ANKA Minimum Pressure Valve
Advantage
Features:
- Application: Oil-injected Screw Compressor
- Minimum pressure valve takes FKM or PTFE as sealing elements featured with sensitive check function and reliable sealing.
- Strengthened spring is not easily deformed and fatigued making minimum pressure valve a reliable opening pressure.
- Diverse connection types provide more choice to install and maintenance.
Model Description:
Technic Data:
| Model | Diameter (mm) | Flow(m³/min) | Maximun Working Pressure (Bar) | Working medium Tempreature (℃) | Working Temperature (℃) |
| MPV-20 | 20 | 1.6-2.9 | 16 | -20-120 | -20-60 |
| MPV-25 | 25 | 2.5-4.7 | 16 | -20-120 | -20-60 |
| MPV-32 | 32 | 4.1-7.2 | 16 | -20-120 | -20-60 |
| MPV-40 | 40 | 6.3-10.5 | 16 | -20-120 | -20-60 |
| MPV-50 | 50 | 9.3-16.5 | 16 | -20-120 | -20-60 |
| MPV-65 | 65 | 15-24.5 | 16 | -20-120 | -20-60 |
| MPV-80 | 80 | 21-34.5 | 16 | -20-120 | -20-60 |
| MPV-100 | 100 | 33-60.5 | 16 | -20-120 | -20-60 |
| MPV-125 | 125 | 51-90.6 | 16 | -20-120 | -20-60 |
| MPV-160 | 160 | 91-150.8 | 16 | -20-120 | -20-60 |
| MPV-20A | H:101 | A:50 | B:40 | C:G3/4 | D:G1/4 | E:G3/4 | Diameter:20mm |
| MPV-25A | H:113 | A:60 | B:40 | C:G1 | D:G1/4 | E:G1 | Diameter:25mm |
| MPV-32A | H:147 | A:70 | B:60 | C:G1_1/4 | D:G1/4 | E:G1_1/4 | Diameter:32mm |
| MPV-40A | H:192 | A:65 | B:65 | C:G1_1/2 | D:G1/4 | E:G1_1/2 | Diameter:40mm |
| MPV-50A | H:204 | A:78 | B:65 | C:G2 | D:G1/4 | E:G2 | Diameter:50mm |
| MPV-20JF | H:111 | A:60 | B:40 | C:G3/4 | D:G1/4(Optional) | Diameter:20mm |
| MPV-25JF | H:128 | A:70 | B:50 | C:G1 | D:G1/4(Optional) | Diameter:25mm |
| MPV-32JF | H:160 | A:80 | B:60 | C:G1_1/4 | D:G1/4(Optional) | Diameter:32mm |
| MPV-20F | H:92 | A:40 | B:48 | C:67 | D:G1/4(Optional) | E:G3/4 | Diameter:20mm |
| MPV-25F | H:117 | A:60 | B:48 | C:67 | D:G1/4(Optional) | E:G1 | Diameter:25mm |
| MPV-32F | H:153 | A:70 | B:60 | C:78 | D:G1/4(Optional) | E:G1_1/4 | Diameter:32mm |
| MPV-20K | H:92 | A:40 | B:40 | C:67 | D:G1/4 | E:60 | Diameter:20mm |
| MPV-25K | H:118 | A:60.5 | B:48 | C:67 | D:G1/4 | E:60 | Diameter:25mm |
| MPV-32K | H:151 | A:70 | B:60 | C:78 | D:G1/4 | E:73 | Diameter:32mm |
| MPV-50F | H:260 | A:100 | B:120 | C:4-ø18 | D:4-ø18 | E:125 | F:125 | I:G1/4 | Diameter:50mm |
| MPV-65F | H:292 | A:103 | B:160 | C:4-ø18 | D:4-ø18 | E:145 | F:145 | I:G1/4 | Diameter:65mm |
| MPV-80F | H:339 | A:125 | B:150 | C:8-ø18 | D:8-ø18 | E:160 | F:160 | I:G1/4 | Diameter:80mm |
| MPV-100F | H:340 | A:260 | / | C:8-ø18 | D:8-ø18 | E:175 | F:175 | I:G1/4 | Diameter:100mm |
| MPV-125F | H:342 | A:160 | B:170 | C:8-ø18 | D:8-ø18 | E:210 | F:210 | I:G1/4 | Diameter:125mm |
| MPV-160F | H:345 | A:180 | B:194 | C:8-ø22 | D:8-ø22 | E:240 | F:240 | I:G1/4 | Diameter:160mm |
| MPV-50T | H:215 | A:60 | B:94 | C:4-M16 | D:4-ø20 | E:60 | E1:93 | F:83 | F1:118 | I:G1/4 | Diameter:50mm |
| MPV-65T | H:315 | A:138 | B:102 | C:4-M16 | D:4-ø20 | E:62 | E1:106 | F:70 | F1:120 | I:G1/4 | Diameter:65mm |
| MPV-100T | H:340 | A:144 | B:144 | C:4-M16 | D:4-ø16 | E:78 | E1:131 | F:92 | F1:153 | I:G1/4 | Diameter:100mm |
How to select the right minimum pressure valve
The minimum pressure valve keeps the oil separator above about 4.5 bar whenever the machine is loaded. That pressure is what pushes oil through the filter and what stops oil being carried out with the air, so the valve is chosen by flow first and by connection style second.
- Flow range — MPV-20 1.6–2.9 m³/min, MPV-25 2.5–4.7, MPV-32 4.1–7.2, MPV-40 6.3–10.5, MPV-50 9.3–16.5, MPV-65 15–24.5, MPV-80 21–34.5, MPV-100 33–60.5, MPV-125 51–90.6, MPV-160 91–150.8.
- Rating — 16 bar maximum working pressure across the range; medium temperature −20 to 120 °C, ambient −20 to 60 °C.
- Body style — A and JF versions are screwed (G3/4 to G2), F and T versions are flanged with 4 or 8 bolt holes, which is what large machines use. Pick the style that matches the pipe you already have rather than adapting with a reducer.
- Seals — FKM or PTFE, chosen for oil resistance at temperature.
Installation and maintenance
- Mount vertically with the spring housing up; the piston must be able to fall back by its own weight when the machine unloads.
- Fit a new gasket and tighten evenly — a valve that is not square on its seat leaks internally and the separator then never reaches its set pressure.
- The valve also acts as a check valve. If the machine loses pressure immediately after shutdown, check this seat before looking at the intake valve.
- Do not shim or stretch the spring to raise the opening pressure. The setting is matched to the separator element; raising it only increases oil carry-over and load on the element.
Minimum pressure valve FAQ
What pressure should the minimum pressure valve open at?
About 4.5 bar for a standard oil-injected machine. That is enough to push oil through the filter and to keep the separator element working efficiently, without wasting energy at part load.
Oil is coming out with the air. Is it the separator or the valve?
Check the valve first, because it is cheaper. A weak spring or a worn seat lets the separator pressure fall below the level the element needs, and oil then passes through. If the valve holds 4.5 bar and oil still carries over, the element is the problem.
Can I fit this valve to a 16 bar machine?
Yes — the full range is rated 16 bar. What changes is the flow: pick the model whose flow range covers your machine at its working pressure, not at 8 bar.