... -casting Aluminum alloy Shell:fire-proof PC ABS plastic.VA-VB 3000 Series Actuator has reversible increasing and proportional two control modeCharacteristics ... indicator.-010V DC or 420mA DC control (For VA-7101(VA-7201)and VA-7102(VA-7202)only)-Apply to 24mm,36mm,40mm,or ... DC feedback signalFunction Can be mounted on VB-VB 3000 Series Brass Valve, if be with different connectors,it can be ...