Part 1 ball valve: what is it & how does it work?

A Part 1 ball valve or Portsmouth ball valve is a ball valve made to British Standard specification 1212, Part 1. It consists of a piston inside a brass housing, with a float arm secured to the valve via a split pin. Inside the piston is a slot which accommodates the end of the float arm, and on … Read more


An overflow is an important part of a cistern, and serves two purposes in the event of a fault: to take away excess water in order to prevent structural damage to a property, and to indicate to the homeowner that there is a problem – in most cases, a faulty ball valve. An overflow pipe which exits … Read more

Ball valve: what is it & how does it work?

A ball valve or float valve, or less commonly, a ballcock, is a valve which controls the flow of water into a cistern via a plastic or metal float on the surface of the water. When water is drawn out of the cistern, the float falls with the water level. This opens the valve and causes water to … Read more

Ball valve repair kit

A ball valve repair kit is a repair kit which contains multiple types of spare parts for ball valves. A kit will typically include split pins, high and low pressure valve seatings, washers for Part 1 ball valves, and diaphragms for Part 2 ball valves. Ball valve repair kit overview A leaking ball valve is often … Read more

Essex flange

An Essex flange is a fitting on a hot water cylinder which prevents a device, such as a shower pump, from being damaged by air. It does this by drawing off water from the side of the cylinder. When water in the cylinder is heated by the coil or the immersion heater, air bubbles form. The top … Read more

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