BS 6864-4:1987

National foreword
Committees responsible
Method
0 Introduction
1 Scope and field of application
2 References
3 Mounting and operating conditions
4 Test report
Annexes
A Low-noise flow resistances with calibrated flow-rates
B Adaptors for the connection of low-noise flow
   resistances with calibrated flow-rate
C Adaptors for the connection of outlet fittings
Tables
1 Internal dimensions of standard test cisterns
2 Flow pressures for testing flushing valves
3 Length and number of tubes required for flow
   resistances with calibrated flow-rate
4 Dimensions of adaptors with an outside thread (A1)
5 Dimensions of adaptors with an inside thread (A2)
6 Dimensions of adaptors with an outside thread (A3)
7 Dimensions of adaptors with an inside thread (A4)
Figures
1 Device for connecting outlet fittings to the
   horizontal test pipe
2 Flow resistance with calibrated flow-rate (R)
3 Arrangement of the tubes for resistances BS 6864 -
   R 25 and BS 6864 - R 33
4 Arrangement of the tubes for resistances BS 6864 -
   R 42 and BS 6864 - R 50
5 Arrangement of the tubes for resistance BS 6864 -
   R 63
6 Adaptor with an outside thread (A1) for the
   connection of low-noise flow resistances with
   calibrated flow-rate
7 Adaptor with an inside thread (A2) for the
   connection of low-noise flow resistances with
   calibrated flow-rate
8 Adaptor with an outside thread (A3) for the
   connection of outlet fittings
9 Adaptor with an inside thread (A4) for connection of
   outlet fittings

For appliances which cannot be regarded as draw-off taps or in-line valves or similar appliances. Applies to nominal size not exceeding 1 or DN 25.