This is a Mueller Steam Specialty Model 71 4-inch cast iron wafer double disc check valve (MPN: 4 71AHB3H). It features a heavy-duty cast iron body rated for ANSI Class 125, stainless steel double discs and trim, Buna-N seating, and 316 stainless steel springs. Designed for process piping applications to effectively prevent backflow in both horizontal and vertical pipe runs.
Inspection & Condition Details:
We have inspected this item and we do not have the capability to install the unit to fully test it. There are some cosmetic scuffs and scratches throughout the unit. The original cardboard box is included but exhibits tearing, tape, and heavy shelf wear. Please refer to the photos for more information.
This unit only includes what is photographed in the listing.
Technical Specs
| Item | Double Disc Check Valve |
| Manufacturer Part Number | 4 71AHB3H |
| Pipe Size | 4 in |
| Body Material | Cast Iron |
| Connection Type | Flange |
| Media Temp. Range | -20 °F to 100 °F |
| Max. Pressure (CWP) | 200 psi |
| Max. Pressure (Steam) | Not Rated |
| Silent Check | Standard |
| Seat Material | Buna-N |
| Seal Material | Buna-N |
| Disc Material | Stainless Steel |
| Spring Material | 316 Stainless Steel |
| Operating Temperature - Minimum | -20 °F |
| Operating Temperature - Maximum | 100 °F |
| Overall Length | 6.875 in |
| For Media | Process Piping |
| Connection Size - Side 1 | 4 in |
| 3-A Compliance | Not Rated |
| ANSI Flange Class | Class 125 |
| Includes Counterweight | No Counterweight |
| Check Mechanism | Double Disc |
| Mounting Orientation | Horizontal / Vertical |
| Connection Type - Side 1 | Flange |
| Connection Type - Side 2 | Flange |
| Valve Body Style | Inline |