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Double pilot operated check valves
Discover our double pilot-operated check valves for maximum safety and precision in your hydraulic systems. These special valves reliably secure the holding
position of double-acting hydraulic cylinders and prevent unintended load lowering, even in the event of a pressure drop. Learn more...
position of double-acting hydraulic cylinders and prevent unintended load lowering, even in the event of a pressure drop. Learn more...
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Our double pilot-operated check valves are designed for operating pressures up to 350 bar and are available in various configurations, e.g. with G 1/2'' ports for up to 70 l/min and G 3/8'' ports for up to 30 l/min. The robust design using high-grade steel or aluminium ensures a long service life even under high loads. Ideally suited for agricultural machinery (e.g. top links), construction machinery and industrial applications, Hydromot check valves increase the operational safety and performance of your hydraulic system.
Double Pilot-Operated Check Valves (DRV) – Frequently Asked Questions
What is the primary function of a double pilot-operated check valve?
Double pilot-operated check valves (DRV) are used to adapt the flow rate to the required specifications or to protect individual components or the entire hydraulic system. They ensure a secure holding position of the cylinder – even when no pressure is applied.
How is the operating principle of these valves described?
These valves consist of two integrated check valves that mutually release each other. This enables controlled flow in both directions, while unwanted reverse flow is reliably blocked. The release is achieved via external pilot pressures.
In which systems are double pilot-operated check valves primarily used?
They are mainly used in hydraulic systems with double-acting cylinders. Typical applications are found in agricultural machinery (e.g. top links), construction machinery and industrial plants where cylinder forces must be safely maintained.
What are the key advantages of double pilot-operated check valves?
These valves offer several key advantages:
- Secure holding function: No lowering or loss of cylinder position in the event of a pressure drop
- Leak-free shut-off: Reliable sealing due to the double valve function
- Precise control: Controlled and safe hydraulic flow
Which materials are typically used to manufacture these valves and what pressures can they withstand?
DRV are generally manufactured from robust materials such as steel or aluminium. For special applications, versions made of stainless steel are available. The valve bodies are designed for high operating pressures and typically withstand 250 to 350 bar.
What technical specifications do typical check valves feature?
Typical technical characteristics include:
- Ports: G 1/2'' or G 3/8''
- Maximum operating pressure: up to 350 bar
- Maximum flow rate: e.g. 30 l/min or 70 l/min
- Cracking pressures: typical values are 3.5 bar or 4.5 bar
What are decisive parameters for selecting the correct double pilot-operated check valve?
The most important selection criteria are:
- System operating pressure and flow rate
- Port sizes and installation dimensions matching the hydraulic piping
- Material compatibility with the hydraulic fluid used
- Pilot ratio (pilot pressure to cylinder pressure)
- Operating conditions such as temperature and environmental influences
How are maintenance and service life of these components described?
Due to the robust design, maintenance requirements are low. Regular tasks include:
- Checking for leakage and proper function
- Cleaning the valve seats
- Replacing wear parts as required
When used correctly, the valves achieve a service life of several years.