NRVA check valve, for ammonia and fluorinated refrigerants

Check valve type NRVA can be used in liquid, suction and hot gas lines in refrigeration and air conditioning plants with ammonia. NRVA can also be used in refrigeration systems with fluorinated refrigerants.
When 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.
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