The ‘block design’ of the control valve has fewer separate components and connections compared with traditional valve configurations and therefore decreases the probability of leaks and corrosion damage. This reduces maintenance costs and ensures that parts can be replaced swiftly as they are available in stock. The manually-operated valve groups are modular, with cartridge-type pressure and flow control valves. MacGregor has paid particular attention to this issue and has developed special modularised valve groups for each hatch cover type. Effective speed control is also important for side-rolling hatch covers. This is particularly important when the hatch cover is near to the open position, where the constantly changing geometry dictates that the speed naturally increases. Good control of the operating speed is essential for the safe movement of high-stowing folding hatch covers. Valve groups control the various hatch cover operations. The bronze, spherical bearings on both ends of a MacGregor cylinder dramatically extend the service life of the bearings and pins in comparison with any other design. The cylinder cover is bolted to the cylinder body, so that it can be easily dismantled for maintenance. For large cylinders a top seal and wiper ring are used.įor additional protection of the piston rod surface, the space between the top seal and wiper ring is fitted with grease nipples. MacGregor has tackled piston rod corrosion through the use of stainless steel rods (single-acting cylinders) or stainless steel sleeves over the rods (for double-acting cylinders where part of the piston rod remains exposed in a retracted position). Hydraulic components that are particularly prone to weathering include cylinder piston rods that can corrode and bearings that may seize.
They are a cost-efficient solution without compromising the ability to withstand marine conditions. Medium speed motors with planetary gears are used for chain-driven side-rolling panels. During operation the valve improves motion control by adapting continuously to any alternation of the load condition.
MacGregor uses slow speed hydraulic motors with an integrated load-holding valve that provides operational safety by holding the load in position when hydraulic system is not in operation. This allows water to drain easily off the motor and prevents rusting. The design responds to the challenges of marine environments by having smooth surfaces with no grooves or recesses.
This type of motor is used for rack-and-pinion type side-rolling hatch covers and for large single panel chain-driven side-rolling hatch covers. Hatch cover controls for hydraulic systems Harsh operating conditions on deck dictate that MacGregor only uses high-quality, specially-designed, reliable hydraulic and electronic control system components from select suppliers.
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