CLAMSHELL GATE
PEBCO® uses industrial
hydraulic actuators that are of heavy-duty construction and are ANSI dimensional
interchangeable.
Over the years, better than 90% of the clamshell
gates manufactured by PEBCO® have been built with the quadrant
gear timing design. This design was selected for the following reasons:
- A lower initial cost due to the simplicity of
the components used and method of attachment of the quadrant gear sections to
the gate blades.
- Once the gear sets are located and properly
timed, they are welded in place eliminating any further adjustment or need for
maintenance.
- Because of their low operating speed and low
stresses seen by the gear teeth during operation, lubrication of the teeth is
not required.
- The assembly and reassembly of the gate can
be accomplished without affecting timing of the gate
blades.
PEBCO®
Clamshell Valve Features Include:
- Construction is of minimum 1/4" mild steel
plate, heavily reinforced where necessary. Bolting flange is constructed of
heavy structural steel angle. All welding is per AWS standards.
- Gate pivot shafts are C-1045 steel shafting,
and are attached to heavy backing plates welded to the gate body.
- Regreasable bushings are located at the four
pivot points attached to the gate radius plates. Bushings are easily
regreasable via pressure lubrication fittings located on the pivot shaft
ends.
- Duplex clamshell design incorporates timing
gear sectors at each of the four pivot points. This configuration assures
smooth, even actuation of both clamshell halves.
- Gate valve flange includes our standard
bolthole pattern.
- Actuation is by two heavy-duty,
pivot-mounted, double acting pneumatic cylinders, constructed to ANSI
specified dimensions for interchangeability. Cylinders include hard chrome
plated rods, and long-wearing, double seal configurations. Cylinder rods are
clevis-mounted to the gate blades. Cylinders are sized for actuation at a
minimum of 80 psig clean plant air.
OR
- Actuation is by two heavy-duty, pivot-mounted
hydraulic cylinders, constructed to ANSI specified dimensions for
interchangeability. Cylinders include hard chrome plated rods, long-wearing,
double seal configurations, and heavy steel cylinder tubes. Cylinders are
clevis-mounted to the gate blades. Cylinders are sized for actuation at 1500
psi hydraulic pressure.
OPTIONAL
EQUIPMENT:
- Add for material contact surfaces to be lined
with abrasion resistant steel - 360 BHN.
- Add for a directional control valve mounted
to the gate housing and piped to the cylinders.
- Add for each pair of limit switches mounted
to the gate housing for remote open/close position
indication.
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