Swing Check Valve | 236AB Series | FNPT × FNPT | Lead-Free Brass
Swing Check Valve | 236AB Series | FNPT × FNPT | Lead-Free Brass
Red-White Valve’s 236AB Swing Check Valve delivers reliable backflow prevention for potable water systems requiring long-term performance, safety, and full regulatory compliance. This Y-pattern swing check design allows smooth flow with minimal pressure drop, making it ideal for residential, commercial, and light industrial plumbing applications.
Manufactured from ASTM B927 C28500 lead-free brass, this ECO-VALVE model meets AB1953, NSF/ANSI 61 & 372, and MSS-SP-80 standards. The FNPT × FNPT threaded ends conform to ASME B1.20.1-NPT for secure, leak-tight connections. Rated 200 PSI WOG @ 15–160 °F and 125 PSI max @ 366 °F, the 236AB offers dependable operation across a wide range of system conditions.
Key Features
- Lead-Free Brass Construction — Certified to AB1953 and NSF/ANSI 61 & 372 for safe drinking water applications.
- Y-Pattern Swing Check — Smooth internal flow path minimizes turbulence and pressure loss while preventing backflow.
- Threaded FNPT × FNPT Ends — ASME B1.20.1-NPT compliant for secure, leak-free pipe connections.
- High Pressure / Temperature Rating — 200 PSI WOG @ 15–160 °F | 125 PSI max @ 366 °F.
- Corrosion-Resistant Materials — All wetted parts are lead-free brass with a PTFE gasket for chemical resistance.
- Meets BAA Requirements — Suitable for federal and commercial spec projects requiring Buy American Act compliance.
Pressure / Temperature Rating
| Pressure | Temperature Range |
|---|---|
| 200 PSI WOG | 15 °F to 160 °F |
| 125 PSI max | Up to 366 °F |
Dimension, Cv, Weight
| Size | A [in] | H [in] | P [in] | Cv | Wt. [lb] |
|---|---|---|---|---|---|
| ½″ | 2.21 | 1.65 | 0.59 | 5.33 | 0.56 |
| ¾″ | 2.76 | 1.97 | 0.75 | 10.5 | 0.86 |
| 1″ | 3.15 | 2.28 | 0.98 | 19.0 | 1.28 |
| 1¼″ | 3.78 | 2.71 | 1.26 | 32.8 | 2.06 |
| 1½″ | 4.33 | 3.19 | 1.50 | 50.6 | 2.84 |
| 2″ | 5.04 | 3.86 | 1.97 | 88.1 | 4.46 |
Material Construction
| # | Part | Material | Specification |
|---|---|---|---|
| 1 | Body | Lead-Free Brass | ASTM B927 C28500 |
| 2 | Disc | Lead-Free Brass | ASTM B927 C28500 |
| 3 | Stem | Lead-Free Brass | ASTM B927 C28500 |
| 4 | Screw | Lead-Free Brass | ASTM B927 C28500 |
| 5 | Gasket | PTFE | PTFE |
| 6 | Cap | Lead-Free Brass | ASTM B927 C28500 |
Warning (California Prop 65): This product can expose you to chemicals including lead, known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.