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Pneumatic and hydraulic valves
Aug 10, 2016

Pneumatic valves and hydraulic take the pressure of the air, water or oil as the energy source, using the cylinder (or cylinders) and the movement of the piston to drive the valves, pneumatic air pressure is less than 0.8MPa, hydraulic pressure or oil pressure 2.5MPa~25MPa. Used to drive the diaphragm valve Rotary air and hydraulic drive device for driving the ball valves, butterfly valves and plug valves. Driving force of the hydraulic actuator, suitable for driving large diameter valves. Used to drive when plug valves, ball valves and butterfly valves, you must convert the reciprocating motion of the piston surface rotation. In addition to the cylinder or the hydraulic cylinder piston to drive the outer, and driven by pneumatic diaphragm, due to its itinerary and drive smaller, it is mainly used for control valves.

Manual valves

Manual valve is the most basic way to drive the valve. It includes using the handwheel, handle or direct drive and driven through the transmission mechanism in two ways. When the valve is open when the torque can be driven through a gear or worm gear transmission, in order to achieve the purpose of omitting. Gears spur gears and bevel gear transmission. Gear reduction ratio is small, suitable for gate and globe valves, larger worm gear speed reducer, applies to cock Flash, ball valves and butterfly valves.