040 Diaphragm valve type 72 (size: 200 mm, 250 mm) can be divided into Model A and Model B. Model A is the standard type. Normally, select Model A. Select Model B when Model A cannot be used due to the relationship between the working temperature and pressure. . MODEL A AND MODEL B DIAPHRAGM MATERIAL: RUBBER AND PTFE NUT BOLT DIAPHRAGM MATERIAL: RUBBER AND PTFE NUT BOLT BONNET LINER BODY LINER DIAPHRAGM MATERIAL: RUBBER AND PTFE NUT BOLT BONNET LINER DISC SPRING WASHER BODY LINER DIAPHRAGM MATERIAL: RUBBER AND PTFE NUT BOLT BONNET LINER BODY LINER DIAPHRAGM MATERIAL: RUBBER AND PTFE NUT U-BOLT BONNET LINER DISC SPRING WASHER BODY LINER DIAPHRAGM MATERIAL: PTFE NUT UBOLT BONNET LINER BODY LINER DISC SPRING WASHER BODY MATERIAL: U-PVC BODY MATERIAL: PP BODY MATERIAL: PVDF MODEL A (STANDARD) MODEL B (OPTION)