Fill / Discharge Hose Assembly with Camlock Coupling

Function

During pump-assisted discharge to road base or prime coat spreader bars, the hose carries full pump delivery pressure with cyclic pressure pulses as spray section valves open and close. The camlock coupling design locks the hose to the tanker or tank fitting with two lever-actuated cams that engage a grooved adapter, providing a positive sealing force without thread engagement — threads are vulnerable to cross-threading and bitumen fouling on site. Viton (FKM) cam groove seals retain flexibility and sealing integrity at sustained temperatures up to 200 °C (392 °F), unlike standard NBR seals which harden and crack in service.

Construction & quality

Hose inner tube: smooth-bore PTFE or high-temperature NBR compound, bitumen-rated for full temperature range. Reinforcement: one or two layers of stainless steel wire braid to the required working pressure. Outer cover: black EPDM or thermoplastic compound, heat-resistant and abrasion-resistant for site conditions. End fittings: 316 stainless steel ferrules, hydraulically swaged — not clamped — onto the hose body for a permanent crimp bond. Camlock bodies: aluminium for standard service or 316 stainless steel for high-corrosion coastal or tropical environments. Cam seals: Viton (FKM) compound, 230 °C rated. Standard lengths 3 m, 5 m and 6 m (10 ft, 16 ft, 20 ft) to order.

When to replace

• Outer cover shows blistering, deep cracking or visible wire braid — hose tube integrity is compromised
• Hose body becomes stiff and inflexible — inner tube material has aged and hardened
• Bitumen seep or drip from the crimped ferrule or the end fitting to hose junction
• Cam levers fail to lock fully or spring open under pressure — cam groove worn or bent
• Viton cam seal torn, extruded or hardened — visible bitumen leakage at the coupling mating face