Hi-Flo™ RD Valve (Radiused Disc Valves)

CPI radiused disc compressor valves are reliable in the oil, gas, petrochemical and air separation industries globally. The CPI Hi-Flo™ RD valve  is capable of operating across a wide range of parameters, including discharge temperatures in excess of 200°C/390°F and pressures in excess of 400 bar/6000psi. CPI radiused disc valves are also suitable for sour gas applications. 

Each valve is individually designed to match the compressor operating conditions for the application. To achieve this, close cooperation with the operator or compressor manufacturer is involved, including a full review of operating and dimensional data to ensure complete interchangeability with existing valves.

CPI Radiused Disc Valve

Radiused thermoplastic discs and seating surfaces result in an aerodynamic flow patterns and lower pressure drop. Thermoplastic materials vary depending on gas and application.

Secondary guidance prevents excessive lateral disc movement.
Specially color coded springs are fitted for reliability and performance continuity. 
All radiused disc valves are fitted with round section buttons to guide the springs and minimize secondary damage to the disc surface.
The standard seat and guard material is ductile iron. More corrosive applications may require alternative materials for the given gas analysis.

Play Radiused Disc Valve Animation

Performance Advantage

The unique radiused profile of the valve discs, which control and seal the process gas as it flows into and from the compressor cylinder, provides a number of important characteristics.

CPI Radiused Disc Valve

Effective Sealing and Efficient Flow

With radiused discs and matching radii on the seat, discs and seats become self-aligning ensuring good conformability throughout the variation of operating temperatures. Effective sealing between disc and seat is continually maintained resulting in efficient flow.

Radiused disc valve features and benefits

> streamlined flow enabling free passage of entrained solids and liquids reducing risk of damage, thereby greatly improving reliability
> flow increase due to good sealing
> conformability with seat - under a wide range of operating conditions
> durable thermoplastic discs with no seat damage or wear
> simple internal design - easy to service
> soft-tempered seat and guard -sour gas (H2S) service (NACE)
> suitable for both lubricated and non-lubricated applications
> increased efficiency and savings on power consumption
> less back-flow and often lower process gas temperatures

Sour Gas Applications

All materials of the seat, guard, springs and other internal components are heat treated within the hardness ranges specified by NACE, as the most desirable to resist sulphide stress cracking in H2S - rich gases. This is made possible due to the low impact loads and wear imparted by the thermoplastic discs, in contrast to metal-plate valves, many of which use