LHK, ADM and VDM, DV series overflow valves-Fornitore globale

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LHK, ADM and VDM, DV series overflow valves

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HAWE LHK series balance valve
A balance valve is a pressure valve used to control the pressure on the return side of bidirectional actuators. It maintains the lock of the return oil at its set pressure (set pressure is about 15% greater than the maximum load pressure), and overcomes the moving load pressure. Only when the remaining pressure forces the pump to "push" and suction the medium inside the valve, can it unload. Maximum pressure Pmax=450bar, maximum flow Qmax=250 l/min

HAWE DV and AS series pilot operated relief valves

The HAWE DV pressure valve belongs to a pilot operated structure, mainly composed of a main relief valve and a pilot valve. DV type valves can function as pressure limiting valves, differential pressure reducing valves, and sequence valves depending on whether the oil leakage from the pilot valve is internal to port R (A) or external to port X (L). By connecting auxiliary valves to the control chamber, the DV valve can achieve functions such as unloading and multi-stage pressure. Compared with DV valve, HAWE AS pilot operated relief valve also has a one-way valve connected to the actuator interface. Unlike DV type pressure valves, AS type pressure valves are equipped with a one-way valve at the interface with the actuator. The maximum pressure Pmax=420 bar and the maximum flow Qmax=120 l/min.

HAWE LV and ALZ series unloading valves

HAWE LV and ALZ series unloading valves are used to switch the pump flow to the bypass circuit when the system pressure reaches the set value, that is, the unloading state. At this point, the one-way valve isolates the actuator from the bypass path, which is the oil path from P to R. When the pressure on the actuator side reaches 13% of the set value, the valve will interrupt unloading again. This type of unloading can be divided into direct acting unloading valves (LV type) or pilot operated unloading valves (ALZ type). The unloading valve introduced here can be used as an accumulator loading valve in most cases and should be installed near the pump as much as possible.
The maximum pressure Pmax is 350 bar, and the maximum flow rate Qmax is 120 l/min.

HAWE ADM and VDM series pressure reducing valves

HAWE ADM direct acting pressure reducing valve and VDM hydraulic pilot pressure reducing valve. Its function is to ensure that the output pressure maintains a stable and constant value when the input pressure changes (DIN ISO 1219-1 standard). When switching from a higher pressure (primary circuit) to a lower pressure (secondary circuit), this pressure reducing valve can be used. It ensures that the pressure in the low-pressure circuit is not affected by the pressure in the high-pressure circuit. Due to functional limitations, the existing leakage flow must flow back to the fuel tank through the R port without pressure in various situations. The reverse flow is about 50% of the maximum flow. For high flow rates, consideration should be given to setting up bypass check valves. If the secondary pressure exceeds the set value due to the influence of external forces, this direct acting pressure reducing valve (ADM type) has an overload balancing effect (acting as a pressure limiting valve).
The maximum pressure Pmax at port P is 300 to 400 bar, the maximum pressure Pmax at port A is 250 to 400 bar, and the maximum flow rate Qmax is 120 l/min.

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