Eliminate cross-connection contamination risk, meet local code compliance, and reduce long-term maintenance costs — designed for commercial, industrial, and municipal water systems.
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A double check valve backflow preventer (DCVA) is a mechanical assembly consisting of two independently acting spring-loaded check valves, plus two isolation gate valves and test ports. Its primary purpose is to prevent contaminated or non-potable water from flowing backward into a potable water supply — a phenomenon called backflow caused by backpressure or backsiphonage.
Unlike a simple dual check valve (which offers no testability), a double check valve backflow preventer is a testable, code-compliant assembly used in commercial, industrial, and high-hazard residential applications. It is the most widely specified backflow prevention device for low-to-medium hazard cross-connections under the Uniform Plumbing Code (UPC) and International Plumbing Code (IPC).
For procurement managers and technical directors, choosing the right DCVA directly impacts code approval speed, long-term maintenance costs, and system reliability — especially when sourcing from global supply chains where quality variance is high.
→ Download our DCVA technical datasheet (PDF)Backflow incidents cost U.S. water utilities an estimated $1.2 billion annually in remediation, legal fees, and infrastructure damage (AWWA, 2023). Yet many procurement teams still treat double check valve assemblies as a commodity — leading to:
are traced to poor-quality internal check modules that stick or leak within 12 months — causing system downtime and re-inspection costs.
due to oversized packaging and non-standard pallet configurations from unorganized suppliers.
on non-stock sizes (2½"–10") when suppliers lack casting inventory or in-house machining capacity.
Non-compliance with ASSE 1015 / CSA B64 or missing test reports leads to expensive project delays.
The real cost isn't the valve — it's the risk of getting it wrong. Engineering and procurement teams need a partner who delivers certified quality, engineering support, and supply chain reliability — not just a price.
The DCVA uses two independent spring-loaded check valves in series. Under normal flow, both checks open. If pressure downstream exceeds upstream (backpressure), the second check closes first; if it continues, the first check also closes — providing redundant protection. The test ports allow annual field testing per ASSE 1015 without removal.
CNC-machined brass/nickel-plated seats ensure bubble-tight shut-off at first closure — exceeding ASSE 1015 Class II requirements.
Top-entry bonnet design allows internal check modules to be replaced in-line without removing the valve body — cutting maintenance time by 60%.
Certified to ASSE 1015, CSA B64, and CE/PED — accepted by inspectors across North America, Europe, and the Middle East.
In-house foundry and CNC shop enable 15–25 day lead times on standard sizes (½"–10"), with 95% on-time delivery tracked monthly.
Every unit is hydro-tested at 1.5x rated pressure and shipped with a serialized test certificate — traceable to your order.
Custom end connections (grooved, flanged, threaded), coatings (epoxy, nylon), and pressure ratings available for OEM programs.
| Parameter | Specification |
|---|---|
| Size Range | ½" – 10" (DN15 – DN250) |
| End Connections | Threaded (NPT/BSPT), Flanged (ANSI 150/300, PN10/16), Grooved |
| Pressure Rating | 175 psi (12 bar) standard; 250 psi (17 bar) optional |
| Temperature Range | -20°F to 180°F (-29°C to 82°C) |
| Body Materials | Cast iron (ASTM A126), Ductile iron (ASTM A536), Bronze (ASTM B62), Stainless steel (CF8/CF8M) |
| Trim Materials | Brass, Stainless steel 304/316, Nylon-coated |
| Elastomers | EPDM (standard), NBR, Viton® (high-temp) |
| Certifications | ASSE 1015, CSA B64, CE/PED, ISO 9001:2015, WRAS (optional) |
| Testing | 100% hydrostatic shell test @ 1.5x rated pressure; seat leakage test @ rated pressure |
| Warranty | 5 years against manufacturing defects |
Read the full case study: "How a Texas Chemical Plant Reduced Valve Failure by 52% with Thriveon DCVA" →
Every Thriveon double check valve backflow preventer is manufactured under an ISO 9001:2015 certified quality management system. Our products carry the following approvals:
We provide full certification documentation with every shipment — including material certificates, hydrostatic test reports, and ASSE compliance declarations. No surprises at inspection.
→ Request sample certificate packageClients include Fortune 500 firms, municipal water authorities, and mechanical contractors across 30+ countries.
A double check valve (DCV) is a simple assembly of two check valves without test ports or isolation valves, typically not testable. A double check valve backflow preventer (DCVA) includes two shut-off gate valves and four test cocks, making it field-testable per ASSE 1015. Only a DCVA satisfies code requirements for cross-connection control in most jurisdictions.
It is required at any low-to-medium hazard cross-connection — such as irrigation systems, fire sprinkler lines, boiler feed, cooling towers, and commercial kitchen equipment. Most local plumbing codes (UPC, IPC) mandate a DCVA for non-health-hazard applications. Health-hazard connections require a reduced pressure zone (RPZ) device.
Per ASSE 1015 and most local codes, a DCVA must be tested annually by a certified backflow tester. Additional tests are required after repair, relocation, or suspected water hammer events. Thriveon's DCVA test ports are color-coded and clearly labeled to speed up testing.
Some DCVA models are approved for vertical installation — but only with flow upward. Thriveon's standard DCVA is certified for horizontal installation; for vertical applications, we recommend our spring-assisted check module option. Check local codes and always consult the manufacturer's installation manual.
Common body materials include cast iron, ductile iron, bronze, and stainless steel (CF8/CF8M). Trim (internal components) is typically brass or stainless steel, with elastomers in EPDM, NBR, or Viton®. For potable water applications, ensure materials meet NSF 61 or WRAS standards. Thriveon offers full material traceability.
For standard sizes (½"–10") with common end connections, lead time is 15–25 working days. Custom configurations (special flanges, coatings, or OEM branding) typically require 25–40 working days. Thriveon's in-house foundry and CNC facility allow us to reduce lead time by 30% compared to industry averages.
Yes. For qualified engineering firms, utilities, and OEMs, we offer free samples (freight collect) for performance evaluation. We also provide 3D models, pressure drop curves, and installation drawings to support your design review. Request your sample here →
We provide a 5-year warranty against manufacturing defects. Our technical team is available via email, WhatsApp, and video call for troubleshooting. In the rare event of a defect, we ship a replacement within 48 hours and cover return shipping. We also maintain an FAQ library and installation video portal for self-service support.
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South of Huanmadian Village Town, Ningjin County, Xingtai, Hebei Province, China
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South of Huanmadian Village Town, Ningjin County, Xingtai, Hebei Province, China 
