{"id":2289,"date":"2026-06-26T08:02:22","date_gmt":"2026-06-26T08:02:22","guid":{"rendered":"https:\/\/hydrauliccylindersprice.com\/?post_type=product&p=2289"},"modified":"2026-06-26T08:02:22","modified_gmt":"2026-06-26T08:02:22","slug":"cost-effective-double-acting-telescopic-hydraulic-cylinder-for-sale","status":"publish","type":"product","link":"https:\/\/hydrauliccylindersprice.com\/tr\/urun\/cost-effective-double-acting-telescopic-hydraulic-cylinder-for-sale\/","title":{"rendered":"Cost Effective Double Acting Telescopic Hydraulic Cylinder for Sale"},"content":{"rendered":"
\n

<\/p>\n

\n
\n
DOUBLE ACTING<\/span>
\nHYDRAULIC EXTEND + RETRACT<\/span><\/div>\n
\n
\n

Double Acting
\nTelescopic Cylinder
\nCost Effective \u2014 For Sale<\/span><\/h2>\n

A single-acting telescopic cylinder<\/a> extends under hydraulic pressure and retracts under gravity. A double-acting telescopic cylinder extends under pressure AND retracts under pressure \u2014 the operator has hydraulic control in both directions. This is the fundamental engineering distinction, and it determines whether the cylinder can be used in applications where gravity cannot reliably retract the stages.<\/p>\n<\/div>\n

\n
\n
Acting<\/span>Double<\/span><\/div>\n
Bore<\/span>2\u20136\u2033<\/span><\/div>\n
Stroke<\/span>4\u2013100\u2033<\/span><\/div>\n
Ports<\/span>G\/SAE\/NPT\/M<\/span><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

The double-acting telescopic hydraulic cylinder costs more than single-acting because it requires additional engineering: retract-side seals on every stage, internal oil passages that route hydraulic fluid to the retract chambers through nested stages, and a second hydraulic port. Korea Ever-Power manufactures the double-acting telescopic cylinder with optimised production processes that deliver this additional capability at competitive pricing \u2014 making double-acting cost effective for applications that genuinely require it.<\/p>\n<\/section>\n

\"Hydraulic\u00a0<\/p>\n

\n

Double Acting Telescopic Cylinder \u2014 Customisation Parameters<\/h2>\n
\n\n\n\n\n\n\n\n\n\n
Acting Type<\/td>\nDouble-acting \u2014 hydraulic extend AND hydraulic retract<\/td>\n<\/tr>\n
Bore \/ Rod \/ Stroke \/ Pin<\/td>\n2\u20136\u2033 \/ 1.125\u20134\u2033 \/ 4\u2013100\u2033 \/ 0.5\u20132\u2033 (all customisable)<\/td>\n<\/tr>\n
Port Options<\/td>\nG (BSP) \/ SAE \/ NPT \/ M \u2014 two ports required<\/td>\n<\/tr>\n
Body \/ Type<\/td>\nSteel \/ Multi-stage telescopic<\/td>\n<\/tr>\n
Hydraulic Lines<\/td>\n2 lines (extend + retract) \u2014 vs 1 line for single-acting<\/td>\n<\/tr>\n
Certification \/ Lead Time<\/td>\nISO 9001 \/ 25\u201335 days<\/td>\n<\/tr>\n
Warranty<\/td>\n1 year<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/section>\n

<\/p>\n

\"Double<\/section>\n

<\/p>\n

\n

How a Double-Acting Telescopic Cylinder Works \u2014 Hydraulic Power in Both Directions<\/h2>\n

In a single-acting telescopic cylinder, hydraulic oil enters one port and pushes the stages out sequentially. When the pressure is released, gravity pulls the stages back in \u2014 the weight of the dump body or load pushes the oil back out through the same port. There is no hydraulic force on the retract stroke. In a double-acting telescopic cylinder, there are two oil circuits: one pressurises the extend side of each stage piston, and the other pressurises the retract side. Reversing the directional control valve switches which circuit is pressurised, giving the operator hydraulic power in both directions.<\/p>\n

\n
Two Ports, Two Hose Lines<\/strong><\/p>\n

Single-acting has one port (extend). Double-acting has two ports: one for extend, one for retract. This means two hydraulic hose lines from the control valve to the cylinder, a double-acting directional control valve, and a hydraulic system that can supply flow in both directions. The hydraulic circuit on your vehicle or equipment must be compatible with double-acting operation before you specify a double-acting cylinder.<\/p>\n<\/div>\n

Internal Retract Passages<\/strong><\/p>\n

The most complex engineering feature of a double-acting telescopic cylinder is the internal oil passage system that routes retract-side hydraulic fluid through the nested stages. Each stage must have a sealed retract chamber, and the oil must flow from the retract port through passages or tubes that pass through the outer stages to reach the inner stages. This internal passage system is why double-acting telescopic cylinders are more complex and more expensive to manufacture than single-acting.<\/p>\n<\/div>\n

Retract-Side Seals on Every Stage<\/strong><\/p>\n

In a single-acting cylinder, only the extend side of each stage has pressure seals. In a double-acting cylinder, both the extend side and the retract side of every stage junction must be sealed \u2014 doubling the total seal count. More seals means more potential leak paths, but also means the cylinder has full hydraulic control in both directions. The retract-side seals experience lower pressure than the extend-side seals (the retract annular area is smaller), but they still require proper seal specification and installation.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

<\/p>\n

\n

When to Choose Double-Acting vs Single-Acting<\/h2>\n

Double-acting costs more and adds complexity. Choose it only when the application genuinely requires hydraulic retraction \u2014 do not specify double-acting “just in case” when single-acting would work.<\/p>\n

\n
Choose Double-Acting when:<\/strong><\/p>\n

The cylinder is mounted horizontally or at a shallow angle \u2014 gravity cannot retract the stages. The dump body or platform is lightweight (aluminium bodies, empty containers) and does not generate enough weight to push the stages in. The operator must control the retraction speed precisely \u2014 lowering a platform at a controlled rate, not a gravity free-fall. The cylinder must pull actively on the retract stroke \u2014 flatbed tilt mechanisms, press platens, clamping devices.<\/p>\n<\/div>\n

Stay with Single-Acting when:<\/strong><\/p>\n

The cylinder is mounted vertically under a loaded dump body \u2014 gravity reliably retracts the stages. The retraction speed is not critical \u2014 the body can lower at gravity speed. The application does not require the cylinder to pull on the retract stroke. The hydraulic system has only one hose line available (single-acting power unit). Cost and simplicity are priorities.<\/p>\n<\/div>\n<\/div>\n

Cost impact: <\/strong>
\nDouble-acting typically costs 20\u201340% more than single-acting at the same bore, stroke, and stage count \u2014 reflecting the additional seals, internal passages, and machining required. The premium is a manufacturing cost, not a margin increase. If your application can work with single-acting, single-acting saves cost without sacrificing performance.<\/span><\/div>\n<\/section>\n

<\/p>\n

\n

Double-Acting Telescopic Cylinder \u2014 Key Applications<\/h2>\n

\"Double<\/p>\n

\n
\n

Flatbed Tilt & Slide Mechanisms<\/h3>\n

The primary application for double-acting telescopic cylinders. Flatbed tow trucks tilt the bed to ground level for vehicle loading, then the bed must be pulled back to horizontal under hydraulic power for transport. Gravity alone cannot return a flatbed to level \u2014 double-acting is mandatory. Typically 2\u20133 stage at 2\u20134 inch bore, SAE or metric ports.<\/p>\n<\/div>\n

\n

Horizontal & Angled Mounting<\/h3>\n

Any application where the telescopic cylinder is mounted horizontally or at an angle less than approximately 20\u00b0 from horizontal. At these angles, gravity force on the stages is insufficient to overcome seal friction and retract reliably. Industrial equipment, hydraulic presses, agricultural implements with horizontal actuators \u2014 all require double-acting for reliable bi-directional operation.<\/p>\n<\/div>\n

\n

Controlled-Speed Lowering<\/h3>\n

Dump bodies carrying fragile or liquid loads that must be lowered gently \u2014 not dropped under gravity. Municipal waste containers, tank trailers, and food-processing tippers where the lowering speed must be controlled by the operator to prevent sloshing, spillage, or mechanical shock. Double-acting provides metered flow control on the retract stroke through the directional control valve.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

<\/p>\n

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OEM & ODM \u2014 Ordering Double-Acting Telescopic Cylinders<\/h2>\n
\n
\n
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What You Provide<\/h3>\n<\/div>\n
\n

Bore, rod, stroke, stage count, retracted length, mounting type, port thread for BOTH extend and retract ports (may be same or different thread standards), working pressure, retract pressure if different from extend, and application description. Confirm your hydraulic power unit is double-acting compatible with a 4-way directional control valve.<\/p>\n<\/div>\n<\/div>\n

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What Ever-Power Delivers<\/h3>\n<\/div>\n
\n

Drawing 2\u20133 days. Samples available. Production 25\u201335 days. 100% pressure test on BOTH extend and retract circuits with certificate. 1-year warranty. Contact Korea Ever-Power<\/a> for quotation \u2014 specify “double-acting” explicitly to ensure correct pricing and lead time.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

\"Telescopic<\/p>\n

Double-Acting Telescopic Cylinder \u2014 Technical FAQ<\/h2>\n
\n
\n

Is the retract force equal to the extend force?<\/h3>\n

No. The retract force is always lower than the extend force on a double-acting telescopic cylinder. On the extend stroke, hydraulic pressure acts on the full piston area. On the retract stroke, pressure acts on the annular area (piston area minus rod area) \u2014 which is smaller. The retract force is typically 35\u201370% of the extend force, depending on the rod-to-bore ratio. This is sufficient for retracting against friction and gravity, but not for pulling the same load that the cylinder can push.<\/p>\n<\/div>\n

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Can I convert a single-acting telescopic cylinder to double-acting?<\/h3>\n

No. Single-acting and double-acting telescopic cylinders have fundamentally different internal designs. A single-acting cylinder has no retract-side seals, no internal retract passages, and only one port. Converting it to double-acting would require adding seals, drilling passages, and adding a port \u2014 which is essentially a complete rebuild that costs more than purchasing a new double-acting cylinder. Always order the correct acting type from the start.<\/p>\n<\/div>\n

\n

Does double-acting affect the retracted length?<\/h3>\n

Yes, slightly. The retract port, internal oil passages, and additional seal grooves add approximately 10\u201325 mm to the retracted length compared to a single-acting cylinder at the same bore and stroke. This small increase is usually not critical, but should be verified against your available mounting space \u2014 especially on tight-frame applications where every millimetre counts.<\/p>\n<\/div>\n

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What directional control valve do I need for double-acting?<\/h3>\n

A 4-way (4\/3) directional control valve with centre-position hold (closed centre or float centre, depending on whether you want the cylinder to hold position or free-float when the valve is in neutral). Single-acting cylinders use a 3-way valve with a single work port. If your existing hydraulic system has only a 3-way valve, you must upgrade to a 4-way valve to operate a double-acting telescope cylinder. Contact Korea Ever-Power<\/a> if you need guidance on valve compatibility.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

<\/p>\n

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Field Reports<\/h2>\n
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\n
\n
K<\/div>\n
\n
Kevin R. \u2014 Flatbed Tow Truck Builder<\/div>\n
Verified Purchase \u00b7 Michigan, USA \u00b7 April 2025<\/div>\n<\/div>\n
\u2605\u2605\u2605\u2605\u2605<\/div>\n<\/div>\n

We build flatbed tow trucks \u2014 the bed tilts for vehicle loading, then the double-acting cylinder pulls it back to level. Single-acting is impossible for this application \u2014 the bed won’t return to horizontal under gravity alone because the tilt angle is only 8\u201310\u00b0. The Ever-Power double-acting 3-stage at 3-inch bore, 48-inch stroke, SAE ports has been running on 6 trucks for 7 months. Smooth extend, smooth retract, no leaks on either circuit. The 4-way valve integration was straightforward. Cost was about 25% more than their single-acting equivalent \u2014 a fair premium for the added complexity.<\/p>\n<\/div>\n

\n
\n
S<\/div>\n
\n
SteelPress AG \u2014 Industrial Press Manufacturer<\/div>\n
Verified Purchase \u00b7 Germany \u00b7 March 2025<\/div>\n<\/div>\n
\u2605\u2605\u2605\u2605\u2605<\/div>\n<\/div>\n

We use double-acting telescopic cylinders in horizontal mounting on our baling presses \u2014 the cylinder pushes waste material into the baling chamber (extend) and pulls the press platen back (retract). Gravity plays no role \u2014 the cylinder is completely horizontal. Ever-Power double-acting 2-stage, 4-inch bore, metric ports. The extend and retract pressure test results on the certificate confirmed both circuits hold at 1.5\u00d7. 15 units across 3 press models, all performing correctly. The cost-effectiveness versus European double-acting cylinder suppliers is significant \u2014 approximately 40% lower at equivalent quality.<\/p>\n<\/div>\n

\n
\n
N<\/div>\n
\n
Nadia K. \u2014 Agricultural Equipment Designer<\/div>\n
Verified Purchase \u00b7 February 2025<\/div>\n<\/div>\n
\u2605\u2605\u2605\u2605\u2606<\/div>\n<\/div>\n

Double-acting telescopic cylinder for an aluminium dump body on a lightweight agricultural trailer. The aluminium body is too light for gravity retraction \u2014 tried single-acting first and the stages would not retract fully. Switched to Ever-Power double-acting and the problem was solved immediately. Four stars because I should have specified double-acting from the start \u2014 the Ever-Power engineering team actually recommended it when they saw our body weight specification, but I overruled them. They were right.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

<\/p>\n

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Other Hydraulic Cylinder Categories<\/h2>\n
\n
\n

\"Forklift\"<\/p>\n

\n

Forklift Cylinders \u2192<\/a><\/h3>\n

Lifting, tilt, steering. HCYY OEM parts.<\/p>\n<\/div>\n<\/div>\n

\n

\"AWV\"<\/p>\n

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AWV Cylinders \u2192<\/a><\/h3>\n

Scissor\/boom lift \u2014 15 types.<\/p>\n<\/div>\n<\/div>\n

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\"All\"<\/p>\n

\n

All Cylinders \u2192<\/a><\/h3>\n

Complete catalogue.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

Product Images \u2014 Reference Gallery<\/h2>\n
\"Double<\/a>
\n\"Telescopic<\/a>
\n\"Multi-stage\"<\/a>
\n\"Factory\"<\/a><\/div>\n<\/section>\n<\/div>","protected":false},"excerpt":{"rendered":"
Double acting telescopic hydraulic cylinder \u2014 hydraulic pressure in both directions: extend AND retract. Where single-acting cylinders rely on gravity to push the stages back in, the double-acting cylinder provides hydraulic force on the retract stroke, giving the operator full control over both the raise and lower movements. Essential for non-vertical mounting, lightweight dump bodies, flatbed tilt mechanisms, and any application where controlled retraction speed matters. Cost effective: the additional engineering (retract-side seals, internal passages, second port) adds cost versus single-acting, but Korea Ever-Power optimises the manufacturing to deliver the double-acting capability at competitive pricing. Custom bore 2\u20136 inch, stroke 4\u2013100 inch. ISO 9001. OEM & ODM.<\/div>","protected":false},"featured_media":2271,"comment_status":"open","ping_status":"closed","template":"","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":""},"product_brand":[],"product_cat":[851],"product_tag":[],"class_list":["post-2289","product","type-product","status-publish","has-post-thumbnail","product_cat-telescopic-hydraulic-cylinder","first","instock","shipping-taxable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/hydrauliccylindersprice.com\/tr\/wp-json\/wp\/v2\/product\/2289","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hydrauliccylindersprice.com\/tr\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/hydrauliccylindersprice.com\/tr\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/tr\/wp-json\/wp\/v2\/comments?post=2289"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/tr\/wp-json\/wp\/v2\/media\/2271"}],"wp:attachment":[{"href":"https:\/\/hydrauliccylindersprice.com\/tr\/wp-json\/wp\/v2\/media?parent=2289"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/tr\/wp-json\/wp\/v2\/product_brand?post=2289"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/tr\/wp-json\/wp\/v2\/product_cat?post=2289"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/tr\/wp-json\/wp\/v2\/product_tag?post=2289"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}