Submittal Sheet

ManualsBrandsCaleffi ManualsHeating Supplies1/2" x 3/4" FNPT Safety Valve for Solar Heating Systems (90 psi Preset)

Safety relief valve for solar systems

253 series

General

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.

Function

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.

Product range

253 series Safety relief valve for solar systems size 1/2” F x 3/4” F

1115

Technical specifications

Materials: - body: brass chrome plated

- control spindle: brass

- relief seal: high resistance elastomer

stainless steel:gnirps -

03G6AP:bonk lortnoc -

snoitulos locylg ,retaw:muideM

%05:locylg fo egatnecrep .xaM

ormal pressure: 150 psi (10 bar)

Working temperature range: -20 to 360ºF (-30 to 180ºC)

VIPED section:

according to TÜV SV 07 2009:lavorppA

TÜV • SOL • 50 • p

F ”4/3 x F ”2/1:snoitcennoC

Performance

%01:erusserprevo gninepO

%02:laitnereffid gnisolC

:y: 171,000 BTU (50 kW)ticapac egrahcsiD

Code 253043 253044 253046 253048 253040

Preset psi (bar) 45 (3) 60 (4) 90 (6) 120 (8) 150 (10)

Dimensions

1/2"

3/4"

1”

3/4”

1 3/8”

Code

25304_

Weight (lb)

0.3

CALE FFI

V Rheinland is an approved U.S. Nationally

Recognized Testing Laboratory (NRTL)

Certification Body for Pressure Equipment

Summary of content (2 pages)

PAGE 1
Safety relief valve for solar systems CALEFFI 253 series General 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. Function 111 5 These safety relief valves are used to control pressure in the primary circuits of solar heating systems.
PAGE 2
Operating principle The valve disk (1), pressed by a preset spring (2), raises off the seat when reaching the preset pressure and fully opens the outlet vent. The preset pressure is chosen according to the maximum permissible pressure in the solar heating system. T he d iame ter o f the out let connection (3) is greater than the inlet in order to help discharge the required volume. As the pressure decrease, the opposite action, occurs with the valve subsequently closing within the preset tolerances.