This A0001407878 pressure‑relief valve assembly serves as the vital regulating fitting of the truck SCR exhaust‑gas treatment urea pump. It stabilizes internal urea working pressure, prevents excessive system pressure‑build‑up and stops urea liquid crystallization and pump block‑down during long‑haul transportation. Our aftermarket repair kit strictly follows original‑equipment dimensional benchmarks. Every built‑in diaphragm, sealing ring and filter mesh undergoes anti‑crystallization and pressure‑resistant screening. Replacing the worn‑out relief valve helps your AdBlue pump maintain steady urea delivery, cut down SCR‑system breakdown risks and keep heavy‑duty vehicles compliant with Euro‑6 emission requirements. It is an economical replacement spare for routine urea‑pump overhaul.
Item No :
A0001407878 Urea PumpOrder(MOQ) :
1Payment :
T/TProduct Origin :
CHINAShipping Port :
SHANGHAI GUANGZHOU NINGBOProduct Material:
The main valve shell adopts high‑strength cast‑alloy metal for outstanding compression resistance. The core pressure‑sensing diaphragm is made of specially‑formulated urea‑resistant synthetic rubber that resists urea crystal erosion and rubber ageing. Food‑grade fluororubber O‑rings serve as sealing pieces, and the built‑in filter screen uses anti‑corrosion stainless‑steel woven mesh for intercepting tiny sediment particles inside urea fluid.
Product Advantages:
Matches the OE specification of part number A0001407878 for direct installation with no modification work
Wear‑proof rubber diaphragm withstands frequent pressure fluctuation and long‑time urea‑liquid soaking
Built‑in fine stainless‑steel mesh filters impurities and lowers the chance of valve core jamming from urea sediment
Reliable pressure‑release performance stabilizes the working pressure of the AdBlue pump and protects expensive SCR pump hardware
Complete accessory package contains all essential gaskets and fittings for one‑step maintenance
Cost‑efficient repair solution, prevents whole urea‑pump replacement and greatly cuts your heavy‑truck maintenance expenditure
Instructions For Use:
Turn off the truck engine and engage the parking brake. Wait for the SCR urea‑pump assembly to fully cool down.
Disconnect the power connector and urea pipeline attached on your AdBlue pump, drain the leftover urea liquid safely.
Unfasten the fasteners of the old pressure‑relief valve and detach the worn‑out original unit.
Clear away urea sediment and dirt around the mounting seat, then fit the brand‑new A0001407878 relief‑valve kit and fasten screws to proper torque.
Re‑attach urea pipelines and electric plugs, then run the vehicle self‑inspection programme to check for liquid leakage and normal pressure output.
Inspect the relief valve status every 30,000 kilometres, carry‑out timely replacement once you discover urea leakage or unstable pump pressure.
product information:
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OE |
A0001407878 |
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Filter type |
Urea pump |
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Cross-reference |
A0001405478 A055T285 A0001408178 A051E527 A0001405778 1403378 A0001405978 A0001403978 A0001402728 |
our service
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OEM Support: Customized products and packaging solutions can be provided. |
Sample Order: We welcome orders for samples for testing. |
Quick response: We will reply to your inquiry within 24 hours. |
Payment methods: Wire transfer, PayPal, Alipay. |
Sample delivery: 3 - 15 days.
Order delivery time: 20-30 working days, depending on the quantity.
Transportation method: Sea freight, air freight or express delivery.
Please conduct the test immediately after receiving the product. If you encounter any problems, please contact us.

Frequently Asked Questions
Question: How is the quality of your products?
A. Our advanced machinery and materials guarantee outstanding performance and craftsmanship.
B. Customized materials and standards can be provided to meet specific market demands.
Question: What is the payment method?
Letter of Credit, Telegraphic Transfer, Documents against Payment, PayPal, Western Union Money Transfer, Small Payment, MoneyGram.
Question: Do you offer samples?
Yes, samples can be provided (either free of charge or at a fee, depending on the product); the shipping cost is borne by the buyer.
Question: What packaging options are available?
A. Customized Packaging
B. White or natural packaging
C. Color Box Options
Question: How long is the delivery time?
A. Generally, it takes 15 to 30 days.
B. Spot goods: Shipment will be made within 7 days after payment.
Question: What are the loading ports?
Guangzhou Port, Ningbo Port and Shanghai Port.
Question: What are the transportation methods?
A. Oceans, skies and land.
B. In cases where there are multiple sources of supply in China, we can assist in coordinating with the freight forwarders to integrate your goods transportation.
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