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800AG-4

800 SERIES CONTROL VALVES

CONTROL VALVE APPLICATION GUIDE

By Tom Young, P.E., M.S.

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Summary of Contents for 800 Series

Page 1: ...800AG 4 800 SERIES CONTROL VALVES CONTROL VALVE APPLICATION GUIDE By Tom Young P E M S...

Page 2: ...alveiscontrolled byarubbersleevewhichisactuatedbyhydraulicpressure Thevalveiseitherinthefullyopenedortheclosed shutoff position The AUTO positionontheselectorhasnoeffectonvalvecontrolbutisusedwhenthev...

Page 3: ...hydraulicremotecontrolwhicheliminatestheneedforwiresinthefield Seesection2 4 2formoreinformation on the hydraulic remote function Contact the factory for specific details on the special function valve...

Page 4: ...rp 848 Airport Rd Walla Walla WA 99362 2271 USA Tel 509 525 7660 Fax 509 525 7907 E mail info nelsonirrigation com Web site www nelsonirrigation com Control Valve Application Guide Figure 2 TYPICAL CO...

Page 5: ...be removed to open the valve PRESSURE REDUCING ELECTRIC ON OFF VALVE CONTROL FUNCTION items D2 through D4 E20 through E72 on the VALVE SELECTION GUIDE The PRESSURE REDUCING ELECTRIC ON OFF model of th...

Page 6: ...ng straight pipe will help Also use of a straight pipe on the upstream end of the valve will help To be effective the upstream pipe should be a minimum five pipe diameters long 3 0 PROPER VALVE SIZING...

Page 7: ...GPM Cv Valve sizing coefficient flow rate at which one psi DP occurs NOTE Cv provides an index for comparing the capacities of different size valves The Cv coefficient is defined as the flow GPM whic...

Page 8: ...ter is to be used then it is best to locate it downstream of the valve 4 0 UNDERSTANDING HOW THE PRESSURE CONTROL REGULATOR WORKS TheregulatorusedontheNELSON800SeriesControlValveisathree way 3 way reg...

Page 9: ...e upstream water is applied to the sleeve chamber The flow is closed off by the sleeve against the center seat SOLENOID CONTROL HOW PRESSURE CONTROL WORKS 10 PRESSURE REDUCING CONTROL Pressure lower t...

Page 10: ...ering the water for the pressure control solenoid and other control components is needed for reliable operation The internal filter provides some self cleaning and the external filter has the advantag...

Page 11: ...n cause water hammer in the case where no valve is used Severewaterhammercancausedamagetopipes pump pressure regulators and seals The water hammer shock waves move at the speedofsoundinwater 4660ft se...

Page 12: ...ngontheamountofcurrentrequiredtooperatethecontrolleritself and the number of valves that the controller is designed to operate per station A qualified licensed electrician should be employedtoinstalla...

Page 13: ...rom controller to valve FOR VARIOUS WIRE SIZES for 24VAC solenoid OPTION E41 Inrush 1 1A Common Power Wire AWG Wire AWG 18 16 14 12 10 8 6 18 246 302 353 395 427 449 464 16 302 391 481 561 628 678 713...

Page 14: ...to the valve from the controller L 3 maximum expected line pressure on the valve solenoid 4 the allowable voltage loss AVL in the wire without affecting function of the solenoid 5 controlleroutputvol...

Page 15: ...er required to move the solenoid plunger Very low holding power is desired to reduce draw down of the batteries or storage units Two wire controls are more common and easier to purchase worldwide THRE...

Page 16: ...e dramatically with changes in flow rate The valve is close to the drip tape Choose the 5 50 PSI pressure control because it will maintain 10 PSI more accurately than the higher pressure controls Choo...

Page 17: ...H2 FEATURES Theexternalstylefilterisequippedwith a100meshscreenwhichgivesmuchgreaterfilter screen surface area than the internal filter This could mean less frequent cleaning required The screen can...

Page 18: ...n the control tube When power is off the Normally Open NO port is is connected to common The NO port is generally attached to upstream Manual selector valve Remote hydraulic relay Reducing Pressure Co...

Page 19: ...d within the working specifications for which the product was designed and under normal use and service The manufacturer assumes no responsibility for installation removal or unauthorized repair The m...

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