Improve productivity of your powder discharge system with superior valves

Handling of polyethylene and polypropylene powder during the product discharge process is a challenging application for valves. It is characterized by high speed, frequent cycling in the presence of abrasive, intrusive powder particles. Polyethylene and polypropylene producers need solutions that deliver tight sealing performance over a long service life to extend the uptime and productivity of the reactor that supplies their downstream processes.

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The Powder Discharge System Process


The production of polyethylene and polypropylene is a licensed process. Within this process, powder is created in a reactor with the addition of a catalyst. This powder is discharged from the reactor for further processing and pelletizing for downstream use. It is during this powder discharge system (PDS) phase that producers face significant challenges in their valve reliability, and ultimately, the productivity of their operations. These process challenges, illustrated in detail below, require superior valve technology to advance producers’ quality and efficiency goals. The blue colored valve icons in the process map below indicate the critical service valves that require priority attention.

Power Discharge System Valve Challenges

What does a superior powder discharge system valve look like?

Specify these features when upgrading your powder discharge system valves

Power Discharge System Valves
Licensor Approved

Licensor Approved

When deployed in a licensed process, select a valve solution approved by the licensor to ensure the integrity of your process.

Verified Performance

Verified Performance

Valves proven to perform 700K cycles are the minimum requirement. Emerson has proven its KTM solution to 2,000,000 cycles.

Integrated Scraper Seat

Integrated Scraper Seat

A smart seat designed to remove powder prior to sealing. The wider face reduces ball surface area pressure and improves longevity.

High Performance Actuator

High Performance Actuator

Must be able to perform high speed, high frequency cycles with the component quality and shock absorption to match the valve life.

Robust Connector

Robust Connector

Must withstand high loads while maintaining tight, vertically aligned engagement between valve and actuator to prevent backlash. 

Engineered Sealing Materials

Engineered Sealing Materials

Backup seals are essential to prevent powder infiltration of the seat springs. A 4 point X-shaped seal is superior to a standard O-ring.

Proven Stem Seal System

Proven Stem Seal System

An engineered stem seal arrangement is crucial to prevent water ingress and process egress while resisting cycle wear.

Hard Coated Components

Hard Coated Components

For enduring performance, critical components across the full valve package should be hard coated including the ball and actuator cylinder.

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