Catalogue HY07-1210/UK

Roundline Cylinders

Manufactured from precision ground, high tensile carbon alloy steel, hard chrome plated and polished to 0.2 m max.Piston rods up to 110mm in diameter are induction casehardened to Rockwell C54 minimum before chrome plating.This provides a 'dent resistant' surface, resulting in improvedseal life. Piston rods of 125mm diameter and above can becase hardened on request. All rod and piston assemblies are designed to be fatigue free at full rated pressure. Seals are housed in a corrosion-resistant steel gland, featuring heavy duty polymer bearing rings to resist side loadings. Wide separation of these rings reduces bearing stresses, maximising the service life of the bearing. The rod gland may be screwed or bolted. On bore sizes up to 100mm the rod gland is screwed (illustrated above). On larger bore sizes the rod gland is bolted.The polymer bearing rings, with the rod seals, are easilyreplaced on removal of the rod gland, and all components may be serviced without further disassembly of the cylinder. The head and cap are bolted to heavy steel industrial flanges, which are retained by threads at each end of the cylinder body. A variety of gland and piston seal options is available, to suit different applications, as shown opposite. In addition, MMA cylinders can be designed and manufactured to suit individual customer requirements. Please contact the factory for details.The gland seals listed opposite are located in a screwed orbolted gland housing, and provide efficient retention of pressurized fluid while preventing the ingress of contaminants. The heavy wall steel tubing is honed to a high surface finish, to minimise internal friction and prolong seal life. These are machined from steel and located into the cylinder body's internal diameter for added strength and precise alignment. Both the head and cap are sealed by O-rings which, in turn, are protected by anti-extrusion rings. Optional cushions at the head and cap are progressive in action, providing controlled deceleration which reduces noise and shock loading, and prolongs machine life. The head end cushion is a self-centring sleeve, while the polished cap end spear is an integral part of the piston rod. Needle valves are provided at both ends of the cylinder for precise cushion adjustment, and are retained so that they cannot be inadvertently removed.Check valves manufacturer at the head and cap ends of the cylinderminimize restriction to the start of a stroke, permitting full power and fast cycle times. The head end check valve is incorporated into the fully floating cushion sleeve, while the cap end employs a floating bronze cushion bush.

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