Solenoid
directional control valve can be used with one or more sources to
direct the flow of various fluids into different directions. It differs from manually and hydraulically
pilot-operated valves as it is electrically controlled as opposed to using multifarious
mechanical linkages or hulking hydraulic pilot lines for actuation of the
valve. It is much easier to install solenoid valves and it saves on cost as
well.
Solenoid directional valves are commonly used in circuits
where 2-way, 3-way, and 4-way functions are required. You can choose from direct acting and pilot
operated valves that are available in poppet and spool configurations in the
market.
Like pilot-operated valves, the
direct acting valves do not require minimum pilot pressure for valve actuation.
Pilot operated valves may offer the benefit of higher capacities. While the solenoid actuators operate in a highly efficient, push fashion.
You can work creatively with the manufacturers to create you
own style valve. A hybrid valve that incorporates a poppet style valve with an
integral check valve can give you many benefits. The check valve
allows free flow from port 2 to port 1 while the poppet can control
flow between port 1 and port 3. To control motion and to provide load holding, this type of valve can be used in a circuit with a single acting
cylinder.
As with most hydraulic machines, pistons are powered by a
basic hydraulic pump. The pump is responsible for keeping a steady stream of
pressurized fluid flowing into the system. There is no risk of leaks as the
valves are designed to be leak proof. In any set up the valves are connected to
several hoses that may lead to the hydraulic pump, a tank that feeds liquid
back to the pump, and cylinder pistons.
The piston rod that extends outside the cylinder is moved by
a piston head inside the cylinder. Two different hoses feed the fluid to both
sides of the piston. If the force is greater on one side, the piston moves to
the other side. For changing the direction of force, you need to stop pumping
oil to one side to start pumping it to the other side. This type of piston
cylinder is called a hydraulic ram. Directional control valves direct the flow of
liquids to these rams. The valve has a spool that moves back and forth, to block
some inlet and outlet ports to open others.
