Hydraulic valves are essential as they help control the flow of any liquid specifically, oil, in the system. Choosing the most suitable valve(s) is crucial to any hydraulic system. It comes in different sizes and types depending on the pressure of the system as well as the flow rate.
3 Main Classifications of Hydraulic Valves
There are 3 main classifications of hydraulic – directional, pressure and flow control. Directional are used to control the fluid’s direction from the start to the end. Pressure valves however are used when a specific pressure level is required. The flow controls are used to control the flow rate of the fluid in the system.
Other Types
Aside from the main classifications, there are special hydraulic valves that are used dependent on the requirement. Some examples would be multi-block directional, modular, cartridge, electro-hydraulic servo, electro-hydraulic proportional/digital, micro-hydraulic and water pressure control.
Multi-block directional ones are composed of a main valve with several valves including a directional, a pressure and a check valve that is used to centralize control of the machine. The safest and most environmental friendly valve on the other hand is the water pressure valve which is used to control water in many water hydraulic systems.
4 Ways of Valve Installation Connection
Hydraulic valves are essential to a complete system. That being said, there are four different ways that valves are installed and connected – threaded, modular, sandwich plate and cartridge.
- Threaded:
These valves are usually used for small flow systems as they are lightweight. This valve is very popular and can be mounted along pipelines.
- Modular:
Modular valves are often used with modeling and pressing machines as well as with hydraulic power units. The valve makes use of valve sub-plate to connect with pipelines.
- Sandwich:
These valves are flexible as one can use it as a single unit or as part of the hydraulic oil connection. Often, the valve is sandwiched between a direction control and a sub-plate to connect with the pipe system.
- Cartridge:
Cartridges are divided into two different styles – cover plate or a two-way cartridge valve/threaded which can be two or more cartridges. The valves are made with sleeves, seat, spring, spools and sealing rings. Once all the parts are assembled, the valve is then inserted into a valve cavity. The cavity helps protect the parts inside making it suitable for heavy machine use.
These are just a brief overview of the different types of valves and hopefully provide readers an idea helping them make smart decisions later on.
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