Match a 4SH hose by checking two requirements separately: the inside diameter must suit the required flow, and the hose’s rated working pressure must meet or exceed the highest pressure expected in service. Do not choose a hose from its size alone: EN 856 4SH pressure ratings can vary by nominal bore and manufacturer, so confirm the exact size and rating in the supplier’s product data. Then check pressure surges, temperature, fluid compatibility, fittings, and the burst-pressure requirement for your system. As a calculation example, a 350 bar working-pressure requirement and a specified 4:1 burst-to-working ratio imply a minimum burst pressure of 1,400 bar; that ratio must be confirmed against the applicable specification.
4SH identifies a spiral-reinforced hydraulic hose construction; the size refers to its nominal bore, usually stated in millimetres or as a dash size. The bore affects flow capacity and pressure loss. It does not, by itself, confirm that the hose can safely handle a particular working pressure. Check the manufacturer’s stated dimensions because nominal size and measured internal diameter are not always identical.
For example, a nominal 13 mm bore is commonly associated with a -8 dash size, but product dimensions should be verified before ordering. Hose routing, length, fluid viscosity, and flow rate also affect pressure loss and performance. If a hose is too small for the required flow, the resulting restriction can contribute to heat and system inefficiency. If it is unnecessarily large, it may add cost, weight, or routing difficulty.
Working pressure is the maximum pressure rating for normal operation stated by the hose manufacturer. Burst pressure is a destructive-test value or specified minimum used to describe the pressure at which a hose may fail; it is not a permissible operating target. A hose should not be operated at burst pressure, nor should burst pressure be treated as extra working-pressure capacity.
Some hydraulic hose specifications use a 4:1 burst-to-working ratio, but buyers should confirm the required ratio and test basis in the applicable standard, purchase specification, or supplier documentation. Ratings can depend on hose size and construction. The assembled hose may also be limited by its fittings, crimp, or installation, so the hose-tube rating alone is not enough.
Record the system’s maximum operating pressure, not just its usual pressure or pump setting. Include known pressure peaks, load changes, valve events, and the equipment manufacturer’s limits. If the pressure fluctuates and the peak is unknown, ask the system designer or equipment supplier to establish a defensible maximum before selecting a hose.
Keep units consistent when comparing requirements with a data sheet. For reference, 1 MPa equals 10 bar, so 35 MPa equals 350 bar. This conversion is useful for reading product tables, but it does not replace checking whether the stated rating applies to the exact hose size and assembly.
Use the required flow rate and an appropriate fluid-velocity target to estimate bore, then confirm the result with the equipment or system designer. As an illustration only, a flow of 40 L/min at a selected velocity of 5 m/s gives an estimated internal diameter of about 13 mm. The chosen velocity is an example input, not a universal recommendation; acceptable velocity depends on the hydraulic circuit and application.
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After estimating the bore, check the manufacturer’s dimensional data, pressure-loss considerations, hose length, and fitting size. A correct pressure rating cannot compensate for an unsuitable flow diameter. Likewise, a suitable bore does not prove that the pressure rating is adequate.
Find the manufacturer’s EN 856 4SH table and locate the precise nominal size. Compare its rated working pressure with the system’s maximum required working pressure, ensuring the manufacturer’s rating is stated for the relevant product and conditions. Do not assume that all sizes in a product family share one pressure rating, or transfer a rating from another manufacturer’s hose.
For instance, if a system requires 350 bar working pressure and its specification requires a 4:1 burst-to-working ratio, the corresponding minimum burst-pressure calculation is 350 × 4 = 1,400 bar. This is a requirement-checking example, not a claim that every 4SH hose in every size has that rating. Confirm the hose’s published values and the project’s applicable test criteria before approval.
Review the operating temperature range, hydraulic-fluid compatibility, external environment, bend radius, and routing. Temperature and other service conditions can affect the suitability of a hose and may require the manufacturer’s guidance. Check that the couplings, crimp specification, and assembly rating are compatible with the selected hose and system pressure.
Where a hose will experience frequent pressure cycling, vibration, tight routing, or a challenging environment, include those conditions in the selection review. Confirm fitting material and connection type against the equipment interface. A hose that matches the pressure table can still be unsuitable if the assembly or installation is incorrect.
To receive a useful selection review, provide the nominal bore or required flow rate, maximum working pressure, pressure-pulse information if available, fluid type, operating-temperature range, hose length, and fitting details. Include the applicable specification and any required burst-pressure ratio or test documentation. If some values are unknown, identify them as unknown instead of substituting estimates without approval.
At Hengshui Xinchi Hose Manufacturing Co., Ltd., we can review these application details and help buyers compare the requested 4SH size with the relevant product data. For a quotation or technical discussion, share the required dimensions, pressure conditions, fluid, temperature, and end connections. This gives our team a clearer basis for confirming product suitability and identifying information that still needs verification.
To match 4SH hose size to working and burst pressure, first size the bore for the required flow, then verify that the exact hose size has a manufacturer-rated working pressure suitable for the system’s maximum pressure. Check burst pressure against the project’s specified ratio and test requirements; do not use it as the normal operating limit. Before placing an order, confirm service conditions and the rating of the complete hose assembly, including fittings. The practical next step is to compare your system data with the supplier’s exact-size product table and resolve any missing pressure or application details before approval.
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