 
                        
                        A double gravity drain valve
                     
                                        
                        
                             
                        
                        A double-guided drain valve
                     
                                        
                        
                             
                        
                        A double-guided drain valve 2
                     
                                        
                        
                             
                        
                        A new type of inverted bucket adjustable pilot pilot steam trap with large displacement
                     
                                        
                        
                             
                        
                        A new type of inverted bucket adjustable pilot pilot superheated steam trap
                     
                                        
                        
                             
                        
                        A type of jet pump for steam condensate recovery
                     
                                        
                        
                             
                        
                        A round-plate bimetallic thermostat-type superheated steam trap
                     
                                        
                        
                             
                        
                        A medium and high pressure super-large displacement steam trap