t? 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 metls. 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 cou