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The pressure relief function is obtained by using a model D10 or C10F (1:1 area ratio) insert poppet and either a model C or C3 cover. Zero leak function to have no leakages from pilot to B line is also available using D10Z & C10FZ (ratio 1:1) spool. The C3 cover includes a mounting pad for a pilot valve with an ISO 4401, size 03 (ANSI/B93.7M-D03) interface. Single or double solenoid pilot valves are applicable. A model CVGC-3 module is available for use with dual solenoid pilot valves to obtain two pressure settings and a vent (both solenoids deenergized) condition.
For main system relief functions use model type SC, SC3. Electrically controlled proportional pilots provide infinitely variable pressure settings over a wide pressure range, achieved by using either a D3 cover or a remote pilot. In each configuration the Z1 port is used as a vent port or for remote hydraulic control. A suitable remote control is the CGR-02 valve. Port Z1 should be blocked when not required. Port Y is a drain port.
When the insert’s B port goes directly to tank the Y port can be connected to it. However, any back pressure in the B port is additive to the pressure setting. If there are pressure surges in the B port, the Y port should be directly drained to the tank through a separate line. All functions are available in sizes 16, 25, 32 and 40.
Sizes 16 to 40
Two insert types are available for pressure relief functions: Type D10 has no internal orifice and requires pilot connection A to X to be made in the manifold block.
Type D10 insert has good response combined with low shock characteristics and is recommended for general use.
Type C10F has a fixed orifice connecting port A to the pilot relief stage, allowing through-spool piloting for faster response. The higher response characteristics of type C10F can be further enhanced by the addition of the connection A to X within the manifold block. System shock generation is dependent on the usual factors of trapped volume, system pressure and flow rate.
For stable valve operation follow Eaton-Vickers recommendations for selection of spring for each size of insert. Factory-fitted orifices in the covers are sized such that a given relief cover can be used with either insert type. Further fine tuning to suit particular system requirements can be achieved by changing orifice sizes. Operation of both types D10 and C10F is similar: System pressure at A(P), is determined by manual pilot adjustment. Orifices in AP and X ports dampen poppet reaction time, preventing instability. Connecting port Z1 to tank (via an appropriate remote control valve) vents the system pressure at port A(P) to a level equivalent to insert poppet spring load plus override pressure.
Sizes 16 to 40
When the solenoid is de-energized, the cartridge is vented. When the solenoid is energized, pressure at port A(P) is limited by the setting of the adjuster in the cover. A left hand pilot valve arrangement is shown. A right hand model would allow venting when the solenoid is energized.
Sizes 16 to 40
The CVGC-3 module, controls low pressure which occurs when solenoid “a” is energized. Solenoid “b” is energized to obtain the high pressure set by the adjuster on the C3 cover. When both solenoids are de-energized, system pressure is vented to the reservoir. For selection of pilot control module CVGC-3.
Sizes 16 to 40
Maximum pressure is set by the adjuster on the C3 cover. Pressures below this pressure are remotely electrically adjusted by the proportional pilot valve. Increasing current to the pilot increases the pressure setting.
