Producent · Austria · Fertilisation and agronomy

Perwolf

Austrian slurry technology: from suction at the tank, through the pump station and hose line, to sub-surface application — no heavy slurry tanker.

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Slurry straight from the lagoon to the field — no tanker

Filozofia

Austrian slurry technology: from suction at the tank, through the pump station and hose line, to sub-surface application — no heavy slurry tanker.

Perwolf is an Austrian manufacturer of slurry technology (Gülletechnik) with over thirty years of experience. The company does not build mulchers. It builds a complete slurry application chain: from suction at the tank, through the pump station and hose line, to sub-surface application in the field. Hose application (Verschlauchung) is an efficient alternative to spreading with a slurry tanker: transport and empty return runs disappear, and throughput reaches 120 to nearly 200 m³/h. In the field, one tractor works with a front hose reel drum and a rear application system. The set is light, so ground pressure and the risk of compacting the sward are much lower, and short weather windows can be used.

120–200m³/h

Hose application throughput

300m³/h

Max. throughput of the pump station

30%

Lower ammonia losses (trailing-shoe application)

Engineering

What stands behind Perwolf machines

The hose system — how it works

The process starts at the tank: a suction unit draws slurry directly from the tank, instead of hauling it over roads in a slurry tanker. The pump station sets the slurry in motion and keeps a steady flow even over a distance of several kilometres. Height differences and large areas are not a problem. The hose drum unwinds the supply hose automatically while driving and rewinds it efficiently after application, so long sections of hose do not have to be moved by hand. At the end of the line, a tractor works with the application system. Without a heavy tanker, the set is light and manoeuvrable.

Pumps and pump stations — the heart of the system

A hose system is only as strong as its pump. The screw pump (drive power approx. 70–110 kW, throughput up to 120 m³/h) is self-priming, so it works well over long transport distances and large height differences. The centrifugal pump (from approx. 140 kW, up to 300 m³/h) has lower component wear, high throughput and is designed for continuous operation. The Slurry Jet (from approx. 140 kW, up to 300 m³/h) also allows an additional hose reel to be connected. The range also includes a mobile pump station (up to approx. 290 hp). The stations feature, among other things, radio control and flow regulation matched to the required rate, which saves energy and prevents excessive pumping pressure.

Hose line — hoses and couplings

ECO hoses are available in diameters of 65, 76, 90 and 102 mm (burst pressure 50 bar, mass 510–1000 g/m, wall thickness 2.2–2.8 mm). Orange hoses cover diameters of 76, 90, 102, 127 and 152 mm (burst pressure 40–50 bar, mass 1100–2200 g/m). Couplings — Storz, clamp connections or permanent connections — are suited to high pressure and frequent connecting and disconnecting. Individual components make up a closed, leak-proof system with no slurry loss.

Sub-surface application — trailing shoes

The flexible EPTUM trailing shoes are made of EPDM (ethylene propylene diene rubber) and keep their shape thanks to two side spring elements. Underneath, a wear-resistant metal skid works to provide optimal contact with the soil, so unevenness in the ground is almost completely compensated. Slurry goes under the leaves, close to the ground: it does not contaminate the fodder and does not evaporate. The distribution of the stream is controlled by the Harsö cutting head: 40 outlets at 30 cm spacing, central feed, hydraulic width adjustment 19 m, transport height 160 cm.

Why Perwolf

01Hose application throughput of 120 to nearly 200 m³/h — no transport or empty return runs
02Sub-surface application with trailing shoes — up to 30% lower ammonia losses; slurry goes under the leaves, not onto the fodder
03Harsö cutting and distribution head — 40 outlets at 30 cm spacing, hydraulic width adjustment 19 m
04Pump stations up to 300 m³/h: screw pump (70–110 kW, up to 120 m³/h, self-priming), centrifugal pump and Slurry Jet (from approx. 140 kW, up to 300 m³/h)
05A light set instead of a heavy slurry tanker — lower ground pressure, work also on wet soils and in standing crops

Production

Obdach (Styria), Austria

Perwolf is an Austrian manufacturer of slurry technology (Gülletechnik) from Obdach in Styria, operating for over thirty years. The range covers the whole chain: pumps and pump stations (screw pump, centrifugal pump, Slurry Jet, mobile pump station), hose line with ECO and Orange hoses and couplings (Storz, clamp connections, permanent connections), P-series hose reels, sub-surface applicators with trailing shoes (EPTUM with Harsö cutting head), and separators. The philosophy is one: slurry should go straight from the tank into the root zone, without hauling it with a heavy tanker over roads and fields. In Poland, Perwolf machines are distributed by RUTHENIA ALBA.

Machines