Pipe Interrupter
Part Number: DC257
Product Overview
DC Pipe Interrupters provide Fluid Category 5 backsiphonage protection (vacuum on the supply).
Model DC15C257 is primarily for urinals – enabling flushing directly from the mains supply. Traditional flushing cisterns are not required. Model DC20F257 fits to an outside tap. A short (600 mm max) unrestricted hose can be fitted for washing chemical toilets and similar Fluid Category 5 applications.
DC Pipe Interrupters are intended for open outlet applications (e.g. urinal flushing) and must not be used for washing machines, upstream of hose union taps or any appliance that has a control valve or restriction. Negligible restriction should exist downstream - otherwise water would discharge ultimately through the vent hole.
Specification Clause
DC15C257
Every urinal shall be fitted with a DC Pipe Interrupter, suitable for Fluid Category 5 backsiphonage protection – model DC15C257 - as manufactured and distributed by Arrow Valves Ltd – Tel 01442 823123 www.arrowvalves.co.uk. The device shall be fitted at least 1 m above the urinal bowl. No valves or restrictions shall be fitted downstream of the device. Allowance should be made for some discharge to occur from the Pipe Interrupter’s vent hole. The installation shall be tested and adjustments made as necessary to avoid discharge from the vent hole. The body of the device shall be chrome plated brass with 15 mm compression connections.
DC20F257
Every Hose Union Tap shall be fitted with a DC Pipe Interrupter, suitable for Fluid Category 5 backsiphonage protection – model DC20F257 - as manufactured and distributed by Arrow Valves Ltd – Tel 01442 823123 www.arrowvalves.co.uk. The device shall be fitted with a short unrestricted hose (600 mm max) and shall be installed at least 150 mm above the outlet. No valves or restrictions shall be fitted downstream of the device. Allowance should be made for some discharge to occur from the Pipe Interrupter’s vent hole. The installation shall be tested and adjustments made as necessary to avoid discharge from the vent hole. The body of the device shall be brass with a DN20 female inlet to fit a 15 mm outside tap.
Application
15 mm - urinal flushing, where the DC device allows mains or boosted water to flush the urinal bowl without a cistern.
DN20 – rinsing effluent containers – screw to outlet of outside tap. A short, unrestricted hose may be fitted.
Additional Resources
Tutorials:
• Washroom
• Showers, Baths & Bidets