ReliancePressure Relief Valve

This can generate a small electrical current that causes the less noble material to corrode and wither away over time. A secondary effect of electrolysis is that the more noble material will be less susceptible to corrosion.

Designed for use on unvented hot water supply systems where protection is essential against excessive temperature and pressures.

Crane Ltd - Registration Number 98677 - © Copyright 2024 Every effort has been made to ensure that the information on this website is correct. Crane Ltd. assumes no responsibility or liability for typographical errors or omissions or for any misinterpretation of the information on the site and reserves the right to change without notice. All text and images on NABIC web sites are the exclusive property of Crane Ltd and are copyrighted and may not be reproduced, copied, transmitted or manipulated without written permission. All images shown are for illustrative purposes only, actual product may vary. Crane BS&U has no direct influence on, or take any responsibility for any working practices employed or depicted in any image(s).

Temperature relief valve

If applied correctly, the natural phenomenon of electrolysis can be harnessed to prevent corrosion in certain applications. Two examples of this are metal components like underground piping systems and storage tanks that are in contact with the ground.

Temperatureandpressure relief valvedripping

For general plumbing needs, a dielectric union consists of a steel connector mated to a brass connector with an electrical insulator between the differing metals. While instrumentation dielectric unions are designed in a similar fashion, they’re actually stainless on both sides. This is because they’re designed to help with a different aspect of corrosion mitigation.

Instrumentation dielectric unions are for electrical isolation of sensitive electronics. Unlike dielectric unions for plumbing, they do not prevent corrosion on their own. They must be used in conjunction with an active corrosion mitigation system and should not be used to connect dissimilar metals.

Water heaterpressure relief valvefailure symptoms

The rectifier then cycles an electric current through the system causing electrolysis. This flowing electrical current replenishes the electrons that would normally be lost to oxidation. In doing so, it protects the cathode from the corrosion that it would naturally experience.

Ordinary dielectric unions are designed to reduce or eliminate the corrosive effects of electrolysis. Electrolysis happens when water (or any other electrolytic liquid) is passed through a system that consists of two or more dissimilar metals.

Dielectric Unions are a crucial tool used to greatly reduce the effects of corrosion in a plumbing network. A dielectric union used in instrumentation is similar to a dielectric connector that might be on top of a hot water heater. There are, however, a few key differences.

Instrumentation dielectric unions are not designed to prevent the natural electrolysis between varying types of metals. Rather, they provide a barrier between sensitive electronics and the electrical current that must pass through the cathode (the component requiring protection). Connecting metering or testing equipment directly to the electrified cathode could cause false readings or equipment damage and failure.

This process begins with a piece of material (referred to as the anode) that is buried in the ground near the component that requires protection (referred to at the cathode). Both the anode and cathode are connected to a machine called a rectifier.