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SMC Automatic Drain, AD402-04

LEHIY item code: LH-SMC-2139

Operating Temperature (°C): -5-60

Category: Automatic Drainage Unit

Operating Pressure Range (MPa) 0.1-1.0: 0.1-1.0

Quick buying check

This page helps you check SMC Automatic Drain, AD402-04 before you ask for a quote.

Confirm the brand, model number, part number, and quantity. Share a clear nameplate photo when the old item has close variants.

LEHIY can check stock, lead time, packing, shipping documents, and safe replacement options for maintenance orders.

Product Features



  1. Automatic drainage, no manual intervention required, reliable drainage.

  2. Dust resistant, rust resistant, accurate operation, with outer cover as standard equipment.

Product Details

  • Principle Explanation

    When there is no air pressure inside the water cup 10, the float 5 falls due to its own weight, and the lever mechanism 9 causes the pressure block 6 to close the upper throttling orifice.

    Piston 8 is pressed down by spring 11, the piston rod disengages from the O-ring, and condensate is discharged from the drain outlet through the elongated hole 12 in the chamber.
  • In cases of internal pressure in the water cup

    When the pressure inside the water cup exceeds 0.1 MPa, it exceeds the force of spring 11. Under the action of air pressure, piston 8 overcomes the spring force and rises, contacting O-ring 4. Thus, the drain outlet is sealed.

  • In cases of condensate retention

    When the condensate level in the water cup rises, float 5 rises, causing pressure block 6 to disengage from the upper throttling orifice. Pressure enters the upper chamber of piston. 8.

    The air pressure and spring force cause the piston to move downwards, and the retained condensate is discharged from the drain pipe 13.

Notices

  • Automatic drainers should be used under the following conditions; otherwise, they may malfunction.

    1) Air compressor power should be above 3.7kw;

    2) Operating pressure: AD402 should be above 0.1MPa, AD600 should be above 0.3MPa.

  • Automatic drainers should be piped according to the following conditions; otherwise, they may malfunction.

  • The inner diameter of the piping should be φ10mm or larger, and the length should be within 5m. The piping should not be vertically upward.

Technical Specifications

SpecificationValue
BrandSMC
CategoryAutomatic Drainage Unit
SeriesAD
Inlet Port Diameter (inch)Rc1/2
Drainage Port Diameter (inch)Rc3/8
Operating Pressure Range (MPa)0.1-1.0
Operating Temperature (°C)-5-60

Plain language sourcing guide for SMC Automatic Drain, AD402-04

Start with the full model name. Check the brand name. Check the part number. Check the code on the old unit. These small checks help you avoid a wrong order.

Take one clear photo of the front label. Take one photo of the side label. If the part has a cable, plug, port, seal, coil, or screen, take a photo of that area too.

Tell us the quantity you need. Tell us your country. Tell us the date when the plant needs the part. We can then check stock, lead time, safe packing, and the best shipping plan.

If the exact model is no longer made, do not guess. Send the old model and the use case. LEHIY can compare close options and explain which choice is safer for repair work.

Use simple order notes. Write the model in one line. Write the quantity in one line. Write the delivery country in one line. This helps our team reply faster.

Check the old part before removal. Look at the label. Look at the connector. Look at the mounting size. Look at the voltage or pressure rating if it is shown.

Do not rely on a short nickname for a part. Many industrial items have close versions. A small suffix can change the plug, output, range, or software setting.

Ask for a stock check if the plant is stopped. Ask for a lead time if the order is planned. Ask for packing photos if the part is fragile or heavy.

For a replacement order, tell us what failed. Tell us where the part is used. Tell us if an equal model is acceptable. This makes the first answer more useful.

For repeat orders, send the last invoice, old label, or old packing photo. The same reference can help us match the correct product again.

For urgent service, keep the message simple. One model, one quantity, one photo, and one delivery target are enough for a fast first check.

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Brand Name:SMCCertification:ISO9001, CE
Place of Origin:ChinaCondition:New
Warranty:1 yearCustomized sourcing:available

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Ans. LEHIY specializes in industrial automation and control components, offering fast sourcing, stable quality, and competitive prices for global customers.

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Ans. Most items ship within 3-7 days. Customized or rare models may take 10-30 working days.

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Ans. Our main products include PLCs, sensors, valves, solenoid valves, actuators, power modules, transmitters, and complete industrial automation solutions.

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Replacement support

SMC Automatic Drain, AD402-04

Send the brand, model, part number, quantity, nameplate photos, and application requirements. LEHIY will check availability, suitable alternatives, packing details, and delivery options before quoting.

For discontinued, temporarily unavailable, or configuration-sensitive items, our team can compare the requested model with close variants or compatible replacements for maintenance and spare parts planning.

Use this page as a practical sourcing note for engineers, buyers, and maintenance teams comparing automation components. Check the model name, brand, LEHIY code, application, and replacement requirements before sending an inquiry.

Short, clear information helps our team confirm availability faster and reduce back-and-forth communication during urgent maintenance projects.

  • Confirm the complete model number and any suffix printed on the nameplate.
  • Share quantity, destination country, preferred shipping method, and target delivery date.
  • Include photos, drawings, old purchase records, or datasheets when compatible alternatives are acceptable.
  • Ask for stock checking, replacement comparison, packing details, and export documentation before ordering.

Useful details for a faster quote

  • Complete model and part number
  • Required quantity and target delivery date
  • Nameplate photos, drawings, or old purchase records
  • Voltage, signal range, dimensions, or accessory needs
Send details

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Stock alternatives

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SMC Automatic Drain, AD402-04 verification notes

Please send the full model number, quantity, target delivery date, and nameplate photos. These details help us check the requested product or a close replacement.

LEHIY reviews product name, part number, series, label information, and application requirements before shipment.

If the original model is discontinued or supplied with different accessories, we can explain practical differences before quoting.

For repeat purchasing, we can help organize related models, replacement parts, shipment schedules, and clear communication for your team.

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