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A solenoid valve is activated by electricity and becomes a hydraulic solenoid valve when fluid is introduced. They are used in various applications and can be powered by AC or DC. Different types are not interchangeable. Replacement varies based on the application.
A solenoid valve is a voltage actuated valve, which means that it is activated by an electrical charge. Hydraulic machines use oil under pressure as their primary source of energy, so a solenoid valve becomes a hydraulic solenoid valve as fluid is introduced into its ports or openings. The fluid is used to perform a variety of tasks, such as moving a cylinder or backhoe or tilting and tilting a snow blower. The job of the valve is to direct the flow of fluid or to stop or start the flow of fluid.
The electricity used to power the valve can be alternating current (AC) or direct current (DC). AC is usually used in industrial applications, while DC is used in mobile applications, such as in a forklift or backhoe.
The main types of hydraulic solenoid valves are Japanese, American and German, and geographical differences are built into each of them. These types are not interchangeable, nor are they compatible. Two port hydraulic solenoid valves are the most common, and there are also types of solenoid valves designed with three or more ports. A two port hydraulic solenoid valve does not necessarily allow hydraulic fluid to flow bi-directionally or in two directions such as in and out, although it is possible that the design of a solenoid allows for bi-directional flow.
Hydraulic solenoid valves are used in a wide variety of applications including wood chippers, stump grinders, buckets and auto crushers. They are also used in automotive drivetrains, snow blowers, backhoes, road rollers, pavers, excavators and cranes, to name just a few applications. In general, anything that moves under hydraulic force has a hydraulic solenoid and a hydraulic solenoid valve to activate the movement. The special hydraulic solenoid valves used in chemical plants are designed to be explosion proof because a spark in a chemical plant can be extremely dangerous.
The job of replacing a hydraulic solenoid valve varies based on the application of the solenoid. The job may involve replacing only the coil if that is the only part to be replaced, without replacing the entire solenoid valve. This leads to ease of repair and maintenance. If it is necessary to replace the entire valve, it must first be removed from the pipes and threaded connections.
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