247 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 critical. 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 loca- tions. 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 handle, 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 volume, how fast oil must move, and pressure required. Select adequate 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 pres- surized 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- pressure 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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