Overflow valves Fig 753 PRESO

The Fig 753 PRESO overflow valve from ARI Armaturen is a spring-controlled differential pressure control valve in straight pattern with flanges to DIN EN 1092-1/-2. It opens as the differential pressure rises and reliably protects plant against overload. The compact construction and the maintenance-free design make it ideal for use in pump protection and bypass lines.

Special features

• Spring-controlled for precise pressure control
• Standard bellows seal for high tightness
• Regulating plug with stable plug guide
• Proportional operating characteristic
• Precise and simple setpoint range adjustment
• TA Luft approval (test no. 922-9241371)

Variants

• Variants in different materials such as grey cast iron, ductile iron, cast steel and stainless steel
• Variant down to −60 °C, manual setting device, PTFE plug (max. 200 °C)

Areas of application

• Overflow duty in liquid, gas and steam lines
• Nominal sizes DN 15 to DN 100 in PN 16
• Temperatures from −10 to +400 °C, optionally from −60 °C
• Plant requiring a hermetic stem seal

Advantages

• Four spring ranges from 0.5 to 10 bar
• Bellows seal as standard
• Materials grey cast iron EN-JL1040, ductile iron EN-JS1049 and cast steel 1.0619+N
• Heating jacket, PTFE plug and manual setting device optional

Selection and installation

The spring range has to be specified when ordering: 0.5–1.5, 1.0–3.0, 2.0–5.0 or 4.0–10.0 bar. The bellows seals the stem hermetically to the outside – which is why this valve is chosen in plant subject to TA Luft.