Directional hydraulic valve uses single or double solenoid mounting on the side of valve house, the each side of valve is called A or B side, it can be readable from Finotek valve nameplate. The solenoid consists of coil, steel core, piston and plastic plug, which is activated by electric signal. The voltage of solenoid can be 12VDC, 24VDC and 110VAC, 220VAC optional, for most of manually operation machines, the direct current solenoid operated directional hydraulic valve is often used, lots of the valve are quipped in plastic molding machines, pressing machines in industry. The house of Finotek directional hydraulic valve is black galvanization as surface treatment to prevent rust, the solenoids can be zinc plated in shining color and dull color for optional.