Back Pressure Valve (BPV) - AcuFlow Metering Pumps Accessories
ACU Valve is a diaphragm-style, two port pressure sustaining/ back pressure valve designed to provide and control a continuous pressure on the discharge side of a positive displacement style pump, such as metering pumps. The ACU Valve assists with the proper seating of the valve check assembly and the accurate filling of the pump housing chamber for a more efficient and accurate running pump. (Factory set at 50 psig (345kPa))
Standard Features:
- No moving parts in the wetted chamber; a superior choice for “dirty” fluid applications .
- High flow capacity with lower pressure drop.
- Optional diaphragm materials.
- Color coded caps indicate size.
- Sizes ¼” to 4” (8 DN to 100 DN).
- 10 configurations: threaded, socket, union and flanged.
- Injection molded design with fewer moving parts.
- High ambient temperature ranges.
- Gauge port available in either flow direction.
Dimensional Drawings
PVC, CPVC, PP, & PVDF Back Pressure Valves
| NPS | Series | Ø D | J | H | L (Thread) | L (Socket) | L (Union) | L (Flanged) |
|---|---|---|---|---|---|---|---|---|
| 1/4″ | A | 2.50 | 0.66 | 4.48 | 3.40 | 3.40 | N/A | 6.00 |
| 3/8″ | A | 2.50 | 0.66 | 4.48 | 3.40 | 3.40 | N/A | 6.00 |
| 1/2″ | A | 2.50 | 0.66 | 4.48 | 3.40 | 3.40 | 5.40 | 6.00 |
| 1/2″ | B | 3.50 | 0.88 | 4.80 | 4.85 | 4.85 | 6.93 | 6.96 |
| 3/4″ | B | 3.50 | 0.88 | 4.80 | 4.85 | 4.85 | 7.37 | 6.96 |
| 1″ | B | 3.50 | 0.88 | 4.80 | 4.85 | 4.85 | 7.48 | 6.96 |
| 1″ | C | 4.00 | 1.47 | 5.75 | 4.90 | 4.90 | 7.59 | 9.96 |
| 1 1/4″ | C | 4.00 | 1.47 | 5.75 | 4.90 | 4.90 | 7.88 | 9.96 |
| 1 1/2″ | C | 4.00 | 1.47 | 5.75 | 4.90 | 4.90 | 9.27 | 9.96 |
| 2″ | C | 4.00 | 1.47 | 5.75 | 4.90 | 4.90 | 9.61 | 9.96 |
316 SS Back Pressure Valves
| NPS | Series | Ø D | J | H | L (Thread) | L (Socket) | L (Flange) |
|---|---|---|---|---|---|---|---|
| 1/4″ | A | 2.50 | 0.60 | 4.47 | 2.50 | 2.50 | N/A |
| 3/8″ | A | 2.50 | 0.49 | 4.58 | 2.50 | 2.50 | N/A |
| 1/2″ | A | 2.50 | 0.60 | 4.72 | 2.50 | 2.50 | 6.25 |
| 1/2″ | B | 3.50 | 0.63 | 4.80 | 3.50 | 3.50 | 7.25 |
| 3/4″ | B | 3.50 | 0.73 | 4.80 | 3.50 | 3.50 | 7.48 |
| 1″ | B | 3.50 | 0.86 | 5.10 | 3.50 | 3.50 | 7.63 |
| 1″ | C | 4.00 | 1.05 | 5.78 | 4.00 | 4.00 | 8.15 |
| 1 1/4″ | C | 4.00 | 1.05 | 5.78 | 4.00 | 4.00 | 8.14 |
| 1 1/2″ | C | 4.00 | 1.45 | 5.83 | 4.72 | 4.72 | 9.60 |
| 2″ | C | 4.00 | 1.45 | 5.82 | 4.72 | 4.72 | 9.72 |
Performance Curves
The overpressure vs. flow rate curve is based on a valve spring pressure of 50 PSIG (345 kPa).
P1 = working pressure P set = 50 PSIG (345 kPa).
Example:
ECO-55 100 PSIG – 50 PSIG = 50 PSIG = 34 USGPM
690 kPa – 345 kPa = 345 kPa = 128.4 LPM
Thermoplastics Temperature Correction Factors
| F° | C° | PVC | CPVC | PP | PVDF |
|---|---|---|---|---|---|
| 70-90 | 21-32 | 1.00 | 1.00 | 1.00 | 1.00 |
| 100 | 38 | .90 | 1.00 | 1.00 | 1.00 |
| 110 | 43 | .83 | 1.00 | .91 | 1.00 |
| 115 | 46 | .75 | 1.00 | .87 | 1.00 |
| 120 | 49 | .66 | 1.00 | .83 | 1.00 |
| 125 | 52 | .58 | .97 | .79 | 1.00 |
| 130 | 54 | .50 | .95 | .75 | 1.00 |
| 140 | 60 | .33 | .90 | .66 | 1.00 |
| 150 | 66 | NR | .80 | .60 | .97 |
| 170 | 77 | NR | .60 | .43 | .86 |
| 180 | 82 | NR | .50 | .33 | .80 |
The maximum pressure rating for valves regardless of size is 150 PSIG (1034 kPa) at 73o F (22oC).
As ambient, collective surface and fluid temperature increases, the maximum valve pressure rating decreases. The decrease is dependent on the thermoplastic valve material.
Example: CPVC valve operating at 140°F (60°C) Factor at 140°F (60°C) = .90 150 PSIG x .90 = 135 PSIG
Valve is de-rated to 135 PSIG
NR = not recommended