this series is a normal closed type. 

it's usually used to block the fluid line or guide the relief valve.

when the pilot pressure (port 1) arises to the setting pressure, the fluid flows from inlet port (port 2) to the tank (port 3). 

when the pressure drops (port 1), the spool returns.

rated flow :

20 l/min  

max. pressure :

350 bar

working temperature : 

min. -20鈩?, max. 90鈩?, with standard bunan gaskets

min. -20鈩?, max. 120鈩?, with optional viton gaskets on request

fluid :

best use mineral oil with viscosity ranging between 10 and 200 cst

filter :

25 micron or better

cavities :

see cavity data 08-03

installation :

before screwing the cartridge on the valve body, ascertain to provide suitable gasket lubrication with clean oil and also be sure to screw the cartridge manually in to reach against the gaskets in the valve body.