A recent inquiry for a China-made YONJOU hot oil pump listed the model as LQRY50-32-160/2-C, quantity one piece. During quotation checking, the supplier clarified an important purchasing detail: LQRY50-32-160/2-C refers to the complete pump set, while LQRY50-32-160/2-B refers to the pump head only, without motor and without base. After confirmation, the customer requirement was for the pump head, so the practical quotation model became LQRY50-32-160/2-B.
This suffix difference is small on paper but important in procurement. A complete set normally includes the hydraulic pump, motor, base, coupling and related assembly parts. A pump-head-only order is different: the buyer reuses the existing motor, base and coupling arrangement at site. For maintenance replacement, this can be the right choice when the old motor is still usable and the plant only needs the worn hydraulic section replaced.
Product identity:
Brand: YONJOU
Series: LQRY hot oil pump
Original requested model: LQRY50-32-160/2-C
Quotation scope model: LQRY50-32-160/2-B
Pump type: single-stage centrifugal hot oil pump
Medium: heat-transfer oil, thermal oil, high-temperature oil
Installation style: horizontal pump arrangement
Connection: flange connection
Origin: China
Main reference data for LQRY 50-32-160:
Capacity: 10 m3/h
Head: 25 m
Speed: 2900 r/min
Shaft power: 1.5 kW
Motor power for complete-set reference: 2.2 kW
Series maximum permissible fluid temperature in public YONJOU product information: up to 370 deg C
Series maximum discharge-side pressure: 0.85 MPa
The model code also gives useful clues. In common centrifugal pump naming, 50 and 32 normally indicate inlet and outlet nominal sizes, while 160 indicates the impeller diameter class. The "/2" points to a two-pole speed class, matching the 2900 r/min catalogue data. In this inquiry, the final suffix decides the supply scope: "-C" for complete machine reference, "-B" for pump head only.
The LQRY series is used for circulating thermal oil in industrial heating systems. These systems are common in chemical production, rubber and plastic machinery, printing and dyeing, food processing, boiler circulation, road material heating, pharmaceutical equipment and synthetic fiber production. A hot oil pump is not the same as a normal clean-water pump. It must handle high temperature, control heat transfer toward the bearing and seal area, and run steadily for long periods.
For this reason, replacement buyers should not confirm an order by model number alone. For LQRY50-32-160/2-B pump head procurement, the following points should be checked before placing the order:
Suction flange size and standard
Discharge flange size and standard
Pump foot dimensions and bolt-hole position
Shaft diameter and coupling fit
Rotation direction
Seal type
Existing motor power and speed
Operating thermal oil temperature
Oil viscosity at working temperature
Nameplate photo of the old pump
Overall installation photos from motor side and pump side
The seal detail is especially important. Public YONJOU information for the LQRY series lists high-temperature sealing arrangements such as shaft seal ring, mechanical seal and carbon seal options. In a real replacement case, the required seal should match the actual temperature and oil condition at site. If the seal material is wrong, leakage may occur even when the model number is correct.
Buying a pump head only can be practical, but it also transfers more responsibility to the buyer. The existing motor and base must match the new pump head. The coupling must fit the shaft. The shaft center height must be right. The flange standard must match the piping. If any interface is different, the plant may need machining, pipe modification or coupling replacement. For export orders, a dimensional drawing should be confirmed before shipment.
A clear purchase description can avoid confusion:
YONJOU LQRY50-32-160/2-B hot oil pump head only, hydraulic model corresponding to LQRY50-32-160/2-C complete-set reference. Capacity 10 m3/h, head 25 m, speed 2900 r/min. Supply pump head without motor and without base. Confirm shaft end, flange dimensions, seal type, rotation direction and outline drawing before production.
This wording is better than writing only "LQRY50-32-160/2-C", because it tells the supplier that the required item is not the full motor-mounted unit. It also helps the buyer avoid receiving a quotation that includes a motor and base when the maintenance requirement is only the hydraulic pump head.
In short, LQRY50-32-160/2-C and LQRY50-32-160/2-B refer to the same basic pump model family, but not the same delivery scope. The "-C" model is useful as a complete-set reference. The "-B" model is the correct purchasing description when the requirement is the pump head only. For maintenance replacement, confirm the physical interfaces first, then confirm the hydraulic performance point, and finally confirm the seal and material details.
Source note: technical data is based on public YONJOU LQRY hot oil pump brochure/product information and the inquiry-specific supplier clarification that "-C" is the complete-machine reference while "-B" is pump head only.