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FIMA 2020

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Two stage valves type NE HAWE

Two stage valves type NE HAWE

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Availability : Preorder, usually dispatched in 3 weeks


420,90 €

Two stage valves are employed in hydraulic systems fed by two stage pumps (high pressure / low pressure pumps). They combine the two pumps to form a common pressure circuit, switch the low pressure stage to non-pressurized circulation upon reaching a predetermined low pressure value and safeguard both pumps from exceeding the set high/low pressure values. They are used in conjunction with 3/3- or 4/3-way directional spool valves for controlling preferably hydraulic cylinders. Bottom-ram presses or single-acting hydraulic cylinders with deadweight or independent return traverse (return springs) are expediently controlled by switch units CR to according to pamphlet 7150.

Design: Combinations of ball-type seat check valves incorporating ball-type seat and piston pressure limiting valves.

Pipe connection: HP and A: Series S threaded pipe connections, DIN 2353 / ISO 8434-1.

                         NP and R: Series L threaded pipe connections, DIN 2353 / ISO 8434-.

Installation position: Any

Pressure fluid: Hydraulic oil conforming DIN 51524 part 1 to 3: ISO VG 10 to 68 conforming DIN 51519. Viscosity limits: min. approx. 4, max. approx. 1500 mm2/s, opt. operation approx. 10... 500 mm2/s. Also suitable for biological degradable pressure fluids types HEPG (Polyalkylenglycol) and HEES (Synth. Ester) at service temperatures up to approx. +70°C. Temperature: Ambient: approx. -40 ... +80°C;  Fluid: -25 ... +80°C;  Note the viscosity range ! Permissible temperature during start: -40°C (Note start-viscosity!), as long as the service temperature is at least 20K higher for the following operation. Biological degradable pressure fluids: Note manufacturer's specifications. By consideration of the compatibility with seal material not over +70°C.

Subsequent pressure adjustment

Do not a make any subsequent pressure settings of adjustments without checking the pressure with a pressure gauge! The pressure adjustment values per revolution or per millimeter of set length on the setting spindle are only approximate values giving a rough indication ot the desired operating position. Caution: For perfect functioning of the low pressure switch-over circuitry, take care that the high pressure setting must always be above the low pressure setting. This also applies when, for example, the hydraulic installation is not initially to be operated at the high pressure planned. Before adjusting the low pressure setting, always check the high pressure setting with a pressure gauge to ensure that it lies above the low pressure setting!

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