GB/T 38536-2020 Technical specification for the equipment of hot water heating substation

GB/T 12243-2021 Spring loaded safety valves GB/T 12459-1990 Steel butt-welding seamless pipe fittings GB/T 12459-2005 Steel butt-welding seamless pipe fittings GB/T 12459-2017 Steel buttwelding pipe fittings—Types and parameter GB/T 12459-2025 Steel buttwelding piping fittings—Types and parameters GB/T 12771-2000 Welded stainless steel pipes for liquid delivery GB/T 12771-2008 Welded stainless steel pipes for liquid delivery GB/T 12771-2019 Welded stainless steel pipes for fluid transport GB/T 13006-1991 NPSH for centrifugal, mixed flow and axial pumps GB/T 13006-2013 NPSH for centrifugal,mixed flow and axial flow pumps GB/T 13401-1992 Steel plate butt-welding pipe fittings GB/T 13401-2005 Steel plate butt-welding pipe fittings GB/T 13401-2017 Steel buttwelding pipe fittings—Technical specification GB/T 13401-2025 Steel buttwelding piping fittings—Technical specification GB/T 14382-1993 Tee strainers for fluids for pipes GB/T 14382-2008 Tee strainers for fluids for pipes GB/T 15969.1-1995 Programmable controllers—Part 1:General information GB/T 15969.1-2007 Programmable controllers—Part 1:General information GB/T 17219-1998 Standard for safety evaluation of equipment and protective materials in drinking water system GB/T 17219-2025 Hygienic safety evaluation of distribution equipment,protective materials and treatment materials in drinking water system GB/T 17614.1-1998 Transmitters for use in industrial-process control systems Part 1:Methods of evaluating the performance GB/T 17614.1-2008 Transmitters for use in industrial-process control systems—Part 1:Methods of evaluating the performance GB/T 17614.1-2015 Transmitters for use in industrial-process control systems—Part 1:Methods for performance evaluation GB/T 18033-2000 Seamless copper tubes for water and gas GB/T 18033-2007 Seamless copper tubes for water and gas GB/T 18033-2017 Seamless copper tubes for water and gas GB/T 18300-2001 Specification for automatic sodium ion exchange GB/T 18300-2011 Specification for automatic control sodium ion exchange GB/T 18300-2025 Automatically controlled sodium ion exchangers technical specifications GB/T 18362-2001 Direct-fired lithium bromide absorption water chiller (heater) GB/T 18362-2008 Direct-fired lithium bromide absorption water chiller(heater) GB/T 18431-2001 Steam and hot water type lithium bromide absorption water chiller GB/T 18431-2014 Steam and hot water type lithium bromide absorption water chiller GB/T 19228.1-2003 Stainless steel press-fittings GB/T 19228.1-2011 Stainless steel press-fitting assemblies—Part 1:Press-fittings GB/T 19228.1-2024 Stainless steel press-fitting assemblies—Part1:Press-fittings GB/T 19228.2-2003 Light gauge stainless steel pipes for stainless steel press-fittings GB/T 19228.2-2011 Stainless steel press-fitting assemblies—Part 2:Light gauge stainless steel tubes for press-fittings GB/T 19228.3-2003 O-rings for stainless steel press-fittings GB/T 19228.3-2012 Stainless steel press-fitting assemblies—Part 3:Rubber O-rings GB/T 21359-2008 Stainless steel tube threaded couplings for the food and water industry GB/T 21472-2008 Stainless steel bends and tees for the food industry GB/T 26155.1-2010 Intelligent electrical actuators for industrial process measurement and control systems—Part 1:General specification GB/T 26962-2011 Specifications for high-frequency electromagnetic field comprehensive water treatment device GB/T 28185-2011 Urban heating unit with heat exchanger GB/T 28185-2025 Heat exchange unit for urban heating GB/T 28897-2012 Steel pipes of complex plastic GB/T 28897-2021 Steel-plastic compound pipes and fittings for fluid service GB/T 29771.1-2013 Numerical controller of industrial machines—Part 1:General requirements GB/T 30844.1-2014 Variable-frequency drive of 1 kV and below—Part 1:Technical conditions GB/T 30844.1-2024 Variable-frequency drive of 1 kV and below—Part 1:Technical conditions GB/T 32224-2015 Heat meters GB/T 32224-2020 Heat meters GB 50264-2013 Code for design of industrial equipment and pipeline insulation engineering CJ/T 25-1999 Hand flow adjusting valves for heating CJ/T 25-2018 Hand flow adjusting valves for heating CJ/T 179-2003 Self-operated flow control valve CJ/T 179-2018 Self-operated flow control valve CJ/T 253-2007 Fittings of plastic-steel-plastic composite pressure pipe CJ/T 467-2014 Semi-instantaneous water heater CJJ/T 241-2016 Technical specification for monitoring and controlling system of urban heating HG/T 3133-2006 Electronic water treatment equipment technical specification HG/T 3133-1998 Electronic water treatment equipment technical specification JB/T 7387-2014 Electric control valve for industrial process control system JB/T 7387-1994 Electric control valve for industrial process control system JB/T 8937-2010 Check valve with snap-action design JB/T 8937-1999 Check valve with clamp mount JB/T 9248-2015 JBT 9248-2015 Electromagnetic Flowmeter JB/T 9248-1999 Electromagnetic flowmeter JB/T 9249-2015 vortex flowmeter JB/T 9249-1999 Vortex Flow Sensor JB/T 11049-2010 Self-acting pressure regulating valve JC/T 658.1-2007 Glass fiber reinforced plastic water tank - Part 1: SMC composite water tank JC 658.1-1997 Glass Fiber Reinforced Plastic Water Tank - Part 1: SMC Composite Water Tank JG/T 383-2012 Self-operating differential pressure control valve JJG 1030-2007 Ultrasonic Flowmeters NB/T 47004.1-2017 Plate Heat Exchanger Part 1: Removable Plate Heat Exchanger NB/T 47004.1-2025 Panel-type heat exchanger Part 1: Removable-type panel-type heat exchanger