Introduction
Wherever the discharge system of a Feldbinder silo trailer brings together two different Storz coupling sizes, a reducer is used — a transition from one coupling diameter to another. A reducer is just as susceptible to spontaneous disconnection as a standard coupling, and often more so, because it connects components of different mass and geometry. On EUT (non-tipping) and KIP (tilting silo) trailers, these joints operate under working pressure, vibration, and dynamic load during transit.
The Storz reduction clamp is a reinforced safety device — fitted with metal locking lugs, it provides a more secure hold than a conventional rubber-lined band clamp. It is used wherever a more reliable coupling lock is required: on reducers and on couplings operating under demanding conditions. From a Feldbinder service perspective, this component increases the reliability of the entire discharge line — particularly on the EUT, where the whole unloading process is pneumatic and any disconnection stops the cycle.
PHS Magnum in Chorula near Opole holds stock of reinforced safety clamps in two material variants, matched to the type of Storz coupling.
Specification and Materials
Safety clamps for Storz couplings and Storz reducers, in two material variants:
| Variant | Material | Feature |
|---|---|---|
| Economy | Painted steel | Reinforced, metal locking lugs |
| Reinforced | Galvanised steel | Reinforced, metal locking lugs |
Both variants are fitted with metal locking lugs, which provide a more secure grip on the coupling compared to a conventional band clamp. Galvanised steel offers additional corrosion resistance under road conditions.
Sizes and Types
Reduction clamps are selected according to the Storz coupling type, which determines the appropriate band width (mm):
| Storz Coupling Type | Band Width (mm) |
|---|---|
| C (52) + C (52) | 43 |
| B (75) + C (52) | 41.5 |
| B (75) + B (75) | 44 |
| A (110) + B (75) | 42 |
| A (110) + A (110) | 52 |
The range covers the couplings and reducers typically found in Feldbinder silo trailer discharge systems. The correct band width is determined by the coupling and reducer types fitted to the individual trailer.
Compatibility with Feldbinder Silo Trailers (EUT/KIP)
- EUT — secures couplings and reducers on the pneumatic discharge system. The reinforced variant is recommended where joints operate under high cycle intensity.
- KIP — the same Storz couplings and reducers are used during pressure-assisted tipping discharge.
The clamp secures the Storz coupling or reducer itself, so it is selected by coupling type regardless of the Feldbinder trailer model.
Why Choose the Reinforced Variant
A Storz reducer is by definition an asymmetric joint — it connects two different diameters, and therefore two components of different mass and geometry. Under pressure and vibration, such a joint is loaded unevenly and is more prone to loosening than a same-diameter coupling. This is why reducers and couplings operating under more demanding conditions call for a reinforced clamp with metal locking lugs rather than a conventional rubber-lined band clamp.
On Feldbinder silo trailers this translates into a concrete benefit:
- More secure lock — metal locking lugs hold the coupling more rigidly, reducing the risk of spontaneous disconnection of the reducer during unloading.
- Material choice to suit conditions — the economy variant (painted steel) performs well in lighter-duty applications; the reinforced variant (galvanised steel) withstands road salt and moisture more effectively.
When selecting a reduction clamp, the coupling type and appropriate band width determine the fit — ensuring the clamp matches the specific reducer on the trailer.
Common Issues
- Unsecured reducer — the most frequent cause of diameter-transition joints disconnecting under pressure.
- Worn metal lugs — on a heavily used clamp the locking action deteriorates; replace the entire clamp.
- Corrosion of painted band — in the economy variant, the paint finish can be less durable than galvanising; in harsh conditions, choose the galvanised variant.
- Incorrect band width — the clamp does not grip the coupling securely; select according to Storz coupling type.
Availability and Delivery
We hold stock of reinforced safety clamps in Chorula near Opole (4 km from the A4 motorway, approx. 180 km from the DE border). Both variants are generally available off the shelf for the most common coupling sizes.
Courier delivery throughout Poland and the EU; combined orders with other Storz accessories are possible. For selection advice and pricing — ask for a quote.
Related Categories
- Storz Safety Clamps — classic steel-band clamps with rubber lining.
- Storz Hammers and Spanners — spanners for Storz couplings and a rubber mallet for striking the silo.
- Feldbinder EUT Spare Parts — full range of parts for the horizontal EUT silo trailer.
- Feldbinder KIP Spare Parts — hydraulics and seals for the tilting KIP silo.
- See also: spare parts hub, silo trailer service PHS Magnum.
See also: This category in the full PHS Magnum network catalogue (all brands) →
Author: Aleksy Pasternak — Managing Partner PHS Magnum, 20 years in the industry, internal ISO 9001:2015 auditor (DEKRA).
