KAG Series Pneumatic zero air-loss drain

The KIMAIR KAG Series is a pneumatic, zero air-loss automatic condensate drain specifically designed for compressed air system components such as filters, refrigerated air dryers, and air receiver tanks. The series utilizes a unique float-operated liquid level control principle, enabling "on-demand draining" based on the actual volume of condensate produced—draining only water, not air, fundamentally eliminating compressed air waste. The KAG Series requires no electrical power and can be safely used in hazardous environments such as flammable or explosive areas. It is the ideal auxiliary equipment for energy-saving, safe, and reliable compressor stations and piping networks.

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Air Compressor Maintenance & Service Solutions

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| Product Details

Video Tutorial

KAG Series Pneumatic zero air-loss drain Principle Explanation Video

KIMAIR Core Advantages

True Zero Air-Loss Design

- No compressed air leakage during the draining process, perfectly meeting energy-saving and environmental protection requirements.
Pneumatic Control, No Power Required

- Fully driven by the system's own pressure, intrinsically safe, suitable for explosion-proof areas and outdoor environments.
Intelligent On-Demand Draining

- Automatically opens and closes based on the actual amount of condensate produced, avoiding unnecessary discharge and improving efficiency.
Large-Bore Drain Valve, Anti-Clogging Design

- Equipped with a stainless steel strainer (external or internal) at the inlet to effectively intercept impurities, ensuring long-term reliable operation.
Visual Status Monitoring (Models A/B)

- Semi-transparent composite material housing allows real-time observation of condensate level changes, facilitating easy inspection.
High Reliability & Long Service Life

- Rigorously tested and qualified through four major tests (pressure test, flow test, debris test, and life test), ensuring stable operation under demanding conditions.
Strong Environmental Adaptability

- Operating pressure range 0-1.6 MPa, medium/ambient temperature 1-60°C. An optional heating element is available to solve low-temperature freezing issues.
Expandable Special Versions

- Custom models available for higher pressure, larger drainage capacity, etc., fully replacing imported products.

Technical Parameters

Parameter	KAG-20	KAG-20A	KAG-20B
Product Features	①Zero air-loss No power required	①Zero air-loss ②No power required ③Visible condensate water	①Zero air-loss ②No power required ③Visible condensate water
Applications	Filter, refrigeration dryer, air tank	Slightly clear condensate	Slightly clear condensate
Rated working pressure	0‑1.6 MPa	0‑1.6 MPa	0‑1.6 MPa
Ultimate discharge volume	85 L/h (0.3 MPa) 135 L/h (0.8 MPa)	85 L/h (0.3 MPa) 135 L/h (0.8 MPa)	85 L/h (0.3 MPa) 135 L/h (0.8 MPa)
Applicable media	Slightly clear condensate	Slightly clear condensate	Slightly clear condensate
Temperature of medium	1‑60℃	1‑60℃	1‑60℃
Temperature of ambient	1–60°C (Heating bar is optional for sub-zero temperature)	1–60°C (Heating bar is optional for sub-zero temperature)	1–60°C (Heating bar is optional for sub-zero temperature)
Inlet	3*G1/2"	G1/2"	G1/2"
Outlet	φ8 (G1/4”)	φ8 (G1/4”)	φ8 (G1/4”)
Port of air balance pipe	G1/2”	G1/4”	G1/4”
Type of discharge valve	Magnetic valve	Magnetic valve	Magnetic valve
Front mesh strainer of discharge valve	Yes (Outer set)	Yes (Inner set)	Yes (Inner set)
Materials of housing	Aluminum	Aluminum and translucent composite	Aluminum and translucent composite
Manual function	Yes	Yes	Yes
Protective class	IP68	IP68	IP68
Overall dimensions LWH (mm)	129×110×122	132×110×126	140×110×110
Net Weight	1.3 kg	1.8 kg	1.8 kg

Note: The above parameters may be subject to change due to product improvements without prior notice.

Applications

- Filter Bottom: Automatic condensate discharge from the bottom of precision filters and activated carbon filters.

- Refrigerated Air Dryer: Timely discharge of condensate from the precooler and evaporator side to prevent re-evaporation.

- Air Receiver Tank: Automatic draining of accumulated water at the bottom to keep the inside of the tank dry.

- Adsorption Dryer: Condensate discharge from the precooler and air-water separator.

- Explosive/Hazardous Areas: Petrochemical, chemical, natural gas, and other locations where power is not allowed.

- Outdoor/Unattended Stations: Can operate stably in cold regions when equipped with a heating element.

Customer FAQs

Q：Why can the KAG Series achieve "zero air-loss"?

A：Its unique pneumatic control principle ensures that a water seal is formed when the drain valve is closed. A small amount of residual condensate always remains in the storage tank, completely isolating the compressed air. When draining, only liquid is discharged, with no compressed air escaping. Tests confirm no gas leakage.

Q：What are the advantages compared to electronic timed drains?

A：Pneumatic drains are truly on-demand, operating based on the actual amount of condensate produced, rather than at fixed time intervals. Electronic timers may discharge unnecessarily (wasting compressed air) or fail to drain completely (affecting the system). The KAG Series requires no electrical power, is easy to install, and is particularly suitable for humid, dusty, or explosion-proof environments.

Q：How to handle low-temperature freezing issues?

A：When ambient temperatures may fall below 0°C, we offer an optional heating element that can be installed on the outside of the storage tank to maintain the internal temperature above freezing, ensuring the drain operates correctly in cold regions.

Q：Does fine debris in the condensate affect drainage?

A：The KAG Series is equipped with a stainless steel strainer at the inlet (external for KAG-20, internal for KAG-20A/B), which effectively intercepts larger particles and prevents clogging of the main valve. Regular inspection and cleaning of the strainer will ensure long-term reliable operation.

Q：How to manually test the drain function?

A：Each model is equipped with a manual test knob. Simply turn the knob to forcibly open the drain valve and verify that the drainage path is clear. This function is very useful during installation, commissioning, or routine inspections.

Q：What is the main difference between KAG-20A and KAG-20B?

A：Both have semi-transparent visible housings. The main difference lies in the pressure point for the maximum drainage capacity: KAG-20A reaches 135 L/h at 0.9 MPa, while KAG-20B reaches 135 L/h at 1.0 MPa. The equalizer connection size is also slightly different. Users can select the most suitable model based on their system's actual operating pressure.

Why Choose the KIMAIR KAG Series?

- Energy Saving & Safety Combined: Zero air-loss design directly reduces energy waste; pneumatic drive is intrinsically safe, suitable for explosion-proof areas.

- Adapts to Complex Conditions: Wide pressure range (0-1.6 MPa), medium temperature coverage (1-60°C), with options for heating elements, special strainers, and high-capacity special versions.

- Durable & Long-Lasting: Passed four rigorous tests (pressure, flow, debris, life). Key components use wear-resistant and corrosion-resistant materials.

- Easy Installation & Maintenance: Multiple connection ports, manual test function, simple strainer cleaning, reducing maintenance workload.

- International Certification Quality: IP68 protection rating, can replace similar imported products.