FLAT VALVES

WATER

PROCESS / INDUSTRIAL

OIL / GAS

The Flow Control Group design, manufacture and install a complete range of Decanting Arms for a wide range of applications in the water, wastewater, and industrial process sectors.

The specification and selection of a Decanting Arm and its operating protocols is essential to its optimum performance.

The Flow Control Group are one of Europe’s leading manufacturers of specialist flow control equipment.

We design, manufacture and install a range of products including penstocks, flap valves, stop logs, floating arms, hydrostatic valves and specialist knife gate valves.

The Group also design and manufacture a complete range of operating equipment including valve mounting kits, extension spindles, pedestals, locking devices, chainwheels and handwheels.

Flap valves are primarily used for surface water drainage to prevent reverse flow. They are installed on rivers, estuaries and seawater outfalls. Flap valves can also be used on final effluent outfalls for sewage treatment plant to prevent flood damage within the works.

Flap valve application on sea water outfalls should be given careful consideration due to turbulence of flow across the flap, particularly when severe wave action is involved, resulting in dislocation of the flap relative to its seals.

Flap valves can be supplied for wall, flange or thimble mounting applications. We can supply both single door type and double door valves.

Materials of construction include Ductile Iron, Stainless Steel, Duplex, and HDPE

Specification Ductile Iron

Frames shall be formed from ductile iron. The minimum grade for the iron will be BS1452-BSEN 1561 GJL 250. The frames will be suitable for grouting and bolting to vertical walls and fixing to flanged pipes with a % of fixing holes in a PN16 flange.

The seating side of the frame will have a mechanically fixed phosphor bronze seal. The phosphor bronze will be to BS1400 PB2 and be complete with a sufficient amount of special phosphor bronze taper screws. The seal will be machined and finished to the non-acceptance of 0.0025” (0.06mm)

 Doors shall be formed from close grained cast iron. The minimum grade for the iron will be BS1452-BSEN 1561 GJL 250. The seating side of the door will have a mechanically fixed phosphor bronze seal. The phosphor bronze will be to BS1400 PB2 and be complete with a sufficient amount of special phosphor bronze taper screws. The seal will be machined and finished to the non-acceptance of 0.0025” (0.06mm)

Hinge pins will be of stainless steel grade 316 BSEN10088-2 (1.4401/1.4404) and be complete with 2No securing split pins 316 BSEN10088-2 (1.4401/1.4404). The flap valve will be of the double hung type. The hinge links will be phosphor bronze n BS1400 PB2  of suitable size to suit the duty.

 The Flap valves shall be capable of both operating and withstanding the working heads. Maximum leakage will be 1.25 litres/min/seal perimeter at 4m head.

Installation of the Flap valves will be by electro zinc plated mild steel BS 7371-8:2011 or stainless steel grade A4 BSEN10088-2 (1.4401/1.4404) expanding/resin anchors. If considered necessary by the client’s representative a leakage test shall be undertaken at the maximum specified head.

Ductile Iron parts will be coated in-accordance with the following

Blast clean SA2½.

Two pack epoxy 250 microns DFT- black.

Specification Fabricated Flap Valve

Frame shall be frame manufactured from welded rigid mild steel sections to mild steel grade 43A BSEN 10025:S275 JOH 1997/J2H 1994, stainless steel grade 304/316 BSEN10088-2 (1.4301/1.4307-1.4401/1.4404) and shall have removable stainless steel 304/316 BSEN10088-2 (1.4301/1.4307-1.4401/1.4404) double hung hinge bracket.

Hinge links will be of stainless steel grade 304/316 BSEN10088-2 (1.4301/1.4307-1.4401/1.4404) and be complete with phosphor bronze BS1400 PB2 fitted bushes. The flap valve will be of the double hung type. The hinge links will be 304/316 BSEN10088-2 (1.4301/1.4307-1.4401/1.4404) and will be of suitable size to suit the duty.

The seating side of the frame shall have resilient EPDM seals to BS681-1 to the sides and soffit, seals shall be mechanically fixed with stainless steel grade 316 BS EN ISO 3506 pt1-2 fasteners, and poly ethylene retaining strips BS ISO 15527:2010, so the seal can be removed with the Flap Valve in situ.

The door shall be manufactured from stainless steel grade 304/316 BSEN10088-2 (1.4301/1.4307-1.4401/1.4404) and shall comprise a main sealing plate with hollow section reinforcing matrix welded to the off-seating side of the plate.  All matrix section joints shall be fully welded and sealed. The door shall be provided with a suitable lifting lug. The lug shall be welded to the bottom of the door to enable connection of a proprietary lifting device.

Installation of the Penstocks will be by electro zinc plated mild steel BS 7371-8:2011 or stainless steel grade A4 BSEN10088-2 (1.4401/1.4404) expanding/resin anchors. Following installation final adjustment and initial lubrication is to be undertaken and the door operated through one cycle (or as recommended by the manufacturer). If considered necessary by the client’s representative a leakage test shall be undertaken at the maximum specified head. The maximum allowed leakage will be 0.5 litres/hour per metre of door seating perimeter. 

Mild steel parts will be coated in-accordance with the following:-

Blast clean SA2½.

Galvanise to BS729 and or ‘T’ wash

Two pack epoxy 150 microns DFT. – black.

Stainless steel self colour, the stainless steel should be cleaned after fabrication by approved methods.

FLAP VALVES

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FABRICATED WALL MOUNTED TYPE FLAP VALVES

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DUCTILE IRON WALL

    WATER DIVISION

    Unit 1 Mount Street Business Park
    Mount Street Nechells
    West Midlands
    B7 5QU

    Tel: 0121 752 8870
    Email: sales@cotswoldvalves.co.uk

    Oil and Gas Division

    Cooper Drive
    Springwood Industrial Estate
    Braintree Essex
    CM7 2RF

    Tel: 01376 321211
    Email: sales@flowcontrol.co.uk

    Industrial Process Division

    Cambridge Mills Cambridge
    Nr Dursley
    Gloucestershire
    GL 2 7AA

    Tel: 01453 826612
    Email: info@cotswoldvalves.co.uk