Pressure Relief Valves
A pressure relief valve is a key safety component in hydraulic systems and reliably protects the system from impermissibly high pressures. As soon as the set maximum value is reached, the valve opens and discharges excess oil in a controlled manner, effectively protecting components, lines and consumers from damage. Pressure relief valves are indispensable in almost all hydraulic systems, especially in mobile machines, industrial units and control circuits. In the LöSi® web shop, you will find high-quality pressure relief valves in various pressure ratings, designs and connection types – suitable for every application.
What is a Pressure Relief Valve?
A pressure relief valve (PRV or relief valve for short) is the life insurance of your hydraulic system. Its task is simple but critical: It limits the maximum system pressure to a preset value.
If the pressure rises – for example due to blocking of a cylinder or overload – above this limit value, the valve opens. The excess oil is diverted directly into the tank. Thus, the valve prevents catastrophic damage such as bursting hoses or pump cracks. It is legally and technically mandatory in every hydraulic circuit.
Advantages of Our Pressure Relief Valves
Safety tolerates no compromises. Our valves react lightning-fast and precisely to cut off pressure peaks before they cause damage.
Technical differences for your application:
- Direct Acting: Extremely fast reaction time. Ideal for intercepting short, hard pressure peaks (shock valve). Robust and insensitive to dirt.
- Pilot Operated: For large flow rates. Keeps the pressure very constant even when fully open (flat characteristic curve) and operates quieter and smoother.
- Adjustability: Many models can be adjusted exactly to the desired maximum pressure during operation via a handwheel or tool.
Typical Areas of Application
From the tiny control block to the huge press – the PRV can be found everywhere, usually in two positions:
- Primary Protection: Directly behind the hydraulic pump to secure the entire system (Main PRV).
- Secondary Protection (Shock Valve): Directly at the cylinder or hydraulic motor to intercept pressure peaks caused by external forces (e.g., excavator bucket hits rock).
- Vehicle Construction: In tippers and tail lifts as overload protection.
Selection Criteria & Technical Data
A valve that is too small cannot drain the oil fast enough (pressure continues to rise), one that is too large is unnecessarily expensive and sluggish.
Observe these parameters:
- Flow Rate (l/min): The valve must be able to divert the entire delivery rate of the pump to the tank without the pressure rising impermissibly.
- Setting Range: Select the spring range so that your desired pressure (e.g., 200 bar) is easily adjustable (e.g., spring range 100-350 bar).
- Design: Do you need a cartridge for control blocks or a housing valve for line installation?
- Response Behavior: Damped for stable systems or undamped for fast reaction?
Select & Order Pressure Relief Valve Now
Protect man and machine from excess pressure. Discover our range of tested PRVs for every pressure range.
Benefit from technical advice on correct dimensioning. Select flow and setting range now and order safety directly online!
