Check Valves

SCA-X, CHV-X Check Valves

SCA-X are check valves with a built-in shut-off 
valve function. SCA-X valves are available in 
angleway versions. CHV-X are check valves only. CHV-X are available in both angleway and straightway versions. The valves are designed to open at very low 
differential pressures, allow favourable flow 
conditions and are easy to disassemble for 
inspection and service. The SCA-X is equipped with vented cap and has 
internal back seating enabling the spindle seal to be replaced whilst the valve still under 
pressure. Laser cut V-ports provide excellent opening
characteristics (SCA-X/CHV-X 50-125). The valve cone has a built-in flexibility to ensure a precise and tight closing towards the valve seat. A well balanced dampening effect between the piston and the cylinder gives an optimal protection during low loads and against pulsations.

Features and benefits

  • Each valve housing is available with several different connection types and sizes
  • Possible to convert SCA-X or CHV-X to any other product in the Flexline TM SVL family (Hand operated regulating valve, shut-off valve or strainer) just by replacing the complete top part
  • Fast and easy valve overhaul service. It is easy to replace the top part and no welding is needed
  • Designed to open at a very low differential pressure of 0.04 bar (0.58 psig)
  • Designed with a built-in damping chamber preventing valve flutter in case of low refrigerant velocity and/or low density
  • Each valve is clearly marked with type, size and performance range. Additional ID ring to be installed when preparing for Ammonia Heat Pump or Propylene application
  • Easy to disassemble for inspection and service
  • Internal backseating enables replacement of the spindle seal whilst the valve is active, i.e. under pressure
  • Optimal flow characteristics ensuring quick opening to the fully open position
  • Protection against pulsation by built-in damping facility
  • Housing and bonnet material is low temperature steel according to requirements of the Pressure Equipment Directive and other international classification authorities
  • Equipped with Stainless steel bolts
  • Classification: DNV, CRN, BV, EAC etc. To get an updated list of certification on the products please contact your local Danfoss Sales Company

NRVA Check Valves

Check valve type NRVA can be used in liquid,
suction and hot gas lines in refrigeration and air
conditioning plant with ammonia. NRVA can also be used in refrigerating systems
with fluorinated refrigerants. When the NRVA is used in liquid lines where cold, thick oil or impurities may be present, it is recommended that the standard spring be replaced by a special spring.

Features and benefits

  • Ensures correct direction of flow
  • Valve housing made of steel
  • Available for 40 bar / 580 psig working pressure
  • Large range of flanges with connection dimensions in accordance with standards: DIN, ANSI, SOC, SA and FPT
  • Fitted with damping piston that makes the valves suitable for installation in lines where pulsation can occur, e.g. in the discharge line from the compressor
  • Classification: DNV, CRN, BV, EAC etc. To get an updated list of certification on the products please contact your local Danfoss Sales Company