Batescrew Non-Return
Flap Valves
click here for
Valve
& Flange Dimensions
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These
have stainless steel inclined seats, dual pivoting lids and
stainless main spindles with bronze bearings. They are equipped for the various mounting options, as seen
above. A grease nipple is
provided for lubrication of the main pivot.
Corrosion Resistance. Normal
construction is of mild steel, hot dip galvanised.
Stainless Steel, in grades 304L or 316L, may also be specified.
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Cable Operation.
Flaps may be equipped with a lever, for cable operation.. The
illustration shows an arrangement suitable for lifting from above. The
shape of the lever supplied will be varied to suit the cable angle
required. It is necessary to
indicate the approximate cable angle, or length and height dimensions,
from valve to the operator position, when ordering.
Design of the linkage arm varies, throughout the size range, to
suit the forces involved. |
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GROUTED.
These match the inside diameter of Class 2 concrete pipe.
Keying lugs welded to the spigot have a slight clearance within the
pipe and assist with aligning the valve while grout is applied. |
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WELDED.
A plain spigot, suitable
for welding directly to steel pipelines or headwalls, pipe fittings,
sumps, junction boxes etc. Spigots match commonly available steel
pipe, with outside diameters ranging from 317mm to 1841mm.
Larger sizes are made to order, as are ‘specials’ to fit
non-standard pipes. |
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ROLLED FLANGE.
Rolled flanges offer a lower cost alternative to flanges complying
with officially recognised standards.
They are rolled from flat mild steel bar and drilled for smaller
bolts at closer than normal spacing.
There is a cost saving in both flange material and bolts.
This type of flange has been well proven and is suitable for use to
ten metres operating head. They
will not connect to other industry standard flanges. |
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MODIFIED TABLE D FLANGE.
These provide connectability with other industry standard fittings,
while reducing flange thickness and bolt size, to values more appropriate
to the specified operating heads They have the same Pitch Circle
Diameter and number of bolts as specified in Australian Standard 2129
Table D. Valves fitted with
the modified flange may therefore be connected to other fittings which
have regular table D flanges, using the smaller bolts listed in the valve
dimension tables. |
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SQUARE FLANGE.
This is a common arrangement for attaching to headwall structures.
The valve is sealed
against the headwall, by a compressible gasket of bitumen impregnated
polyurethane foam. For
attaching to concrete structures, we recommend the use of stainless steel
chemical anchor bolts.
Each valve is supplied with an
installation kit comprising:
Gasket material, in 2M strips, contact adhesive.
Square washers.
Chemical anchor bolt kits, stainless nuts, instruction sheet.
Masonry drill bit to suit anchor bolt capsules.
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Stainless chemical anchor bolt. |
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CHEMICAL
ANCHOR BOLTS.
For concrete structures, holes of 14mm diameter are drilled, to a depth of
110mm. After cleaning the
holes, glass capsules, containing the correct ratio of epoxy resins, are
inserted. These will be
broken and mixed, when stainless studs are inserted. Mixing should be in accordance with the instruction sheet
supplied. The flange may be
used as a drill guide, before
fitting the gasket.
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 GASKET
MATERIAL
The gasket, attached
with contact adhesive, is
bitumen impregnated polyurethane foam, supplied in two-metre lengths, of
50mm square section. Bolts
are tightened until the gasket is compressed against the headwall, to a
thickness of approximately10mm.
Ends of a gasket should
be cut to an angle of 30°,
providing overlapping joints, which will come tightly together under
compression.
Gasket material and
adhesive are supplied with the installation kit. |
| Flap
Valve & Flange Dimensions. |
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