ANKA AIV SERIES INTAVE VALVE
Advantage
Features:
- Application: Power Frequency Oil-injected Screw Compressor
- It’s N/O type and will close in response to a control pressure signal.
- Special structure design solves the problem of high start load.
- At shutdown, intake valve has check function to prevent oil injection through the compressor.
- Intake valve can eliminate cavitation noise from air-end by air admission when unloading.
- Integration of discharge valve, air admission valve, solenoid valve and proportional valve into an intake valve makes it install easily and quickly.
Model Description:
Technic Data:
| Model | Diameter | Flow(m³/min) | Max Working Pressure(Bar) | Working Medium Temperature | Working Temperature |
| AIV-25B | 25 | 0.5-1.2 | 16 | -20-120 | -20-60 |
| AIV-25Y | 25 | 0.5-1.2 | 16 | -20-120 | -20-60 |
| AIV-40A | 40 | 1-2.5 | 16 | -20-120 | -20-60 |
| AIV-40B | 40 | 1-2.5 | 16 | -20-120 | -20-60 |
| AIV-40C | 40 | 1-2.5 | 16 | -20-120 | -20-60 |
| AIV-40F | 40 | 1-2.5 | 16 | -20-120 | -20-60 |
| AIV-40J | 40 | 1-2.5 | 16 | -20-120 | -20-60 |
| AIV-50A | 50 | 2.5-4.2 | 16 | -20-120 | -20-60 |
| AIV-50B | 50 | 2.5-4.2 | 16 | -20-120 | -20-60 |
| AIV-65A | 65 | 4-7 | 16 | -20-120 | -20-60 |
| AIV-65C | 65 | 4-7 | 16 | -20-120 | -20-60 |
| AIV-85B | 85 | 8-14 | 16 | -20-120 | -20-60 |
| AIV-85F | 85 | 8-14 | 16 | -20-120 | -20-60 |
| AIV-100 | 100 | 12-18 | 16 | -20-120 | -20-60 |
| AIV-120B | 120 | 18-25 | 16 | -20-120 | -20-60 |
| Model | Inlet Direction | A | B | C | D | E | F | G | Interface Size | O-Ring Size |
| AIV-25B | Vertical | 75X80 | 55/60 | 62X55 | 53X53 | 74 | ø40 | 4-ø9 | G1/8 | 53X2.65 |
| AIV-25Y | Vertical | 99X99 | 74 | ø104 | ø115 | 83 | ø40 | 4-ø11 | G1/8 | 87.5X2.65 |
| AIV-40A | Horizontal | 100X100 | 74 | ø104 | ø115 | 105 | ø48 | 4-ø9 | G1/4 | 87.5X2.65 |
| AIV-40B | Vertical | 100X100 | 74 | ø104 | ø115 | 105 | ø48 | 4-ø9 | G1/8 | 87.5X2.65 |
| AIV-40C | Vertical | 100X100 | 74 | ø104 | ø115 | 105 | ø48 | 4-ø9 | G1/4 | 87.5X2.65 |
| AIV-40F | Vertical | 120X120 | 84 | ø119 | ø133 | 105 | ø50/48 | 4-ø9/ø13 | G1/4 | 92X3 |
| AIV-40J | Vertical | 137X137 | 104 | ø135 | ø160 | 105 | ø50 | 4-ø14 | G1/4 | 113X3.55 |
| AIV-50A | Horizontal | 134X134 | 76 | ø100 | ø115 | 139 | ø62 | 4-ø18 | G1/4 | 90X3.5 |
| AIV-50B | Vertical | 134X134 | ø100 | ø134 | ø150 | 139 | ø62/ø60 | 4-ø18 | G1/4 | 110X3.5 |
| AIV-50B | Vertical | 134X134 | ø100 | ø130 | ø156 | 142 | ø78 | 4-ø13 | G1/4 | 110X3.5 |
| AIV-65C | Vertical | 150X150 | ø113 | ø149 | ø170 | 156 | ø78 | 4-ø18 | G1/4 | 117X3.5 |
| AIV-65A | Horizontal | 146X146 | ø110 | ø143 | ø170 | 95 | ø78 | 4-ø18 | G1/4 | 117X2.65 |
| AIV-85B | Vertical | 165X165 | ø119 | ø160 | ø176 | 180 | ø100 | 4-ø17 | G1/4 | 132X3.55 |
| AIV-85B | Vertical | 165X165 | ø119 | ø160 | ø176 | 180 | ø100 | 4-ø17 | G1/4 G1/2 | 132X3.55 |
| AIV-100 | Vertical | 154X154 | 114 | ø152 | ø172 | ø250 | ø125 | 4-ø18 | G1/4 | 125X3.5 |
| AIV-120B | Vertical | / | / | / | ø225 | ø305 | ø150 | 8-ø18 | G1/4 | 190X4 |
How to select the right AIV series intake valve
The AIV series is a normally-open intake valve for fixed-speed (power frequency) oil-injected compressors: it stays open at rest and closes when a control pressure signal arrives, which is what removes the high starting load.
- Models and flow — AIV-25 0.5–1.2 m³/min, AIV-40 1–2.5, AIV-50 2.5–4.2, AIV-65 4–7, AIV-85 8–14, AIV-100 12–18, AIV-120 18–25.
- Inlet direction — the 25 and 40 sizes are vertical; AIV-40A and AIV-50A are horizontal. That decides whether the valve fits under the canopy without re-piping.
- Rating — 16 bar, medium temperature −20 to 120 °C, ambient −20 to 60 °C.
- Pilot port — G1/8 on the small bodies and G1/4 on the larger ones; every model has its own flange and O-ring size, listed in the drawing table above.
Installation and maintenance
- At shutdown the intake valve must close fully, otherwise the airend pushes oil back into the intake line. Test it by stopping the machine under load and watching for oil at the filter housing.
- The air-admission (replenishing) function is what removes the cavitation noise from the airend during unloading. If the noise returns, check that the admission port is not blocked.
- Keep the proportional valve adjustment from the previous valve if you are replacing a like-for-like unit; if the size changes, set it again at the controller.
- Bolt torque even and diagonally: a warped flange on a cast body leaks from the O-ring, not from the gasket face.
Aiv series intake valve FAQ
Why is the valve normally open?
So that the machine can start against an open intake, which keeps the starting current low. Once running, the control pressure closes the valve and the machine loads on command.
Can I use an AIV valve on a variable-speed machine?
Not as a direct replacement. Variable-speed machines use the RH series with a different control logic; mixing them gives unstable unloading and, on some controllers, a load/unload fault.
The valve closes but the machine does not build pressure.
Check the proportional valve setting and the solenoid, then the minimum pressure valve. If the intake closes fully and the pressure still does not build, the problem is downstream, not in the intake valve.