CWZ pump, CWZ marine pump

II-b. Self-priming Centrifugal CWZ Pump

Qmax to 100m3/h, Hmax to 75m, self-priming, coupling type

SKU: Built-in self-priming device, Compact structure, Easy installation/service, Inlet/outlet flange size same, Convenient maintenance Categories: , , , , , , ,

The SILI CWZ pump is a single stage, single suction, end-suction centrifugal marine pump. It is especially with built-in self-priming device. (No need for extra water ring or air ejector vacuum pump). CWZ pump is suitable liquid for fresh water or sea water with little particle below 70 C degree; specially mechanical seal for 120 C degree.

CWZ horizontal self-priming centrifugal marine pump application for fire-fighting pump, bilge pump, ballast pump, G/S(general service pump), and also cooling pump. With its built-in self-priming device, it is very suitable for the emergency condition purpose, there is no need extra self-priming pump, so the CWZ pump save space and make easy operation and maintenance. CWZ pump spare parts can be also available in our sides.


CWZ self-priming centriufgal marine pump Feather:

a. Self-priming design, with a no-return valve at the suction sides, avoid return of water when pump stopping.

b. Two bearing housings fitted with deep groove rolling ball bearings. Pumps are fitted with greased for life bearings, or bearings are oil bath lubricated.

c. High quality mechanical seals(carbon/ceramic/stainless steel), most of the pumps are designed with sealing rings at the front and back of impellers.

d. Bronze pump casing&body, impellers and stainless steel shaft as standard for sea water.

e. Flanges are usually in Chinese GB standard, however other standard flanges in EN(DIN), ANSI, and JIS and so on, can be also provided.

Refer to more pump and its spare parts details from the CWZ pump catalogue, and contact us more information for pump specification, manual, performance curve, installation dimension, spare parts list and so on.


The CWZ pump is available in sizes ranging from 32 mm to 100 mm on the suction flange. The suction flange and the discharge flange are in same size.

The CWZ pump is are self-priming single-stage, single suction centrifugal pumps used in marine and off shore industry. This pump has a built-in self-priming device, therefore, no need extra self-priming, such as water ring vaccum pump or air ejector pump. The pump is a so-called “End-suction” type, i.e. suction and pressure branches are mounted on vertical line.

Shaft and shaft seal: basically there are two kinds of shaft sealing: the packing and the mechanical seal, a mechanical shaft seal with stainless steel shaft is a standard.

Bearings: the pump shaft is guided by two rolling bearings. It is usually designed for grease lubrication or oil lubrication.

Material for wet part: pump impeller, pump cover & casing(body) are in brozne for standard for sea water, while for fresh water, cast iron pump casing is optional

Motor: in high class and insulation level, TEFC, IEC standard, 50Hz or 60Hz, especially designed for marine and off shore purpose.

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Technical details:

–Motor: 2 pole quality IEC motor configurations, with high level class(class F or higher) and insulation(insulation IP44 or higher), in both 50Hz or 60Hz, Y-H series, suitable for marine purpose, Starting in direct type(small power) or Star-delta type.

–Material: pump casing/casing cover/drain cover/suction cover: bronze(sea water) or cast iron(fresh water), impeller/wear ring, bronze, shaft, shaft sleeve and key, stainless steel

–Shaft seal: mechanical seal, material: SIC(silicon carbide),hard alloy and ceramics, double face mechanical seal for big power pump.

–Priming: built-in self-priming casing and cover, with check valve in the discharge pipe, suction head about 4-5meter

–Coupling: flexible coupling type, material in carbon steel, or direct coupled as optional.

–Bearing: motor side, two enclosed antifriction bearing, lubricated by grease; pump side, two deep groove rolling ball bearing, lubricated by oil in oil bath.

–Accessory: motor terminal box, lifting hooks, grease nipple, oil cup, air vent plug, drain plug, gauge connection plug and so on.

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Standard pump supply range: including pump, coupling, common base, motor and standard accessories.

Optional supply: accessories: vacuum and pressure gauge, opposite flange, starter, valves, nuts and bolts and so on, suggested min spare parts: 1 pcs of impeller, 1 pcs of shaft, 2 pcs of mechanical seal, 2 sets of bearing, 6 pcs of O-ring

Certificate of classification society available: DNV, LR, ABS, BV, RINA, KR, NK and CCS

Standard packing: plywooden case.

Production time: usually in 25 to 35 days for bronze pump, 20 to 25 days for cast iron pump.

Warranty time: one year after shipment.

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Case reference: it is updated in case blog.
Please click the following link for relative case.

Usage or application: This pump can be use for bilge, sewage, emergency and so on.
Please click the relative category in right of the production picture for more information.

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Kindly send your specific inquiry, we will reply you in one working day.
Please contact us through:
a. directly send us an e-mail , sales@silipump.com(suggested).
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