The Different Types of Hydraulic Control Valves
Hydraulic Control System are those which are controlled by hydraulic pressure. These devices control the fluid flow in a process system. They control the fluid from the time it leaves the pump. The type of valve used in a circuit depends upon its design. In a simple circuit, the only other nozzle used other than a control nozzle is the master control valve. But in the case of a complex circuit, the fluid would have to flow through the sequence nozzle, reducing nozzle, master valve, check nozzle, flow control nozzle and many other types of valves before the fluid finally returns to the reservoir.
The Hydraulic Control System are mostly used for industrial applications. These valves are built in several pressure ranges and the majority of the applications range from 0 to 1500 lb per sq in.
The different types of Hydraulic control valves are
1. Closed control – When a nozzle is in neutral position, it would automatically stop the pump flow to the tank.
2. Parallel – In this valve the oil flow is divided equally on the consideration that the operating pressure requirements are the same for all functions.
3. Open center – This valve connects the pump flow to the tank, when the valve spool is in neutral position
4. Four way – These valves are most commonly known as the double acting valve. They have four functional port connections. The ports consist of two work ports a “pump” port and a “tank” port.
5. Free flow – The design of this valve is in such a way such so as to facilitate the flow from “work” ports to “tank” while in neutral position.
6. Three way – They are mostly called as single-acting valve. They have three functional port connections.