HAWE pressure valve series product introduction

HAWE Harvey LHK series balancing valve
The HAWE balancing valve is a pressure valve that controls the pressure on the return side of the two-way actuator. It maintains the oil return lock at its set pressure (set pressure is greater than 15% of the maximum load pressure) and overcomes the moving load pressure. Only the residual pressure forces the pump to "push" and draw the medium in the valve to unload. Maximum pressure Pmax=450bar Maximum flow rate Qmax=250 l/min

HAWE Harvey MV and SV series direct-acting relief valves and differential pressure reducing valves
The pressure valve primarily controls the pressure in the hydraulic system. The HAWE Harvey MV and SV series of direct-acting relief valves and differential pressure reducing valves described here are designed for the following functions:
Pressure limiting valve (safety valve or relief valve): This valve prevents the hydraulic system from exceeding the maximum allowable pressure or limiting the working pressure.
Differential Pressure Reducing Valve: This valve produces a smooth differential pressure between the inlet and outlet of the flow.
In order to make the system run smoothly, direct-acting pressure valves are generally fitted with damping, but for special operating conditions, valves with undamped construction can be used. Depending on the pressure vessel regulations, a pressure limiting valve that has been tested must be used as a safety valve for the vessel (accumulator) in the hydraulic system.
Maximum pressure Pmax = 700 bar Maximum flow rate Qmax = 5 to 160 l/min.

HAWE Harvey CMV and CSV Series Relief Valves
HAWE Harvey CMV type relief valve is used to protect the equipment from excessive pressure or limit the working pressure. The pressure can be limited to 500 bar. The flow rate varies from 20 to 60 l/min depending on the size of the valve. Not waiting.
HAWE Harvey CMV X type undamped pressure limiting valve is used for special occasions, for example: to prevent the hydraulic pressure in the sealed cylinder chamber from rising due to temperature rise or forced creep movement of the piston due to external force. . The hysteresis between pressure opening and pressure closing is small.
HAWE Harvey CSV type differential pressure reducing valve maintains a substantially constant pressure difference between the inlet and outlet of the valve as the flow passes. The return is achieved by a bypass check valve. The pressure is up to 315 bar and the flow rate is between 40 and 60 l/min depending on the size of the valve.

HAWE Harvey DV and AS series pilot operated relief valves
The HAWE Harvey DV pressure valve is a pilot-operated structure consisting mainly of a main relief valve and a pilot valve. According to whether the drain of the pilot valve is leaked to the R (A) port or leaked to the X (L) port, the DV valve can function as a pressure limiting valve, a differential pressure reducing valve and a sequence valve. By connecting the auxiliary valve to the control chamber, the DV valve can perform functions such as unloading and multi-stage pressure.
The HAWE Harvey AS pilot operated relief valve has a one-way valve that is connected to the actuator interface as compared to the DV valve. Unlike the DV type pressure valve, the AS type pressure valve is fitted with a one-way valve at the interface with the actuator.
Maximum pressure Pmax = 420 bar Maximum flow rate Qmax = 120 l/min.

HAWE Harvey VR series one-way back pressure valve
The HAWE Harvey VR series one-way back pressure valve is a differential pressure reducing valve. It produces a smooth differential pressure between the inlet and outlet of the flow. Directional flow (reflow) can be achieved by integrating a bypass check valve. When the valve is in the home position, it is "spooled" from the V to the F direction. The pressure valve can be installed as a safety valve in the hydraulic system of the forklift to prevent malfunction of the forklift bracket or as a back pressure valve installed in the return line of the hydraulic system to produce a high (damping) return flow. Back pressure.
Maximum pressure Pmax = 300 bar Maximum flow rate Qmax = 120 l/min.

HAWE Harvey PDV and PDM series proportional relief valves
HAWE Harvey PDV and PDM series proportional relief valves are used to control the pressure of the hydraulic system, and can realize electric proportional remote control, so as to limit the safe operation of the highest pressure protection system. Its applications mainly include: 1. Used in high voltage systems to improve the life of pressure control devices. 2. For very low pressure (0 to 5 bar) applications, the adjustability of the valve can be maintained by means of control pressure. 3. It is used in the main circuit of high-pressure system, which can keep pressure for a long time without loss of control oil.
Maximum pressure Pmax = 700 bar Maximum flow rate Qmax = 120 l/min.

HAWE Harvey ADC and AM series small pressure reducing valve
HAWE Harvey ADC and AM series small pressure reducing valves are threaded cartridge structures for small flow control loops that maintain a constant output pressure at high input pressure fluctuations. Where a higher pressure (primary circuit) is to be converted to a lower pressure (secondary circuit), a pressure relief valve is required to achieve pressure regulation and does not affect the higher pressure in the primary circuit. Due to the function, the existing leak must be returned to the tank without pressure in the R port under various conditions. The reverse flow is approximately 30% of the maximum flow. A bypass check valve should be considered for large flow rates. If the secondary pressure is affected by external forces and exceeds the set value, the pressure reducing valve has an overload balance function (starting the pressure limiting valve).
The maximum pressure of P port is Pmax=300 to 400 bar, the maximum pressure of port A is Pmax=15 to 70 bar, and the maximum flow rate Qmax=2 to 10 l/min.

HAWE Harvey ADM and VDM series pressure reducing valves
HAWE Harvey ADM direct acting pressure reducing valve and VDM hydraulic pilot operated pressure reducing valve. Its function is to ensure that the output pressure maintains a constant value (DIN ISO 1219-1) when the input pressure changes. This type of pressure reducing valve can be used when switching from a higher pressure (primary circuit) to a lower pressure (secondary circuit). It makes the pressure in the low pressure circuit unaffected by the pressure of the high pressure circuit. Due to the function, the existing leakage flow must be returned to the tank without pressure through the R port under various conditions. The reverse flow is about 50% of the maximum flow. A bypass check valve should be considered for large flow rates. If the secondary pressure exceeds the set value due to external force, the direct-acting pressure reducing valve (ADM type) has an overload balance function (starting the pressure limiting valve).
The maximum pressure of P port is Pmax=300 to 400 bar, the maximum pressure of port A is Pmax=250 to 400 bar, and the maximum flow rate is Qmax=120 l/min.

HAWE Harvey CDK, DK and DZ series pressure reducing valves
HAWE Harvey CDK, DK and DZ series pressure reducing valves are direct-acting pressure reducing valves, compared with the traditional sliding valve type pressure reducing valves (with internal leakage, need to connect the drain pipe), CDK type two-way decompression The valve is a cut-off structure, so there is no leakage in the closed state, and it has an overload balance effect (the spool type does not have this effect). The reverse flow is about twice the maximum flow. Another advantage is that the mounting holes are extremely easy to machine. A further feature of the DK type is its initial pressure switch, ie its pressure and switch are simultaneously controlled by an adjustment element.
The maximum pressure of P port is Pmax=500 bar, the maximum pressure of port A is Pmax=400 bar, and the maximum flow rate is Qmax=15 l/min.

HAWE Harvey PM series small proportional pressure reducing valve
The HAWE Harmony PM series of small proportional pressure reducing valves control other hydraulic components (eg directional valves) in the hydraulic system with their variable control pressure and low oil volume. At interface A, the secondary pressure associated with current quantity control does not depend on the output pressure of the pump, but there is a linear relationship between the pressure at the A interface and the current input signal. Due to the function, the existing leakage must be returned to the tank without pressure through the R port. When the secondary pressure exceeds the set value by the external force, the pressure reducing valve of this type has an overload balance function (acting as a pressure limiting valve).
The maximum pressure of P port is Pmax=40 bar, the maximum pressure of port A is Pmax=19 bar, and the maximum flow rate is Qmax=2 l/min.

HAWE Harvey PDM series proportional pressure reducing valve
The function of the HAWE Harvey PDM series proportional pressure reducing valve is to convert the high and fluctuating input pressure into a substantially constant output pressure (port A) according to the corresponding control current, thereby realizing the high pressure oil circuit (primary circuit) to the low pressure oil. The pressure of the circuit (secondary circuit) is regulated and does not affect the higher pressure in the primary circuit. Due to the function, the leakage flow must be connected to the L port without pressure to the tank. The reverse flow is about 50% of the maximum flow. Consider a bypass check valve when handling large flows. When the secondary pressure is affected by external force and exceeds the set value, the valves of specifications 11 and 21/22 have an overload balance function (pressure limiting valve action).
The maximum pressure of P port is Pmax=420 bar, the maximum pressure of port A is Pmax=5 to 350 bar, and the maximum flow rate is Qmax=120 l/min.

HAWE Harvey CNE 2 Series Unloading Valve
HAWE Harvey CNE 2 series unloading valve is a screw-in type pressure control two-way valve. Its function is in the double pump system. When the low pressure circuit reaches the set pressure and the high pressure pump is running in the combined flow line. When this setting is exceeded, the low pressure circuit is switched to the unloading state. By controlling the oil circuit, the high pressure oil forces the valve to open, thereby keeping the system unloaded. The valve acts as a relief valve simultaneously in the low pressure circuit.
The maximum pressure of P port is Pmax=500 bar, the maximum pressure of port A is Pmax=450 bar, and the maximum flow rate is Qmax=30 l/min.

HAWE Harvey NE series double stage valve
HAWE Harvey NE series two-stage valves are used in hydraulic systems consisting of double pumps (high and low pressure pumps). It combines two independent output flows into a common flow output. When the preset low pressure parameter is reached, the low pressure oil line can be switched to the unloading state and the two stage pump can be prevented from exceeding its set pressure. The valve can be applied to a control cylinder consisting of a three-position three-way or three-position four-way reversing valve. The valve can be used with the CR-type control valve for control of single-acting and lower-piston presses, depending on demand.
Maximum pressure Pmax = 500 to 700 (HP) / 30 to 60 (NP) bar, maximum flow rate Qmax = 25 (HP) / 180 (NP) l / min.

HAWE Harvey LV and ALZ series unloading valves
HAWE Harvey LV and ALZ series unloading valves are used when the system pressure reaches the set value, the unloading valve switches the pump flow to the bypass circuit, ie the unloading state. At this time, the check valve blocks the actuator from the bypass path, that 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 the unloading again. Such unloading can be divided into a direct acting unloading valve (LV type) or a pilot type unloading valve (ALZ type). The unloading valve described here can be used as an accumulator loading valve in most cases and should be installed as close as possible to the pump.
The maximum pressure Pmax = 350 bar and the maximum flow rate Qmax = 120 l/min.

HAWE Harvey DSV and CDSV series pressure lock valves
HAWE's DSV and CDSV series pressure lock valves are used to lock the flow to the downstream actuator B port without leakage when the pressure in the actuator oil circuit reaches and exceeds the set value. . When the pressure on the side of the interface A is lower than the set value of the spring, the valve will be reopened. The CDSV type pressure lock valve is also a screw-in cartridge valve with extremely easy installation hole machining and is mainly used as a pressure gauge protection valve.
The maximum pressure Pmax = 600 bar and the maximum flow rate Qmax = 60 l/min.