Fluid control device

A fluid control device, detecting pressure in a closed space isolated from a flow path, comprising:

• a valve body in which the flow path is formed;
• an isolation member allowing or blocking fluids in the flow path and isolating the closed space from the flow path;
• a bonnet arranged on the valve body, forming the closed space between the isolation member, and providing a penetration hole connected to the closed space and penetrated to be able to vertically move a diaphragm retainer;
• the diaphragm retainer vertically moving in the penetration hole to press the isolation member and providing an increased diameter portion not to be removed from the penetration hole;
• a pressure sensor detecting a pressure inside of the closed space;
• and
• an elastic body interposing between the increased diameter portion of the diaphragm retainer and the bonnet inside of the closed space and elastically expanding and deflating between the increased diameter portion of the diaphragm retainer and the bonnet as the diaphragm retainer vertically moves,
• wherein the bonnet is provided with a storing part opening on a side of the closed space and storing the elastic body.