Introducing the Master Flo Cyclical Stem Seal and the unparalleled high-cycling choke performance it provides
In the demanding world of high-cycling choke applications, reliability and extended runtime are non-negotiable. That is why here at Master Flo we are proud to unveil our exclusive Cyclical Stem Seal (CSS), an evolutionary sealing solution engineered to excel under frequent cycling and low-pressure gas conditions.
Engineered for unmatched endurance
The CSS is meticulously designed to combat the challenges of frequent cycling, delivering unparalleled runtime and performance. Its innovative four-part design ensures superior sealing and durability.
- Bottom Ring: Crafted from PEEK material with an integrated scraper to prevent stem debris accumulation.
- Third Ring: Features a new lip seal with an energized PTFE-filled seal for enhanced pressure responsiveness.
- Second Ring: Composed of HNBR elastomer, providing flexibility and exceptional gas sealing capabilities.
- First Ring: Made from durable PEEK material, ensuring long-lasting performance.

Proven field performance
The CSS has undergone rigorous testing, both in the field and at our Edmonton R&D facility, completing thousands of test cycles. It has been in successful use for over two years with multiple end users executing high-cycling choke applications, delivering up to three times longer service life than previous designs.
Unmatched operational benefits
- Maximized Productivity: Reduce downtime and boost profitability with longer maintenance intervals.
- Reliable Sealing: Virtually eliminates stem leaks in high-cycling and low-pressure applications.
- Cost Savings: Maintenance cycles extended from three weeks to nearly two years in some cases.
An exclusive Master Flo solution
The CSS leverages Master Flo’s engineering excellence, delivering a proprietary solution designed for maximum efficiency and performance.
Seal the deal with the CSS
Ready to experience superior runtime, minimal leaks, and optimal performance? Contact us today to learn how the Master Flo CSS can elevate your operations.
