Storz System

Storz System in Spitzer SF/SK Silo Trailers

The Storz coupling system is the industry-standard quick-connect solution for suction and pressure lines on Spitzer aluminium silo trailers. On SF and SK series trailers it covers the entire pneumatic circuit — from the compressor coupling through transfer hoses to the discharge manifold. The bayonet-style Storz fitting lets an operator connect or disconnect a line with a single quarter-turn and no tools, which matters operationally when handling 200 tonnes of bulk material per day.

Our range covers the complete Storz system tailored to Spitzer silo trailer fleets: couplings (fittings) with internal or external thread in fixed and swivel versions, suction connectors for GBS clamp or shell clamp hose mounting, blanking caps, reducers, and a full selection of seals. This allows a Spitzer SF/SK technician to source an entire coupling assembly from a single supplier, removing the risk of mismatched lug spacing or incompatible seal materials.

The backbone of the range is Polish aluminium — AK 11 (AlSi 11) casting to PN-91/M-51031 — proven in daily service on trailers carrying PE/PP granulate and other bulk materials. Where higher corrosion resistance or food-grade contact is required, we specify German aluminium, brass, or stainless steel with the appropriate seals. Every item is interchangeable with the factory-fitted Storz standard on Spitzer trailers, making the parts equally suitable for routine repairs and full refurbishment of older SF/SK units.

Specifications and Materials

Couplings, Caps and Reducers — Versions Available

Suction Connectors — Hose Mounting Methods

Suction connectors are also available in German aluminium (to standards 14301, 14322, 14323) with white NBR seal, with a steel hose tail, and in stainless steel size B(75) to standard 14307 with a green Viton seal.

Sizes and Types

Storz Seals — Size and Material Range

Standard Storz seals for couplings, suction connectors, blanking caps and reducers in all sizes: C(52), B(75), A(110) and the larger sizes 90, 100, D, 125, 150, 165, 205.

Internal-thread couplings are available with white NBR rubber or reinforced PTFE seals in all sizes and materials.

Storz System Accessories

• Hose tails for suction connectors — German aluminium, white NBR seal (to standards 14301, 14321, 14322, 14323)
• Hose tails for suction connectors — steel, white NBR seal, all sizes
• Lugs for suction connectors — Polish or German aluminium, all sizes
• Lug locking rings — steel
• Dust chains for Storz blanking caps — steel or stainless steel

Compatibility with Spitzer SF/SK Silo Trailers

The Storz components in our range match the factory-fitted standard on Spitzer aluminium silo trailers series SF and SK (manufactured in Elztal-Dallau). Lug spacing and thread types (internal/external, inch dimensions) replicate the configurations found on these vehicles, so couplings, caps and reducers fit without any modification to existing pipework.

For suction connections with a transfer hose we select the appropriate connector based on hose diameter and preferred mounting method (GBS clamps or DIN 2817 shell clamps). On Spitzer silo trailers operating a pneumatic conveying circuit, DN75 hose is the standard, and we maintain ready stock of connectors and 75x10 shell clamps accordingly.

Material selection is guided by the cargo being carried: AK 11 aluminium with NBR seal is adequate for PE/PP granulate and typical bulk dry goods; brass, stainless steel and Viton seals are specified for food-grade or chemical applications.

Common Faults on Spitzer Silo Trailers

In service practice, the most frequent cause of Storz leaks on Spitzer silo trailers is a worn or hardened seal — typically presenting as air hiss and dust blow-by at the joint during discharge. Replacing the NBR or Viton seal with the correct size (C, B, A or larger) restores a sound connection in most cases.

The second common fault is lug damage or wear from repeated coupling cycles, along with galvanic corrosion at the aluminium-to-steel interface. On GBS-clamp suction connectors, loose or corroded clamps are a recurring issue — replacement of the full clamp-and-seal set is the recommended fix. Smooth-shank connectors on shell clamps should be checked for clamp condition and bolt torque.

Availability and Delivery

Standard Storz couplings, blanking caps, reducers and seals are held in stock at the PHS Magnum warehouse in Chorula near Opole. Special versions (German aluminium, brass, stainless steel, Viton and silicone seals) are fulfilled via next-day direct delivery.

• Poland — courier dispatch
• DACH — delivery to Germany, Austria and the Czech Republic
• Collection — warehouse at Chorula near Opole, 4 km from the A4 motorway

Technical advice and Storz sizing support: Spitzer service desk, tel. +48 602 716 551. Full service scope: magnumchorula.pl/en/service/.

Related Categories

• Mallets and Storz Wrenches — rubber mallets and dedicated Storz spanners for coupling and uncoupling on-site
• Hose Clamps — GBS clamps and shell clamps for Storz suction connector mounting
• Hose Compartment Covers (Blanking Caps) — DN160/DN200 covers for one, two or three pipes; also plastic hose containers with bracket mounts
• Hose Compartment Keys & Locks — keys and locks for hose compartment closure
• Ball Valve Seals — PTFE/NBR seals for ball valves on Spitzer silo trailers
• Spitzer Spare Parts Catalogue — full category overview

See also: This category in the full PHS Magnum network catalogue (all makes) →

Author: Aleksy Pasternak — Managing Partner PHS Magnum, 20 years in the industry, ISO 9001:2015 internal auditor (DEKRA).