Jiangsu Daoer Pump Co., Ltd.

Jiangsu Daoer identifies itself as 江苏道尔泵业有限公司 and lists its base in the Xinqiao industrial area of Jingjiang, Jiangsu. Its catalogue combines several self-priming constructions, fluoroplastic chemical pumps, long-shaft submerged pumps and FJX forced-circulation equipment. Start with the liquid source and the installation arrangement: the same required discharge flow can lead to very different suction, priming and maintenance provisions.

For sewage containing solids or fibres, Daoer’s ZW page describes a recessed impeller arrangement and a passage intended for impurities. It lists a family envelope of 8–800 m³/h and 15–80 m head, with 25–300 mm nominal size. Those independent ranges are a catalogue boundary, not a promise that the largest flow and head occur together. Specify particle size, fibre content and concentration, then request the curve and passage dimensions of the proposed ZW size.

Daoer offers distinct routes rather than a single universal self-priming package. Compare what must happen before liquid reaches the impeller, what is immersed in the source, and which components require access for service.

The FZBL page describes a metal-supported fluoroplastic liquid end and an external bellows mechanical seal. It requires filling before first use and describes subsequent starting using retained liquid. Its stated suction height depends on liquid density. Include the cold first start, restart after shutdown and restart after draining in the enquiry; a proposal that works with a filled chamber may behave differently after maintenance or loss of prime.

Daoer’s TXW description combines a main pump with a vacuum priming tank or vacuum pump, and says the tank and suction pipe normally remain filled. WFB instead describes an electric air-control valve and a centrifugal sealing arrangement. TZFB is presented as another construction with its own air-extraction device. Ask each proposal to identify the actual components and interlocks rather than treating these names as interchangeable suction-lift ratings.

Give the lowest liquid level, site elevation, liquid temperature, suction-pipe diameter and length, bends, valves and inlet arrangement. Specify a permitted priming time under these stated conditions and a response to failed prime. Review inlet pressure and NPSH as well as static lift; neither an air-extraction device nor the family name establishes permission to run the selected pump dry.

The WFB table includes speed, flow, head, matched power, nominal connections and an allowable suction-depth column. The following examples retain flow and head from the same displayed row. They are useful for screening a proposal; the operating curve, liquid properties and agreed material/configuration still govern selection.

WFB is listed in stainless steel, reinforced polypropylene and cast-steel constructions. State the material and ordered category explicitly. Include the electric air-control valve and its control logic in the supply boundary, and ask for operating and stopped-pump sealing instructions. A catalogue statement about an explosion-proof option does not establish certification of every pump, motor or complete assembly.

Daoer has separate catalogue entries for YL vertical multistage long-shaft pumps and long-shaft submerged pumps. Their illustrations show different column and liquid-end arrangements. Choose between them using the liquid duty and complete installation drawing; a long shaft alone does not identify stage count, bearing lubrication or permitted immersion.

Send the tank depth and opening, support elevation, minimum and maximum liquid levels, sediment conditions, nozzle orientation and required discharge head. Request immersed length, wetted materials, bearing/support arrangement and any flushing or lubrication services. The minimum running level must support the proposed intake arrangement, not simply match the bottom of the tank.

Check removal before ordering: a replacement column or shaft may need vertical clearance or an agreed dismantling sequence. Specify lifting points, available crane/door clearance, isolation and drainage. For an existing installation, provide the old assembly drawing and dimensions rather than assuming a new long-shaft catalogue illustration will fit.

The FJX entry concerns forced circulation and lists several seal alternatives, including packing and mechanical-seal arrangements. One clearly paired catalogue entry is FJX450: 2,000 m³/h, 4 m head, 980 rpm and 55 kW matched power. Other size rows contain ranges across configurations, so they should be followed by a selected speed and curve rather than treated as one performance point.

In an evaporator or concentrator loop, differential head describes the circulation resistance; it does not define the casing’s permitted absolute process pressure. Supply vessel pressure or vacuum, liquid temperature and density, crystallisation/solids conditions, required circulation flow and calculated loop losses. Ask the quotation to identify the driver/coupling arrangement and seal-support services for the actual process.

Agree shutdown and restart handling for the process liquid, access to the liquid end, and the cooling or barrier requirements of the proposed seal. Avoid selecting the largest catalogue flow “for safety” without checking the resulting operating region and the process-loop requirement.

FZBL describes fluoroplastic-covered components and different mechanical-seal face choices; the FSB entry describes moulded fluoroplastic wetted parts. Define the chemical name and concentration, mixtures, temperature range, solids and cleaning liquid. Confirm every wetted component: casing/liner, impeller, seal faces, bellows or elastomers, gaskets and any auxiliary piping.

For the FZBL solids-bearing option, the page mentions silicon-carbide face pairing. Confirm particle size and loading with that exact seal arrangement rather than assigning it to every FZBL pump. Obtain a material schedule and duty-specific temperature limits; broad statements about resistance to all acids or concentrations cannot replace a compatibility review.

If the liquid changes between production, washing and shutdown, include all three conditions. A configuration selected for the normal liquid may need a different seal or operating procedure during cleaning. Tie replacement seal and liner parts to the approved drawing and order designation.

For a suction-lift proposal, agree the test liquid, starting fill state, source level, suction-pipe arrangement and time-to-delivery requirement. For hydraulic acceptance, agree the selected speed, flow/head points, motor loading and applicable test basis. Record whether results use water or the actual process liquid and which corrections are required.

Before blaming the pump for low delivery, compare the installed suction arrangement, air ingress, liquid level, rotation, density and viscosity with the approved duty. A suction-side joint can admit air without showing an outward liquid leak. Also identify pressure measurement locations so pipe losses or elevation changes are not mistaken for pump differential head.

Request a general-arrangement drawing, operating/priming sequence, wiring and interlock details for supplied auxiliaries, material schedule, selected curve, test record and drawing-linked spare parts. Define who supplies field piping, supports, level signals and commissioning. Catalogue photos and application labels do not establish a completed reference project or witnessed factory test.

Prepare the enquiry around one actual installation. Identify whether you need sewage transfer, corrosive-liquid suction lift, an immersed tank pump or process circulation, and ask for a configuration-specific proposal.

Review the existing Daoer ZW catalogue record →

Prepare a structured pump-system enquiry →

Submit through KanBeng’s enquiry form with this factory named in your request.