Batescrew Sewerage Valve
Features                    

SEALING
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.

HANDWHEEL CONTROL.  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 dustproof housing
The inner control tube is in compression when closing the valve, any tendency to buckle is prevented by the outer casing, an essential feature on very long columns.
The system is capable of exerting intense pressure, therefore levers should not be used.

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.

 
EXTENDED COLUMN.  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.

POWER ACTUATORS
Various types of power actuator are available.  In all cases it is necessary to limit torque on the control thread to 860 Nm, or the equivalent of the effort of one man on a 500mm diameter handwheel.

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 RATINGS
Standard sewerage valves are available in sizes ranging from 300mm to 1800mm.

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.
The following table gives nominal size (mm) and on-seating /off-seating pressure in metres.

 

300

375

450

525

600

675

750

900

1050

1200

1350

1500

1650

1800

On/Off

6/6

6/6

6/6

6/6

6/6

6/6

6/6

6/6

6/6

6/6

6/6

6/5

6/5

6/4