Servo valves
CEI electrohydraulic servo valves. Pilot stage cleaning and trim, spool service, coil rebuild, seal replacement, and bench testing on the hydraulic stand.
NC Servo Technology - Westland, Michigan
734-326-6666
Independent Repair Shop. Not CEI.
Third-Party Repair of CEI Servo & Proportional Valves
Independent third-party repair of CEI (Continental Electronics Industries) servo valves and proportional valves. CEI is a smaller hydraulic valve maker, and a lot of its hardware is no longer supported by the OEM. We open the units the factory will not, rebuild them at the component level, and send them back. Backed by a 19,000+ unit in-house inventory we pull aftermarket and donor parts from. NC Servo is not affiliated with CEI. Working on this kind of hardware since 1975.
Discontinued and obscure
CEI valves the OEM no longer supports get rebuilt with donor parts from inventory.
Servo and proportional
Both CEI servo valves and proportional valves come through the same bench.
One-year warranty
Standard on parts and workmanship for CEI repairs and rebuilt units.
Brand Reality
Why CEI valves usually arrive at a third-party shop
Most CEI customers we hear from have already called the OEM and either could not get a quote or were told the model was beyond support. CEI sits in the smaller-brand category, and a lot of the install base is on legacy industrial machines that have outlasted the original supplier relationship.
- OEM support for older CEI valves is limited or unavailable in many cases.
- Hard-to-find part numbers tend to live on legacy injection molding, metal forming, and machine tool lines.
- Donor units from a deep aftermarket pool keep the older CEI hardware running.
- Cross-brand alternatives are an option when a CEI valve is genuinely beyond economic repair.
Service Coverage
What NC Servo does with a CEI valve
CEI shipped servo valves and proportional valves over the years, and both come through the same bench. Each unit is opened, inspected, and rebuilt at the component level using parts from inventory or pulled off donor units when the OEM no longer stocks them.
Proportional valves
CEI proportional directional control and flow control valves. Coil work, spool service, driver-card checks where the model has onboard electronics, and full functional verification.
Discontinued and obsolete
Older CEI lines the OEM no longer services. Donor parts pulled from a 19,000+ unit aftermarket pool keep these in service when the factory will not.
By Where They Live
Where CEI valves typically show up
CEI does not have the brand recognition of a Moog or a Vickers, so we rarely see a part number without a story attached. The categories below are the kinds of machines and applications CEI hardware tends to come off of when it lands at the shop.
Plastics & injection molding
Injection speed, clamp pressure, and core positioning loops on legacy and current molding lines.
Metal forming & stamping
Hydraulic press force control on stamping and forming machines where CEI valves were spec'd in originally.
Machine tool & CNC
Axis positioning and tool feed circuits on older machining centers using CEI servo and proportional valves.
Discontinued installs
Industrial hydraulic machines still running CEI hardware on lines the OEM no longer documents.
Common Faults
What usually shows up on a CEI repair
A description of the symptom helps the diagnosis, but a part number or photo is often enough. The categories below cover the kinds of trouble that come in across CEI servo and proportional valves.
| Pilot stage | Pilot-pressure null shift, flapper damage, contamination in the pilot path, or feedback wire wear on servo valves. |
|---|---|
| Spool and body | Spool wear, contamination scoring, sticky spool action, internal leakage past the spool, or seal failure on directional and flow control bodies. |
| Coils and onboard driver | Burned proportional coils, failed onboard driver cards, position-feedback faults, or open windings on the pilot stage. |
| Age and condition | Corroded connectors, heat damage, hardened seals from long service intervals, or evidence of prior repair attempts on legacy CEI units. |
Repair Path
From part number to ship-back
Most CEI jobs follow the same four steps. Lead time varies because some repairs need parts pulled off a donor unit, and CEI donors are not always sitting at the front of the shelf, so we only commit to timing once a tech has the valve in hand.
Get in touch
Phone or email with whatever you have on the unit: a CEI part number, a photo of the body and nameplate, or a description of the application.
Bench review
Once the unit arrives, a tech opens it, inspects internals, and runs it on the hydraulic stand to confirm what failed.
Cost & approval
We call back with the cost and a rough turnaround. Nothing happens without your sign-off.
Repair, test, ship
Failed components are replaced from inventory or off donors, the valve is verified under pressure, and it ships back.
Bench Verification
Each CEI valve gets pressurized before ship
Repaired CEI valves are checked on the hydraulic test stands before they leave. Flow, pressure gain, response, null, and leakage are verified against documented procedures for the family.
- Flow characterization across the operating range for the model.
- Pressure gain and step-response measurement against documented procedures.
- Internal and external leakage checked after seal and spool work.
- Hysteresis and linearity verification on units with onboard driver cards.
Inventory & Parts Pool
A 19,000+ unit pool worth more for an obscure brand
NC Servo's in-house inventory holds over 19,000 valves and drives accumulated since 1975. For a mainstream brand the inventory matters; for a smaller name like CEI, it matters more. That pool is often the only place a discontinued CEI part is going to come from once the OEM has stopped stocking it.
- Aftermarket and donor parts for CEI servo and proportional valves.
- If we have a rebuilt CEI match for your part number, trade in your old valve for a discount on the rebuilt.
- No CEI match on the shelf? We can suggest a comparable cross-brand option that drops in.
- Rebuilt valves carry the same 1-year warranty as a fresh repair.
Repair Scope
Where the line is on a CEI repair
NC Servo works on the valve hardware itself: the body, spool, pilot stage, coils, and any onboard driver-card components. Hydraulic system design, fluid selection, and getting the valve back on the machine stay with your team or your installer.
- Internal valve work: spool service, seal replacement, pilot stage cleaning, coil rebuild.
- Driver-card service on CEI valves with integrated electronics.
- System pressure setup and hydraulic schematic decisions remain on your side.
- Putting the valve back on the machine follows your normal startup process.
More on CEI Repair
Related pages and brands
CEI valves often share a machine with valves from other brands, and the right next page depends on what else is on the line. The pages below cover related coverage and adjacent valve work.
Valve repair hub
The full range of servo and proportional valve repair NC Servo handles, across the brands that come through the shop.
Injection molding
How CEI and other valves get repaired off injection molding machines, where a lot of CEI hardware lives.
Repair vs replace
When component-level repair makes sense versus buying new or rebuilt. Often the central question for a CEI unit.
Moog servo valves
A larger, mainstream servovalve brand we also service. Useful when a CEI valve needs a cross-brand replacement.
CEI valve down with no OEM support?
Give us a call with the part number, a photo, or just a description of the machine. We will check the shelf, and if we have a rebuilt CEI match you can swap your old one for a discount. If we do not, we can suggest a comparable cross-brand alternative or repair the one you have.
FAQ
Common questions about CEI repair
A few things customers ask before sending a unit in. Anything not covered, give us a call at 734-326-6666.
Is NC Servo affiliated with Continental Electronics Industries (CEI)?
No. NC Servo Technology is an independent, third-party repair facility and is not affiliated with, authorized by, or endorsed by Continental Electronics Industries (CEI) or any related entities. All CEI trademarks are the property of their respective owners.
Do you work on discontinued CEI valves?
Yes. CEI is one of the smaller hydraulic valve brands and a lot of their hardware is discontinued or no longer factory-supported. We routinely open CEI servo and proportional valves that the OEM will not touch and rebuild them with parts from inventory or pulled off donor units.
Which CEI products are in scope?
Servo valves and proportional valves: directional control and flow control bodies, with or without onboard driver cards. Send a part number off the nameplate and we will tell you what we have.
Can NC Servo recover programs or trim settings from a failed CEI unit?
Most failures are hardware, and the unit comes back working with its trim and program intact. Corrupted programs are rare; if one is already corrupted before the unit reaches us, that's the one thing we can't recover.
How long does a CEI valve repair take?
It varies. NC Servo is a small independent shop, and lead time depends on the valve, what is wrong with it, and whether parts have to come off a donor. Give us a call once the valve ships in, and we can give a current estimate after a tech has looked at it.
What if the CEI valve is beyond economic repair?
If the valve is not fixable, we will let you know and help source a replacement: a rebuilt CEI match if we have one on the shelf, or a comparable cross-brand alternative.
What is the warranty on a CEI repair?
One year on parts and workmanship for repairs and rebuilt units. Standard exclusions apply for contamination, improper installation, and out-of-spec operation. Flushing and filtering the hydraulic system before reinstalling a repaired valve is recommended.
CEI Products We Service
32 models available
CEI
CEI
CEI 99884
Every minute your CEI 99884 is down costs your operation. We offer expedited repair turnaround...
CEI
CEI
CEI VS52M10SF
A broken CEI VS52M10SF valve can disrupt your entire system. We provide fast repairs and...
CEI
CEI
CEI PVE4420B
Every minute your CEI PVE4420B is down costs your operation. We offer expedited repair turnaround...
CEI
CEI
CEI NO ID TAG
Every minute your CEI NO ID TAG is down costs your operation. We offer expedited...
CEI
CEI
CEI JP10-118
Don't let a faulty CEI JP10-118 valve slow you down. Our technicians specialize in diagnosing...
CEI
CEI
CEI 99916
Don't let a faulty CEI 99916 valve slow you down. Our technicians specialize in diagnosing...
CEI
CEI
CEI 99706
Stop searching for a CEI 99706 replacement. Repair often restores the valve to working condition...
CEI
CEI
CEI 99531
Don't let a faulty CEI 99531 valve slow you down. Our technicians specialize in diagnosing...
CEI
CEI
CEI 99084
Don't let a faulty CEI 99084 valve slow you down. Our technicians specialize in diagnosing...
CEI
CEI
CEI 41055FA
Stop searching for a CEI 41055FA replacement. Repair often restores the valve to working condition...
CEI
CEI
CEI 41053
When your CEI 41053 valve fails, production stops. NC Servo Tech provides repair services to...
CEI
CEI
CEI VS8640VBI31B
Trust your CEI VS8640VBI31B repair to a shop that understands servo and proportional valve technology....
All CEI Products
- CEI 99884 - Model: 99884
- CEI VS52M10SF - Model: VS52M10SF
- CEI PVE4420B - Model: PVE4420B
- CEI NO ID TAG - Model: NO ID TAG
- CEI JP10-118 - Model: JP10-118
- CEI 99916 - Model: 99916
- CEI 99706 - Model: 99706
- CEI 99531 - Model: 99531
- CEI 99084 - Model: 99084
- CEI 41055FA - Model: 41055FA
- CEI 41053 - Model: 41053
- CEI VS8640VBI31B - Model: VS8640VBI31B
- CEI V5S3115SV12B0 - Model: V5S3115SV12B0
- CEI PVE1105 - Model: PVE1105
- CEI JP5 BODY ONLY - Model: JP5 BODY ONLY
- CEI H0920-1500-15 - Model: H0920-1500-15
- CEI 031305-16-95 - Model: 031305-16-95
- CEI 99687 - Model: 99687
- CEI 99527 - Model: 99527
- CEI 90215B122B - Model: 90215B122B
- CEI 41055-FA - Model: 41055-FA
- CEI 3679200130 - Model: 3679200130
- CEI VS8640SB1314 - Model: VS8640SB1314
- CEI V105S - Model: V105S
- CEI PCS601B - Model: PCS601B
- CEI JP15-110 - Model: JP15-110
- CEI H0920-1500-10 - Model: H0920-1500-10
- CEI 99707 - Model: 99707
- CEI 99612 - Model: 99612
- CEI 99477 - Model: 99477
- CEI 62323 - Model: 62323
- CEI 41055 - Model: 41055
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