Gereg Sewage and Water
Equipment (Pty) Ltd. was
established in 1988 to market sluice gates and other fluid control
1990 we acquired from Valvemakers the manufacturing and marketing rights
for the well-known FULTON range of sluice gates, which were first
manufactured in 1965, and of which we are now the sole suppliers.
Strict Quality Assurance and Control in accordance with the requirements
of ISO 9002 (SABS 0157 part II) is practiced during manufacture, and
robustness of design and high Manufacturing standards are not
compromised for the sake of cost reduction, resulting in a range of
products of exceptional quality.
Gereg Factory in Labore, BRAKPAN,
4m wide x 2,6m
high mild steel stop gate for 13m unseating head
Final assembly of
a batch of Channel Gates
Case Studies : 4.2m
wide x 3,5m high Channel Gate with electric actuator
(Johannesburg Northern Works, R.S.A.)
Various types of
operating gear as shown above
Pedestal on wall support bracket
Bevel gearbox on pedestal
Hydraulic or pneumatic actuator
Electric actuator on pedestal
Platform mounted pedestal with handwheel
Tee-key on support bracket
sluice gates (penstocks) are used to close
off an opening in a wall, often between adjacent tanks or chambers, as
well as outlets in dam walls.
The most common type of seals are Neoprene "music note" or "J" seals,
and as it is not possible to utilize these seals on circular gates, all
our sluice gates have square or rectangular openings.
Water pressure forces the bulb of the seal against the sealing
surface on the frame, and the higher the pressure, the greater the
force. To cater for off-seating pressures, the seals are reversed, so
that the bulb is still forced against the frame, and in cases where both
seating and off-seating pressure conditions occur, double seals, one in
the normal, and one in reverse configuration, are used.
The invert seal is either of the "J" type, for standard invert, or is
rectangular, for flush invert. The latter is recommended for use in
sewage and other applications where the fluid contains grit, sludge,
etc., as no "pocket" occurs across the invert.
We can also fit non-resilient (metal or thermoplastic) seals to
wall-mounted sluice gates, if specially required, and to ensure
effective sealing, adjustable wedges would be used.
We strongly recommend using rising spindles wherever possible, since
the threaded section, as well as the thrust arrangement, are at the top,
out of the fluid. Unless their use is essential, non-rising spindles
should be avoided, so obviating possible clogging of the threads.
Various operating gear options for sluice gates are described under
Tilting weirs are used for wide openings where the vertical
travel required is not more than about 500 mm. The gate is hinged at
the bottom, and is raised and lowered by means of a centrally
mounted spindle which can be operated either manually, or by an
actuator. As friction is very low, operating effort for tilting
weirs is minimal.
Sealing plates can be fitted to the end walls if required, whilst
a flat Neoprene seal across the width of the weir prevents leakage
along the hinged section.
Scum baffles, located upstream of the weir, are optional.
Weir and Downward-Opening Weir
Twistlock gates are used in the same applications as
small wall-mounted sluice gates, where hand operation is acceptable.
They can be locked in any partially open position by twisting the
handle, which brings a cam into play, forcing the gate against its
frame. This same action seals the gate in its closed position.
Twistlocks are suitable for balance heads up to 3m seating or 2m
unseating, but it must be borne in mind that operating effort increases
with size and pressure.
Usually of cast iron construction with bronze seating faces, they can
also be cast in stainless steel, or fabricated from stainless,
corrosion-resistant or mild steel.
Bore size available for the cast range from 100 to 300 mm.
Telescopic Bellmouth Valve /
Sludge Valve /
Ground Water Pressure Relief Valve /
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