Construction of spring return pneumatic actuator1,Website: , 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'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'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 ball material : A105, LF2,304,316,316Lstem material : 420, LF2,F304,F316Seat material : PTEF,PEEK,PPL2, BALL VALVE STRUCTUREFloating ball and trunnion mounted ball with 2-piece or 3-piece body3, CONNECTION ENDDouble flanged end, screwed end, wafer end, butt welded end4, VALVE STANDARDDesign : API 608, API6D,ASME B16.34, DIN3357/1 Length of face to face : ASME B 16.10, DIN 3202 F1 or F7Flange end : ASME B16.5, EN1092-1Thread end: ASME B16.11Test : API 598, BS EN 12266, ISO 52085, VALVE SIZE and PRESSURE RANGENPS : 1/2'' - 8''for floating ball valve and wafer ball valve1/2''-4''for thread end ball valve2''-20''for trunnion mounted ball valvePressure : 150 LB - 1500 LB, PN10-PN646, ISO5211 DIRECT MOINTING PADFor ball valve connection size information, pls check our ball valve page of this website !