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Product Introduction
Marine engine valve seats are high-performance inserts manufactured from premium heat-resistant alloy steel or reinforced with Stellite cobalt-based alloys. As a critical component of the cylinder head or valve cage assembly, the valve seat provides a precision-engineered sealing surface for the intake and exhaust valves. Its primary functions include ensuring a gas-tight seal during the combustion stroke, transferring intense heat from the valve head to the cooling system, and resisting the repetitive high-velocity impact of the valve mechanism.
Our valve seats feature exceptional thermal stability and superior resistance to hot corrosion, enabling them to withstand the extreme environment of marine diesel engines. meeting the strict CCS classification society certification standards for both new engine assembly and maritime maintenance.
We supply full-range spare parts for marine main engines, auxiliary engines, oil purifiers, air compressors, turbochargers and other marine equipment. Both genuine original spare parts and high-quality OEM replacement parts are available.
Complete models & sufficient stock, supporting bulk supply for shipyards, ship owners and marine service companies worldwide.
一、MAIN ENGINE
Our company specializes in providing comprehensive spare parts for all the aforementioned brand ship engines, including cylinder liners, pistons, injectors, connecting rods, seals, bearings, oil heads, plungers, and more. We offer both stock availability and customized supply options to meet the maintenance needs of various marine diesel engine systems
Product Advantage
1. Stellite Alloy Reinforcement, Outstanding Wear Resistance
Our marine valve seats are often reinforced with Stellite alloy via advanced plasma arc welding or manufactured from high-alloy tool steel. This specialized material provides extreme surface hardness and resistance to "cobweb" cracking and abrasive wear. It can sustain 12,000+ hours of continuous operation without seat face deformation. As core marine spare parts, these seats effectively resist the scouring effect of heavy fuel oil (HFO) combustion by-products, significantly extending the maintenance intervals and reducing the total cost of ownership for ship operators.
2. Ultra-Precision CNC Machining, Perfect Sealing Integrity
All valve seat inserts undergo 5-axis CNC finish machining and mirror grinding to ensure the seating angle and concentricity tolerances are controlled within 0.008mm. This high level of precision guarantees a 100% gas-tight seal with the air valve, preventing compression loss and gas blow-by. By eliminating thermal hotspots caused by uneven seating, our precision-machined valve seats stabilize engine power output and prevent premature failure of the cylinder head assembly during long-distance ocean voyages.
3. Superior Heat Transfer & Hot Corrosion Resistance
The material composition is optimized for maximum thermal conductivity, allowing efficient heat dissipation from the valve head to the cylinder head cooling jacket. Furthermore, the high-chromium and cobalt content provides excellent resistance to hot corrosion and high-temperature oxidation. Facing harsh maritime environments and sulfur-rich fuels, our valve seats maintain their structural integrity and surface smoothness, preventing the pitting and erosion that lead to engine power attenuation and increased fuel consumption.
4. CCS Certified & Rigorous Multi-Stage Quality Control
Every batch of marine valve seats undergoes raw material spectrum detection, ultrasonic bonding inspection (for welded seats), and dimensional full inspection. The qualification rate is maintained at 99.7%, with a field failure rate below 0.3%. We provide official factory test reports and performance data sheets for all orders. Supplied with official CCS Type Approval Certificates, our products allow shipyards and repair shops to perform direct installation without secondary testing, shortening engine overhaul cycles.
Product Uses
1. Maintaining Combustion Pressure in Propulsion Engines
In large-scale marine engines for container ships and tankers, valve seats are vital for maintaining the internal combustion pressure required for propulsion. During long-range sea transportation, the valve seat must provide a reliable landing surface for the valve head thousands of times per hour. Our high-strength seats ensure that no gas escapes during the power stroke, maximizing thermal efficiency and engine reliability. This performance is essential for vessels operating in heavy-traffic shipping lanes where consistent engine response and power are critical for safety and timing.
2. Restoring Engine Efficiency During Overhaul and Repair
Valve seats are indispensable replacement components during major engine overhauls or cylinder head reconditioning. Replacing worn or pitted seats with our high-precision inserts allows ship engineers to restore the engine's original sealing performance and fuel economy. This is particularly crucial for harbor tugs and aged vessels that frequently use low-quality heavy fuel oil, which can cause accelerated seat erosion. By providing a certified and durable replacement, our valve seats help shipowners meet strict classification society regulations and extend the operational life of the entire engine block.
MAIN ENGINE | MAN B&W | S26MC,L/S35MC,L/S42MC,L/S50MC,L/S60MC,L/S70MC,L/S80MC,L/S90MC,S46MC-C,S50MC-C,S60MC-C,S70MC-C,S80MC-C,S90MC-C,K90MC-C,K98MC-C,K/L45GF(CA),55GF(CA),67GF(CA),80GF(CA),90GF(CA) |
WARTSILA | 6L20,9L20,8L32,R22,R32,L20,L32 | |
PIELSTICK | PC2-2,PC2-5,PC2-5L,PC2-5V,PC2-6,PA4,PA5,PA6 | |
HANSHIN | EL30-44,ELS-35,44,LH-28G,LU24-54,LUN28AR(G),LUS24-58,LF46-58 | |
NIIGATA | 16HS,16X,18CX,19HX,20AX,25BX,25CX,26AFTE,26KGHS,28AFTE,28BX,28KGHS,31EZ,31X,32CLX,34AFTE | |
SULZER | RTA38,RTA48,RTA52,RTA58,RTA62,RTA68,RTA72,RTA76,RTA84,RL(A/B)56,RL(A/B)66,RL(A/B)76, RL(A/B)90,RND68,RND76 | |
AKASAKA | A31,A34,A38,A41,A45,AH25,AH27,AH28,AH30,AH38,AH40,K28,K31,DM28FD,DM38FD,DM40FD,DM51SS | |
MITSUBISHI | UEC33LSE,UEC37LA,UEC45LA,UEC50LS,UEC52LA,UEC52LS,UEC60LS,UET45/75C,UET45/80D, UET52/90D,UET52/105H | |
AUX.ENGINE | MITSUBISHI | S6A,S6B,S6R,S6N,S16N,S16R,S12R,SA2 |
MAN B&W | 16/24,20/27,21/31,23/30,25/33,28/32,32/40,48/60,58/64 | |
YANMAR | HAL,KL,KDL,KFL,RAL,MAL,S165,S185,M200,M220,T220,T240,T260,Z280,N165,N18,N21,N165,N260,N280, N330,NY16,EY18,EY22,EY26,4CHL,6CHL | |
DAIHATSU | DK20,DK26,DK28,DK32,DL16,DL19,DL20,DL22,DL24,DL26,DL28,DL32,DS18,DS19,DS22,DS26,DS28,DS32, DS40,PK14,PK16,PL24,PL26,PS18,PS20,PS22,PS26,PS30 |
FAQ
Q1. What is your terms of packing?
A: Generally, we pack our goods in neutral white boxes and brown cartons. If you have legally registered patent, we can pack the goods in your branded boxes after getting your authorization letters.
Q2. What is your terms of payment?
A: Usually T/T100% in short delivery, if the delivery is long 50% as deposit, and 50% before delivery.
We'll show you the photos of the products and packages before you pay the balance.
Q3. What is your terms of delivery?
A: EXW, FOB, CFR, CIF, DDU.
Q4. How about your delivery time?
A: Generally, it will take 7 to 10 days after receiving your advance payment. The specific delivery time depends on the items and the quantity of your order.
Q5. Can you produce according to the samples?
A: Yes, we can produce by your samples or technical drawings. We can build the molds and fixtures.
Q6. What is your sample policy?
A: We can supply the sample if we have ready parts in stock, but the customers have to pay the sample cost and the courier cost.
Q7. Do you test all your goods before delivery?
A: Yes, we have 100% test before delivery
Q8: How do you make our business long-term and good relationship?
A: 1. We keep good quality and competitive price to ensure our customers benefit
2. We respect every customer as our friend and we sincerely do business and make friends with them, no matter where they come from.
