Fully Metal Seated Ball Valve for PDS of Unipol Polypropylene Unit

The requirement olefins is expected to grow by 4% or more in the next several years. The packaging and automobile industries are  important users of polymers. The market requires high quality polymers.  And valves play an important role in powder discharge system of polymer processing unit.

In April, 2019, C-Tech Science and Technology Co., Ltd has successfully designed and produced the High performance fully metal seated Ball Valves for the PDS of China local Polymer Processing Unit. It is the Unipol gas -phase polypropylene unit of DOW. And the minimum operation cycles is 0.5million(≥0.5 million cycles). Some critical application data of the application as below:

No Name Size Temperature Pressure Medium Stroke Time Frequency
1 Ball Valve DN50 180 600LB Catalyst Contain ≤1 S 1 Cycle/3Min
2 Ball Valve DN25 180 600LB Catalyst Contain ≤1 S 1 Cycle/3Min

The Valves have already delivered to the customer for the operation.

Frequent cycling, high temperatures and high-speed stroke time can damage valve seats and stem, and resulting in increased fugitive emissions

To overcome these abrasive conditions, we adopted the following design as below:

  • The valve type: Fully metal seated Ball Valve, Trunnion Mounted.
  • Special and patent seat design maintains tight shut-off performance to FCI 70-2 Class VI criteria.
  • Integrated stem design and patented sealing packings can be easily retightened to avoid/reduce fugitive emission.
  • Valve Ball and Seat are coated with Tungsten Carbide. Special Coating method and Equipment were adopted. We ensure the ball surface hardness is HRC76, and the seat surface hardness is HRC68. And the thickness of the coating is from 200 to 300 microns.
  • The full-bore design of C Tech PDS valves ensures non-turbulent ow without pressure drops. It also minimise the likelihood of solids build-up that can reduce medial ow.


Some of the application and design data about this kind of PDS valve are protected, and prohibited to share it on the website. Please email or connect us if you want learn more about this kind of valve. And we will share the real application information on the customer side about this valve periodically.