A double check valve backflow preventer uses two independently operating check valves (spring-loaded or poppet-style) to stop reverse flow. If the first check fails, the second provides backup. It's the most common type for low-to-medium hazard applications under ASSE 1015 and USC FCCCHR standards. At Thriveon, we design ours with splittable bodies for easy in-line maintenance.

Both prevent backflow, but the RPZ includes a pressure differential relief valve that discharges water if the zone pressure drops — offering higher protection for high-hazard fluids. Double check valves are suitable for potable water, irrigation, and non-toxic fluids. RPZ is required for chemical/biological hazards. We manufacture both; our team can help you choose the right assembly based on your local code.

Sizing depends on flow rate (GPM) and pipe diameter. A simple rule: match the valve size to your pipe diameter, but ensure flow velocity stays between 2–8 ft/s. For 100 GPM, a 2" valve works; for 400 GPM, go with 4". We provide sizing sheets and can do a free system review if you share your flow and pressure data. Submit a quick inquiry and we'll respond within 2 hours.

Yes — all our standard double check assemblies are certified to ASSE 1015, CSA B64, and USC FCCCHR. We also offer NSF 61 certification for potable water. Each valve is serialized and comes with a certified test report. 3rd-party testing via SGS or Intertek is available at cost.

Absolutely. We offer full OEM/ODM capabilities: custom flange drilling (ANSI, DIN, JIS), special trims (316SS, Monel, Hastelloy), different elastomers (EPDM, NBR, Viton), and threaded/grooved ends. Minimum custom order is 50 units. Lead time for custom runs: 30–45 days. Send us your spec sheet and we'll quote within 48 hours.

Standard lead time: 25 days CIF to Houston, Los Angeles, or Newark. Express air freight: 7 days (cost varies). Shipping cost for a 40' container (approx. 800 units of 2"–4" valves) to Houston is ~$3,800–$4,500 — much lower than domestic freight for equivalent volume. We handle all customs documentation; your cost is all-inclusive until port of entry.

We provide a 5-year warranty against manufacturing defects in materials and workmanship. Extended 7-year warranty available for large-volume contracts. In the unlikely event of a field failure, we ship a replacement immediately and handle the claim directly — no back-and-forth with distributors. Our failure rate is <0.3% as verified by 3rd-party audits.

Order process: Send inquiry → receive quote → approve proforma invoice → 30% deposit → production → final payment → shipment. We accept T/T wire transfer, L/C at sight, and for established relationships — net 30 terms (up to $50,000). We also accept PayPal for samples up to $1,000. Contact our sales team to get started.