SOBD5A-R4

Overcentre Valve Fully Balanced SOBD5A-R4/l HA 5208 7/2008 M27 x 1,5 pmax 350 bar Qmax 90 L/min q The valve prevents runaway in the event of a nega- tive load Replaces HA 5208 9/2006 q Load-holding with minimal leakage q Pressure relief function protecting the actuator against overload and pressure peaks q When installed into the actuator the valve can be used as a hose burst valve q When used as pressure relief the check valve will act as an anti-cavitation valve q Relief setting is unaffected by back pressure q The valve should be mounted as close as possible to the actuator Functional Description The valve consists of a seat by-pass, relief valve fitted with an auxiliary control with a differential piston and by-pass single-way valve serving for reverse direction of flow. The liquid is flowing through the single-way valve from the channel (2) to the channel (1) with a small pressure drop. In the opposite direction the single-way valve on the rear side of which a gate valve seat is fitted is pressed through the action of a spring and the load pressure against the spring-loaded valve gate valve. In this way the valve is nearly closed hermetically. If the pressure in the channel (1) exceeds a set up value of the spring force the gate valve is pressed out of the seat and the overpressure in that case is relieved into channel (2). For ensuring the function of holding the load the spring force should be set up to a value by 30 % higher when compared to an expected ...