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2-Stroke Engine Exhaust Valve L.O. Pipes Suppliers
Exhaust valves on large two-stroke crosshead engines are opened hydraulically and need reliable, continuous lubrication. In many installations, a branch of the main engine lubricating-oil circuit feeds a hydraulic power supply for exhaust valve actuation, while the valve closes on an air spring around 7 bars.
That combination makes the exhaust valve L.O. pressure pipes deceptively important spares. They are small-bore, high-stress lines that carry pressurized oil from the hydraulic power supply/distributor to each exhaust valve actuator, operating in a hot, vibrating, cyclic environment. When they fail, the consequences are rarely limited to just a leak - you’re looking at lost actuation integrity, oil spray risk on hot surfaces, and unplanned downtime.
Sourcing 2-Stroke Engine Exhaust Valve L.O. Pipes
For marine buyers, the market splits into two-stroke engine exhaust valve L.O. pipes original makers and competent workshops able to manufacture replacements to an exact spec. The challenge is that these parts are highly engine-specific, and small deviations in geometry, fitting type, or surface condition can significantly reduce service life.
Original engine manufacturers supply the pipe as a defined spare part, and will expect you to order strictly by part number and engine identity. Using the spare parts list reference from the engine manual is the simplest way to avoid confusion and make sure the supplier quotes the exact pipe you need.
Aftermarket 2-stroke engine exhaust valve L.O. pipes suppliers are a practical option for many fleets - especially for older engine models - because many pipes are essentially custom-bent high-pressure lines manufactured to drawings. On Records Marine you’ll see marine parts vendors listing 2-stroke engine exhaust valve hydraulic pipe coverage across all major low-speed engine brands (MAN B&W, Sulzer/WinGD, etc.)
Because each pipe is often custom-bent to order, lead times can range from 4 to 12 weeks or more, depending on workload. OEM sourcing (e.g. direct from MAN or Wartsila) is usually at the long end (10-12+ weeks). Specialized two-stroke engine exhaust valve L.O. pipes fabricators in Asia may deliver faster (4-6 weeks).
Preventing Early Exhaust Valve L.O. Pipe Failures
Early failures after replacing exhaust valve L.O. pressure pipes usually come down to a few repeat issues: the replacement pipe or fittings don’t match the installed routing exactly, the joint makeup is incorrect, the line is left vulnerable to vibration, or the new part introduces defects or contamination that act as crack starters or create hydraulic-side problems.
- Wrong pipe revision or geometry (forced fit) → Order by spare parts list reference from the engine manual, engine type/serial, cylinder number/side, and include photos of the installed routing and clamp points.
- Vibration fatigue from missing/incorrect supports → Require the pipe to match original clamp locations and routing, and request tagging per cylinder to prevent swap mistakes.
- Leaks or cracks at fittings due to incorrect assembly or mismatched components → Specify no mixed fitting systems, supply new sealing elements where applicable, and require the supplier to state the exact fitting type/standard.
- Bend-zone defects → Request a basic dimensional check and NDT spot-check at bends.
- Poor cleanliness/preservation (debris inside the line) → Require cleaned/flushed delivery, capped ends, and protected sealing faces.
- Insufficient pressure integrity verification → Require a proof / hydro test report (commonly ≥1.5× working pressure) with the shipment.
- Material or certification gaps → Ask for EN 10204 3.1 material certificates for tube and end fittings, and welding qualifications if welded ends are used.
2-Stroke Engine Exhaust Valve L.O. Pipes Suppliers
If you’re looking for the right exhaust valve L.O. pressure pipe for a specific engine and need to confirm part number, routing, and fitting type, an experienced 2-stroke engine exhaust valve L.O. pipes suppliers can guide you through the details before you order. Records Marine was built to help you compare vendors in one place. Start with the list below to find and contact the right supplier.

Year Founded: 2011
Verified
CATEGORIES:
Engine Exhaust Valve L.O. High Pressure Pipes (2-S
15 PPM Monitoring Equipment
AIS (Automatic Identification Systems)
AMS (Alarm Monitoring Systems)
ARPA (Automatic Radar Plotting Aids)
(177)
BRAND:
Mescomar
Nova Werke
Fluid Mechanics
POPPE + POTTHOFF
BELLOS & CO.
(17)
CLASS APPROVED:
DNV
WAREHOUSES:
Singapore
United Arab Emirates
Angola
Austria
Australia (209)

Year Founded: 2004
Verified
CATEGORIES:
Engine Exhaust Valve L.O. High Pressure Pipes (2-S
15 PPM Monitoring Equipment
AIS (Automatic Identification Systems)
AMS (Alarm Monitoring Systems)
ARPA (Automatic Radar Plotting Aids)
AUS (Automatic Unloading Systems)
Accommodation Ladder Davits
Accomodation Ladders & Gangways
Air Compressors
Air Driven Motors
Air Horns
Air Reservoirs
Air Starters
Alpha Lubrication Systems
Anemometers
(162)
CLASS APPROVED:
ClassNK
BV

Year Founded: 2025
Verified
CATEGORIES:
Engine Exhaust Valve L.O. High Pressure Pipes (2-S
15 PPM Monitoring Equipment
AIS (Automatic Identification Systems)
AMS (Alarm Monitoring Systems)
ARPA (Automatic Radar Plotting Aids)
AUS (Automatic Unloading Systems)
Accommodation Ladder Davits
Accomodation Ladders & Gangways
Air Compressors
Air Driven Motors
Air Horns
Air Reservoirs
Air Starters
Alpha Lubrication Systems
Anemometers
(166)
WAREHOUSES:
Hong Kong

Year Founded: 2020
RM verified
CATEGORIES:
Engine Exhaust Valve L.O. High Pressure Pipes (2-S
Air Compressors
Air Driven Motors
Air Horns
Air Starters
Alpha Lubrication Systems
Automation Control Equipment & Control Units
BackWash Filters
Boiler Automation Equipment
Centrifugal Pumps
(71)
BRAND:
MITSUBISHI
SULZER
MAN
WAREHOUSES:
Turkey
China
Greece
Japan
South Korea (1)

Year Founded: 2010
RM verified
CATEGORIES:
Engine Exhaust Valve L.O. High Pressure Pipes (2-S
15 PPM Monitoring Equipment
Accommodation Ladder Davits
Accomodation Ladders & Gangways
Air Compressors
Air Driven Motors
Air Horns
Air Reservoirs
Air Starters
AIS (Automatic Identification Systems)
Alpha Lubrication Systems
AMS (Alarm Monitoring Systems)
Anemometers
Anti-Heeling Systems
ARPA (Automatic Radar Plotting Aids)
(166)
CLASS APPROVED:
ABS
RINA
RMRS
ClassNK
CCS
(11)
Year Founded: 2002
RM verified
CATEGORIES:
Engine Exhaust Valve L.O. High Pressure Pipes (2-S
Air Compressors
Air Driven Motors
BWTS (Ballast Water Treatment Systems)
Engine Fuel Injection High Pressure Pipes (2-Strok
Engines (2-Stroke)
Engines (4-Stroke)
Engine Starting Systems
Exhaust Gas Boilers
Exhaust Gas Turbochargers
(13)
BRAND:
MAN
MITSUBISHI
SULZER
CLASS APPROVED:
ABS
ClassNK
CCS
BV
LR
(1)
CATEGORIES:
Engine Exhaust Valve L.O. High Pressure Pipes (2-S
Boat Engines
Diesel Generators
Engine Blowers (2-Stroke)
Engine Fuel Injection High Pressure Pipes (2-Strok
Engine Starting Systems
Engines (2-Stroke)
Engines (4-Stroke)
Exhaust Gas Turbochargers
Filter Candles
Filters
Filtration Systems
Fuel Injectors & Fuel Valves
Fuel Pumps & Plunger Barrel
Gas Engines
Gas Turbine Engines
High Pressure Fuel Pumps
Hydraulic Operation Equipment
Hydraulic Pumps
Seals for Pumps

Year Founded: 2018
CATEGORIES:
Engine Exhaust Valve L.O. High Pressure Pipes (2-S
15 PPM Monitoring Equipment
AIS (Automatic Identification Systems)
AMS (Alarm Monitoring Systems)
ARPA (Automatic Radar Plotting Aids)
(195)
BRAND:
Mescomar
Nova Werke
Fluid Mechanics
POPPE + POTTHOFF
BELLOS & CO.
(17)
CLASS APPROVED:
ABS
ClassNK
CCS
BV
WAREHOUSES:
China
CATEGORIES:
Engine Exhaust Valve L.O. High Pressure Pipes (2-S
15 PPM Monitoring Equipment
AIS (Automatic Identification Systems)
AMS (Alarm Monitoring Systems)
Accomodation Ladders & Gangways
Air Compressors
Air Driven Motors
Automation Control Equipment & Control Units
BWTS (Ballast Water Treatment Systems)
BNWAS (Bridge Navigational Watch Alarm Systems)
Boat Engines
Boiler Automation Equipment
Centrifugal Pumps
Communication Equipment
Compass (Gyro & Magnetic)
(91)
WAREHOUSES:
Turkey

Year Founded: 2014
CATEGORIES:
Engine Exhaust Valve L.O. High Pressure Pipes (2-S
15 PPM Monitoring Equipment
AIS (Automatic Identification Systems)
AMS (Alarm Monitoring Systems)
ARPA (Automatic Radar Plotting Aids)
AUS (Automatic Unloading Systems)
Accommodation Ladder Davits
Accomodation Ladders & Gangways
Air Compressors
Air Driven Motors
Air Horns
Air Reservoirs
Air Starters
Alpha Lubrication Systems
Anemometers
(168)
WAREHOUSES:
Egypt

