State different types of pressure control valves with their applications.

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S. N.	Pressure control valves	Applications
1	Pressure relief valves	Relief valve opens and bypasses fluid when pressure exceeds its setting.These areused mostly in all circuits.
2	Pressure-Reducing Valve	This type of valve (which is normally open) is used to maintain reduced pressures in specified locations of hydraulic systems
3	Unloading Valves	high-low pump circuits where two pumps move an actuator at ahigh speed and low pressure, punching press,
4	Counter balance valves	They are used to prevent a load from accelerating uncontrollably. This situation can occur in vertical cylinders in which the load is a weight. This can damage the load or even the cylinder itself when the load is stopped quickly at the end of the travel

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