Pressure Relief Valves

Pressure relief valves – protection against overpressure in the hydraulic system

Pressure relief valves reliably protect the hydraulic system of a tail lift against impermissibly high pressure. They open a defined cross-section as soon as the set threshold is exceeded and route the fluid pressureless back into the tank. At SULEJ Ladebordwand you will find pressure relief valves in adjustable and fixed-set designs, matched to the installed component and available in various sizes and connection variants – a safety element within the hydraulic circuit.

Direct-acting or pilot-operated – designs and application areas

Direct-acting versions work with a spring and a poppet seat and react quickly to short pressure peaks. Pilot-operated designs use a small pilot circuit, regulate the main pressure significantly more precisely and are suitable for larger flow rates. Adjustable variants are sealed with a locking screw, while fixed-set variants come from the factory with a defined cracking pressure. Housing and seat are typically made of steel with a hardened poppet – designed for high load-cycle counts without visible wear.

Setting and function test – what to include

When replacing, the setting of the cracking pressure is the decisive point. The target value results from the specifications of the installed component and is checked with a pressure gauge on the test port. Pay attention to clean sealing surfaces, undamaged poppets and a complete stroke – a sticking poppet leads to fluctuating pressure and uneven platform movement. After every adjustment the locking screw should be sealed again and operation checked with a complete lifting cycle.

Benefits at a glance

• Reliable protection against overpressure throughout the hydraulic circuit
• Adjustable and fixed-set designs for different requirements
• Steel housing with hardened poppet for high load-cycle counts
• Compatible with common valve blocks and connection patterns

A precisely set pressure relief valve secures the function of all other components and protects against uncontrolled pressure peaks.