{"id":2313,"date":"2026-06-29T07:32:47","date_gmt":"2026-06-29T07:32:47","guid":{"rendered":"https:\/\/hydrauliccylindersprice.com\/?post_type=product&p=2313"},"modified":"2026-06-29T07:32:47","modified_gmt":"2026-06-29T07:32:47","slug":"factory-customized-2-stage-hydraulic-cylinder-small-dump-truck-multistage","status":"publish","type":"product","link":"https:\/\/hydrauliccylindersprice.com\/sr\/%d0%bf%d1%80%d0%be%d0%b8%d0%b7%d0%b2%d0%be%d0%b4\/factory-customized-2-stage-hydraulic-cylinder-small-dump-truck-multistage\/","title":{"rendered":"Factory Customized 2 Stage Hydraulic Cylinder \u2014 Small Dump Truck Multistage"},"content":{"rendered":"
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VALVE & PRESSURE RELIEF GUIDE<\/span>
\n2-STAGE \u00b7 SMALL TRUCK<\/span><\/div>\n

Customized 2 Stage
\nSmall Dump Truck
\nValves That Protect the Cylinder & Control the Body<\/span><\/h2>\n

A telescopic hydraulic cylinder<\/a> does not operate alone \u2014 it works within a hydraulic circuit that includes a pump, a directional valve, and critically, safety and control valves that protect the cylinder from damage and prevent dangerous uncontrolled movement of the dump body.<\/p>\n<\/div>\n

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3 Valves<\/div>\n
Protection System<\/div>\n<\/div>\n
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2 Stage<\/div>\n
Small Truck<\/div>\n<\/div>\n
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2\u20136\u2033<\/div>\n
Bore<\/div>\n<\/div>\n
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4\u2013100\u2033<\/div>\n
Stroke<\/div>\n<\/div>\n<\/div>\n
Pressure Relief<\/span>
\nLoad Holding<\/span>
\nFlow Control<\/span><\/div>\n
<\/div>\n
\"Small<\/div>\n<\/div>\n<\/div>\n

Small dump trucks are particularly sensitive to valve selection because their hydraulic systems operate at lower flow rates (smaller pumps) and their dump bodies are lighter \u2014 meaning the load-holding and speed control requirements differ from larger vehicles. Understanding these three valve types helps you specify the complete hydraulic system that works correctly with the Korea Ever-Power telescopic cylinder \u2014 not just the cylinder in isolation.<\/p>\n<\/section>\n

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Customized 2 Stage Small Dump Truck \u2014 Parameters<\/h2>\n
\n\n\n\n\n\n\n\n
Bore \/ Rod \/ Stroke \/ Pin<\/td>\n2\u20136\u2033 \/ 1.125\u20134\u2033 \/ 4\u2013100\u2033 \/ 0.5\u20132\u2033<\/td>\n<\/tr>\n
Port Options<\/td>\nG \/ SAE \/ NPT \/ M<\/td>\n<\/tr>\n
Valve Compatibility<\/td>\nCompatible with all standard relief, load-hold, and flow control valves<\/td>\n<\/tr>\n
Body \/ Certification<\/td>\nSteel \/ ISO 9001 \/ 100% pressure tested<\/td>\n<\/tr>\n
Lead Time \/ Warranty<\/td>\n25\u201335 days \/ 1 year<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/section>\n

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\"2<\/section>\n

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Three Valve Types \u2014 Function, Failure, and Correct Sizing<\/h2>\n
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1. Pressure Relief Valve \u2014 Protecting the Cylinder from Over-Pressure<\/h3>\n<\/div>\n
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The pressure relief valve (PRV) limits the maximum system pressure to protect the pump, hoses, fittings, and cylinder from exceeding their rated pressure. It opens when the system pressure reaches the set point, diverting excess flow back to the reservoir. Without a PRV, a stalled cylinder (e.g. dump body hits a mechanical stop at full tip) would see pressure rise until the weakest component fails \u2014 typically a hose fitting blows, a seal extrudes, or in extreme cases the barrel yields.<\/p>\n

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Correct setting:<\/strong><\/p>\n

Set the PRV 10\u201315% above the maximum expected working pressure of the cylinder \u2014 high enough that it doesn’t open during normal operation, low enough that it opens before any component is damaged. For a cylinder rated at 200 bar, set the PRV at 220\u2013230 bar. Never set the PRV higher than the cylinder’s rated pressure.<\/p>\n<\/div>\n

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What fails when the PRV is wrong:<\/strong><\/p>\n

PRV set too high \u2192 cylinder exceeds rated pressure \u2192 seal extrusion, hose failure, or barrel deformation. PRV set too low \u2192 opens during normal tipping \u2192 reduced tipping force, cylinder cannot fully tip a loaded body. PRV stuck open \u2192 no pressure build-up \u2192 cylinder does not extend at all.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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2. Load-Holding Valve \u2014 Preventing Body Drift<\/h3>\n<\/div>\n
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The load-holding valve (also called a pilot-operated check valve or counterbalance valve) prevents the dump body from lowering under its own weight when the directional valve is in neutral. Without a load-holding valve, a single-acting telescopic cylinder would slowly retract under the weight of the dump body \u2014 causing the body to drift downward while workers are standing near or under it. This is a critical safety function.<\/p>\n

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How it works:<\/strong><\/p>\n

The valve blocks flow from the cylinder port when the directional valve is in neutral \u2014 preventing gravity-driven retraction. When the operator activates the “lower” function, pilot pressure from the directional valve opens the load-holding valve, allowing controlled retraction at the speed set by the flow control valve.<\/p>\n<\/div>\n

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What fails when missing or faulty:<\/strong><\/p>\n

Missing \u2192 dump body drifts down under gravity (safety hazard). Leaking \u2192 slow creep downward over minutes\/hours (body drops overnight). Stuck closed \u2192 body will not lower when commanded. Regular inspection of the load-holding valve is a safety maintenance item \u2014 not optional.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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3. Flow Control Valve \u2014 Regulating Tipping and Lowering Speed<\/h3>\n<\/div>\n
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The flow control valve regulates the volumetric flow rate to and from the cylinder \u2014 controlling the speed of extension (tipping) and retraction (lowering). Too fast and the dump body slams up or down dangerously; too slow and the tipping cycle wastes time. For small dump trucks, the lowering speed is particularly important \u2014 a light aluminium body with gravity-assisted retraction can lower very quickly without flow control, creating a safety risk.<\/p>\n

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Extension speed:<\/strong><\/p>\n

Controlled by pump flow rate and cylinder bore area. Extension speed (mm\/s) = pump flow (cm\u00b3\/s) \u00f7 piston area (cm\u00b2). For a 3-inch bore 2-stage cylinder with a 15 L\/min pump: ~55 mm\/s extension speed. Adjust pump RPM or add a flow control valve to fine-tune.<\/p>\n<\/div>\n

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Lowering speed:<\/strong><\/p>\n

Must be controlled independently of extension speed \u2014 a restrictor or flow control valve on the return line prevents uncontrolled gravity-driven lowering. For small dump trucks with light bodies, this lowering speed control is a safety requirement, not an optional refinement.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n

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Common Valve Misconfigurations on Small Dump Trucks<\/h2>\n
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No load-holding valve on single-acting systems<\/strong><\/p>\n

The most dangerous misconfiguration. Some budget small dump truck conversions omit the load-holding valve to save cost \u2014 relying only on the directional valve spool to prevent body drift. Directional valve spools leak internally over time \u2014 the body slowly drifts down. This is a workplace safety issue. Always install a dedicated load-holding valve on single-acting telescopic cylinders.<\/p>\n<\/div>\n

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PRV set to pump maximum instead of cylinder rating<\/strong><\/p>\n

Some installers set the PRV to the pump’s maximum pressure rating rather than the cylinder’s rated working pressure. If the pump is rated at 250 bar but the cylinder is rated at 200 bar, a 250-bar PRV setting exposes the cylinder to 25% over-pressure on every stall condition. Always set the PRV based on the cylinder’s working pressure \u2014 not the pump’s capability.<\/p>\n<\/div>\n

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No lowering speed control on light bodies<\/strong><\/p>\n

Small dump trucks with aluminium bodies or empty steel bodies retract very quickly under gravity \u2014 the body drops with minimal resistance. Without a flow control restrictor on the return line, the lowering speed is uncontrolled and potentially dangerous. Install a needle valve or flow control on the return line to limit the lowering speed to a safe, controlled rate. This is especially important on 12V DC systems where the control valve may not include built-in flow regulation.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

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OEM & ODM \u2014 Cylinder + Valve System Integration<\/h2>\n
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What You Provide<\/h3>\n<\/div>\n
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Bore, rod, stroke, 2-stage, mounting, ports, working pressure \u2014 plus system information: pump type (PTO or DC electric), pump flow rate (L\/min), system maximum pressure, and whether you need the cylinder only or the cylinder with an integrated valve block (directional + relief + load-hold + flow control in a single manifold). Integrated valve blocks simplify installation for small dump truck body builders.<\/p>\n<\/div>\n<\/div>\n

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What the Factory Delivers<\/h3>\n<\/div>\n
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Drawing with valve integration points confirmed. Cylinder with port positions matched to your valve block layout. Samples available. Production 25\u201335 days. 100% pressure test. 1-year warranty. Contact the hydraulic cylinder factory<\/a> for system integration advice and quotation.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n

\"hydraulic-cylinder-workshop-7\"
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Valve & Pressure Relief \u2014 FAQ<\/h2>\n
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Does the cylinder come with valves included?<\/h3>\n

Standard orders include the cylinder only \u2014 valves are separate components selected and installed by the body builder or hydraulic system integrator. However, Korea Ever-Power can supply the cylinder with an integrated valve block (directional + relief + load-hold + flow control) as a complete hoist kit for OEM body builders who prefer a pre-configured system. Specify “hoist kit with valve block” in your inquiry if you want the integrated option.<\/p>\n<\/div>\n

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My dump body drifts down slowly when parked \u2014 is the cylinder leaking?<\/h3>\n

Usually no \u2014 the cylinder is not the first suspect. Body drift is most commonly caused by a leaking load-holding valve (pilot-operated check valve) or internal leakage past the directional valve spool. Check the load-holding valve first \u2014 replace the O-rings or the entire valve if it is leaking past. If the load-holding valve is good, check the directional valve for internal spool leakage. Only if both valves are confirmed good should the cylinder’s internal seals be suspected. The same diagnostic approach applies to all telescopic cylinders<\/a>, forklift cylinders<\/a>, and aerial platform cylinders<\/a>.<\/p>\n<\/div>\n

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How do I calculate the correct PRV setting for my cylinder?<\/h3>\n

PRV setting = cylinder rated working pressure \u00d7 1.10 to 1.15 (10\u201315% above working pressure). Example: cylinder rated at 180 bar \u2192 PRV set at 198\u2013207 bar. Never exceed the cylinder’s maximum rated pressure on the PRV setting. If your pump can produce 250 bar but your cylinder is rated at 180 bar, the PRV must be set below 207 bar \u2014 the pump capability is irrelevant to the PRV setting. The cylinder rating is the ceiling.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

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Field Reports<\/h2>\n
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D<\/div>\n
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Dave R. \u2014 Small Tipper Body Builder<\/div>\n
Verified Purchase \u00b7 UK \u00b7 May 2025<\/div>\n<\/div>\n
\u2605\u2605\u2605\u2605\u2605<\/div>\n<\/div>\n

We build 3.5-tonne tippers with aluminium bodies and 12V DC power units. Previously omitted the load-holding valve to save \u00a340 per truck \u2014 until one body drifted down overnight and damaged the tailgate mechanism. Now every truck gets a pilot-operated check valve. The Ever-Power 2-stage cylinder with the valve block option made installation much simpler \u2014 the directional valve, PRV, load-hold valve, and flow control are all in one manifold that bolts directly to the cylinder port. One hose to the pump, one hose to the reservoir \u2014 clean, safe, and fast to install.<\/p>\n<\/div>\n

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V<\/div>\n
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Victor S. \u2014 Fleet Maintenance Technician<\/div>\n
Verified Purchase \u00b7 March 2025<\/div>\n<\/div>\n
\u2605\u2605\u2605\u2605\u2606<\/div>\n<\/div>\n

Called in to diagnose a “leaking cylinder” on a small dump truck \u2014 the body was drifting down over 2 hours. Four stars for this page’s FAQ section which helped me diagnose: the cylinder seals were fine \u2014 the load-holding valve had a worn O-ring allowing slow bypass. Replaced the O-ring ($3 part) and the drift stopped completely. Without the diagnostic guidance on this page, I would have pulled and resealed the cylinder unnecessarily \u2014 a 4-hour job instead of a 30-minute valve O-ring replacement. The lesson: check the valves before blaming the cylinder.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

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Other Hydraulic Cylinder Categories<\/h2>\n
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\"Forklift\"<\/p>\n

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Forklift Cylinder Catalogue \u2192<\/a><\/h3>\n

Load-hold valves essential for mast safety.<\/p>\n<\/div>\n<\/div>\n

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

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AWV Cylinder Safety Systems \u2192<\/a><\/h3>\n

Counterbalance valves for platform safety.<\/p>\n<\/div>\n<\/div>\n

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

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Hydraulic Cylinder System Solutions \u2192<\/a><\/h3>\n

Cylinders + valve integration \u2014 factory direct.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n<\/div>","protected":false},"excerpt":{"rendered":"

Customized 2 stage small dump truck telescopic hydraulic cylinder \u2014 with a guide to the hydraulic valves that protect the cylinder and control the dump body. Three valve types work together with the telescopic cylinder: the pressure relief valve (prevents over-pressurisation that can burst the cylinder), the load-holding valve (prevents the dump body from drifting down under its own weight), and the flow control valve (regulates tipping and lowering speed). This page explains each valve’s function, how it interacts with the cylinder, and what happens when it fails.<\/div>","protected":false},"featured_media":2273,"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-2313","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\/sr\/wp-json\/wp\/v2\/product\/2313","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hydrauliccylindersprice.com\/sr\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/hydrauliccylindersprice.com\/sr\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/sr\/wp-json\/wp\/v2\/comments?post=2313"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/sr\/wp-json\/wp\/v2\/media\/2273"}],"wp:attachment":[{"href":"https:\/\/hydrauliccylindersprice.com\/sr\/wp-json\/wp\/v2\/media?parent=2313"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/sr\/wp-json\/wp\/v2\/product_brand?post=2313"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/sr\/wp-json\/wp\/v2\/product_cat?post=2313"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/sr\/wp-json\/wp\/v2\/product_tag?post=2313"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}