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Construction of spring return pneumatic actuator1,Website:http://www.hugo-valve.com, the extruded aluminum alloy ASTM6005?body can be treated with hard anodized, powder?polyester? painted ( different colors is available such as blue, orange, yellow etc.),PTFE or Nickel plated according to different requirements.2, Position indicator with NAMUR is convenient for mounting accessories such as Limit Switch box, positioner and so on. 3, Die-casting aluminum powder polyester painted? in? different? colours,? PTFE? or Nickel plated.4, The tow independent external travel stop adjustment bolts can adjust±5°at both open and close directions easily and precisely.5, Made form low friction, long-life compound material, to avoid the direct contact between metals. The maintenance and replacement are easy and convenientSpring return pneumatic actuator& acute;s operating modeThere are two operating modes1, when ball valve closed, pistons outwards, causing the springs to compress, The pinion turns counterclockwise while air is being exhausted from port B. When ball valve opened, Loss of air pressure on port A, the stored energy in the springs forces the pistons inwards. The pinion turns clockwise while air is being exhausted from port A.2, when ball valve closed, Air to port B forces the pistons outwards, causing the springs to compress, The pinion turns counterclockwise while air is being exhausted from port B.? When ball valve opened, Loss of air pressure on port A, the stored energy in the springs forces the pistons inwards. The pinion turns clockwise while air is being exhausted from port A.Spring return pneumatic actuator& acute;s operating condition1, medium : Dry or lubricated air, or the non-corrosive gas2, air supply pressure: the minimum supply pressure is 2.5 Barthe maximum supply pressure is 8 Bar3, travel adjustment : have adjustment range of ±5° for the rotation at 0°and 90°Main technical data for ball valves1, BALL VALVE MATERIALbody material : WCB, LCB, A105, CF8,CF8M,F304,F316 bal