Check Valves

Direct and pilot operated check valve functions for applications up to 350 bar (5000 psi) and 227 L/min (60 USgpm)

Danfoss Integrated Hydraulics range of direct and pilot operated check valves provides the hydraulic circuit designer with a wide selection of cartridge and in-line products.

All poppet type check valve cartridges have hardened and ground poppets and sharp-edged ground steel seats. This provides an excellent product that is dirt-tolerant, has reliable seating, and is suitable for fast cycling with long life.

Direct operated check valves

Cartridges fit into industry standard cavities and may be supplied for installation in manifolds, or be provided in standard housings having SAE or BSPP ports suitable for in-line mounting.

A wide selection of cracking pressures is available from 0,21 to 20,7 bar (3 to 300 psi). Thus the opportunity exists to use the valves not only as conventional check but also as low pressure relief valves.

Pilot operated check valves

These valves are used for:

• Position load locking
• As an alternative to counterbalance valves where neither the overrunning loads or release speed are factors in the application.

The high pressure 4CK series pilot-to-open check valves complement the 1CE series counterbalance cartridges and are physically interchangeable with them.

The 4CK provide a low cost Alternative to load control when the dynamics of neither overrunning loads nor load release speed are factors to be considered in the design of the hydraulic circuit for the load to be controlled.

The pilot-to-open valves positively lock a load from port 1 to port 2 until pilot pressure applied to port 3 is sufficient to unseat the valve. This then permits flow from port 1 to port 2.

The 4CK covers flow up to 300 L/min (80USgpm). These POC valves are suitable for use in a broad range of load control applications with typical system operating pressures up to 350 bar (5000 psi).

Features and benefits

Valves are offered with a wide variety of standard housings with SAE and BSPP port options in the following configurations:

• In-line single
• In-line dual
• SAE, 4-bolt, code 61
• Close coupled, nipple mounted
• Gasket mounted single
• Gasket mounted dual