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DA10-1-30 Pilot-operated Unloading Valve is China Dz Pilot Valve, it is rare stype of Hydraulic Valves.
Model Meaning
- DA: It represents the series model of the pilot-operated unloading valve.
- 10 usually indicates that the NG is 10, The NG affects the flow passing capacity of the valve.
- 1: Generally refers to the adjusting handle, which is used for manually adjusting the relevant parameters of the unloading valve.
- 30: Represents the series number. The internal structures and connection dimensions of the valves in the same 30 series are the same, which is convenient for interchange and integration in the system.
Structural Composition
The pilot-operated unloading valve mainly consists of a pilot valve, a main valve and a check valve. The pilot valve is used to control the opening and closing actions of the main valve. There are damping holes inside it. When high-pressure oil enters the oil holes of the pilot valve, a pressure difference is generated through the damping holes to control the movement of the pilot valve spool. The main valve includes components such as the main valve spool and springs. The main valve spool realizes the on-off control of the main oil circuit under the action of spring force and oil pressure. The check valve is used to prevent the backflow of oil and ensure the normal operation of the system.
Jinhai is professional manufacturer of Various types of Directional Control Valves, Flow Control Valves, Pressure Control Valves and Accessories, Should you have any questions please feel free to come back to us.
DA/DAW pressure control valve is a pilot unloading valve.
They are used to charge accumulators, or to unload low pressure pumps in high/low pressure pump systems.
The composition of the unloading valve mainly includes a main valve (1) with a main valve core assembly (3) with a force adjustment 2) and a one-way valve (4). In size 10 valves, the non-return valve (4.1) is in the main valve (1). In size 25 and 32 valves, the non-return valve (4.2) is in a separately mounted subplate below the main valve.
DA type unloading valve
The flow of the pump is switched from P to A to P to T.
The pump delivers oil to the hydraulic system (P-A) through the check valve (4). The pressure of oil port A enters the pilot control spool (6) through the control oil circuit (5). At the same time, the pressure of oil port P enters the loading side of the main spool (3) and the ball valve (9) in the pilot (2) through the orifice (7) and (8). The pressure of A reaches the pressure set by the pilot valve , the ball valve overcomes the elastic (10) and leaves its valve seat. The oil flows into the elastic chamber (11) through the orifice (7) and (8) at this time. The oil in the elastic chamber may be discharged through the control oil circuit (12) (in DA...5X/... valves), or externally to the mailbox via the control circuit (13) (in DA...5X/Y... valves). Due to the orifice (7) and (8), there is a drop in the upper and lower chambers of the main valve core (3), so that the main valve leaves its valve seat and opens the oil ports P to T. The check valve (4) closes the oil ports A to P at this time The ball valve (9) is now held open by the force passing through the pilot spool (6).
Pump flow switches from P to T to P to A.
The area of the pilot spool (6) is 10% (or optional 17%) larger than the effective area of the ball "9" on the seat. Therefore, the effective force acting on the pilot spool is 10% or 17% greater than the effective force acting on the ball valve.
The spring (10) pushes the ball valve (9) against the seat when the pressure drop of the actuator (system) is equal to the conversion ratio. At this time, the pressure acting on the spool (3) works together with (14) to close the main spool (3) and isolate P to T. The flow of the pump is again fed into the hydraulic system (P to A) via the check valve (4).
DAW type unloading valve
The function of this valve is basically the same as that of the DA type valve. Only the solenoid valve (15) is installed on the pilot valve, which can arbitrarily complete the conversion from P to A or P to T under the switching pressure set by the pilot valve.
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Main Product:
Hydraulic Valves,
Solenoid Valve,
Solenoid Control,
Direction Control Valve ,
Pressure Control Valve,
Flow Control Valve
