- 
                            
	Strict management, high precision of manufacturing, first-class quality,
continuous innovation, continuous improvement to
satisfy the customers 
 
	
                         
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	The acceptance rate of first
inspection reaches 98% 
 
	
 
 
	The rate of customer opinion
processing reaches 90% 
 
	
 
 
	The rate of customer
satisfaction reaches 98%
 
	
                         
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	A.  We establish and effectively implement the
ISO9001 quality management system, ISO14000 environmental management system,
GB/T28001 occupational health and safety management system. 
 
	
 
 
	B.  We set up a fully functional
physical and chemical test center with advanced equipment to detect the
physical and chemical properties of metal and nonmetal raw materials and
products. 
 
	
 
 
	C.  We establish X - ray,
ultrasonic, penetration and other nondestructive testing room to detect the
internal defects and appearance quality of the welding seam. 
 
	
 
 
	D.  YIDUO has a variety of pipe
fittings and compensator hydraulic pressure test machine to ensure the strength
and tightness of the product is effectively controlled. 
 
	
 
 
	E.  Anticorrosion performance test of anticorrosive
layer. 
 
	
                         
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	The whole member participation,
whole process control, production, technology, sales, services and  other comprehensive quality management, YIDUO
takes customer satisfaction as the standard.