NRVH 35S 1 3/8" LD. non-return valve — Danfoss, OEM manufacturer part number 020-1034. Verified technical data: Product description = NRVH 35S. Applications: refrigeration circuit control, HVAC hydronic loops, process cooling, plant valving for R-series refrigerants and secondary loops. Danfoss is a leading manufacturer in this segment; the 020-1034 sits within the Danfoss valves & regulators range. See our companion Danfoss product family listings for adjacent variants and accessories.