SD 721 devices are pilot-operated relief valves designed to open automatically when the value of the pressure in the system to be protected exceeds the preset value. The opening and closing of the main valve are controlled by a pilot device which is very sensitive to pressure variations.
Reference standard: EN ISO 4126-4
CE certificate according to PED 97/23/EC
| MODEL | SD 721 |
|---|---|
| TECHNICAL CHARACTERISTICS |
Maximum allowable pressure: 16/20, 40/50, 100 bar Relief pressure: 0,04 ÷ 75 bar Intervention accuracy class (AG): up to 1% |
| CONNECTION TYPE |
Equal flanges: PN 16, PN 20/ANSI Class 150 PN 25, PN 40, PN 50/ANSI Class 300 PN 64, PN 110/ANSI Class 600 Nominal diameter: DN 25 ÷ DN 300 |
| OPERATING CONDITIONS |
Ambient temperature: -30°C ÷ +80°C Working fluid temperature: -20°C ÷ +60°C |
| WORKING MEDIUM | Natural gas and other non-corrosive gases |
