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Auto-Soft Flow Actuated Check Valves (KF Flanged)

Auto-Soft Flow Actuated Check Valves (KF Flanged)

TFM’s Auto-Soft flow actuated check valves are designed to replace a KF centering ring, facilitating easy installation and effective throttling of roughing pumps during initial evacuation. When the roughing pump operates, the initial flow causes the vane assembly to close, automatically regulating the pump’s performance. The valves then reopen automatically when a predetermined pressure differential is achieved.

Key Features

  • Durable Construction: Made from 304 stainless steel with an Elgiloy® spring for enhanced durability and corrosion resistance.
  • Temperature Tolerance: Capable of operating at a maximum temperature of 100°C.
  • Reduced Turbulence: Minimizes turbulence in the system by lowering the initial pumping speed, which is especially beneficial in sensitive applications.
  • Application Versatility: Ideal for environments sensitive to particle disruption, such as semiconductor and thin film manufacturing.
  • Complementary Use: Can be used with vent valves when venting a system to mitigate extreme pressure differentials and minimize turbulence.
  • Substrate Protection: Helps prevent damage to substrates during the pumping process.
  • Cost-Effective: Replaces expensive pressure control bypass valves, offering a more economical solution.
  • Fast Action: Features fast-action vane closing, achieving closure in 12 ms or better during testing.
  • No Electrical Power Required: Operates effectively without the need for electrical power.

Performance Notes

  • The typical pump-down time using the soft start check valve is increased by three times.
  • Test results, measured using a 27 CFM pump evacuating a volume of 100 liters, may vary based on the specific system configuration.

Specifications Table

Manufacturer
RatesClosing Flow
6.00 CFM
2.80 L/s
Opening Pressure
2.67 mbar
2.00 Torr
TemperatureBakeable
100 ºC
212 ºF
Actuator
Type		Spring
Spring
Material		Elgiloy
Bearing
Material		Teflon
Vane
Material		Inconel 625
Valve Body
Material		304L SS
Valve Seal
Material		Viton

Ordering Table

Flange SizeClosing Time (sec.)Required Clearance (in.)Part Number
KF40 (2.16″ OD)0.010.7225-0040
KF50 (2.95″ OD)0.0121225-0050

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FAQ

Tube fittings are designed for tubes (measured by outside diameter and wall thickness) used in high-pressure and instrumentation applications, whereas pipe fittings are for pipes (identified by nominal pipe size) primarily used in fluid transport.

 

Common valve types include ball valves, gate valves, check valves, butterfly valves, and globe valves. Each serves a specific function—from quick shutoff (ball/gate valves) to flow regulation (globe valves).

 

  • For tubing, measure the outside diameter; for pipes, refer to the nominal pipe size (using conversion charts if needed). Always match the valve or fitting size to your pipe’s dimensions and flow requirements.

  • Frequently used thread types include NPT (National Pipe Tapered), BSP (British Standard Pipe), and UNC, along with slip-fit options that rely on compression or fusion rather than threads.

Interchangeability depends on manufacturer specifications and certification. Always verify compatibility via manufacturer guides or certified interchangeability charts.

 

  • A coupling is a short, straight fitting used to join two pipes or tubes. It provides a secure, leak-tight connection and can sometimes serve to extend or repair piping runs.

Consider valve type, pressure and temperature ratings, material compatibility with your fluid, actuation method (manual or automatic), and maintenance requirements.

 

  • Valves regulate flow by opening, closing, or partially obstructing the pathway. Their mechanisms (such as the rotation of a ball or the linear movement of a gate) determine the speed and precision of flow control.

  • A flange is a flat, circular component used to connect pipes, valves, or other equipment. Bolted together with gaskets, flanges provide a secure, leak-proof joint that facilitates both assembly and maintenance.

  • Manual valves require physical operation via handles or levers, whereas actuated valves use mechanisms—pneumatic, electric, or hydraulic—to open and close automatically or remotely.

  • Issues include leaks caused by improper installation, over-tightening, degraded seals, material incompatibility, and fatigue from repeated cycling. Regular inspection and proper installation practices help mitigate these problems.

Regular maintenance involves periodic inspections, cleaning or replacing worn seals, ensuring proper torque during installation, and adhering to manufacturer guidelines and local plumbing codes to preserve system integrity.

 

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