Category Archives: Encyclopaedia

Equilibrium ball valve

An equilibrium ball valve is a type of ball valve which utilises the pressure of the incoming water to help close the valve. Contents – equilibrium ball valve Overview Types Overview In a standard ball valve, the incoming water enters … Continue reading

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Polytank feed and expansion tank (4 gallon/18 litre)

The Polytank feed and expansion tank is a feed and expansion tank produced by Polytank Group Ltd, the British manufacturer of water tanks and cisterns. As the name implies, the tank is designed to be used as a feed and expansion … Continue reading

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Surestop stopcock

A Surestop stopcock is a stopcock produced by Surestop Ltd, a UK company which specialises in making easy to use stopcocks that are designed to prevent water damage to properties. Unlike traditional brass-handle stopcocks which may leak or jam, Surestop … Continue reading

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Tank bung

A tank bung is a bung used for blocking a cistern outlet, such as the outlets on a cold water storage cistern. Typically available in 15 mm, 22 mm, and 28 mm sizes, a tank bung consists of a plug made out … Continue reading

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Croydon ball valve

A Croydon ball valve is a ball valve which consists of a piston inside a brass housing, with a float arm secured to the valve via a brass split pin. On the end of the float arm is a plastic … Continue reading

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Part 3 ball valve

Check Part 3 ball valve prices at B&Q Side entry Part 3 ball valve Bottom entry Part 3 ball valve A Part 3 ball valve or diaphragm ball valve is a ball valve made to British Standard specification 1212, Part 3. It consists … Continue reading

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Hot water cylinder

The hot water cylinder, often referred to as the hot water tank, is a vessel designed for heating and storing hot water for use in the home. It is typically made out of copper, and has a concave base for structural integrity. The … Continue reading

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Broken coil

A broken coil refers to a fault in a hot water cylinder in which the coil inside the cylinder is perforated, allowing water from the central heating circuit inside the coil to mix with water in the hot water cylinder. Overview … Continue reading

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Tank connector

A tank connector or tank coupler is a fitting which connects a pipe to a cistern, allowing water to be drawn from the cistern, and in some circumstances, allowing water to enter it. Tank connectors are typically found on cold water storage cisterns and … Continue reading

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Part 2 ball valve

A Part 2 ball valve or diaphragm ball valve is a ball valve made to British Standard specification 1212, Part 2. It consists of a plunger and a diaphragm washer which are both situated inside a brass housing. The plunger is … Continue reading

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