Kneeling for the national standard of check valve for refrigeration thank you

Sixteen industry standards for refrigeration equipment parts and components under the supervision of the Ministry of Industry and Information Technology have been formally implemented since September 1, 2013.The 16 standards include JB/T 11520-2013 Check Valve for Refrigeration Equipment, JB/T 11521-2013 Piping Fittings for Air Conditioning and Refrigeration Equipment, JB/T 11522-2013 Ball Valve for Air Conditioning and Refrigeration Equipment JB/T 11523-2013 Oil Separators for Air Conditioning and Refrigeration Equipment, JB/T 11524-2013 Dry Fan Coil Units, JB/T 11525-2013 Aluminum Connecting Tubes with Copper Ends for Air Conditioning and Refrigeration Equipment, JB/T 11526-2013 Intersection Bonded Air Filters for Air Conditioning, JB/T 11527-2013 Meter Valve Sets for Refrigerant Charging and Recovery, JB/T 11528-2013 Straight Billet Tubes of Copper and Copper Alloy Seamless Finned Tubes for Refrigeration and Heat Exchangers, JB/T 11529-2013 Protective Sleeves for Air Conditioning Connection Lines, JB/T 11530-2013 Closed Cooling Towers for Refrigeration, JB/T 4119-2013 Solenoid Valves for Refrigeration, JB /T 7230-2013 Four-way Solenoid Directional Valve for Heat Pumps, JB/T 7659.1-2013 Auxiliary Equipment for HFC Refrigeration Units Part 1: Liquid Reservoir, JB/T 7659.4-2013 Auxiliary Equipment for HFC Refrigeration Units Part 4: Finned Heat Exchangers, JB/T 3548-2013 Thermal Expansion Valve for Refrigeration.