Installation manual

37 ©ESP Ltd. Sept 2008
Standards
Complies with EN1490
Approvals
WRAS Certificate No. 0412080
Description
The new Reliance compact pressure and temperature relief valve has been de-
signed to provide protection against over pressurisation which can occur within
an unvented hot water system if the input temperature controls fail. The valve
is designed to be fitted in the upper portion of the cylinder as this is where the
hottest system temperatures will be found. If the system temperature rises be-
yond 95° C the wax mixture within the element of the temperature probe will
expand and this will lift the valve off of it‟s seat and relieve water to waste and
therefore reducing the pressure inside the cylinder. If the water pressure in-
creases (without temperature increase) the valve will stay closed until the set
pressure of the relief mechanism is reached at which point the valve will open
to relieve the excess pressure build-up. The PTEM valve is supplied with PTFE
coated inlet threads for fast installation, twist top easing gear for testing the
valve function and comes with 1/2” MBSP inlet connections and 15mm com-
pression outlet connections.
Product Range
PTEM 550 852: 1/2” x 15mm 7 Bar P&T valve
PTEM 550 853: 1/2” x 15mm 10 Bar P&T valve
PTEM 550 855: 1/2” x 15mm 4 Bar P&T valve
PTEM 550 856: 1/2” x 15mm 4.5 Bar P&T valve
Materials
Body: Brass
Seal: ABS
Lever: Polyamide
Diaphragm: EPDM
Compression nut: Brass
Compression olive: Brass
TPR15 Pressure and Temperature Relief Valves
Dimensions
All dimensions in mm unless stated.