High-Pressure Mixer Valves:Some valves are designed for use on pumped gravity and mains fed water systems only. If the minimum pressure is 1bar, then, high-pressure valves are usually designed be restrictive and provide better flow control and temperature at the higher pressures. Rates of flow more than 20ltr/min are achievable, it depends on the mixer design and water pressure.General-Purpose Mixer Valves:There are mixer valves built to work on all plumbing types, like balanced gravity systems from 0.1-1bar and pressurised systems more than 1bar. There are general-purpose mixers that are recommended for connection to mains fed cold-water and gravity fed hot water. But, an imbalance of pressure outside the ratio stated by the manufacturer could give rise to fluctuations in shower temperature. To comply with water regulations, check valves must be present in both supplies to prevent cross flow through the mixing valve. Dalston Plumbers fit all plumbing valves.Power Shower:This is often thought to be the best in exhilarating shower performance, using high-pressure spray or sprays from a gravity fed water supply and a pump to boost the flow. The pump can be part of the shower unit or a separate pump and mixer valve. Low pressure mixer valves are built for use on a gravity fed system if pressures are between 0.1-1 bar. When dealing with a lower-pressure installation, all restrictions like elbow joints and bends, should be kept to a minimum. A Dalston Plumber can fit all showers. In some cases, to reach the required minimum running pressure at the valve, the cold water cistern might need to be raised in height or use larger pipes and fittings. This will reduce loses due to friction. Due to the difficulties in moving a cold-water cistern, it is more common to increase gravity system pressure by fitting a boost pump.
