Rexroth DBW10b2-5x /315-6EG24N9K4 REXROTH solenoid relief valve hydraulic proportional control valvehydraulic pressure
Electromagnetic relief valve features:
Compared with the three-section concentric structure, the characteristics of the two-section concentric structure are: (1) the main spool only with the valve sleeve and the main seat concentricity requirements, removed with the valve cover, so the structure is simple, convenient processing and assembly. (2) large flow area, in the case of the same flow, the main valve opening height is small; Or in the case of the same opening height, the flow capacity is large, so it can be small in size and light in weight. ③ The main spool and valve sleeve can be generalized to facilitate the organization of mass production.
Function of electromagnetic relief valve:
In the restricted-flow pump throttling system, the restricted-flow pump provides a constant flow rate. When the system pressure increases, the flow demand will decrease. At this time, the relief valve is opened, so that the excess flow back to the tank, to ensure that the relief valve inlet pressure, that is, the pump outlet pressure is constant (valve port often open with pressure fluctuation).
Pressure stabilizing effect: the relief valve is connected in series on the oil return road, and the relief valve produces back pressure, which increases the smoothness of the moving parts.
Unloading function of the system: the remote control port of the relief valve is connected with the overflow small flow solenoid valve in series. When the electromagnet is energized, the remote control port of the relief valve is connected to the oil tank, and the hydraulic pump is unloaded at this time. The relief valve is then used as the unloading valve.
Protection: the valve is closed when the system is working normally. Only when the load exceeds the specified limit (system pressure exceeds the setting pressure), open overflow, overload protection, so that the system pressure increases (usually the setting pressure of the relief valve is 10% ~ 20% higher than the system's highest working pressure).
In practical application, there are generally: for unloading valve, for remote pressure regulating valve, for high and low pressure multistage control valve, for sequential valve, used to produce back pressure (string in the oil return).
REXROTH relief valve generally has two kinds of structure: 1, direct acting relief valve. 2, pilot relief valve.
The main requirements of relief valve: large pressure regulating range, small pressure regulating deviation, small pressure oscillation, sensitive action, large overload capacity, low noise.
The sealing ring of REXROTH solenoid valve is installed in the inner cone, with the opposite side of the medium into a certain Angle, the medium pressure to the inner cone, and transferred to the sealing ring, at a certain Angle of the cone, two components, one parallel to the valve body line outward, another pressure to the inner wall of the valve body. The latter component is the self-tightening force. The greater the medium pressure, the greater the self-tightening force. Therefore, this type of connection is suitable for high pressure valves. REXROTH solenoid valve than flange connection, to save a lot of material and manpower, but also need a certain pre-tightening force, so that the valve pressure is not high, reliable use. There are many forms of REXROTH solenoid valve connection, such as some do not have to remove the small valve, welded together with the pipe; Some non - metallic valves, socket connection, etc. Valve users should be treated according to the specific situation.
REXROTH solenoid valve type usually should represent the valve type, drive mode, connection form, structural characteristics, sealing surface material, body material and nominal pressure and other elements. The standardization of valve type provides convenience for the design, selection and sale of valve. REXROTH solenoid valve installation: before the valve installation, should carefully check the valve model, specifications and design; Check whether the valve can be used under the required conditions according to the valve model and factory manual; REXROTH solenoid valve lifting, rope should be tied to the valve body and cover of the flange joint, and not tied to the handwheel or stem, so as not to damage the stem and handwheel; When installing valve in horizontal pipe, the valve stem should be vertical upward, do not allow the valve stem downward installation; REXROTH solenoid valve installation, shall not be used to forcibly pull the connection mode, so as not to cause damage due to uneven force; Open stem gate valves should not be installed in underground damp places to avoid stem corrosion.