Hydraulic valves are important part of any hydraulic system.
They are the elements through which the operation controls the hydraulic system. Given here a brief description of how hydraulic valves work
Human Element Works Through hydraulic valves
Nowadays, the controlling is done through computers and digital controls. All the signals are transferred through wires and the work is done through the interface on display monitors.
Gone are the days when the switches were part of the control panels and these days there is no tubing carrying fluid under pressure in any control panel
Now if you need to control any activity from a control panel, you need to have something that will convert the electrical signal into hydraulic signal. This is the work of hydraulic valves.
Internal Working of Hydraulic Valves
The valves control flow of hydraulic oil from one place to another. The hydraulic valves contain filters, coils, valve spools. The ports of valves are opened or closed according to the need and flow of oil is changed to have the desired effect. The following is the description of valves devoid of the jargon
The parts of hydraulic valves are
· Coils: This the signal that converts the electrical signal from a control panel to the hydraulic valve. The coils may be designed to get a signal from control panel and convert it for operation of valve. The coils may operate on the valves directly or through force multipilers that can supply additional force for operation of valve against hydraulic force.
· The filters: Hydraulic valves have very fine clearances and cannot operate with oil that is dirty. Hence filters form an important part of any hydraulic valves. Filters ensure that valve operates only with clean fluids. One micron (One millionth of a meter) is the most used size in most filters
· Valve Spools: Hydraulic valve spools are generally made from stainless steel. They cover or uncover valve ports as per of the system requirement and as per signal received from the control panel.
· Valve position feed back signal: The valve position feedback signal is necessary to make sure that system is controlled. The valve position feed back is essential and is done through electrical signal.
The spools of valves operate on the force balance system so that the force required for operating the valve is minimal. The transfer of power from one place to another is thus done with a small coil operating a spool and opening or closing the main valves that controls the process or performs the desired work.
The above description does not include other valves that are normally closed or open. These valves are also part of the hydraulic system but do not take part in control of the system. These valves may be valves include angle, ball, check, control, block and bleed, pressure relief, safety, shut off valves, drain, needle valves.
These valves although part of the hydraulic system and can control the system to a certain extent. These valves are present in any fluid system and have limited purpose of system control in an offline way.
The solenoid operated valves thus control the blood flow in the system and keep the system live.