overview

Replacement Pressure Relief Valve to Suit Isotemp Water Heaters

Replacement hot water pressure relief valve to suit Isotemp and Quick water heaters.

Pressure and Temperature Relief (P & T Relief) Valves are safety controls which ensure that the temperature of the water in a pressurised unvented water heater cannot exceed 99° C in the event that the normal thermostatic controls fail.

The relief valve will open when the pressure exceeds a pre set valve. If the valve is opening when it is not expected to it may have failed and need to be replaced.  Always check the water system  pressure before replacing the valve.

These valves may be used to guard against over-temperature and over-pressure hazards wherever water is stored in unvented containers. This is a requirement of Australian Standard AS 3500-4.

If you are converting from the flow thru to the new style valve  you will need a TEE fitting

Optional Extra:

15mm Brass Tee piece ½ BSP internal threads to suit 135728 pressure relief valve.

Downloads:

• Isotemp Basic Spare Parts - Suit Basic 24, 30, 40, 50 and 75
• Isotherm Basic/Slim Spare Parts

specification

• Threaded ½” BSP and preset to 500 kPa
• Requires PN 135730 and 135734 if fitting to existing systems.
• Auxiliary pressure relief device
• Prevents pressure building up in the event of a blockage in the drain line
• Female BSP thread on outlet thread
• Prevents incorrect installation to the tank
• Plastic coated temperature probe
• Prevents electrolysis of the probe outer casing
• Dezincification resistant
• Meets Australian Standards for potable water supply
• Sealed spring cavity
• Prevents spring from seizing in the event of calcification
• Suitable for horizontal or vertical installation
• Valve designed to work effectively in either orientation