Valve packing in detail what? What parameter function?

In the purchase of the valve, like gate valve, ball valve, regulating valve and other valves are required filler. What is the valve packing? What effect?

Roll Up Banner Stand

Roll up banner is a set up publicity poster, or poster stand, display stand. In the advertising industry. Bnnaer is commonly used in street channels with large crowds to assist self-employed roadshows or temporary stalls. The main material of the easy pull shelf is plastic or aluminum alloy, and the poster is made of photo paper.80x200 Digital Printing Display Roll Up Banner Stand1The substitutes for banner are street banners, flags, posters, stickers, etc. The main features of the roll top: 1. The roll top alloy material is simple in shape and cheap in cost. 2. Light and portable, convenient for transportation, carrying and storage. 3. It is easy to install and operate. 4. Easy to use, economical and practical, can change the picture many timesStandard Retractable Roll Up Banner Stands4Standard Retractable Roll Up Banner Stands1

Roll up Advertising Banner Stand,Indoor Advertising Banner Stand,Outdoor Roll Up Banner

Guangzhou Jinshiming advertising equipment Co., Ltd , https://www.gzjsmad.com