AFL - Automatic Flow Limiting Valve

Every water outlet or appliance shall have a combined Isolating and Automatic Flow Limiting Valve to automatically limit the flow of hot and cold water as manufactured and distributed by Arrow Valves Ltd - Tel 01442 823123 www.arrowvalves.co.uk.  A flow limiting cartridge1 shall be installed through the side port - after fitting and flushing pipes in accordance with the BS6700 Table 3.  The Cartridge flow rate shall be as indicated in the table below and a colour coded identity disc fitted after installation of the Cartridge.  The valves shall be nickel-plated and fitted with a black aluminium lever. 

Insert as required
  1. “incorporating a 650 micron strainer”.
  2. The valve assembly shall incorporate a double check valve assembly (ED device).
  3. The valve assembly shall incorporate a single check valve assembly (EA device).

 

Recommended Flow Rates - Based on BS6700
Appliance

Lt/s

Colour

 Hand basin / Washbasin

0.13

White

 Kitchen Sink G1/2"

0.17

Yellow

 Kitchen Sink G3/4"

0.25

Blue

 WC Flushing Trough (per jet)

0.13

White

 Shower (Typical, not "power shower")1

0.17

Yellow

 Bidet

0.10

Grey

 Bath G3/4"

0.25

Blue

 WC Cistern (New 6 litre)

0.10

Grey

 WC Cistern (Old 7.5 litre)

0.13

White

 Washing Machine1

0.20

Brown

 Dishwasher1

0.13

White

Note - 1.  The manufacturer should be consulted for required flow rates

 

Autofill – Pressurisation Unit

The primary sealed heating system shall be filled and pressurised by an Autofill pressurisation unit as manufactured and commissioned by Arrow Valves Ltd - Tel 01442 823123.  Warning neon lamps shall be provided on the unit, which indicate a low or high pressure fault condition.  A solenoid valve shall control the filling and be controlled by a differential pressure switch1.  Installation shall comply with WRAS IGN 9-03-02 as available on the manufacturer’s web site www.arrowvalves.co.uk.  The base of the cabinet must be 300 – 1500 mm above the floor and adequate access shall be provided for testing.  A discharge pipe must be connected to the tundish and taken to a gully.  Where the discharge is to be taken into a waste pipe, a waterless trap shall be used.  The assembly must be commissioned prior to use in accordance with the Water Regulations. 

Insert as required
  1. A booster pump module shall be fitted upstream of the Autofill unit, which can supply up to 10 Bar pressure with a flow limited to less than 0.2 l/s.

BA / RPZ – Reduced Pressure Zone Valve

Where indicated on the drawing, a Reduced Pressure Zone assembly shall be installed as manufactured and commissioned by Arrow Valves Ltd - Tel 01442 823123.  The installation shall comply with WRAS IGN 9-03-02 as available on the manufacturer’s web site www.arrowvalves.co.uk.  The strainer1 shall be contained in a serviceable spherical valve and a non-return valve shall be provided upstream of the RPZ valve to minimise discharge.  The base of the valve must be 300 – 1500 mm above the floor and adequate access shall be provided for testing with a minimum 150 mm clearance above the valve.  The assembly shall be installed in a tamperproof environment such as a plant room or be located in a cabinet.  A discharge pipe must be connected to the tundish and taken to a gully.  Where the discharge is to be taken into a waste pipe, a waterless trap shall be used.  The assembly must be commissioned prior to use in accordance with the Water Regulations. 

Insert as required
  1. shall have a 100 micron mesh and  self clean at weekly intervals by means of an electrical actuator.

BTABV – Break Tank & Booster Set

Where indicated on the drawing, a Break Tank Assembly with a Type AB air gap shall be installed as manufactured by Arrow Valves Ltd - Tel 01442 823123 www.arrowvalves.co.uk.  The unit shall have an 18 litre cistern, with a lid, screened weirs and overflow according to Water Regulations G16.13.  The pump shall be centrifugal with stainless steel impellors and housing with an input power of 700 W and 3.3 Bar closed valve head1 and be controlled by a pressure switch connected to a 20 litre pressure vessel.  The cistern level shall be controlled automatically by a servo solenoid valve operated via stainless steel conductive level probes and controller.  The unit shall be floor mounted on a steel base plate and acoustically attenuated with anti-vibration feet and a stainless steel braided flexible hose from the pump. 

Amend as required
  1. 500 W and a closed valve head of 2.2 Bar
  2. 900 W and a closed valve head of 4.5 Bar
  3. 1200 W and a closed valve head of 5.7 Bar

BTP – Vandal Resistant Hose Union Tap

Where indicated on the drawing, a heavy pattern Hose Union Tap with integral wall plate and copper tube shall be installed as manufactured by Arrow Valves Ltd - Tel 01442 823123 www.arrowvalves.co.uk.  The tap shall be of the Ferrule Guard and Key operation.  The plate shall be robustly attached to the wall.  A separate Double Check Valve Assembly (Type ED) shall be fitted inside the thermal envelope of the building, which is suitable for fluid category 3 protection.  The required level of backflow protection shall be determined by the local water supplier. 

ED132 – Double Check Valve

Every Double Check Valve assembly shall be the low head loss type as manufactured and distributed by Arrow Valves Ltd - Tel 01442 823123 www.arrowvalves.co.uk.  The pressure drop across the assembly at 3 m/s pipe velocity shall be less than 1.3 m.  The body shall be DZR brass and include flat-faced union connections.

ED316 – Double Check Valve

Every 15 mm Double Check Valve assembly shall be the low head loss type as manufactured and distributed by Arrow Valves Ltd - Tel 01442 823123 www.arrowvalves.co.uk.  The pressure drop across the assembly at 3 m/s pipe velocity shall be less than 1.3 m.  The body shall be 316 stainless steel and Mapress press-fit union connections or plastic with flat-faces shall be used.

ED440 – Double Check Valve

Every Double Check Valve assembly shall be the low head loss type as manufactured and distributed by Arrow Valves Ltd - Tel 01442 823123 www.arrowvalves.co.uk.  The pressure drop across the assembly at 1.5 m/s pipe velocity shall be less than 3.5 m.  The body and compression connections shall be DZR brass.

FB – Filterball

Where indicated on the drawing, an isolating ball valve with integral strainer shall be installed as distributed by Arrow Valves Ltd - Tel 01442 823123 www.arrowvalves.co.uk.  The strainer shall be stainless steel with a 700 micron1 mesh.  The body shall feature a side port, which allows the strainer to be removed whilst isolating both valve ports.  The connections shall be compression to BS684-2.

Amend as required
  1. 300 micron

PRV533 – Pressure Reducing Valve

Where indicated on the drawing, a Pressure Reducing Valve shall be fitted as distributed by Arrow Valves Ltd - Tel 01442 823123 www.arrowvalves.co.uk.  The PRV shall be direct acting and have an adjustable outlet pressure ranging from 1 – 6 Bar and have a maximum supply pressure of 16 Bar.  The design shall be of the removable cartridge type with integral 800 micron strainer.  A pressure gauge shall be provided to indicate the downstream pressure.  The PRV shall feature servicing valves to enable strainer to be cleaned.

PRV536 – Pressure Reducing Valve

Where indicated on the drawing, a Pressure Reducing Valve shall be fitted as distributed by Arrow Valves Ltd - Tel 01442 823123 www.arrowvalves.co.uk.  The PRV shall be direct acting and have an adjustable outlet pressure ranging from 0.5 – 6 Bar and have a maximum supply pressure of 25 Bar.  The pressure drop from a nominal 4 Bar shall be less than 0.8 Bar @ 2 m/s pipe velocity.  The design shall be of the removable cartridge type with integral 500 micron strainer.  A pressure gauge shall be provided to indicate the downstream pressure.  The body shall be DZR brass with union connections suitable for copper tube.  The PRV shall feature full-bore DZR servicing valves to enable strainer to be cleaned.

PRV1300 – Pressure Reducing Valve

Where indicated on the drawing, a Pressure Reducing Valve shall be fitted as distributed by Arrow Valves Ltd - Tel 01442 823123 www.arrowvalves.co.uk.  The PRV shall be direct acting and have an adjustable outlet pressure ranging from 2.0 – 6 Bar1 and have a maximum supply pressure of 25 Bar.  The pressure drop from a nominal 4 Bar shall be less than 0.7 Bar @ 2 m/s pipe velocity.  The valve shall have an integral 1000 micron strainer.  A pressure gauge shall be provided to indicate the downstream pressure.  The body shall be gunmetal with union connections suitable for copper tube.  The PRV shall feature full-bore DZR servicing valves to enable strainer to be cleaned.

Amend as required
  1. 0.5 – 2.0 Bar
  2. 6.0 – 10.0 Bar

SPBA – Standpipe Assembly

Every external hose union tap shall be located in a tamperproof housing; comprising of a galvanising steel body, with a dark green epoxy coating as manufactured and distributed by Arrow Valves Ltd - Tel 01442 823123 www.arrowvalves.co.uk.  The unit shall be suitability of fluid category 4 protection and feature an RPZ valve (BA device).  When mounted in soft ground a galvanised pile shall be used with stainless steel fasteners.  No below ground connections shall be made and a 2-pipe Tee Assembly installed in the lower part of the standpipe where the pipe is to continue.  The tap outlet shall have a barbed connector with o-ring seal1.  A padlock shall be provided and the supply pipe insulated.  Note - The required level of backflow protection shall be determined by the local water supplier. 

Amend as required
  1. shall have a full–bore quick release brass plug and socket arrangement.

SPED – Standpipe Assembly

Every external hose union tap shall be located in a tamperproof housing; comprising of a galvanising steel body, with a dark green epoxy coating as manufactured and distributed by Arrow Valves Ltd - Tel 01442 823123 www.arrowvalves.co.uk.  The unit shall be suitable for fluid category 3 protection and feature a Double Check Valve Assembly and full-bore spherical servicing valve.  When mounted in soft ground a galvanised pile shall be used with stainless steel fasteners.  No below ground connections shall be made and a 2-pipe Tee Assembly installed in the lower part of the standpipe where the pipe is to continue.  The tap outlet shall have a barbed connector with o-ring seal1.  A padlock2 shall be provided and the supply pipe insulated.  Note - The Standpipe is to be used for domestic purposes.  The required level of backflow protection shall be determined by the local water supplier.  

Amend as required
  1. shall have a full–bore quick release brass plug and socket arrangement.
  2. Combination padlock

TMV5212 – Thermostatic Mixing Valve

Every hot tap on a hand wash basin, bath and shower shall be supplied by a thermostatic mixing valve meeting the requirements of NHS model Engineering Specification DO8 (low and High pressure) as distributed by Arrow Valves Ltd - Tel 01442 823123 www.arrowvalves.co.uk.   The TMV shall feature servicing valves with a removable strainer and a single check valve.  Where the supply pressures are unbalanced, the AFL service valves shall also include a flow limiting cartridge that limits the flow in accordance with the manufacturer’s data.  The installation and commissioning shall be in accordance with the TMV 3 scheme, as available on the manufacturer’s web site.

WMZ – Water Meter

Every secondary water meter shall be the low head loss multi-jet turbine type as distributed by Arrow Valves Ltd - Tel 01442 823123 www.arrowvalves.co.uk.  The meter shall have a brass body and be epoxy coated.  The meter shall be class B and be suitable for temperatures up to 30o C.  Full bore spherical servicing valves with flat-faced union connections shall be installed either side of the meter.  The serial number shall be engraved into the housing and be visible when reading the dial.