Glossary Of Terms


Anti-Ligature product such as our basin spouts and showerheads are most commonly used in healthcare and high risk settings. Anti-ligature products are used to eliminate ways for a cord, rope or bed sheet to be tied around a fixture to create a ligature point which can result in self harm or loss of life.

Anti-Scald Systems

In order to prevent the spread of Legionella bacteria, water in domestic and commercial applications must be stored at high temperatures. However, these temperatures can cause scalding when released from baths and showers at these temperatures and so we provide anti-scald systems such as our thermostatic mixing valves to prevent water at scalding temperatures from being released at tap outlets.

Backflow Prevention

Backflow prevention devices are most commonly used in potable water supplies (water that could be consumed by humans) in order to protect water supply from contamination caused by backflow.

Ball Valve

Ball valves allow the plumbing to be shut off at specific outlets such as dishwashers or washing machines without having to shut off the full water supply to the building. This makes installing or servicing certain areas of the plumbing or appliances quicker and easier.

BS EN ISO 9001

This is a quality management system to help us continually monitor and manage our business which enables us to provide consistent performance and services at all times.

BS EN ISO 14001

This is an internationally accepted environmental standard and allows us to control, monitor and reduce waste and emissions whilst conforming with legal and regulatory requirements.


The BSI CE certification ensures that all of our products conform to European Directives and Regulations.

BSI Kitemark

The BSI Kitemark certification ensures that our products and services conform to particular standards and are subject to regular inspection to ensure continued conformity.


The BIMstore Library uses 3D modelling and information management systems to bring information about every element of a business together.

Build Cert

BuildCert is a Certification programme specifically for plumbing products. BuildCert is an independent UK testing organisation with over 75 years’ experience in the industry. It ensures that all of our products meet the same high quality standards.

CE Mark

A CE Mark is a mandatory certification to ensure that all products sold within the European Union conform to requirements and meet the same standards.

Continuing Professional Development (CPD) Seminars

Our certified Continuing Professional Development (CPD) Seminars are approved by The Construction CPD Certification Service. Our seminars are designed for consultants, specifiers and architects to help them understand our products and systems and their use in various applications.

Double Check Valve

Double check valves consist of two valves and act as a safety feature in any water supply that is likely to be consumed by humans. If one of the valves fails, the other will prevent backflow and contamination.

Expansion Vessel

Our expansion vessels are most commonly used in domestic hot water systems to protect from excessive pressure. As water heats up, it increases in volume and expansion vessels provide extra space within the system when the water is at full capacity.

Filling Loop

Filling loops are designed for boilers and used when the system needs to be refilled or repressurised from the mains water supply. The filling loop connects separately to the boiler and can be detached once used.

Heat Meter

A Heat Meter records data from heating and cooling system in order to measure energy consumption.

ISO 22301

The ISO 22301 is an international standard for business continuity and allows us to understand threats to our business. This protects our business and means that we can recover well from disruptive incidents.

Isolation Valve

Similar to a ball valve, an isolation valve allows the flow of water to be shut off at specific locations to allow ease of servicing and for safety purposes. Isolation valves are typically found under a sink in bathrooms or kitchens. Isolation valves are typically left open and the homeowner can control the flow of water using the tap above. However, if the tap needs replacing, an isolation valve needs to be turned off in order to temporarily suspend the flow of water.


Legionella is bacteria which can grow in water systems with low water temperature and which provides appropriate nutrients for the bacteria to thrive. The bacteria can cause legionnaire’s disease. At Reliance Water Controls, we specialised in temperature control products to store water at higher temperatures, prevent scalding and prevent the spread of legionnaire’s disease.


This model engineering specification ensures that thermostatic mixing valves used in care environments achieve a minimum performance standard in order to prevent scalding in these environments.

Pressure Gauge

A pressure gauge is used to measure the pressure of gas or liquids within a system.

Pressure Reducing Valve (PRV)

Pressure reducing valves are used in plumbing in order to reduce the pressure from the mains water supply to make it suitable for use in a domestic or commercial water system.


SharkBite plumbing fittings are manufactured in Australia by Reliance Water Controls. SharkBite’s push-fit plumbing fittings provide leak-free solutions for plumbing across the world.

Single Check Valve

A single check valve protects plumbing systems from backflow and contamination to prevent health problems from drinking water. These valves may allow more backflow through the system before closing the supply off.

Tempering Valve

Tempering valves mix cold and hot water from a heating system together to ensure that the water delivered at each outlet is at a constant temperature. The valve can be adjusted to the required temperature and includes a temperature sensitive element which can adjust the water flow depending on the temperature.

Thermal Balancing Valve

These valves are typically used in circulating hot water systems. Thermal balancing valves regulate the flow of water within a system depending on the temperature.


Thermostats are used in heating systems to keep the water at a desired temperature. An element is placed within the system and, when it senses the water temperature dropping, the element is heated to maintain the temperature.

Thermostatic Mixing Valve

A valve that blends hot and cold water in order to maintain safe and constant temperatures in showers, taps and bath outlets to prevent scalding. These valves are used in educational, healthcare and domestic settings.

TMV2 Approved

The TMV2 scheme provides approval for the domestic thermostatic sector. The scheme became part of building regulations in England and Wales in order to control the hot water temperature in domestic bathrooms in order to prevent scalding.

TMV3 Approved

The TMV3 scheme is similar to the TMV2 scheme however; it applies to the healthcare and commercial thermostatic sector. As the basis for testing, this scheme uses the NHS specification, D08.


A Tundish acts as a safety device for pressure and temperature relief valves. It acts as an indicator of a fault within the system and prompts the occupants of the building to seek professional help.

Unvented Hot Water System

Unvented hot water systems are pressurised systems which are fed directly from a cold water supply allowing them to deliver hot water at mains pressure, greatly improving the performance of bath and shower systems.

Water Meter

Water metres measure how much water is used within a property in order to allow water and sewerage services to know how much to charge depending on how much water has been used.

The Water Technology List

The Water Technology List is a Government list which promotes products encouraging sustainable water use and rewards businesses for investing in them through the Enhanced Capital Allowance scheme.


A WRAS product certification means that the products supplied are of a high quality keep water safety in mind at all times. Any water fittings that are designed to be used in the mains water supply must comply with regulations to ensure that the water supply is not contaminated. These regulations ensure that any water fitting which receives water from the UK public mains water supply does not cause waste, misuse, undue consumption or contamination.