Dual Plate Iron Check Valve | 442 Series | Wafer Style | NBR Seat
Dual Plate Iron Check Valve | 442 Series | Wafer Style | Bronze Discs | NBR Seat | 150 PSI WOG
442 Series Dual Plate Iron Check Valves deliver reliable backflow prevention and compact performance for water, HVAC, and hydronic systems. Constructed with a cast iron wafer-style body, bronze dual spring-loaded discs, and a resilient NBR seat, these valves ensure tight sealing, long service life, and smooth operation under standard system pressures.
Rated for 150 PSI WOG and temperatures up to 180°F, the 442 Series provides low-pressure-drop flow and minimal maintenance requirements. Its wafer-style design fits easily between ANSI flanges, making it a versatile choice for clean water, hydronic heating, and general-purpose mechanical applications.
Key Features & Benefits
- 150 PSI WOG Rating — Reliable performance for water and hydronic systems up to 180°F.
- Bronze Dual Discs — Corrosion-resistant spring-loaded plates ensure long-term durability and quiet operation.
- Wafer-Style Body — Compact, lightweight design installs easily between ANSI flanges.
- NBR Seat (Buna-N) — Provides resilient, leak-free sealing for non-aggressive fluid handling.
- Stainless Steel Internals — Springs and hinge pins built for corrosion resistance and smooth actuation.
Dimensions & Weight
| Size | ΦA [in] | ΦE [in] | B [in] | GR [in] | F [in] | Weight [lb] |
|---|---|---|---|---|---|---|
| 2" | 4.02 | 2.56 | 1.69 | 1.13 | 0.75 | 4 |
| 2-1/2" | 4.76 | 3.15 | 1.81 | 1.42 | 0.79 | 5 |
| 3" | 5.24 | 3.70 | 2.52 | 1.71 | 1.10 | 7 |
| 4" | 6.73 | 4.61 | 2.52 | 0.23 | 1.06 | 12 |
| 5" | 7.60 | 5.71 | 2.76 | 2.59 | 1.18 | 15 |
| 6" | 8.62 | 6.69 | 2.99 | 3.09 | 1.22 | 21 |
| 8" | 10.87 | 8.82 | 3.50 | 4.11 | 1.30 | 35 |
| 10" | 13.27 | 10.43 | 4.49 | 5.00 | 1.97 | 61 |
| 12" | 15.98 | 12.20 | 4.49 | 5.83 | 1.69 | 116 |
Pressure & Temperature Ratings
| Pressure Rating | Temperature Rating |
|---|---|
| 150# WOG | 180°F Max |
Material Construction
| # | Part | Material | Specification |
|---|---|---|---|
| 1 | Body | Cast Iron | A126-B |
| 2 | Disc (Plate) | Bronze | ASTM B584 C83600 |
| 3 | Spring | Stainless Steel | ASTM A313 S31600 |
| 4 | Hinge Pin | Stainless Steel | ASTM A276 S30400 |
| 5 | Stop Pin | Stainless Steel | ASTM A276 S30400 |
| 6 | Plug | Steel | — |
| 7 | Body Washer | PTFE | PTFE |
| 8 | Spring Washer | PTFE | PTFE |
| 9 | Eye Bolt¹ | Steel | ASTM A307-A |
| 10 | Seat | NBR | — |
Compliance: Meets ANSI B16.1 wafer face-to-face standards for dual plate check valves.
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.