Dynamic Functions

Dynamic cartridge valves have been developed for applications which require fast opening and closing times as well as a means of ensuring that the insert/poppet has seated positively.

Inserts are available:

• With seals on the poppet which eliminate internal leakage, ensuring pressure is maintained in pilot port A.
• Without spool seals for fast response with low hysteresis.

Dynamic valves can be built into any system manifold assemblies which require the features offered by this new range, whether for directional or check control function. The inserts are offered with the three springs L, M and H, and the cover comes with or without a stroke limiter. Dynamic range is available in sizes 16 to 63. The inserts have an area ratio of 1:1.05 as seen by the model code CVI-xx-ZD105, where Z means dynamic.

Basic Characteristics

Maximum operating pressure: 350 bar (5000 psi)

Maximum flow rate (Δp = 5 bar/72 psi):

All ports are rated up to 350 bar (5000 psi) depending on limits for relevant ports in any associated pilot valves or modules.

Features and Benefits

• Opening and closing independent of A and B port pressure.
• Positive closing using pilot pressure.
• High degree of control and repeatability.
• Smooth and accurate operation can be achieved (not affected by main flow).
• Fully interchangeable with conventional cartridges.
• Varied circuit application uses: pilot operated check, prefill valve, decompression valve, flow control valve, etc.
• Zero internal pilot leakage option: ZD105.
• Low hysteresis, fast response option: ZDN105.

Check Valve Functions

Unlike other cartridge valve inserts, the dynamic insert extends above the manifold to allow access to the pilot port. It is this pilot port which pilots the poppet open or closed giving the dynamic feature. The pilot pressure is applied via the Z2 port on the manifold if there is no pilot valve or via the B port on the size 03 interface.

Piloting can be achieved by directly mounting a size 03 directional valve on the mounting pad with an ISO 4401, size 03 (ANSI/B93.7M-D03) interface which accepts any of the DG4V-3 valves. The Z2 port is used for remote control of the dynamic insert.

The dynamic insert can only be used with the special dynamic cover. The cover can also be offered with a stroke limiter for those applications where it is required to limit the stroke and hence the flow of the relevant insert. Dynamic function is suited for directional or check control functions requiring fast response.