CKF3M/CKF3R Flangeless Check Valve – Reliable Backflow Protection

In industrial steam, air, and water systems, preventing backflow is essential to protecting pumps, heat exchangers, and pipeline integrity. The CKF3M/CKF3R flangeless check valve features a compact all-stainless-steel design with a spring-assisted disc mechanism, delivering tight shut-off, reduced water hammer risk, and reliable performance under demanding pressure and temperature conditions.

1. Why a High-Quality Check Valve Is Essential

In industrial steam, air, and water systems, backflow can cause serious operational issues, including:

• Damage to pumps and heat exchangers
• Water hammer and pipeline vibration
• Pressure instability
• Reduced system efficiency

Selecting a high-performance check valve with fast closing response and tight sealing is critical to ensuring system safety and long-term reliability.

2. The Solution: CKF3M / CKF3R Flangeless Check Valve

The CKF3M and CKF3R are disc-type flangeless check valves designed for installation between standard pipe flanges.

With an all-stainless-steel construction and compact body design, they are suitable for:

• Steam systems
• Compressed air lines
• Industrial water applications

The wafer-style (flangeless) configuration allows simple installation without complex alignment procedures.

3. Compact Design – Easy Installation

Key installation advantages include:

• Slim, space-saving profile
• Direct mounting between flanges
• Self-centering body design
• Suitable for both horizontal and vertical piping

This design reduces installation time and lowers overall project costs.

4. Tight Shut-Off with Two Seat Options

🔹 CKF3M – Metal Seat (Stainless Steel)

• Precision-machined sealing surface
• Excellent durability under high temperature
• Suitable for steam service
• Maximum operating temperature: 350°C

🔹 CKF3R – Fluorine Rubber Seat (FPM)

• Enhanced sealing performance for air and water
• Suitable for moderate temperature applications
• Maximum operating temperature: 150°C

Selecting the appropriate seat material ensures optimal sealing performance and service life.

5. Spring-Loaded Disc Mechanism for Fast Response

The CKF3 series utilizes a spring-assisted disc mechanism:

• When forward flow occurs → the disc opens.
• When flow decreases or reverses → the spring forces immediate closure.

Advantages:

• Rapid shut-off response
• Reduced reverse flow volume
• Minimized water hammer risk
• Faster closing than traditional swing check valves

6. Key Technical Specifications

Specification	CKF3M	CKF3R
Nominal Size	15 – 40 mm	15 – 40 mm
Installation	Between flanges	Between flanges
Max. Operating Pressure (PMO)	3.0 MPaG	1.6 MPaG
Max. Operating Temperature (TMO)	350°C	150°C
Minimum Differential Pressure	0.002 MPa	0.05 MPa
Applicable Fluids	Steam, Water	Air, Water

Pressure Shell Design Conditions:

• Maximum Allowable Pressure (PMA): 3.0 MPaG
• Maximum Allowable Temperature (TMA): 350°C

7. Industrial Applications

CKF3M / CKF3R check valves are widely used in:

• Steam distribution systems
• Pump discharge lines
• Compressed air systems
• Cooling water lines
• Heat exchanger protection

In a steam system where condensate is recovered from multiple branch discharge lines and collected into a main discharge line leading to the condensate tank, the pressure in each branch line may be different. Therefore, a wafer check valve should be installed to prevent condensate backflow from a branch line with higher pressure into another branch line with lower pressure.

For this reason, installing a wafer check valve downstream of the steam trap is necessary to prevent condensate backflow caused by pressure differences between the branch discharge lines.

The stainless steel construction provides strong corrosion resistance and long-term durability.

8. Long-Term Investment Benefits

By installing CKF3 series check valves, operators can achieve:

• Protection of pumps and critical equipment
• Improved system stability
• Reduced risk of water hammer
• Simplified installation
• Lower maintenance costs over time

These valves provide dependable backflow prevention with a cost-effective lifecycle performance.

9. Conclusion

The CKF3M / CKF3R flangeless check valve delivers compact design, fast shut-off response, and reliable sealing performance for industrial steam, air, and water systems.

With stainless steel construction and optimized internal design, it is a dependable solution for protecting equipment and maintaining safe, efficient plant operation.