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Pressure Relief & Venting Functions

Pressure Relief & Venting Functions

Cartridge relief valve covers feature manual pressure setting adjustment with a choice of adjusters, i.e. micrometer (M), micrometer with key lock (K), or standard square end screw with hex. locknut (W). Additionally, venting, unloading, and remote piloting are possible. Alternative arrangements include integral electrical selection of pressure or venting and of dual pressure settings and venting. Electrically proportional control is also available.

The cartridge insert consists of a sleeve, a seating poppet (area ratio 1:1), and a closing spring. It is retained in the manifold cavity by a control cover which contains the manually adjustable pilot valve and all piloting connections. An ISO 4401, size 03 (ANSI/B93.7M-D03) mounting interface for pilot control valves or modules is optional. Cartridge valve characteristics can be matched to application requirements by adding suitable orifices in the pilot circuit. Relief valve arrangements described in this catalog can be built into system manifold assemblies with directional flow regulating and pressure reducing functions in cartridge form.

System Relief Valve

ISO 7368, B*-**-2-B specifies an interface strictly for use with main system relief valves. This interface differs from ISO 7368, B*-**-2-A, only in the position of the orientation pin which prevents any other valve function from being inadvertently installed where a system relief valve should be used. Eaton-Vickers introduces system relief valve covers, type CVCS-**-SC(*) in compliance with ISO 7368, B*-**-2-B. This is in addition to existing relief covers type CVCS-**-C(*) which conform to ISO 7368, B*-**-2-A.

Maximum Operating Pressure

Up to 350 bar (5000 psi), dependent on the maximum pressure of any pilot valve or module used

Pressure Adjustment Range

3 to 125 bar (43 to 1800 psi)

5 to 250 bar (72 to 3600 psi)

8 to 350 bar (116 to 5000 psi)

Maximum Recommended Flow Rates

Nominal sizes ISO 7368 (DIN 24342):

06 (NG16 ............................................... 255 L/min (67 Usgpm)

08 (NG25 ............................................. 590 L/min (155 Usgpm)

09 (NG32 ........................................... 1250 L/min (330 Usgpm)

10 (NG40 ........................................... 1700 L/min (450 Usgpm)

Control Data

Manual pressure adjustment is located in the control cover. A vent connection is provided for optional remote control by suitable pilot pressure or pilot directional control valve(s).