Check Valves
Browse hydraulic check valves for mobile, industrial and construction machinery. Check valves allow hydraulic oil to flow in the intended direction while preventing unwanted reverse flow.
Find the correct valve by OEM reference, cracking pressure, maximum pressure, flow capacity, thread type and port size.
Hydraulic Check Valves for Flow Control and Circuit Protection
Hydraulic check valves, also known as non-return valves, are designed to allow hydraulic oil to flow in one direction while restricting flow in the opposite direction.
They are used in mobile machinery, industrial hydraulic systems, agricultural equipment and construction machines to protect circuits, maintain pressure and control load movement.
How Does a Hydraulic Check Valve Work?
When inlet pressure exceeds the opening or cracking pressure, the internal poppet or ball moves and allows oil to pass. Reverse pressure pushes the internal element against its seat and blocks flow in the opposite direction.
Applications of Hydraulic Check Valves
- preventing reverse oil flow,
- maintaining pressure in a circuit,
- protecting pumps and other components,
- isolating sections of a hydraulic system,
- supporting load-holding circuits,
- controlling oil movement between hydraulic branches.
How to Select the Correct Check Valve
Important parameters include:
- maximum operating pressure,
- flow capacity,
- cracking pressure,
- port size,
- thread type,
- installation direction,
- OEM or manufacturer reference.
Cracking Pressure
Cracking pressure is the minimum pressure difference required to begin opening the valve. This parameter can be important for the behaviour and response of the hydraulic circuit.
Flow Direction
A check valve must be installed in the correct direction. Always follow the flow arrow or hydraulic symbol shown on the valve body or technical documentation.
Common Check Valve Problems
- reverse flow when the valve should be closed,
- restricted forward flow,
- excessive pressure drop,
- unstable load holding,
- internal leakage,
- contamination preventing the valve from seating correctly.
Replacement Hydraulic Check Valves
When selecting a replacement, match the hydraulic function, pressure rating, flow capacity, cracking pressure and connections of the original component.
FAQ – Hydraulic Check Valves
What does a hydraulic check valve do?
It allows hydraulic fluid to flow in one direction while preventing or restricting reverse flow.
What is cracking pressure?
It is the minimum pressure difference required for the check valve to begin opening.
Can a check valve cause slow hydraulics?
Yes. A restricted, incorrectly sized or contaminated check valve can create excessive pressure drop and reduce hydraulic performance.