Marsh Automation Pvt. Ltd. Offers Spur Gear Type Reduction Units. Marsh Automation Pvt. Ltd. Is an ISO 9000 accredited company. The company manufactures Electrical Activators Motorized Valves, Pneumatic Valves, Electrical or Pneumatic Actuators. The Spur Gear Type Reduction Units designed either for hand-operation or electric multi turn actuators. The unit is suitable to operate valves with rising or non rising stems, such as gate, sluice and other rotary valves.