What is negative pressure pvc material

Polyvinyl chloride material. Negative pressure pvc in order to make the wall of the pipe is very smooth, very little resistance to fluid, high compressive strength, is generally used in polyvinyl chloride material material. Negative pressure ward (referred to as pvc) is a hospital operating room and icu wards necessary equipment, but also the National Development and Reform Commission, the Health Planning Commission and other five ministries and commissions, "on the issuance of the notice on strengthening the special rectification of high-value medical consumables work program," one of the eight categories of products in the clear focus of regulation.