263 Choosing Hydraulic Systems 1. Cylinders Load and Pin Sizes: Cylinder size is determined by cylinder load and pin size. Stroke length is based on cylinder function. See page 232 to select cylinder. Double-pull, locking, and boom vang cylinders are also available. See charts for loads, pin sizes, and stroke lengths. Alternate End Fittings: Choosing the correct end fittings for your cylinders is criti- cal. See page 233 for end-fitting options. 2. Control Valves Select valves based on sailing style and valve style, type, and functions. Choose between multifunction panel and individual valves, standard or Grand Prix styles. Single- or double-acting valves are based on cylinder type. Individual Valve Assemblies: Individual valve assemblies are dependent on how the boat is sailed. Determine if there are multiple or single control locations. Choose valve, manifold configurations, and panel types. See page 240. Multifunction Valve Panels and Single-function Panels: Choose plate materials. Single and multifunction panels come with a 2-speed pump, pump han- dle, and reservoir. See page 241. Remote Dump Valves: Determine if there are remote dump valves required. Example: vang cylinders. 3. Pumps and Handles Individual valves require a separate pump. How many? Choice depends on oil vol- ume, how fast oil must move, and pressure required. Select ade- quate handle. See pages 243-244. 4. Reservoirs Reservoir Type: Reservoir type is determined by the amount of oil needed and pump height relative to the reservoir. Use a pressur- ized reservoir if it is mounted more than 1.5 m (5') vertically below the pump. Vented reservoirs are adequate under 1.5 m (5'). Reservoir Size: As a general rule, select reservoir size by adding up cylinder volumes and multiplying by 2. 5. Accessories Filters: Harken highly recommends a high-pressure filter between the pump and valves to keep valves working at peak performance. Also required is a suction filter for the pump to prevent debris from entering the system. Gauges: Remote analog gauges and digital transducers are available. Fittings: Plumbing fittings, additional spares, and spare parts available. See page 245-246. Hose: Harken offers hoses and fittings for both high- and low-pres- sure plumbing needs. Harken can also provide complete hose assembles to your specification. All high-pressure hose assemblies are flushed before shipping. See page 246. Backstay Vang Multifunction valve panel/ 2-speed pump 4-liter vented reservoir Suction filter Function Suction Return Standard System Function Pressure Suction Return Vang Outhaul Headstay Vang Outhaul Headstay Vang Outhaul Headstay High- pressure filter 3-speed hand pump 3-speed hand pump Grand Prix System String-pull dump valve 14 liter pressurized reservoir Suction filter Return filter (optional) 3-valve manifold/ pressure relief 3-valve manifold
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