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- The safety relief valves manufactured by Caleffi are produced in compliance with the essential safety requirements of the Directive 97/23/EC of the European Parliament and the Council of the European Union for the Harmonization of Member States with regard to pressurized equipment.
Caleffi Safety Relief Valve, Series: 253, 1/2x3/4 in Nominal Size, FNPT, 150 psi, -20 to 360 deg F, Media: Water/Glycol Solution, Brass Body, Chrome Plated
- These safety relief valves are used to control pressure in the primary circuits of solar heating systems
- When the calibrated pressure is reached, the valve opens to release the fluid into the atmosphere and prevents the pressure in the system from reaching levels that might damage the solar collectors and equipment
- These particular series of products have been specially made and certified to work at high temperature with a glycol medium
- 10% opening over pressure
- 20 % closing differential
- 171000 Btu discharge capacity
- Factory set to 45 psi
- Safety relief valve for solar heating systems
- Diaphragm and disk seal in high resistance elastomer
- Spring of stainless steel Control knob of PA6G30
- Calibration setting: 45, 60, 90, 120, 150 psi (3, 4, 6, 8, 10 bar)
- Maximum percentage of glycol: 50%
- Body MaterialBRASSBTU/hr171,000End StyleFNPTNominal Size1/2 x 3/4 inPressure Rating150 psiDimensions2-3/4 in HManufacturerCaleffiManufacturer #253043MediaWater/Glycol MixturePreset psi45Series253Softgoods MaterialHigh Resistance Elastomer Relief SealTemperature Rating-20 to 360 deg FTrim MaterialStainless Steel