{"id":2386,"date":"2026-06-30T08:59:01","date_gmt":"2026-06-30T08:59:01","guid":{"rendered":"https:\/\/hydrauliccylindersprice.com\/product\/filter-press-hydraulic-cylinder\/"},"modified":"2026-06-30T08:59:07","modified_gmt":"2026-06-30T08:59:07","slug":"filter-press-hydraulic-cylinder","status":"publish","type":"product","link":"https:\/\/hydrauliccylindersprice.com\/it\/prodotto\/filter-press-hydraulic-cylinder\/","title":{"rendered":"Filter Press Hydraulic Cylinder"},"content":{"rendered":"

<\/p>\n

<\/p>\n

\n
\n
\n Filter Press Cylinder<\/span>
\n New Application \u2014 Solid-Liquid Separation<\/span>\n <\/div>\n

45 MPa.
The Highest Pressure
in the Range.<\/h2>\n

The forging press master cylinder works at 31.5 MPa. The filter press cylinder works at 45 MPa<\/em> \u2014 43% higher. And it doesn’t forge anything. It squeezes a stack of filter plates together with nearly 12,000 KN of force, holds that force for hours while slurry is pumped through the filter media, then pulls the plates apart so the dried filter cake can be discharged. Different industry. Different duty. Same precision engineering.<\/p>\n

\n
\n
45 MPa<\/div>\n
Working Pressure<\/div>\n<\/div>\n
\n
11,889 KN<\/div>\n
Max Thrust<\/div>\n<\/div>\n
\n
160\u2013580mm<\/span><\/div>\n
Bore Range<\/div>\n<\/div>\n
\n
Push + Pull<\/div>\n
Dual Action<\/div>\n<\/div><\/div>\n<\/p><\/div>\n<\/section>\n

<\/p>\n

\n

What Is a Filter Press \u2014 And Why It Needs 45 MPa<\/h2>\n

A filter press separates solids from liquids. It consists of a stack of 20\u2013200 recessed plates, each lined with filter cloth. The hydraulic cylinder compresses these plates together into a sealed stack. Slurry (a mixture of liquid and fine solids \u2014 mine tailings, wastewater sludge, chemical precipitates, food processing waste) is then pumped into the chambers formed between the plates under high pressure. The liquid passes through the filter cloth and drains away; the solids accumulate in the recesses as a compressed “filter cake.”<\/p>\n

The cylinder must compress the plate stack tightly enough to seal every plate-to-plate junction against the slurry pump pressure (which can reach 16\u201325 bar). Any leak between plates means slurry bypasses the filter media \u2014 contaminating the filtrate and wasting processing capacity. Higher cylinder pressure provides a greater safety margin against leakage, which is why filter press cylinders operate at 45 MPa \u2014 far above the 25\u201331.5 MPa used by forging press cylinders. Korea Ever-Power manufactures filter press cylinders as part of the industrial engineering hydraulic cylinder<\/a> programme.<\/p>\n

\"Filter
\n<\/section>\n

<\/p>\n

\n

Technical Specifications<\/h2>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n
Parameter<\/th>\nValue<\/th>\n<\/tr>\n<\/thead>\n
Product<\/td>\nFilter Press Hydraulic Cylinder<\/td>\n<\/tr>\n
Function<\/td>\nPush plates closed \/ pull plates open<\/td>\n<\/tr>\n
Bore Diameter<\/td>\n160 mm \u2013 580 mm<\/td>\n<\/tr>\n
Rod Diameter<\/td>\n110 mm \u2013 410 mm<\/td>\n<\/tr>\n
Stroke<\/td>\n\u2264 2,600 mm<\/td>\n<\/tr>\n
Maximum Thrust<\/td>\n11,889 KN (bore 580 mm \/ pressure 45 MPa)<\/td>\n<\/tr>\n
Working Pressure<\/td>\nUp to 45 MPa (highest in range)<\/td>\n<\/tr>\n
Certification<\/td>\nISO 9001 \u00b7 100% hydrostatic tested at 67.5 MPa (1.5\u00d7)<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<\/section>\n

<\/p>\n

\n

Push-Pull \u2014 One Cylinder, Two Opposite Jobs<\/h2>\n
\n \"Filter<\/p>\n

The filter press cylinder performs two opposite actions in every filtration cycle \u2014 and both demand full force.<\/p>\n

Push (closing):<\/strong> The cylinder extends, driving the movable head plate along the frame’s side rails toward the fixed head plate. The filter plates between them compress together, sealing every plate-to-plate junction. The cylinder holds this compression at full pressure throughout the entire filtration cycle \u2014 which can last 30 minutes to 4 hours depending on the slurry volume and the cake dryness requirement.<\/p>\n

Pull (opening):<\/strong> After filtration, the cylinder retracts \u2014 pulling the movable head plate back to separate the plate stack. The plates then shift apart one by one (manually, mechanically, or automatically) to discharge the filter cake. The pull force must overcome the residual compression, any plate-to-plate adhesion from dried slurry, and the friction of the head plate on the guide rails.<\/p>\n

This push-pull dual action means the cylinder is double-acting \u2014 unlike the plunger-type side shift cylinders (#11, #12) which are single-acting. The seals must perform equally well in both pressure directions, and the rod must be sized for the pull force (which acts on the rod-side annular area, not the full bore area).<\/p>\n<\/p><\/div>\n

<\/div>\n<\/section>\n

<\/p>\n

\n

Six Industries \u2014 One Cylinder Design<\/h2>\n

The filter press cylinder serves a far broader range of industries than any forging press cylinder. The cylinder hardware is fundamentally the same \u2014 the difference is in the corrosion protection and seal material selected for each industry’s specific slurry chemistry.<\/p>\n

\n
\n Mining and mineral processing<\/strong><\/p>\n

Tailings dewatering, concentrate filtration, acid mine drainage treatment. Slurry is abrasive (fine rock particles) and may be acidic (pH 2\u20134). Cylinder rod requires additional chrome thickness or ceramic coating. Seals must resist acidic contamination.<\/p>\n<\/p><\/div>\n

\n Municipal wastewater treatment<\/strong><\/p>\n

Sludge dewatering before landfill or incineration. Slurry contains organic matter and may have elevated chloride levels. Standard chrome plating and NBR seals are typically adequate. High cycle volume \u2014 some plants filter 10\u201320 batches per day.<\/p>\n<\/p><\/div>\n

\n Chemical and pharmaceutical<\/strong><\/p>\n

Catalyst recovery, pigment filtration, API (active pharmaceutical ingredient) isolation. Slurry may contain aggressive solvents, strong acids, or caustic solutions. Cylinder may require stainless steel barrel and rod, or specialised seal compounds (FFKM\/Kalrez).<\/p>\n<\/p><\/div>\n

\n Food and beverage<\/strong><\/p>\n

Wine, beer, juice, and edible oil clarification. Cylinder must meet food-contact hygiene standards \u2014 stainless steel surfaces, food-grade hydraulic fluid, no external corrosion risk near the product. FDA\/EC compliant seal materials.<\/p>\n<\/p><\/div>\n

\n Ceramics and clay processing<\/strong><\/p>\n

Clay slip dewatering, kaolin processing, glaze waste recovery. Slurry is abrasive (fine mineral particles) but typically pH-neutral. Standard cylinder with heavy-duty wipers to exclude clay particles from the rod seal.<\/p>\n<\/p><\/div>\n

\n Electroplating and surface treatment<\/strong><\/p>\n

Metal hydroxide sludge dewatering, chromium recovery, zinc plating waste filtration. Slurry contains heavy metals and strong acids\/alkalis. Cylinder barrel and rod must resist splash exposure to plating chemicals \u2014 often requires additional surface treatment or protective shrouding.<\/p>\n<\/p><\/div>\n<\/p><\/div>\n<\/section>\n

<\/p>\n

\n
\n

Engineering Challenge \u2014 Hours Under Pressure, Not Seconds<\/h2>\n

A forging press master cylinder holds pressure for seconds \u2014 the dwell at the bottom of the press stroke. The filter press cylinder holds pressure for hours. This difference in hold duration changes every aspect of the hydraulic circuit and seal design.<\/p>\n

\n
\n Pressure maintenance without pump running<\/strong><\/p>\n

Running the hydraulic pump for 2\u20134 hours of continuous filtration is wasteful and generates unnecessary heat. The filter press circuit uses a pilot-operated check valve to lock the cylinder at compression pressure, then shuts the pump off. The cylinder holds pressure through the check valve alone \u2014 with zero leakage tolerance. Any internal seal leak during the hold period causes gradual pressure loss, which loosens the plate stack and allows slurry leakage between plates.<\/p>\n<\/p><\/div>\n

\n Seal creep at sustained high pressure<\/strong><\/p>\n

At 45 MPa sustained for hours, elastomer seals undergo creep \u2014 gradual extrusion into the seal gap under continuous pressure. Standard NBR seals used on forging press cylinders (which hold pressure for seconds) may creep excessively at 45 MPa sustained duty. Korea Ever-Power specifies high-modulus polyurethane or PTFE-bronze composite seals for filter press cylinders \u2014 materials that resist creep under sustained high pressure without losing their sealing effectiveness.<\/p>\n<\/p><\/div>\n

\n Thermal cycling from slurry contact<\/strong><\/p>\n

Some filtration processes use heated slurry (60\u201390 \u00b0C) to improve flow through the filter media. The cylinder, mounted on the filter press frame, absorbs heat from the hot plates through the frame structure. Over each filtration cycle, the cylinder heats up during filtration and cools down during cake discharge \u2014 thermal cycling that stresses the seals and can cause condensation inside the barrel if the cooling is rapid.<\/p>\n<\/p><\/div>\n<\/p><\/div>\n

Korea Ever-Power designs every filter press cylinder for sustained-pressure duty \u2014 with creep-resistant seals, zero-leak check valve provisions, and thermal-cycling tolerance. Contact the hydraulic cylinder engineering team<\/a> for filter press cylinder specifications.<\/p>\n<\/p><\/div>\n<\/section>\n

<\/p>\n

\n \"Filter
\n<\/section>\n

<\/p>\n

\n

Manufacturing for 45 MPa Sustained Service<\/h2>\n
\n \"Korea<\/p>\n

The 45 MPa working pressure demands heavier barrel wall thickness than any forging press cylinder of the same bore diameter. At 580 mm bore and 45 MPa, the barrel wall must withstand sustained hoop stress without creep or fatigue \u2014 the same 45 MPa acts on the barrel 24 hours a day, 7 days a week on continuous-operation filter press installations. Korea Ever-Power calculates the barrel wall thickness to ASME or EN standards for sustained-pressure vessels, not the simpler static-pressure calculation used for intermittent-duty press cylinders.<\/p>\n

The bore is honed to Ra 0.2\u20130.4 \u00b5m \u2014 the same finish standard as all Korea Ever-Power press cylinders. The rod is chrome plated with additional thickness (50\u201380 \u00b5m) for corrosion resistance in the wet filter press environment. For chemical and mining applications, nickel-chrome or ceramic rod coatings are available as alternatives to standard hard chrome.<\/p>\n

Every filter press cylinder is hydrostatic tested at 1.5\u00d7 working pressure \u2014 67.5 MPa \u2014 with a sustained hold test to verify zero pressure drop over a defined period. This hold test simulates the actual operating condition: hours at full pressure with the pump off. If the cylinder leaks even slightly during the hold test, it fails \u2014 the seals are replaced and the test is repeated before shipment.<\/p>\n<\/p><\/div>\n

<\/div>\n<\/section>\n

<\/p>\n

\n

OEM & ODM<\/h2>\n
\n
\n
\n

What You Provide<\/h3>\n<\/div>\n
\n

Filter press size (number of plates, plate dimensions), required closing force, stroke (plate stack thickness range \u2014 minimum plates to maximum plates), slurry chemistry (pH, abrasive content, temperature), filtration cycle time (hold duration), operating environment (indoor\/outdoor, ambient temperature range), and the filter press frame drawing showing the cylinder mounting position and guide rail arrangement.<\/p>\n<\/div><\/div>\n

\n
\n

What the Factory Delivers<\/h3>\n<\/div>\n
\n

Engineering drawing with bore, rod, stroke, barrel wall thickness (calculated for sustained 45 MPa), seal specification (selected for slurry chemistry and hold duration), rod coating specification, and check-valve mounting provisions. 100% hydrostatic test at 67.5 MPa with sustained hold verification. Seal kits for scheduled maintenance. Browse all industrial engineering hydraulic cylinders<\/a>.<\/p>\n<\/div><\/div>\n<\/p><\/div>\n<\/section>\n

<\/p>\n

\n

FAQ<\/h2>\n
\n
\n

How does filter press cylinder duty differ from forging press cylinder duty?<\/h3>\n

Forging press cylinders cycle rapidly (seconds per stroke) at high force (up to 80 MN) and hold pressure briefly (seconds). Filter press cylinders cycle slowly (1\u20138 cycles per day), generate moderate force (up to ~12 MN), but hold pressure continuously for hours. The filter press cylinder’s primary engineering challenge is sustained-pressure seal integrity; the forging press cylinder’s primary challenge is high-cycle fatigue and shock resistance. They are different engineering problems that require different cylinder designs, even though both come from the same manufacturing facility<\/a>.<\/p>\n<\/p><\/div>\n

\n

Can the cylinder accommodate different numbers of filter plates?<\/h3>\n

Yes \u2014 the stroke is designed to cover the range from the minimum number of plates (thin stack, cylinder nearly fully extended) to the maximum number (thick stack, cylinder near mid-stroke). This allows the filter press operator to add or remove plates as production requirements change without replacing the cylinder. The 2,600 mm maximum stroke provides generous accommodation for plate count variation.<\/p>\n<\/p><\/div>\n

\n

Is the cylinder exposed to the slurry directly?<\/h3>\n

Not directly \u2014 the cylinder is mounted on the filter press frame outside the plate stack. However, splash, drip, and aerosol from the slurry during cake discharge can contact the cylinder barrel and rod. In aggressive chemical environments, a protective shroud or bellows boot is fitted over the rod to prevent chemical contact with the chrome surface and seals. Korea Ever-Power designs the rod end with shroud mounting provisions as standard for chemical and mining applications. The same corrosion protection approach applies to outdoor-service forklift cylinders<\/a> and marine telescopic cylinders<\/a>. Browse the full hydraulic cylinder product range<\/a>.<\/p>\n<\/p><\/div>\n<\/p><\/div>\n<\/section>\n

<\/p>\n

\n

Related Categories<\/h2>\n
\n <\/p>\n
\n
\"Telescopic\"<\/div>\n
\n
Telescopic Hydraulic Cylinders \u2192<\/div>\n
Dump truck, trailer, hoist.<\/div>\n<\/div>\n<\/div>\n

<\/a>
\n <\/p>\n

\n
\"Forklift\"<\/div>\n
\n
Forklift Hydraulic Cylinders \u2192<\/div>\n
Lift, tilt, steer \u2014 OEM.<\/div>\n<\/div>\n<\/div>\n

<\/a>
\n <\/p>\n

\n
\"AWV\"<\/div>\n
\n
Aerial Work Vehicle Cylinders \u2192<\/div>\n
Scissor, boom, platforms.<\/div>\n<\/div>\n<\/div>\n

<\/a>\n <\/div>\n<\/section>\n

<\/main><\/p>","protected":false},"excerpt":{"rendered":"

Filter press hydraulic cylinder \u2014 the drive actuator that compresses the filter plate stack and then opens it for cake discharge. This is a different world from forging presses: the cylinder operates at 45 MPa (the highest working pressure in the Korea Ever-Power range), holds full compression for hours while slurry is pumped through the plates, and must resist corrosive environments ranging from mine tailings to chemical processing effluent. Bore 160\u2013580 mm, rod 110\u2013410 mm, stroke \u22642,600 mm, thrust up to 11,889 KN. Push-pull dual action: pushes the plate stack closed for filtration, pulls it open for cake discharge. Korea Ever-Power. ISO 9001. OEM & ODM.<\/div>","protected":false},"featured_media":2387,"comment_status":"closed","ping_status":"open","template":"","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":""},"product_brand":[],"product_cat":[852],"product_tag":[],"class_list":["post-2386","product","type-product","status-publish","has-post-thumbnail","product_cat-industrial-engineering-hydraulic-cylinders","pa_editor-cxm","first","instock","product-type-simple"],"_links":{"self":[{"href":"https:\/\/hydrauliccylindersprice.com\/it\/wp-json\/wp\/v2\/product\/2386","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hydrauliccylindersprice.com\/it\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/hydrauliccylindersprice.com\/it\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/it\/wp-json\/wp\/v2\/comments?post=2386"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/it\/wp-json\/wp\/v2\/media\/2387"}],"wp:attachment":[{"href":"https:\/\/hydrauliccylindersprice.com\/it\/wp-json\/wp\/v2\/media?parent=2386"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/it\/wp-json\/wp\/v2\/product_brand?post=2386"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/it\/wp-json\/wp\/v2\/product_cat?post=2386"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/it\/wp-json\/wp\/v2\/product_tag?post=2386"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}