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Model NO.: DW335
Media: Water
Thread Standard: ISO228, ISO7/1
Trademark: DW or OEM
Transport Package: Polybag, Inner Box, Carton, and Wooden Pallets
Specification: 1/2′′-2′′
Origin: China
HS Code: 8481804090
Description:
1. Pressure tested according to ISO 5208 standards
2. Body material: Bronze
3. Disc options: Brass disc with silicon rubber seals or ABS disc with NBR seals
4. Size range: 3/8'' - 3''
5. Thread standards: ISO7/1, ISO228, NPT, DIN2999
6. Packaging: Each valve is individually packed in a polybag, then placed in an inner box, and finally packed in cartons on wooden pallets.

Technical Specification:
Working Pressure 1.6 MPa
Tested Pressure: 2.0 MPa
Working Medium: Water, non-corrosive liquids (excluding oil), and saturated steam
Working Temperature: -20°C ≤ T ≤ 150°C

En10226 1/2

Function:
A check valve is an automatic valve designed to prevent backflow of the media, protect pumps and motors from reverse rotation, and release medium from containers. It can also be used in pipelines where pressure may rise above system pressure, acting as an auxiliary supply.

Classification:
Check valves are classified based on their structure and installation method:

1. Swing Check Valve: The disc rotates around the seat axis, offering lower flow resistance compared to lift check valves. It is suitable for low flow rates and large diameters but not for pulsating flows. It comes in single-disc, double-disc, or multi-disc designs to prevent flow stoppage or backflow and reduce hydraulic shock.

2. Lift Check Valve: The disc moves vertically along the body axis, typically installed in horizontal pipelines. High-pressure, small-diameter versions use a ball-type disc. These valves resemble globe valves in design, resulting in higher flow resistance. They have guided sleeves that allow the disc to move freely. When media flows downstream, the disc opens; when flow stops, it closes automatically to prevent backwash.

Check valves operate automatically using media flow to open and close the disc, preventing backflow. They are also known as one-way valves, reflux valves, or back pressure valves.

FAQ:

1. What is your payment term?
A: We accept T/T with 30% deposit and 70% before delivery. We will send you photos of the products and packaging before the final payment.

2. What is your delivery time?
A: Typically 15–30 days, depending on the order quantity and our inventory levels.

3. Can I get free samples?
A: Yes, please provide your address, phone number, postal code, and express account. Let us know which samples you need and their specifications.

4. Can you produce products with my own brand?
A: Yes, we offer OEM services.

Our Company:
Ningbo Doway M&E Co., Ltd. was established in 2000 in Ningbo, China. We specialize in manufacturing brass and bronze valves, fittings, water meter accessories, and pipe fittings. Our product range includes ball valves, angle valves, gate valves, check valves, bib cocks, marine valves, PPR inserts, radiator valves, camlock couplings, and grooved couplings. We also engage in brass forging, investment casting, sand casting, and gravity casting. Our products are widely used in water and plumbing systems and are well recognized in Europe, the USA, the Middle East, and other regions due to competitive pricing, high-quality products, and excellent service. We have obtained ISO9001 certification and CE approval for our ball valves, as well as UL approval for our bronze ball valves. Based on the principles of "Honesty, Pragmatism, and Innovation," we maintain a professional team dedicated to providing competitive prices, quality products, and timely delivery. We also offer strong OEM and ODM capabilities to meet customer needs for various brass and bronze valves and fittings for water solutions. Ningbo Doway M&E Co., Ltd. is committed to being a reliable partner in the water plumbing industry and aims to deliver value to our customers. Feel free to contact us for more information about how we can support your sourcing operations.

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