Operating principle
The valve opens the outlet on reaching the settings for:
- temperature:
the thermostat compound inside the temperature sensor 1) submerged in the hot
water storage heater, expands as the temperature increases. This expansion causes a thrust
pin to move and act on the obturator 2) opening the valve. The valve is set to open at
temperatures of over 90°C.
- pressure:
the obturator, opposed by a set spring, raises on reaching the pressure setting and
opens the outlet completely. The pressure setting is chosen according to the maximum
permissible pressure in the system.
As the temperature and pressure decrease, the opposite action occurs with the valve
subsequently reclosing within the set tolerances.
Certification
CE mark
309 series TP relief valves comply with the essential safety requirements of Directive 97/23/EC
concerning pressure equipment (also called P.E.D.). They are therefore classified as category IV
and are equipped with the CE mark.
Product certification in accordance with European Standard EN 1490
European Standard EN 1490: 2000, entitled “Building valves - Combined temperature and
pressure relief valves – Tests and requirements”, describes the constructional and performance
specifications that TP relief valves must have.
Caleffi 309 series TP relief valves are certified by Buildcert (UK) to comply with the requirements
of the European Standard EN 1490 (for settings 4 – 7 – 10 bar).
Installation
Before installing a TP relief valve it is necessary for the sizing to be performed correctly by specialized technical personnel in accordance with
the current regulations for the specific applications. Any use other than the intended use is prohibited.
The TP relief valves must be installed by qualified technical personnel in accordance with current regulations.
The TP relief valve must be installed observing the direction of flow indicated by the arrow on the valve body.
Assembly
Plumbing system
TP relief valves must be installed on the top of the hot water storage
heater, making sure that the temperature sensor is correctly
submerged in the tank.
Make sure that there are no shut-off devices between the valve and
the storage heater.
TP relief valves can
be fitted vertically or
horizontally, but not
overturned.
This prevents debris
from impairing
operation.
2
1
HOT WATER
STORAGE
HEATER
HOT WATER
STORAGE
HEATER
HOT WATER
STORAGE
HEATER
HOT WATER
STORAGE
HEATER
SOLAR
STORAGE
SOLAR
STORAGE
We reserve the right to change our products and their relevant technical data, contained in this publication, at any time and without prior notice.
CALEFFI S.P.A.
· I ·
28010 FONTANETO D’AGOGNA (NO)
·
S.R. 229, N.25
·
TEL.INT. +39 0322 8491 R.A.
·
FAX +39 0322 863723
·
Http://www.caleffi.com
·
E-mail: [email protected]
·
CALEFFI
309 series
Temperature and pressure relief valve. Equipped with the CE mark in accordance with directive 97/23/EC. Threaded 1/2” M
connections on the inlet and Ø 15 mm (3/4”x Ø 15 mm and 3/4”x Ø 22 mm) with compression fitting for copper pipe on the
outlet. Temperature setting 90°C. Pressure setting 3 bar (available settings: 3-4-6-7-10 bar for 1/2”, 4 bar for 3/4” x Ø 15 mm,
3-6-7-10 bar for 3/4” x Ø 22 mm). Valves with 4-7-10 bar setting certified to EN 1490 standard. Discharge rating: 1/2” x Ø 15 mm:
10 kW, 3/4” x Ø 15 mm: 10 kW, 3/4” x Ø 22 mm: 25 kW. Medium: water. Nominal pressure: PN 10. Dezincification-resistant
alloy body. Brass stem. Obturator and diaphragm in EPDM. Steel spring. Control knob in glass-fiber re-inforced nylon.
SPECIFICATION SUMMARIES
Correct installations
Correct installation
Incorrect installation
Incorrect installation
