Product Introduction
Marine Main Engine Exhaust Valve is an exhaust control component installed in the cylinder system of the main engine of the ship. It is used to open and close the exhaust passage during the engine working cycle to allow the burned exhaust gas to be discharged from the cylinder.
Product Details
|
Name |
Exhaust valve |
|
Category |
Main engine spare parts |
|
Brand |
Man b&w/mitsubishi/sulzer |
|
Specifition |
As per your requirement |
|
Material |
23-8n with stellite / nimonic 80a |
|
Place of original |
China oem / high quality equivalent parts |
|
Packing |
Standard packing |
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Condition |
Brand new |
|
Terms of delivery |
Exw |
|
Price |
To be negotiated |
|
Ports |
China ports and other ports in the world |
Main Offered Models
MAN B&W
* S42MC,S46MC,S50MC,S60MC
SULZER & WARTSILA
* RT-FLEX50,RT-FLEX58T-B,RT-FLEX60,RT-FLEX68T-B,RT-FLEX84T
MITSUBISHI
* UEC45LA,UEC52LA,UEC60LA
Main Supplied Range
Crankshaft, connecting rod, cylinder head, cylinder liner, piston, piston pin, piston ring, water jacket, intake and exhaust valve, rocker arm assembly, fuel injector assembly, high pressure tubing, filter, safety valve, starting valve, indicator valve, expansion joint, tools, water pump, oil pump, gasket, o-ring, gasket, repair kit.
Advantages
High strength and wear resistance
Marine Main Engine Exhaust Valve adopts a combination design of 23-8N stainless steel valve stem and Stellite alloy cladding valve seat. The material yield strength is more than 620 MPa, and the surface hardness can reach HRC 42–46, which can resist high-pressure cavitation and impact wear.
Excellent thermal fatigue resistance
The valve head of the product is forged with Nimonic 80A high-temperature nickel-based alloy, and the thermal expansion coefficient is controlled at 13.5×10⁻⁶/K. The material can maintain more than 85% of its original strength at 700℃, and has excellent heat creep resistance.
Good sealing performance
The key matching parts of Marine Main Engine Exhaust Valve (such as the guide section and the valve seat sealing cone) adopt CNC grinding technology, and the cylindricality and coaxiality tolerances are controlled within 0.01mm, ensuring precise fit with the guide tube and cylinder head seat ring, and a sealing gap within 0.03mm can be achieved in the actual machine test assembly.
Delivery And Shipping Service
24*7 hours online, our services cover all main ports in the world, we can provide the cost and time saving logistics solution to our customers, to provide you with one stop comprehensive services.
FAQ
Q: What are the common structural forms?
A: Most of them are pneumatic or hydraulically controlled spring return valves, including valve stems, valve discs, valve seats, guide tubes and actuators, and some are equipped with rotating mechanisms to extend life.
Q: What are the main materials?
A: High-temperature alloy steel (such as NiCr alloy, Inconel) is often used for valve discs and valve seats, and wear-resistant nitriding steel is used for valve stems, which are resistant to high temperature, corrosion and thermal fatigue.
Q: What parameters should be paid attention to when purchasing?
A: The key includes valve disc diameter, total length, valve stem diameter, installation size, sealing angle, opening pressure and control method.
Q: Is the exhaust valve universal for different hosts?
A: It is not universal. Each host model is equipped with a dedicated exhaust valve, which must be matched according to the technical data such as engine brand, model, cylinder diameter, etc.
Q: What are the common faults of exhaust valves?
A: Sealing surface ablation, valve stem jamming, guide wear, fracture, cavitation or valve disc cracking will affect the exhaust efficiency and endanger the safe operation of the host.
Q: How to judge whether the exhaust valve needs to be replaced?
A: Abnormal engine back pressure, high exhaust temperature, difficult starting, uneven cylinder power, or burnout, deformation, and excessive wear during maintenance.
Q: How long is the life of the exhaust valve?
A: It depends on the load of the main engine and the type of fuel. It is usually 6000-15000 hours. When using low-quality fuel, the life is significantly reduced.
Q: What are the precautions for transportation and storage?
A: Avoid collision and high temperature and humidity. Oil sealing and rust prevention treatment are required. The sealing surface and guide area should be encapsulated with a special protective cover.