Valve Block to Pump Connecting Hose

Hose 42593 is a flexible hydraulic line connecting the valve block to the pump in Kranzle B 230T, B 240T and B 270T petrol engine pressure washers. Unlike the rigid Ermeto tubes used in electric washers, the flexible hose compensates for petrol engine vibration and differences in the alignment of the valve block and pump axes – particularly important with single-cylinder engines and their characteristic vibration pattern. The hose carries working water under the pump's full working pressure between both hydraulic circuit components.

Application

The hose is mounted between the valve block and the pump – one end connected to the valve block outlet, the other to the pump inlet or vice versa, depending on the hydraulic circuit configuration in the specific model. The flexibility of the hose eliminates mechanical stress from petrol engine vibration, which with a rigid pipe connection would lead to material fatigue and cracking at connection points. A single hose fits all three B series models (230T, 240T, 270T), indicating an identical hydraulic circuit geometry across this family.

Replaced when there is a leak at the connection to the block or pump, when the hose material cracks or hardens, or when the body is mechanically damaged.

Symptoms – when to replace

• Water leak at the hose connections – on the valve block or pump side – under working pressure or immediately after it drops.
• Visible cracking, bulging or crumbling of the hose material – particularly at the ends and crimps, where the material is most stressed.
• Hose has hardened and lost elasticity – with petrol engines producing intense vibration, a rigid hose transfers these vibrations to the connections and accelerates wear.
• Leak at the hose end crimps – a deformed or corroded crimp no longer holds the end fitting under working pressure.
• Visible chafing or mechanical damage to the outer hose layer from contact with engine components or the housing.

How to select the right part

Identify by reference number 42593 and washer model – B 230T, B 240T or B 270T. Three models in this series use the same hose, confirming identical block-to-pump connection geometry. The hose has a defined length and end configuration – when ordering a replacement from outside the Kranzle catalogue, compare the length, internal diameter and end fitting type with the removed component.

Verify the end fitting type – crimped, threaded or with a quick connector – on the removed hose before ordering. An incorrect end fitting type will prevent correct connection to the block or pump.

Compatibility

Flexible hydraulic hose for Kranzle petrol engine pressure washers: B 230T, B 240T and B 270T. Connects the valve block to the pump. Verify the exact compatibility range by reference number 42593.

[faq]

Why is a flexible hose used in a petrol engine washer instead of a rigid hydraulic tube as in electric washers?|A petrol engine generates distinct impulse vibrations – particularly at low speed and during start-up. A rigid hydraulic tube in such a system would act as a lever transmitting these vibrations directly to the valve block and pump connections, leading to fatigue cracks at the joints. A flexible hose absorbs these vibrations and compensates for small mutual displacements between the block and the pump resulting from engine vibration during operation.

How does hose 42593 differ from Ermeto tube 410411 – both connect the valve block to the pump?|Ermeto tube 410411 is a rigid metal tube with factory-fitted Ermeto connectors – used in electric washers, where the absence of petrol engine vibration allows a rigid connection. Hose 42593 is a flexible hydraulic line – used in B series petrol washers, where flexibility is a necessity. Both carry water under full working pressure, but by completely different means. They are not substitutes for each other.

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