Vertical travel of the door is guided by four bronze rollers, following tracks in the side channels. Resilient seals on the door make contact with three sides of the square spigot, and across the sill plate.
Wear is minimised and winding effort reduced, by the cam-following arrangement of the rollers, which, on closing, wedge the door tightly against the seats. On opening, the opposite action quickly separates seal from seat, giving unrestricted movement once the initial contact is broken.
For complete drainage, the sill plate is set level with the floor of the pond.
The standard valve has a handwheel, for manual operation
only. A special screw
mechanism, developed by BATESCREW and widely used within the Australian irrigation
industry, has a
jam-resisting 'Acme' thread, machined from grade 304 stainless steel, with a grease lubricated bronze nut and ball thrust
bearing. This mechanism is fully enclosed in a
The handwheel is non-rising, due to the telescopic control assembly, the screw does not protrude above the wheel, thus giving a full-turn winding capability. This allows rapid winding of the handle, once the valve has been cracked open.
Handwheels may be made removable, by discarding one bolt in the centre of the wheel.
For deep installations, Spacer Columns are provided, bringing
actuators or handwheels to any desired level. The
top of an extended column should be clamped to a headwall or other
supporting structure. Very long columns should have at least one intermediate
support clamp. When
ordering, please specify required dimension, from sill plate of valve to
centre of handwheel or actuator.
All necessary clamp fittings, including spacers, washers, chemical anchor bolts with data sheet, and a suitable masonry drill bit, are provided with each valve.
Avoid bending the column when fitting the support clamps. Use additional shims if necessary.
Valves with remote control should be capable of on-site isolation from the controller, and equipped with a manual winding capability. BATESCREW supply a range of suitable systems.
The various types of power head have differing requirements for the mounting flange and length of control thread, this information is therefore needed, prior to manufacture of the valve.
SEWERAGE VALVE SIZES & PRESSURE
Static head pressure ratings are expressed as on-seating
and off-seating pressure, off-seating being pressure applied to the valve from
the headwall side.