{"id":3090,"date":"2025-12-17T15:18:45","date_gmt":"2025-12-17T15:18:45","guid":{"rendered":"https:\/\/lowayequipment.com\/?page_id=3090"},"modified":"2026-09-30T05:43:46","modified_gmt":"2026-09-30T05:43:46","slug":"high-pressure-belt-filter-press","status":"publish","type":"page","link":"https:\/\/lowayequipment.com\/ms\/high-pressure-belt-filter-press\/","title":{"rendered":"High-Pressure Belt Filter Press"},"content":{"rendered":"\t\t
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\n LW-H and LW-HT series<\/span>\n

High-Pressure Belt Filter Press — Continuous Dewatering to a Low-Moisture Cake<\/h1>\n

A belt filter press that keeps squeezing after the wedge zone. A train of decreasing-diameter rollers, higher belt tension and a wrap angle that shears the cake take out the water a standard press leaves behind. Thickened feed leaves the LW-H at 40% dry solids or better; the integrated LW-HT takes dilute feed straight through to 30% dry solids or better.<\/p>\n

\n Request a technical proposal<\/a>\n See the LW-HT integrated build<\/a>\n <\/div>\n <\/div>\n
\n \"Loway\n <\/div>\n <\/div>\n <\/div>\n<\/section>\n
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The roller train, stage by stage<\/h2>\n

Two belts, one cake. Belt wrap tightens and contact pressure climbs from left to right until the cake leaves the narrowest gap in the machine.<\/p>\n <\/div>\n \n \n \n <\/stop>\n <\/stop>\n <\/linearGradient>\n <\/defs>\n <\/path>\n <\/path>\n <\/circle>\n <\/circle>\n <\/circle>\n <\/circle>\n <\/circle>\n <\/circle>\n <\/rect>\n <\/svg>\n

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\n 01<\/span>\n

Feed and conditioning<\/h3>\n

Polymer flocculates the solids so water can leave mechanically. LW-H feed arrives already thickened; the LW-HT thickens it in the machine.<\/p>\n <\/div>\n

\n 02<\/span>\n

Gravity and wedge<\/h3>\n

Free water drains off the belt before the two belts converge and press gently. The wedge is kept long so the flocs stay intact.<\/p>\n <\/div>\n

\n 03<\/span>\n

Medium pressure<\/h3>\n

Large rollers consolidate the cake without sealing its surface. What leaves this zone is strong enough to take real pressure.<\/p>\n <\/div>\n

\n 04<\/span>\n

High-pressure shear<\/h3>\n

Each roller is smaller than the last, so the wrap tightens and pressure steps up. The changing wrap angle shears the cake and re-opens drainage channels.<\/p>\n <\/div>\n

\n 05<\/span>\n

Discharge and wash<\/h3>\n

The scraper cuts the cake off at the discharge roll. Both belts pass through high-pressure wash showers before the next circuit.<\/p>\n <\/div>\n <\/div>\n <\/div>\n<\/section>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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\n Why high pressure<\/span>\n

The Last Points of Moisture Are the Ones You Pay For<\/h2>\n
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Drying, incineration, tipping and trucking are priced by weight, or by the water that has to be evaporated out of it. Every point of moisture still in the cake is cost carried further down the line, so the value of a high-pressure belt filter press is not on the machine at all — it is in what the cake costs to handle after it.<\/p>\n

A standard belt press finishes in the mid-to-high seventies. The LW-H holds pressure on the cake for longer and discharges at 40% dry solids or better — 60% moisture or less. On the integrated LW-HT, which takes dilute feed straight from the works, the figure is 30% dry solids or better.<\/p>\n

How far a given sludge gets into that band is a conditioning question, not a specification upgrade, and it is fixed with your sludge on a jar test and a bench press run before any machine is quoted.<\/p>\n <\/div>\n

\n \"Dewatered\n

Cake moisture after dewatering<\/p>\n

\n Standard belt filter press<\/b>75–82%<\/span><\/span>\n <\/i><\/span>\n <\/div>\n
\n LW-HT, on dilute feed<\/b>70% or less<\/span><\/span>\n <\/i><\/span>\n <\/div>\n
\n LW-H, on thickened feed<\/b>60% or less<\/span><\/span>\n <\/i><\/span>\n <\/div>\n

Cake moisture, factory figures for dewatering duty: the LW-HT takes feed at 97–99% moisture, the LW-H thickened feed at 80–85%. Your number is measured, not assumed.<\/p>\n <\/div>\n <\/div>\n <\/div>\n<\/section>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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\n The mechanism<\/span>\n

Three Things Turn Belt Wrap Into Pressure<\/h2>\n

The front half of a high-pressure belt filter press is ordinary practice: condition, drain, wedge. Everything that makes the cake drier happens after the wedge, and it comes down to three variables the build controls directly.<\/p>\n

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Roller diameter cascade<\/h3>\n

Each roller after the wedge is smaller than the one before it. A smaller roller means the belt wraps it more tightly, so contact pressure rises in steps instead of arriving in one hard nip. The diameter sequence is set by the duty, not by the frame size.<\/p>\n <\/div>\n <\/article>\n

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Belt tension<\/h3>\n

The LW-H runs higher belt tension than a standard press, so the frame, the bearing blocks and the tension system are all sized for it. Tension is held by pneumatic or hydraulic cylinders and corrected automatically as the belt tracks on the rollers.<\/p>\n <\/div>\n <\/article>\n

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Wrap-angle shear<\/h3>\n

As the wrap angle changes from roller to roller, the cake is sheared across its own surface. That re-opens drainage channels and lets water out of the middle of the cake, not only off the face that touches the belt. It is the part of high pressure sludge dewatering that a single hard nip does not reproduce.<\/p>\n <\/div>\n <\/article>\n <\/div>\n

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\n \"Skid-mounted\n
Skid-mounted LW-H: press, drive, wash circuit and control panel on one base, tested before it leaves.<\/figcaption>\n <\/figure>\n
\n \"Loway\n
Final inspection in the Loway assembly bay before dispatch.<\/figcaption>\n <\/figure>\n <\/div>\n <\/div>\n<\/section>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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\n Series 1 · LW-H<\/span>\n

LW-H Specifications — High-Pressure Belt Filter Press for Thickened Feed<\/h2>\n

The code is LW plus belt width plus H, so an LW-1500H is a 1500 mm high-pressure press. The LW-H is specified where a gravity belt thickener, a decanter or a settling step already delivers feed at 80–85% moisture — the range where the high-pressure zone is doing work on cake rather than on water.<\/p>\n

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Model<\/th>Belt width<\/th>Feed moisture<\/th>Capacity<\/th>Main motor<\/th>System power (approx.)<\/th>Belt speed<\/th>Dimensions L×W×H<\/th><\/tr>\n <\/thead>\n
LW-1000H<\/span><\/td>1000 mm<\/td>80–85%<\/td>1–2 t\/h<\/td>3 kW<\/td>20 kW<\/td>1–12 m\/min<\/td>6.0 × 1.95 × 1.7 m<\/td><\/tr>\n
LW-1500H<\/span><\/td>1500 mm<\/td>80–85%<\/td>2–3 t\/h<\/td>4 kW<\/td>25 kW<\/td>1–12 m\/min<\/td>6.0 × 2.45 × 1.7 m<\/td><\/tr>\n
LW-2000H<\/span><\/td>2000 mm<\/td>80–85%<\/td>3–4 t\/h<\/td>5.5 kW<\/td>30 kW<\/td>1–12 m\/min<\/td>6.0 × 2.95 × 1.7 m<\/td><\/tr>\n <\/tbody>\n <\/table>\n <\/div>\n
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Capacity<\/strong> is the factory figure for dewatering duty at the stated feed. Final selection comes from a sludge test<\/a>: feed solids, conditioning response and the target cake dryness decide belt width, roller train and belt speed together.<\/p>\n

Scope<\/strong> covers the drive, tension and tracking system, wash circuit and control panel. Structural steel, enclosure level, roller covers and wetted-part materials are selected per project; stainless contact parts are available on request.<\/p>\n <\/div>\n <\/div>\n<\/section>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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\n Series 2 · LW-HT<\/span>\n

LW-HT — Thickening and High-Pressure Pressing on One Frame<\/h2>\n

The integrated build exists for the plant that has no thickener in front of the press, or no floor left for one. Dilute sludge goes into the machine at 97–99% moisture and leaves as press cake, with no transfer pump and no second piece of equipment to level and pipe.<\/p>\n

\n \n <\/path>\n <\/path>\n PRE-DEWATERING DECK<\/text>\n HIGH-PRESSURE DECK<\/text>\n <\/rect>\n <\/rect>\n <\/rect>\n <\/rect>\n <\/path>\n <\/path>\n <\/path>\n Feed 97–99%<\/text>\n straight from the works<\/text>\n Pre-dewater to ~80%<\/text>\n belt or screw type<\/text>\n Inline conditioning<\/text>\n polymer into the feed<\/text>\n Cake 30% DS or better<\/text>\n via gravity, wedge, shear<\/text>\n <\/path>\n <\/path>\n One frame, one drive panel, one walkway, one acceptance test.<\/text>\n <\/svg>\n <\/div>\n
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\n 01<\/span>\n

Pre-dewatering<\/h3>\n

Raw sludge enters the upper deck and leaves it at about 80% moisture — the feed the high-pressure deck wants. The module is belt type or screw type, chosen to match the sludge and the space available.<\/p>\n <\/div>\n

\n 02<\/span>\n

Inline conditioning<\/h3>\n

Polymer, and conditioning aids where the duty calls for them, are blended into the pre-dewatered sludge in the mixing zone immediately before the press belts. There is no intermediate tank and no transfer pump.<\/p>\n <\/div>\n

\n 03<\/span>\n

High-pressure dewatering<\/h3>\n

The conditioned sludge runs through gravity, wedge and high-pressure shear zones exactly as on the LW-H. Cake leaves the LW-HT at 30% dry solids or better, which is 70% moisture or less.<\/p>\n <\/div>\n <\/div>\n

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Model<\/th>Belt width<\/th>Feed moisture<\/th>Capacity<\/th>Main motor<\/th>System power (approx.)<\/th>Belt speed<\/th>Dimensions L×W×H<\/th><\/tr>\n <\/thead>\n
LW-1000HT<\/span><\/td>1000 mm<\/td>97–99%<\/td>10–15 m³\/h<\/td>9.7 kW<\/td>35 kW<\/td>1–12 m\/min<\/td>8.0 × 1.95 × 3.5 m<\/td><\/tr>\n
LW-1500HT<\/span><\/td>1500 mm<\/td>97–99%<\/td>15–20 m³\/h<\/td>12.2 kW<\/td>40 kW<\/td>1–12 m\/min<\/td>8.0 × 2.45 × 3.5 m<\/td><\/tr>\n
LW-2000HT<\/span><\/td>2000 mm<\/td>97–99%<\/td>20–30 m³\/h<\/td>15.7 kW<\/td>45 kW<\/td>1–12 m\/min<\/td>8.0 × 2.95 × 3.5 m<\/td><\/tr>\n <\/tbody>\n <\/table>\n <\/div>\n

The two-deck frame stands 3.5 m high: pre-dewatering above, pressing below. The LW-HT sheet gives capacity in m³\/h of raw sludge and the LW-H sheet in t\/h of cake — different duties, different units, both confirmed against your own sludge test. Dimensions are the standard build; layouts are adapted to the site.<\/p>\n <\/div>\n<\/section>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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\n Configured to the project<\/span>\n

One Roller Train, Configured to the Duty<\/h2>\n

Every high-pressure belt filter press we build starts from the same roller train; what changes is everything configured around it. Two plants with the same flow can need different machines, so the build is fixed by your sludge and your site, not by a catalogue row.<\/p>\n

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\n What we configure<\/span>\n

The machine around the duty<\/h3>\n