Blakeborough Controls Valves - Weir Power & Industrial - #39

Text version of the page

Weir Power & Industrial First choice for power and industrial protection 39 Blakeborough DIAPHRAGM, MANUAL & LEVER ACTUATORS BC 5-0309 200 in2 Direct Acting Diaphragm Actuator 200 in2 Reverse Acting Diaphragm Actuator A40 & A41 series piston actuator - general description The Blakeborough, spring return diaphragm actuators come in two basic forms, the type A40 which is direct acting and the A41 which is reverse acting. Both are designed with a cast iron yoke (carbon steel on request) and a high integrity carbon steel diaphragm case. The A40 actuator is designed with an air tight upper chamber and when air is applied the pressure pushes the actuator stem downwards. When air is released the spring force lifts the actuator stem upwards. The A41 actuator has a pressure tight lower chamber and when air is applied pressure lifts the actuator stem. When air is released the actuator spring pushes the stem downwards. Features Manual Controls • Side Mounted Handwheel (geared) • Side Mounted Handwheel (clipon) • Top mounted handwheel • Top mounted limit stop Travels • 19mm (34") to 178mm (7") Mounting • The actuator yoke allows easy access to the gland and stem coupling. The base is secured to the bonnet by a clamp ring (on larger yoke mountings bolts are used) and the complete unit may be removed without disturbing the gland of the valve. Stem Coupling • Actuator and valve stems are connected by a steel split coupling, the halves bolted together to ensure a tight union. Position Indicator • A travel indicator having pointer and graduated plate shows the position of the valve plugs at all times. Materials of Construction • Yoke - Nodular cast iron (carbon steel on request) • Case - High integrity carbon steel • Spring - High tensile spring steel • Diaphragm - Buna ‘N’ nitrile rubber (other materials on request)