Spring Loaded Check Valve (45MP)
- Forged 316L stainless steel
- Low-resistance sanitary check-valve design
- 145 PSI maximum operating pressure
- Silicone, FKM and EPDM seat options
- Wetted surfaces finished to 32 Ra or better
- 3-A certified
Spring-Loaded Sanitary Check Valve
Wayland 45MP spring check valves provide low-resistance, one-direction flow control for sanitary process systems handling low- and medium-viscosity fluids. The forged 316L stainless steel body uses clamp connections and is field-serviceable with selectable seat materials.
Features
- Forged 316L stainless steel construction
- Low resistance to flow
- Suitable for low- and medium-viscosity fluids
- Full-size flow plate
- Long stem bushing for extended service life
- All wetted surfaces finished to 32 Ra or better
- Maximum operating pressure of 145 PSI
- Silicone, FKM and EPDM seat and O-ring options
- 3-A certified (58-02), authorization 3773
Seat Temperature Ranges
- Silicone: -58°F to 428°F
- FKM: 0°F to 392°F
- EPDM: -40°F to 302°F
Spring Check Valve Cross-Section
Dimensions, Cracking Pressure & Valve Configurations
Dimensions are in inches. Published cracking pressures are based on vertical installation. Select a part number to open that valve variation.
| Valve size | Dimensions (in.) | Cracking pressure (PSI)* | 316L part number by seat | |||||
|---|---|---|---|---|---|---|---|---|
| A | B | C | L | Silicone | FKM | EPDM | ||
| 1/2" | 1.99 | 0.98 | 0.37 | 3.50 | 3.5 | W645MP-S-.50 | W645MP-V-.50 | W645MP-E-.50 |
| 3/4" | 2.52 | 0.98 | 0.62 | 3.50 | 1.8 | W645MP-S-.75 | W645MP-V-.75 | W645MP-E-.75 |
| 1" | 2.52 | 1.99 | 0.87 | 4.13 | 4.2 | W645MP-S-1 | W645MP-V-1 | W645MP-E-1 |
| 1-1/2" | 3.05 | 1.99 | 1.37 | 4.56 | 2.8 | W645MP-S-15 | W645MP-V-15 | W645MP-E-15 |
| 2" | 3.58 | 2.52 | 1.87 | 5.06 | 1.3 | W645MP-S-2 | W645MP-V-2 | W645MP-E-2 |
| 2-1/2" | 4.17 | 3.05 | 2.37 | 5.37 | 1.3 | W645MP-S-25 | W645MP-V-25 | W645MP-E-25 |
| 3" | 4.68 | 3.58 | 2.87 | 6.13 | 0.5 | W645MP-S-3 | W645MP-V-3 | W645MP-E-3 |
| 4" | 5.69 | 4.68 | 3.84 | 8.13 | 0.5 | W645MP-S-4 | W645MP-V-4 | W645MP-E-4 |
| 6" | 8.54 | 6.57 | 5.78 | 10.16 | 0.6 | W645MP-S-6 | W645MP-V-6 | W645MP-E-6 |
The manufacturer chart supplied lists sizes through 6 in. The product selector also includes 8 in.; its dimensions, cracking pressure, and part numbers are not shown here pending confirmation.
Valve Components & Materials
| Item | Component | Material | Qty. |
|---|---|---|---|
| 1 | Upper valve body | 316L | 1 |
| 2 | Body O-ring | Silicone / FKM / EPDM | 1 |
| 3 | Spider sprocket | 316L | 1 |
| 4 | Spring | 316L | 1 |
| 5 | Plunger | 316L | 1 |
| 6 | Plunger O-ring | Silicone / FKM / EPDM | 1 |
| 7 | Body O-ring | Silicone / FKM / EPDM | 1 |
| 8 | Lower valve body | 316L | 1 |
| 9 | Pin | 304 | 2 |
| 10 | Clamp | 304 | 1 |
| 11 | Bolt | 304 | 1 |
| 12 | Wingnut | 304 | 1 |
Parts are identified by the numbered callouts in the exploded assembly.
Replacement Seat Kits
| Valve size | Silicone (red) | FKM (green) | EPDM (black) |
|---|---|---|---|
| 1/2" | W45MP-ST-S-.50 | W45MP-ST-V-.50 | W45MP-ST-E-.50 |
| 3/4" | W45MP-ST-S-.75 | W45MP-ST-V-.75 | W45MP-ST-E-.75 |
| 1" | W45MP-ST-S-1 | W45MP-ST-V-1 | W45MP-ST-E-1 |
| 1-1/2" | W45MP-ST-S-15 | W45MP-ST-V-15 | W45MP-ST-E-15 |
| 2" | W45MP-ST-S-2 | W45MP-ST-V-2 | W45MP-ST-E-2 |
| 2-1/2" | W45MP-ST-S-25 | W45MP-ST-V-25 | W45MP-ST-E-25 |
| 3" | W45MP-ST-S-3 | W45MP-ST-V-3 | W45MP-ST-E-3 |
| 4" | W45MP-ST-S-4 | W45MP-ST-V-4 | W45MP-ST-E-4 |
| 6" | W45MP-ST-S-6 | W45MP-ST-V-6 | W45MP-ST-E-6 |
Each kit includes two body O-rings and one plunger O-ring.
Product Support & Distributor Inquiries
Review the listed connection, size and operating specifications when selecting a check valve. Explore Spring Check Valve and the sanitary valve range, or contact Wayland for help identifying product documentation.
