UHB Series Phosphoric Acid Pump (UHMWPE Lined Chemical Slurry Pump)

Working Principle

The UHB series phosphoric acid pump is driven by an electric motor connected through a coupling, which rotates the pump shaft and semi-open impeller at high speed.

Under centrifugal force, phosphoric acid or phosphoric acid slurry containing solid particles is continuously drawn into the center of the impeller and discharged into the volute casing.

During this process, the kinetic energy of the fluid is gradually converted into pressure energy, enabling stable and continuous transfer of phosphoric acid media.

The UHMWPE-lined steel construction provides resistance to corrosion and abrasion, making the pump suitable for handling phosphoric acid solutions and slurry under industrial operating conditions.

Parts of UHB Phosphoric Acid Pump

The UHB phosphoric acid pump consists of several key components designed for corrosion resistance and slurry handling performance, including:

pump casing, impeller, shaft, bearing assembly, and sealing system.

Each part is optimized for phosphoric acid service conditions, where both chemical corrosion and solid particle wear may occur.

Pump Casing

• The pump casing adopts a steel structure lined with UHMWPE (ultra-high molecular weight polyethylene), with a lining thickness of 8–20 mm.
• This structure provides resistance against phosphoric acid corrosion and slurry abrasion.
• The lining technology helps reduce risks of cracking, peeling, and thermal deformation under normal industrial operating conditions.
• It is suitable for phosphoric acid transfer systems and other acidic chemical environments.

Bearings

The bearing assembly uses industrial-grade bearings manufactured according to standard machining processes, designed for continuous operation under chemical pump working conditions.

It ensures stable shaft rotation and supports long-term operation in phosphoric acid transfer applications.

Impeller

The impeller is made of UHMWPE material and is available in semi-open or closed structure, depending on the solid content in the phosphoric acid slurry.

It is designed to:

• Improve slurry flow capacity
• Reduce wear caused by solid particles
• Maintain stable hydraulic performance in acidic media

Sealing System

The sealing system is designed to prevent leakage of phosphoric acid and adapt to different working conditions.

Available sealing options include:

• K-type dynamic seal
• Single mechanical seal
• Double mechanical seal
• Packing seal (T-type / customized options)

K-Type Dynamic Seal Principle

The K-type dynamic seal uses a secondary impeller or auxiliary vane to generate centrifugal force during operation.

This creates a negative pressure zone inside the seal chamber, which helps prevent phosphoric acid leakage during pump operation.

At the same time, a rubber oil seal works as a static sealing element when the pump is stopped.

Operating behavior:

• During operation:
  negative pressure reduces contact wear between shaft sleeve and seal
• During shutdown:
  pressure balance changes, and the rubber oil seal tightly contacts the shaft sleeve to prevent leakage

For phosphoric acid applications, cooling water can be introduced if required to extend seal service life.

Cooling water must be clean and controlled (recommended pressure ≤ 0.05 MPa).

The oil seal material is fluororubber, suitable for corrosive media such as phosphoric acid slurry containing solid particles and impurities.

Summary

The UHB phosphoric acid pump is designed based on corrosion-resistant and wear-resistant principles for handling phosphoric acid and phosphoric acid slurry.

Its UHMWPE-lined structure, combined with multiple sealing configurations, allows stable operation in chemical environments where both corrosion and solid particles are present.

It is widely applied in phosphoric acid production, fertilizer processing, mining slurry transport, and chemical wastewater systems.