Connect the manual pump oil port to valve sleeve oil port The connecting diagram of manual pump oil port (seven holes) to valve sleeve oil hole (12 holes) is illustrated. When the steering wheel turns right side, the oil holes a, c, e, g, i and k are connected with pump through the valve cartridge slot. In the same way, the oil holes b, d, f, h, j and l are connected with steering cylinder. Under the situation shown in Figure 1, the manual pumps 1, 2 and 3 are under the status of oil output, at that time, such oil ports are just connect with valve sleeve oil ports l, b and d, respectively. The oil is transmitted to the oil cylinder through these oil ports.
In additionally, manual pump oil ports 5, 6 and 7 are under the status of oil intake, they are just connecting with valve sleeve oil ports g, i and k, respectively. The oil come from steering pump is intakes through these oil ports. When the steering wheel turns 90° as per the direction shown in Figure 1, the connecting diagram 2 illustrates the connection between the manual pump oil port and steering oil port, under such case, the manual pump oil ports 1, 2 and 3 are just connect to the valve sleeve oil ports i, k and a in which the oil is under the status of intake.
At the same time, the manual pump oil ports 5, 6 and 7 are just connecting to the valve sleeve oil ports d, f and h in which the oil is under the status of output. Inlet and outlet 20-58