Combines the features of both an air & vacuum valve and an air release valve.
Triple function:
Air & vacuum component discharges large volumes of air during filling of the system.
Air & vacuum component admits large volumes of air during drainage and at water column separation.
The air release component releases entrapped air in pressurized systems.
Dynamic design allows for high velocity air discharge while preventing premature closure.
Innovative rolling seal mechanism.
Available in sizes: 1/2", 3/4", 1" & 2" threaded male connections, NPT or BSPT.
Materials and Corrosion Protection
The body is made of high-strength composite materials.
All operating parts are made of specially selected, corrosion- resistant materials.
D-040-C body is protected by a shell made of Cast Iron ASTM A48 CL.35B.
Application Range
Working pressure range: 0.2-16 bar.
Maximum operating temperature: 60°C.
Maximum intermittent temperature: 90° C.
For installation:
At pump stations
Downstream and upstream of shut-off valves After deep-well pumps
On long constant-sloped pipeline segments
At peaks along the pipeline and at peaks relative to hydraulic gradient.
Additional protective shell for anti-vandalism/theft applications.
Available in: PN 16 – DN15, 20, 25 ,50
The ARI D-040 air valve is available in the following options:
• D-040 1”& 2” - reinforced nylon body and base• D-040 B 1”& 2” -reinforced nylon body and brass base• D-040 C 1”& 2” - ductile iron shell and base (1”base - brass)• D-040 ST. - reinforced nylon body and stainless steel base• D-040 ST ST - stainless steel body and stainless steel base- D-040 LP air valve is designed for very low pressure systems with a maximum working pressure of PN 6 - DG-10 air valve is designed for low pressure systems with a maximum working pressure of PN10- D-040 HT air valve (rated PN10) is designed for hot water systems with a max. working temperature of 90°C.
Why D-40 is BETTER at Maintaining Flow Efficiency:
ARI D-40 Advantages:
1. Dual Orifice System = More Complete Air Removal
- Small orifice (like S-50): Continuously vents dissolved air under pressure
- Large orifice: Rapidly purges big air pockets during startup, valve operations, or pressure fluctuations
2. Prevents Air Re-Entry
- When pressure drops (pump shutdown, valve closing), D-40 prevents vacuum formation
- Vacuum would otherwise suck air back IN through leaks, joints, or negative pressure points
- S-50 cannot prevent this - it only releases air, doesn't protect against vacuum
3. Faster System Recovery
- After filling or draining, D-40 rapidly expels large air volumes
- System reaches optimal flow faster
- S-50 can only vent slowly through its small orifice - takes much longer to restore full flow
4. Eliminates Air Locks
- Large air pockets can completely block flow (air lock)
- D-40's large orifice prevents air locks from forming during filling
- S-50 cannot handle large volumes - air lock risk remains
Real-World Impact on Performance:
| Condition | With D-40 | With S-50 Only |
|---|
| Head Loss | Minimal - air continuously removed | Higher - can only vent slowly |
| Flow Rate | Maintained at design capacity | Reduced by air accumulation |
| Pump Energy | Lower - less resistance | Higher - pump fights air pockets |
| System Fill Time | Fast - large orifice purges quickly | Slow - small orifice only |
| Air Lock Risk | Protected | Vulnerable |
| Vacuum Prevention | Yes - maintains full pipe | No protection |
Hydraulic Efficiency Example:
Scenario: 100mm pipeline, 50 m³/h design flow
With accumulated air (S-50 only):
- Air pockets reduce effective diameter by 10-20%
- Head loss increases by 30-50%
- Flow drops to 40-45 m³/h
- Pump energy consumption increases 25-40%
With D-40 (complete air removal):
- Full pipe diameter maintained
- Design head loss achieved
- Full 50 m³/h flow maintained
- Pump operates at design efficiency
Key Advantage Summary:
D-40 = Superior Flow Efficiency Because:
- ✅ Continuous small air release (same as S-50) - removes dissolved air
- ✅ Rapid large air purging (S-50 cannot do) - removes big pockets quickly
- ✅ Prevents air re-entry (S-50 cannot do) - stops vacuum from sucking air back in
- ✅ Eliminates air locks (S-50 cannot do) - prevents complete flow blockage
Result:
- Lower head losses - full pipe cross-section maintained
- Higher flow rates - no air restriction
- Lower energy costs - pump doesn't fight air resistance
- Faster system optimization - reaches full flow quickly after disturbances
Bottom Line for Your Customers:
"The D-40 doesn't just release air - it PREVENTS air accumulation in the first place by stopping vacuum conditions. This maintains optimal hydraulic efficiency, reduces energy costs, and ensures consistent flow rates. The S-50 can only vent air slowly as it accumulates - it can't prevent the problem."
