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How Bendix AD-9 Air Dryers Work

Bendix AD-9 Air Drying Process

The information on this page describes how the Bendix AD-9 functions during normal operation. You should see our AD-9 troubleshooting information or download the Bendix AD-9 Service Data Sheet if you’re trying to diagnose a problem with your air dryer. We also sell new AD-9s as well as AD-9 service parts.

060-065225_200

OVERVIEW

Every truck with air brakes has an air compressor on the engine. The air compressor keeps the air tanks full, so there is always air available to stop the truck. All air has a certain level of humidity which means that there is always water vapor in the atmosphere no matter if you’re in a dry or damp climate. Air is heated as it’s compressed, and it cools as it travels through the discharge line to the air tank. This cooling results in condensation creating pools of water in the bottom of the truck’s air tanks. You will also find oil from the compressor and any contaminants that made it through the compressors air filter in the the water.

Air dryers were created to minimize the amount of moisture and other contaminants that make it to the air tanks. The Bendix AD-9 air dryer alternates between two modes or “cycles” during use, the charge cycle and the purge cycle. Both cycles play an important part in keeping your air tanks as clean as possible.

AD-9 CHARGE CYCLE

With an AD-9 air dryer installed, contaminants enter the supply port of the air dryer end cover. As the compressed air travels through the end cover assembly, its direction of flow changes several times causing contaminants to condense and drop to the bottom of the air dryer end cover.

The compressed air exits the end cover and flows into the desiccant cartridge where it flows through an oil separator that removes any water as well as oil and solid contaminants. The air then leaves the oil separator and enters the desiccant drying column. The moist air flowing through the column of desiccant becomes progressively drier as the water vapor absorbs into the desiccant material. The desiccant cartridge removes 95% of the water vapor from the pressurized air.

Most of the dry air exits the desiccant cartridge through a built-in single check valve and fills the purge volume 060-AD9-Cross-Section

between the desiccant cartridge and outer shell. Some air exits the desiccant cartridge through the purge orifice near the check valve.

The dry air is then moved out of the purge volume through the single check valve and out the delivery port to the first (supply) reservoir of the air system. The air dryer stays in the charge cycle until the air brake system pressure reaches the governor cutout setting.

 

AD-9 PURGE CYCLE

The purge cycle of the air dryer begins when the governor causes the compressor to unload (stop compressing air). During compressor unload, the line connecting the governor unloader port to the AD-9 air dryer end cover control port is pressurized. The air pressure causes the air dryer purge valve to open. Contaminants in the end cover sump are expelled immediately when the purge valve opens. At the same time, the air that was traveling through the desiccant cartridge reverses direction and begins to flow to the open purge valve removing oil and solid contaminants collected by the oil separator.

The initial purge and desiccant cartridge decompression happens in just a few seconds and is evidenced by a burst of air at the AD-9 air dryer exhaust.

The flow of dry air through the desiccant cartridge drying bed reactivates the desiccant material by removing the water vapor it previously absorbed. It normally takes 15-30 seconds for the entire purge volume to flow through the desiccant drying bed.

The single check valve in the AD-9 end cover keeps air pressure in the brake system from blowing back into the air dryer during the purge cycle.

The purge valve will not close until air brake system pressure is reduced and the governor signals the compressor to begin compressing air again. That will start the next charge cycle.

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Ordering a SKF Turbo-2000 air dryer and SKF Service Parts / Repair Kits

The Turbo-2000 is an excellent choice for severe service, stop-and-go operation. It features a large purge volume to desiccant ratio that results in ideal filtering and contamination prevention. Turbo-2000 can be used with compressors up to 30 CFM with duty cycles as high as 40%.

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Ordering a SKF Turbo-2000 air dryer

We sell all SKF dryers as non-returnable special orders. Call or email us with your requirements, and we will get you the current price and availability.

Turbo-2000 Service Parts / Repair Kits

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Ordering a Haldex Pure Air Plus air dryer

Pure Air Plus are usually found on coach chassis from the 1990s. Haldex is no longer producing new Pure Air Plus dryers, but remanufactured units are still available.

Ordering a Pure Air Plus air dryer

We sell all Pure Air Plus dryers as non-returnable special orders. We’ll need a part number from your existing air dryer or the vehicle manufacturer’s part number in order to determine the current Haldex aftermarket part number. The part number on your existing air dryer will usually start with a ‘N’ followed by numbers and maybe another letter, such as N4250 or N4250C.

1.Haldex DA33100X 12-Volt Pure Air Plus Air Dryer, No Bracke

070-DA33100

  1. Manufacturer: Haldex
  2. Part Number: DA33100X
  3. Condition: Remanufactured, Core charge required
  4. Pure Air Plus air dryer
  5. For use in standard air -brake applications on truck, tractors, and buses
  6. 12 volt DC heater
  7. Supply Port: 1/2″ NPT
  8. Delivery Port: 1/2″ NPT

Core Charges
This item carries a core charge that is fully refundable with the return of your rebuildable Haldex core. It MUST be a Haldex brand Pure Air Plus core. You will need to ship your core freight prepaid to the address on your receipt. Include a copy of your receipt, so we can apply your core refund to the proper order.

Cross References: DA33100, N4250, N4250C, N4250C, N4250D, N4250E, N4250F, N4250H, N4250K, N4250N, N4250P, N4250R, N4250R, ZZDA33100, 201644C91, 2016744C91, 2016744C92, 767653009377
A cross reference listing means that this air dryer is a suitable replacement for the part numbers listed. Some changes in plumbing and/or installation may be required.

  1. This air dryer is NOT compatible with Cummins Holset compressors
  2. Does NOT include new mounting bracket

Haldex Pure Air Plus Repair Kits

A.Haldex DQ6011 12-Volt Heater Kit for Pure Air Plus Air Dryers, Dryers Dated Prior To 09/1997

070-DQ6011

Manufacturer: Haldex

Part Number: DQ601112-

Voltheater kit for Pure Air Plus air dryers

For dryers date coded prior to 9/97

Fits the following Pure Air Plus models: DA33100, DA33100X, DA33100BX, DA33140, DA33140X, DA33200, DA33200X, DA33240, DA33240X

 b.Haldex DQ6020 Lower Housing Repair Kit for Pure Air Plus Air Dryers
070-DQ6020
Manufacturer: Haldex
Part Number: DQ6020
Lower housing repair kit for
Pure Air Plus air dryersIncludes purge valve, turbo saver, and one-way check valve assemlies
Fits the following
Pure Air Plus models: DA33100, DA33100X, DA33100BX, DA33110, DA33110X, DA33140, DA33140X, DA33200, DA33200X, DA33240, DA33240X, DA33105

C:Haldex DQ6026 General Service Kit for Pure Air Plus Air Dryers, Includes Desiccant Cartridge

070-DQ6026

Manufacturer: Haldex
Part Number: DQ6026
General service kit for Pure Air Plus air dryers
Includes desiccant cartridge, coalescing filter, relief valve, purge shield, and associated hardware
Fits the following Pure Air Plus models: DA33100, DA33100X, DA33100BX, DA33110, DA33110X, DA33140, DA33140X, DA33200, DA33200X, DA33240, DA33240X, DA33105

Cross References: DQ6022, DQ6036, DA33120, 201160C
A cross reference listing means that this part should be a suitable replacement for the part numbers listed.

Other size:

 

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Ordering a Haldex “Pure Air” air dryer

Pure Air air dryers are an older dryer model that is still found on the road today. They can be mounted horizontally or vertically, and they are serviceable from either end.

Ordering a Pure Air air dryer

We sell all Pure Air dryers as non-returnable special orders. We’ll need a part number from your existing air dryer or the vehicle manufacturer’s part number in order to determine the current Haldex aftermarket part number. The part number on your existing air dryer will usually start with a ‘N’ followed by numbers and maybe another letter, such as N4244 or N4244A.

Haldex Product:
1.Haldex KN33000 12-Volt ‘Pure Air’ Air Dryer, Standard Size, OEM# N4244
2.Haldex KN33010 24-Volt ‘Pure Air’ Air Dryer, Standard Size, OEM# N4244A

070-KN33000

Product Description
Manufacturer: Haldex
Part Number: KN33000,KN33010
OEM Number: N4244,N4244A
Condition: New
“Pure Air” air dryer
New air dryer, no core charge
For use in standard air -brake applications on truck, tractors, and buses
12 volt DC heater/24 volt DC heater
Supply Port: 1/2″ NPT
Delivery Port: 1/2″ NPT
Cross References: ZZKN33000X, F4HS2A131BA, N4244
A cross reference listing means that this air dryer is a suitable replacement for the part numbers listed. Some changes in plumbing and/or installation may be required.
Special Notes:This air dryer is NOT compatible with Cummins Holset compressors

2.Haldex Pure Air air dryer kit:
Midland Haldex Pure Air Air Dryer Major Maintenance Kit

070-RN60A

Manufacturer: Haldex
Part Number: RN60A
Major service kit for Midland/Haldex Pure Air air dryers
Includes desiccant bag, filter, o-rings, check valve seal, and purge valve seal
Cross References: RN60A, 5396-RN60A, 1645921C91, 86130027, 767653020242, MIDRN60A

Other size:

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Ordering a Haldex DRYest air dryer and Kit

DRYest air dryers integrate the turbo protection valve, governor, regeneration valve, muffler, and heater into one compact package to ensure extended system life with lower initial costs. It fits in an area as small as 12″ x 6-3/4″ x 6-3/4″.

  1. Haldex 47178964 DRYest Air Dryer Desiccant Cartridge Kit

    070-47178964070-Dryest

  2. Manufacturer: HaldexPart
    Number: 47178964
    Condition: New
    Desiccant cartridge kit for Midland Haldex DRYest air dryers
    mounting bolts, o-ring, bolt anti-seize, and installation instructions
    Fits the following DRYest models: DA35100, DA35105, DA35110, DA35115, DA35200, DA35205, DA35210, DA35215, DA35220
Ordering a DRYest air dryer

We sell all DRYest air dryers as non-returnable special orders. We’ll need a part number from your existing air dryer or the vehicle manufacturer’s part number in order to determine the current Haldex aftermarket part number. The part number on your existing air dryer will usually start with a ‘N’ followed by numbers and maybe another letter, such as N4260 or N4260A. Please call or email us with that information in order to get the latest pricing and availability.

Other size:

 

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Terms of Sale

Terms of Sale:

Terms of sale are NET 30 DAYS. On all open accounts, a 1% service charge on the unpaid balance will be assessed for every succeeding month until the account becomes current. If the account exceeds the open account limit as determined by TINMY, Inc’s financial department, all shipments will be held until the account is within standard terms or shipments are made on a COD basis.

Freight Terms:

All purchases will be shipped F.O.B. Irwin, PA, except where otherwise negotiated by TINMY’s Inside Sales Representatives.

Minimum Order:

$100 Rep Net Minimum per order.

Returns:

TINMY manufactures to order. Goods may not be returned for any reason without approval by TINMY, Inc. and without being accompanied by a Return Material Authorization (RMA) and under the following conditions: (a) Where the goods shipped by TINMY (I) do not conform to the description of the goods in the TINMY contract of sale, (ii) included a defect in material or workmanship at the time of shipment or (iii) otherwise do not fulfill TINMY’s obligations under the contract. (b) Where the goods (I) are returned to TINMY within 30 days after TINMY’s original shipment of the goods,(ii) are not specially ordered items, (iii) are in their new and unused condition and (iv) are identified by their original sales order number. TINMY will bear all freight charges on returns covered by paragraph (a) above. Customer will bear all freight charges resulting from returns covered by paragraph (b) above, and all returns to which paragraph (b) above is applicable will be subject to a restocking charge of 25% of the price which the customer paid to TINMY for the standard goods returned. Additional restocking charges will apply to polished valves and automation and accessories. Under no circumstances is overstocking by a representative or customer a valid reason for return of any item. Return Material Authorizations are valid for a period of (90) days from issue and are void and unusable at the end of this period. Thecustomer is responsible for assuring that proper packaging protects the valves in new and reusable condition. Any damage resulting from improper packaging will be accessed by TINMY and added to the restocking charge.

Warranty:

TINMY, Inc. warrants it’s products against defects in material and workmanship when used in those applications approved by TINMY, for a period of one (1) year from the date of original shipment by TINMY. TINMY’s liability under it’s warranty shall be limited to repair or replacement, at TINMY’s option, of such defective products, F.O.B. factory.

Limitation of Liability:

Customer acknowledges and agrees that TINMY’s sole responsibility or liability in the case of any breach of the foregoing warranty, shall be for TINMY, at TINMY’s election, to repair or to provide a replacement for the product or portion thereof with respect to which such warranty contract is breached or to return all payments made by customer with respect to such product or portion thereof.

Responsibility:

Any product claimed to be defective must by returned by Customer prepaid for inspection. Items showing abusive or improper use, used for purposes other than intended or having been altered in any manner will not be repaired or replaced except at the expense of the Customer. Products found to be defective by our examination will be repaired or replaced at no expense to the user if such is through our omission or error.

Damage in Transit:

All items are carefully packed when leaving our plant and we cannot be responsible for damage after shipment has been delivered to the carrier. All claims for damaged or lost merchandise should by made to the carrier.

Cancellations:

Orders for standard inventoried products are subject to a cancellation charge of 10% to reimburse TINMY, Inc. for costs incurred. This charge will be levied on all orders canceled after seven (7) calendar days from order entry. Orders for non-standard or special valves or components, including resale items, are not subject to cancellation after such order has been acknowledged to Customer or end user. Any exceptions to this clause must appear in written agreement prior to placement of order.

Disclaimer:

Due to continuous product improvements, TINMY, Inc. reserves the right to modify or change design without incurring any liability to furnish or install such modifications or changes on products previously or subsequently sold.

Prices:

TINMY Inc. reserves the right to change published prices and other terms and conditions of sale without prior notice.

Rush Orders:

Orders requesting shipment of valve spare parts within 24 hours, or valve assemblies within 48 hours, of receipt of order by TINMY, Inc. may be charged 10% over the net prices otherwise applicable.

Delivery Schedule:

Shipment shall be made by TINMY in accordance with TINMY’s normal delivery schedule.

Field Service Charges:

Upon the Customer’s specific request to TINMY, TINMY will provide the services of a field service representative. Except where the necessity for the services of the field service representative results solely from acts or omissions for which TINMY is responsible, Customer will pay for such field services at TINMY’s current prevailing daily field service rate plus all expenses incurred by the filed service representative.

Export Compliance:

“Buyer acknowledges that the products received from seller are subject to U.S. Export Administration Regulations, as amended, and other applicable laws and related regulations (collectively “regulations”). Buyer hereby gives assurance, with respect to the products and any U.S. Origin technical data, that Buyer shall comply with the Regulations.”

  • TINMYreserves the right to substitute TFM™ material for other seat/seal materials at our discretion.
  • TINMYreserves the right to impregnate Bronze castings as needed to address porosity issues. It is the customers’ responsibility to advise in advance if this is not acceptable.
  • Suitability and/or Performance of Product – Seller makes no warranties, expressed or implied, regarding suitability or performance of the product offered. Buyer agrees to review all technical data and make final determination as to the suitability of the product for the intended end-use application. If technical data has not been provided and is required to determine suitability, it is the customer’s responsibility to request, obtain and review all pertinent documentation.