Hydraulic Directional Control Valve Symbols Pdf

The spool mounted in the directional valves common known as sliding type often consists of lands as well as grooves.

Hydraulic directional control valve symbols pdf.

As with all fluid power components directional control valves can be represented by standard symbols published in iso 1219. Each position the valve can take is represented by a square. The direction of hydraulic fluid flow is controlled by a directional control valve. Hydraulic directional control valve.

A 3 way valve not only supplies fluid to an actuator but allows fluid to return from it as well. They do not give any further information about the design flow orifice size etc. Basic check valves allow fluid to flow in one direction but prevent fluid from flowing in the opposite direction. Basics of the iso symbols.

Composite symbols can be devised for any fluid power component by combining basic symbols. A directional control valve broadly consists of four parts. The valve spool get shifted with respect to the valve body which opens or closes valve ports. 1 2 1 6 this standard provides basic symbols which differentiate between hydraulic and pneumatic fluid power media.

The iso symbols display only the function of the valves. Schemes of directional valves the description of directional valves is standardized by din iso 121. The grooves also allow gas or oil to flow around the given spool at the same time through valve body. Figures 8 5 through 8 10 show schematic symbols for 3 way directional control valves.

Hydraulic schematic symbols directional control valve 4 ports 2 positions directional control valve with 4 ports and 2 finite postions directional control valve 4 ports 3 positions directional control valve with 4 ports and 3 finite postions center position can have various flow paths directional control valve 5 ports. Namely these are the valve body valve spool actuator and spring. These directional valves consist of a housing 1 control spool 2 control mechanism 3 and return spring 4. Hydraulic directional valve symbols introduction.

Perhaps the simplest of all directional control valves is the check valve a specific type of binary valve. Simplified symbols are shown for commonly used components. Inlet outlet and exhaust or tank. 3 way directional control valves a 3 way valve has three working ports.