SD 721

SAFETY DEVICES

Safety relief valve

SD 721

MAIN CHARACTERISTICS of
Safety relief valve SD 721

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

MORE INFORMATION
Safety relief valve SD 721

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