Zhejiang Weilong Pump Co., Ltd.

Weilong describes supplying vehicle manufacturers with water, oil and air pumps, including road-watering, water-transport and wastewater-transfer applications. It also describes overseas supply through vehicle manufacturers. For procurement, establish whether the order is for a bare pump, a drive assembly or a complete vehicle subsystem, and identify who supplies the tank, valves, controls and installation engineering.

Keep the Hangzhou marketing and technical centre separate from the Anji production location. A quotation, inspection visit and dispatch arrangement may involve different addresses. Obtain the current contracting entity and the drawing revision attached to the order.

The water-pump description covers thin, clean liquids without solids or fibres and describes cast-iron and stainless-steel constructions. Specify the actual wetted materials and seal for the water being carried. This description is not a basis for accepting sewage solids or a flammable-fuel duty.

The examples below come from individual official chart rows. Their power column is shaft power, not a supplied motor rating. The document expressly directs motor or hydraulic-drive power and torque selection to the supplier. Allow for the proposed transmission and operating duty when requesting the drive package.

The QZ model key distinguishes upper and lower input-shaft arrangements and different input-speed codes. S and N indicate right and left rotation respectively when facing the input shaft; T2 identifies direct coupling, DJ an electric motor and YM a hydraulic motor. Send a shaft-end sketch showing the viewing direction so that vehicle and pump rotation are agreed unambiguously.

Weilong lists 65QZ-40/45N-FDX, 80QZF-60/90N-FDX and 65QZBG-50/110N-FDX2-40J photographs in its transfer-case direction. The accompanying table lists 65QZ-40/45N variants at 40 m³/h and 45 m, with 1,450 r/min input and 9.25 kW shaft power. A separate 65QZ-40/50N row uses 1,080 r/min and 10.05 kW for 40 m³/h at 50 m. Similar flow and connection size therefore do not establish the same drive requirement.

The model key separates FDXP leather-coupling and FDXG flange-interface arrangements, with TFDXP and TFDXG identified as higher-power versions. These interfaces should be specified using the current assembly drawing, flange dimensions, torque and rotation rather than shortened catalogue names. Agree the drive ratio, engagement method, support and service clearance with the vehicle builder.

For a replacement, photograph the existing mounting, both shaft ends and the nameplate, and provide a dimensioned interface drawing. For a new chassis, give the available PTO speed range and torque, tank height, suction layout and discharge equipment. Ask for the pump and drive assembly as a defined bill of supply.

The G high-pressure direction is presented for road cleaning, barrier washing, spray cooling and dust suppression. The original chart gives three G35.5-R(L) points. As speed rises from 800 to 1,000 r/min, listed flow rises from 118 to 148 L/min while listed pressure falls from 16.5 to 13.5 MPa. A specification of 148 L/min at 16.5 MPa would combine two separate rows.

G35.5 identifies a 35.5 mm plunger diameter; the plunger-page key uses R and L for right and left rotation when facing the input shaft. Keep that page’s code separate from the water-pump S/N convention. Its chart also lists G28 at 93 L/min, 21 MPa and 1,000 r/min, and G40 at 170 L/min, 11 MPa and 900 r/min; larger plunger diameter does not mean a higher pressure rating.

Prepare the total nozzle flow at the intended cleaning pressure, water temperature and inlet conditions, then request the selected speed, drive torque, pressure-control arrangement and permitted duty cycle. Include relief/unloader equipment, gauge, filtration, hoses and service parts in the agreed scope. The table alone does not specify those accessories.

Weilong’s vacuum-pump maintenance guidance, dated 26 February 2020, describes loss of vacuum when the pump is insufficiently lubricated, suction piping or the four-way valve leaks, or sewage enters and obstructs the pump, oil/gas separators and piping. These are system conditions, so specify tank evacuation and protection together with the pump.

The guidance calls for an anti-overflow device and a tank-level viewing provision. Ask for the separator layout, overfill shutdown sequence, valve arrangement and accessible inspection points. The vacuum page supplies photographs but not a model-specific performance chart suitable for assigning an ultimate pressure or pumping speed to an order. Request that chart with tank volume, evacuation time, operating speed and allowable gas load.

For the oil circuit, the maintenance text recommends the specified rigid feed and return lines and describes softened flexible lines restricting oil supply. Obtain the offered model’s oil grade, fill level, pipe routing and return arrangement in its installation manual. Do not apply a general maintenance article’s oil quantity to a different vacuum-pump size.

The gear-pump page names petrol, diesel, kerosene and mechanical lubricating oil as intended media. Its chart distinguishes an internal safety-valve setting from models requiring an external safety valve. The model key labels the flow as full-open flow, so the numbers below are not demonstrated flow rates at the safety-valve pressure.

For 50QZCP-8/5, the table shows 8 m³/h at 500 r/min, 2.2 kW shaft power and a 0.5 MPa internal safety-valve setting. The 50QZCP-15/5 rows show 15 m³/h at 960 r/min and 4 kW with the same setting. The 65QZCL-35-I rows list 35 m³/h at 960 r/min and 8.8 kW with an external safety valve. Specify the valve and its return path in the supply scope.

The page discusses overcoming a delivery hose and meter’s resistance at vehicle idle, but supplies no complete installed-system curve to guarantee that condition. Provide the actual fluid and viscosity, hose length, meter, filter and outlet pressure, together with the available idle-speed drive. Request a confirmed operating point and compatible seals, and identify the fuel installation’s required electrical and hazardous-area approvals.

An original granted utility-model document, CN211039051U dated 17 July 2020, names 浙江威龙泵业有限公司 at Anji’s Kuntong industrial locality. It describes a compound self-priming centrifugal-pump arrangement with a gearbox, multiple impellers and shaft/seal features. This historical design record corroborates the named entity and locality; it does not establish that every current QZ variant uses that arrangement or quantify its service life.

The company describes machining and inspection equipment, a technical development centre and an energy-efficiency test centre at its Anji production base. For an order, ask which tests cover the selected pump and transmission: the agreed flow/head or flow/pressure point, shaft speed, direction of rotation, input torque, seal leakage and assembly interfaces. Attach the test conditions and drawing revision to acceptance.

Its water-pump maintenance note advises draining retained liquid in freezing weather and keeping the flange drain accessible and clear. It also advises leaving a non-leaking mechanical seal assembled and identifies worn faces or aged rubber as leakage causes. A vehicle layout should preserve drain and seal-service access; request the correct seal kit, service procedure and long-storage instructions with the pump.

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