Retrofitting MAC pulse valves on a citrus juicing line that was eating poppet valves every six weeks
A 220-acre citrus operation in Polk County, with an in-house juicing and concentrate plant running three FMC extractor lines and a downstream finisher. Operations are heavily seasonal, peaking November through April.
Fluid Power
MAC Valves · Camozzi · Allen-Bradley
The problem
The customer was burning through poppet-style solenoid valves on the FMC extractor finishers at an alarming clip — average mean time between failures of 38 days, sometimes as little as 26 days during peak season. Each failure took the affected extractor offline for 90 minutes, and during November–April that meant losing roughly 4,200 gallons of juice per incident at peak rates. The maintenance team was carrying $48,000 of inventory in spare valves and rebuild kits and still missing same-day spares twice a season.
Failure analysis traced the root cause to an aggressive duty cycle (3.5 Hz nominal, with 4.2 Hz spikes) combined with citrus oil contamination in the air supply. The poppets were taking 90,000+ cycles per day; the elastomer seats were degrading from oil exposure faster than the seat-on-poppet wear, leading to unpredictable failures rather than predictable rebuilds.
“The first season after the retrofit, we didn't pull a single valve in November. That had never happened in twenty years on this line.”
What we did
We specified a full retrofit to MAC 56C-series pulse valves — direct-acting solenoid valves designed for high-cycle, high-frequency duty — across all three extractor lines. Twenty-eight valves total. We also installed Camozzi coalescing filters upstream of each manifold to clean up the air supply, and rerouted the air line to add a 5-gallon dead-leg drop to settle out citrus-oil aerosol before it hit the valve bank.
We ran an instrumented test with one extractor for six weeks before approving the full rollout. The retrofit was scheduled across two scheduled outages so the customer never had more than one extractor down at a time. Total project: $74,000 in parts and labor, including the air-supply clean-up.
The result
After 14 months in service, the MAC valves are tracking past 380 days mean time between failures — better than 10× the previous service life. Spare-valve inventory was reduced from $48,000 to $9,000. The customer has not lost an extractor to a valve failure during peak season since the retrofit went in.
Components used
- 56C-series pulse valves (qty 28) MAC Valves
- Coalescing filters & FRL stations Camozzi
- Custom manifold blocks (Adams shop-built)
- Allen-Bradley I/O retrofit on PLCs Allen-Bradley
