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hydraulic pressure controls

Why hydraulic pressure controls are essential

There are many components in a hydraulic system – some of which, such as the pipes or the hydraulic tank make up the system and are physical components that perform an obvious function. Hydraulic pressure controls usually remain behind the scenes, and yet perform some very important different functions that allow the system to work effectively and not encounter any problems with function. Different hydraulic pressure controls are essential for different reasons.

Most fluid systems are designed to operate within certain ranges of pressure. If this pressure gets too low, the fluid will not be pumped through the system effectively and it may cease to work or work slower than needed. If the pressure is too high, piping could burst or the system may become overloaded. Relief valves can control the pressure within the system, acting as safeguards which limit maximum pressure in a system, by diverting any excess fluid when pressure begins to rise. These hydraulic pressure controls are direct-acting valves. These valves consist of a ball, held exposed to pressure on one side and a spring on the other. This works to control pressure by allowing a set amount of fluid to flow past the reservoir to maintain the system pressure when it begins to rise. Most of these valves are adjustable, which is easily done. They relieve pressure in either direction, and so can control the pressure of the entire system at just one small point.

hydraulic pressure controls

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Other Types of valve

Another hydraulic pressure control is the pilot operated relief valve – these valves are used to relieve large flows with only small pressure ranges. They operate in two stages – the pilot stages act as a trigger to control the main relief valve. These valves do not begin to allow fluid to pass through until the system reaches 90% of it’s maximum pressure – this allows the efficiency of the system to be maintained, as very little fluid is released. They are best suited to systems with high pressures and volumes, and due to their slower operation they are able to maintain a constant pressure around the entire system, as opposed to a constantly fluctuating pressure due to the relieving and filling process.

Counterbalance valves are hydraulic pressure controls which are used to maintain pressure in a certain part of the circuit, to counterbalance a weight or an external force. This ensures that the extra weight doesn’t affect the set limits of pressure.

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