your order upon delivery. Notify us promptly if it arrives defective, damaged, or incorrect. We will address the matter swiftly.

Exchanges

Facilitate a swift exchange by returning the original item once approved and making a new purchase.

EU 14-Day Cooling Off Period

EU-bound shipments allow a 14-day cancellation or return period without justification. Conditions mirror standard returns.

Refunds

Upon receiving and inspecting your return, we’ll inform you of the refund status. Approved refunds are automatically processed within 10 business days via the initial payment method. Allow time for financial institutions to finalize the refund. For delays exceeding 15 business days post-approval, contact us at moritta@koeed.com.

Shipping

You will be responsible for paying for your own shipping costs for returning your item. Shipping costs are non-refundable. If you receive a refund, the cost of return shipping will be deducted from your refund.

Contact Us

If you have any questions on how to return your item to us, feel free to contact us at moritta@koeed.com.

Related manufacturers