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Hydraulic Valves
Hydraulic valves are widely used in various industrial applications. The main purpose of hydraulic valve is to control the flow of liquid. Hydraulic valves control and direct the oil from the time it leaves , the pump until it starts on its return to the reservoir in a hydraulic circuit. The relief valve is almost always the first one encountered by the oil after it leaves the pump. From that point on throughout the circuit, the type of valve employed depends upon the design of the circuit.Types of Industrial Hydraulic Valves
In a very simple circuit the second and only other valve used will probably be the master control valve. In a complex circuit the hydraulic oil may flow through a sequence valve, master control valve, reducing valve, flow control valve, check valve and several others before it finally returns to the reservoir. The check valves let hydraulic fluid flow in only one direction. There are directional control valves in which the fluid move in the direction where it is needed. So depending on the purpose served, hydraulic valves can be divided into the following types:» Hydraulic Control Valve
» Hydraulic Solenoid Valve
» Hydraulic Flow Control Valve
» Hydraulic Check Valve
» Hydraulic Relief Valve
» Hydraulic Pressure Control Valve
Uses of Hydraulic Valves
Hydraulic valves as used in industrial applications are built in several pressure ranges. The majority of present applications are in the range of 0 to 1500 lb per sq in., but the trend is toward higher pressures. Various types of valves are used in hydraulic systems to control or regulate the flow medium. Basically valves are expected to control:(a) Blocking or stopping of flow
(b) Direction of flow
(c) Pressure of flow media
(d) Flow quantity
