ZheJiang LongGong Valve Technology Co.,Ltd continuously improves its products and production processes to better satisfy the needs and expectations of our customers. Top Line delivers its products on time, and every time, defect-free.
LongGong Valve has developed and implemented a quality management system which covers all aspects of production, purchasing, inspection and servicing of the company's product. Processes are defined in the company's QA/QC manual. Our quality technicians are trained to inspect and test products to the latest United States and International hygienic standards. LongGong's engineers actively participate and have membership in the following Standards Committees: API600、API602,API603,GB,JIS Positive material identification is maintained and monitored from the arrival of raw materials to shipment of finished products. In-house testing with a Niton XLp alloy analyzer and periodic third party analysis insures conformity to material specifications.