Having 26 series -312 varieties - over 1000 pump models

Focused on water pump research and development manufacturing for 36 years

Free training for operation and maintenance personnel/free installation guidance/free provision of installation drawings

Type B Shielded Pump



classification:

Other pumps

keyword:

Horizontal Single-Stage Fire Pump

Product overview Product parameters Why choose us? Frequently Asked Questions

Product Overview

A canned motor pump is a seal-less pump in which both the pump and the drive motor are sealed within a pressure vessel that is completely filled with the pumped medium. This pressure vessel features only static seals, and a set of electrical wires provides a rotating magnetic field to drive the rotor.

Product Features

1. The motor and pump are integrated into a single unit, and all seals are static, ensuring that the electric pump is completely leak-free.
2. The fully enclosed, leak-free design allows for the conveyance of toxic and hazardous liquid substances.
3. By adopting a shielded water-cooled motor and eliminating the cooling fan, this pump operates with low noise and in complete silence, making it ideal for applications with stringent environmental noise requirements.
4. Graphite sliding bearings lubricated by the conveyed medium feature lower operating noise and eliminate the need for manual lubrication, thereby reducing maintenance costs. In recent years, bearing materials have also included silicon carbide (SIC) and ultra-hard materials, which offer even longer service lives than graphite bearings.
5. The vertical structure can be installed on pipelines just like a valve, making installation quick and convenient. During maintenance, only the motor and impeller need to be removed—there’s no need to disassemble the pipeline itself.
6. It can be installed and operated in conjunction with shock absorbers or vibration-damping pads, reducing the noise level of the electric pump during operation.

Product Parameters

Shielded Pump Parameters

 Shielded Pump Parameters

Shielded Pump Structural Diagram

What should be noted when maintaining and servicing shielded pumps?
  1. Check whether there are any loose connections at the joints of the shielded pump and pipelines. Manually rotate the pump to see if it operates smoothly, then verify the motor’s rotation direction.
  2. Add bearing lubricating oil into the suspension, and ensure that the oil level is between the two marks on the oil dipstick.
  3. Unscrew the priming plug on the pump body and fill it with priming water.
  4. Close the gate valve on the outlet pipe, as well as the outlet pressure gauge and the inlet vacuum gauge.
  5. Start the motor. Once the pump is operating normally, open the outlet pressure gauge and the inlet vacuum gauge. After confirming that the gauges display appropriate pressures, gradually open the gate valve while monitoring the motor’s load condition.
  6. As much as possible, keep the pump’s flow rate and head within the ranges specified on the shielded pump’s nameplate, ensuring that the pump operates for extended periods near its highest efficiency point to achieve maximum energy savings.
  7. During the operation of the canned motor pump, the bearing temperature rise shall not exceed 35 degrees above the ambient temperature, and the maximum temperature shall not exceed 80 degrees.
  8. If you detect any unusual noises from the shielded pump, stop the pump immediately and investigate the cause.
  9. When shutting down a canned motor pump, first close the gate valve and pressure gauge, then stop the motor.
  10. During the first month of operation, replace the lubricating oil after 100 hours of pump operation. Thereafter, change the oil every 500 hours.
  11. Regularly adjust the packing gland to ensure that the leakage condition inside the packing chamber is normal.
  12. When using a canned motor pump during the depths of winter, after stopping the pump, be sure to unscrew the drain plug at the bottom of the pump body to completely drain the water, thus preventing freezing and cracking.
  13. If a shielded pump is to be left idle for an extended period, it must be completely disassembled, thoroughly dried to remove any moisture, and then the moving parts and all joints should be lubricated with grease before being reassembled and properly stored.

Why choose us?

Changsha Zhonghlian Pump Industry Co., Ltd. was founded in 1989 and was independently established after the restructuring of Changsha Water Pump Factory. It is a comprehensive national high-tech enterprise integrating design, research and development, manufacturing, and service. The company was listed on the Hunan Provincial Equity Exchange on December 31, 2019, with the abbreviation "Zhonghlian Pump Industry" and the equity code: 600275HN. It is currently a key backbone enterprise in China's centrifugal pump industry and one of the major professional manufacturers of multi-stage pumps in the country. The headquarters is located in Changsha City, Hunan Province, a historical and cultural city in China.

41000 m²

Square meters of land area

100 %

100% factory pass rate

41000 m²

Square meters of land area

100 %

100% factory pass rate

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Q

What is your typical delivery time?

A

Models in stock can be shipped the next day at the latest. All others are custom-made, with lead times generally ranging from 7 to 90 days depending on the product size and project specifics. Please contact our sales manager for details: 0731-88632200 。

Q

Do you have centrifugal pumps in stock?

A

Centrifugal pumps come in numerous models and configurations. Except for a small number of high-volume, standard models that are in stock, the vast majority are not stocked and are customized products. We need to select a pump based on your site's flow rate, head, media temperature, pH value, and installation conditions, etc., to determine the pump model and configuration before we can submit an order to the factory for production.

Q

What information should I provide when requesting a quote?

A

Generally, to obtain an accurate quotation, we recommend providing us with the following information: pump flow rate, head, on-site operating voltage and frequency, temperature, pH value, and solid particle content of the fluid being conveyed, and on-site installation conditions (horizontal or vertical installation), etc.

If you are not sure, don't worry, our business managers will assist you in determining this.

Q

What products do you mainly produce?

A

Zhonglian Pump Industry manufactures various large industrial centrifugal pumps. Main products include: self-balancing multi-stage pumps, multi-stage centrifugal pumps, single-stage centrifugal pumps, split-case pumps, chemical pumps, submersible pumps, pipeline pumps, long-shaft pumps, condensate pumps, etc.

Q

Could you help me with the selection?

A

Certainly! If the water pump model is not selected accurately, there will be big problems. If you choose a smaller one, it won't meet your needs; if you choose a larger one, it will waste electricity and fuel, increasing your costs.

Q

Why is it so slow to get a price quote?

A

Because centrifugal pumps are non-standard customized products with many models, the price range is also very large. Even for the same model, the price difference is also very large due to different materials and configurations. Taking the most common water pump accessory—the impeller—as an example, the price of a stainless steel impeller is several times that of a cast iron impeller. Therefore, we need to clarify the relevant information to give you an accurate price. Normally, if you provide relatively comprehensive information, we can quote within 5 minutes.

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