Frequently asked questions

Push force is F = P × A: system pressure times piston area. Example: a Ø100 mm bore at 200 bar produces about 157 kN (16 tonnes) of push force. For pull force the rod cross-section is subtracted. Our online configurator calculates this live, together with buckling check and seal recommendation.

A single-acting cylinder applies hydraulic pressure in one direction only; the return stroke comes from the load or a spring (common on tippers and lifting platforms). A double-acting cylinder is pressurised in both directions and is used where controlled force is needed in push and pull (construction machinery, presses, industrial machines). HPS manufactures both types in the Ø25–320 mm bore range.

A telescopic cylinder consists of multiple nested stages and delivers a stroke several times its closed length. It is the right choice when installation space is limited but a long stroke is required: tipper trucks, refuse vehicles, mobile elevating platforms. HPS manufactures telescopic cylinders with 2 to 7 stages and 100–12,600 mm total stroke.

Industrial cylinders: bore 25–320 mm, rod diameter 15–250 mm and stroke 100–7,000 mm, with a buckling check on long strokes. Telescopic cylinders: 2–7 stages and 100–12,600 mm total stroke, with bore and rod to drawing. Nominal pressure is 250 bar as standard, with higher pressures to drawing. Test pressure follows the drawing, otherwise 1.5 × nominal pressure (ISO 10100).

Rule of thumb: NBR for standard applications (≤90°C), HNBR where higher temperature resistance is needed (~120°C), polyurethane (PU) for heavy-duty wear resistance at high pressure, FKM for high temperatures and aggressive fluids, PTFE for low friction and high speeds. Final selection is verified by engineering against pressure, temperature and fluid profile; the seal finder on our site does the first screening automatically.

Pressure testing follows ISO 10100 unless the drawing states otherwise; system safety follows ISO 4413. The barrel tube is EN 10305-1 E355, and EN 10204 3.1 inspection certificates for tube and rod are available on request. Mounting types use ISO 6099 coding. HPS holds ISO 9001, ISO 14001, ISO 45001 and ISO 10002 certificates.

Every cylinder is pressure-tested and checked for leakage and function before dispatch. Test pressure follows the drawing, otherwise 1.5 × nominal pressure (ISO 10100). On the test bench we check internal and external leakage, full-stroke function and dimensions. Our test bench works up to 400 bar as standard. A test record and EN 10204 3.1 inspection certificates for tube and rod are available on request.

Barrel: honed tube, EN 10305-1 E355, bore tolerance H8 or H9 as agreed. Piston rod: C45E (Ck45) or 42CrMo4, hard-chrome plated to min. 20 µm per side (40 µm on the diameter), typically 30 µm per side. Heads and pistons are C45; caps and other welded parts are weldable St52. EN 10204 3.1 inspection certificates for tube and rod are available on request.

Design includes an Euler buckling analysis: the minimum safe rod diameter is calculated from stroke, pressure and mounting configuration. If inadequate, the solutions are a thicker rod, a larger bore, a stop tube, or a different mounting geometry. The HPS configurator runs this check automatically and suggests alternatives when needed; industrial strokes up to 7,000 mm are validated with this analysis.

Yes, cylinders built to the customer's drawing are one of our core product families. Customer drawings (PDF/DWG/DXF/STEP) go directly into production engineering; without a drawing, we dimension an existing sample cylinder and produce manufacturing drawings by reverse engineering. Process: request → engineering review → approval drawing → prototype → series production. Once the prototype is approved, we produce in series.

We export directly to 49 countries on four continents: Europe, the CIS, the Gulf and Middle East, Asia (China, Pakistan), North Africa and the Americas. The customs tariff (HS) code is 8412.21. Delivery terms are agreed per project as EXW, FCA, CIP, CIF or DAP; shipments go by road, sea and air freight.

Our core model is direct OEM supply: we produce series cylinders to customer drawings for manufacturers of tippers, refuse vehicles, mobile platforms, forklift attachments, agricultural and construction machinery. Our sector pages show typical cylinder types and technical data; series production starts after you approve the sample and the product specification. Machining, welding, assembly and pressure testing are done in-house on our 20,000 m² site; telescopic stage tubes are hard-chrome plated on our own line, with approved platers for extra capacity.

Use the form on the contact page: cylinder type, bore-rod-stroke, working pressure, mounting style and quantity are enough; a technical drawing (PDF/DWG/DXF/STEP, up to 15 MB) can be attached. A configuration made in the online configurator transfers to the form in one click.

Yes. We build construction-machinery and equipment cylinders compatible with OEM dimensions: the part number and basic dimensions (bore-rod-stroke, mounting) are enough; a photo or drawing of the existing cylinder speeds things up. Manufacturer part numbers are cross-matched on request; every cylinder is tested before dispatch, and EN 10204 3.1 inspection certificates for tube and rod are available on request.

Without a specification the HPS standard applies. The material (NBR/PU/HNBR/FKM/PTFE) is selected for operating temperature and pressure; just state your preferred brand in the RFQ.