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What does control valve do?
Control valves are installed in pipelines. These directional control valves determine the flow of water. They are an important part of the hydraulic machinery. The spool inside the control valve decides the flow of the liquid. The direction control valve not only determines the flow of liquid and gasses but has the capacity to control gasses and the flow of the air. They can stop the airflow, start the air flow and also change the direction of the air flow just like they do in liquids. Many industries use gases to operate their machinery. These directional control valves play an important part in the movement of air flow.
Number of valves
The numbers of valves vary according to the use. They are available in the range of two-way valves to four-way valves.
The two-way valves operation is quite simple. It only functions as switching on and switching off. These valves are used for supplying pressure to systems, working on motors and in branch airlines.
Three-way valves work in similarity to the two-way valves. Its third port allows flowing/stopping of the flow, as well as aids in exhaustion. Similarly, the four-way valve is again similar to the three-way valve control but has an additional outlet to work as an alternate. They are used for dual acting cylinders. Even two single acting cylinders can be operated using four-way valves.
The methods of operation of directional control valves-
- Manually operated valves- there are valves which work on levers and paddles. Spring forces are used to get the valve return to its position.
- There are mechanically operated valves which work on rollers, wheels, and cams. Since these are mechanical in their working they are subjected to wear and tear.
- Hydraulically operated – the pressure is much higher in comparison to the other varieties of valves.
- Selenoid operation- these valves work on electro-mechanical solenoids for moving the spools or valves. They are used in hydraulics industry.
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