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A pressure surplus/sustaining valve maintains a minimum set pressure upstream of the valve, catering for fluctuations in pressure on either side of the value. This is achieved by the valve gradually opening or closing to maintain a set pressure. Broady Flow Control Ltd has a wide range of pressure surplus/sustaining valves which are listed below. Click on the picture of the valve you require to be taken to its item description. Further information about our other surplus/sustaining valves which are not listed below, including the Type AB, Type W1 and Type WR, can obtained by contacting our sales team on +44 (0)1482 619601 or by emailing

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