Import Air Side Ac Sealing Oil Pump Hsnh660-40nz — Buy in wholesale FOB from Supplier in China

The HSNH660-40NZ is a three-screw sealing oil pump designed for the air side of hydrogen-cooled turbine generator sealing oil systems. This positive displacement rotary pump maintains oil pressure at the generator shaft seals, preventing hydrogen leakage while allowing shaft rotation. The HSNH series denotes horizontal, three-spindle screw pumps with external bearings, a configuration suited to continuous duty in thermal power stations where oil contamination risks must be minimised. The 660 in the model code indicates the nominal flow rate in litres per minute; the 40 denotes the nominal working pressure in bar. The NZ suffix typically signifies a specific material or seal variant for this duty.

Three-screw pumps of this class rely on precisely matched timing screws: one power rotor and two idler rotors. The HSNH design employs external bearings, keeping the pumped medium uncontaminated by bearing wear debris. Materials typically comprise nitrided alloy steel for the screws and cast iron or carbon steel for the pump body, though exact material specifications for this variant should be confirmed with the supplier. The pump operates with ISO VG 32 or VG 46 turbine oil at controlled temperature and viscosity. The sealing oil system must maintain oil pressure above hydrogen pressure by a controlled differential, typically 0.05 to 0.08 MPa, to ensure safe generator operation.

Buyers are power plants, generator OEM service departments, and EPC contractors for combined-cycle or coal-fired installations. The HSNH660-40NZ serves as a direct replacement or spare for units originally supplied by domestic Chinese manufacturers or as an aftermarket alternative to imported brands. Procurement typically involves confirming mechanical interface dimensions, coupling arrangement, motor specifications, and whether the pump is supplied bare shaft or with a dedicated motor. Spare parts availability, including screw sets, bearing cartridges, and mechanical seals, is a critical evaluation factor given the long service intervals of generator sealing oil systems.

Deyang Dongfang Yoyik Engineering Co., Ltd. is located at Huashan Plaza, Jingyang District, Deyang, Sichuan Province, China, postal code 618000. The company holds a harbor trust tier on the platform, with no recorded response rate or average response time. The supplier positions itself as providing a full chain of services from equipment selection to after-sales maintenance for power plant applications, with particular emphasis on spare parts supply for thermal power stations. The source description references a team of senior engineers and technical workers with power station construction experience.

The supplier profile does not state founding year, registered capital, annual revenue, employee count, factory floor area, or specific quality certifications such as ISO 9001, ISO 14001, or API standards. No named client references, power station installations, or export licence details are provided. The extensive spare parts list in the source description, including valves, actuators, seals, and other HSNH pump models, suggests trading or distribution activity alongside manufacturing. Buyers should verify whether Deyang Dongfang Yoyik manufactures the HSNH660-40NZ directly or sources it, and request evidence of quality management system certification and prior generator sealing oil system supply references.