![]() ![]() If the spring is too heavy for the pressure being used (any adjustment barely touches the spring when pump is turned off).When the booms are closed the ‘fixed orifice’ doesn’t compensate and pressure rises to force the increased flow through that small orifice. In order to obtain sufficient pressure the operator tightens the spring until it is virtually collapsed, essentially creating a fixed orifice. ![]() The spring may be too weak for the pressure being used (i.e.Technically, a spring can either be too weak, or too heavy: ![]() Make sure you know what you’re doing if you’re considering this option. Recognizing this problem, some operators have teed-in a second relief valve capable of finer adjustments at lower pressures. As a result, flow increases over the remaining boom. This would manifest when one boom is shut off for single-boom operation there may not be enough pressure to open the bypass. This is common when people switch from disc-core nozzles operated at higher pressure to molded nozzles operated at lower pressure. Sprayers operated at lower pressure may be unable to compress the spring. Relief valve springs match the maximum pressure range of the pump. Sometimes, the relief valve may be mechanically sound, but the spring may not be sized to match a reduced operating pressure. You should understand your sprayer’s design before you perform any maintenance, adjustments or calibration. Replace the spring, lubricate and adjust.īe sure to read the operator’s manual before you do anything. Be aware that any leak (external or internal) can contribute to this condition and tightening the spring isn’t the solution. Repair (or replace) the regulator, then lubricate and adjust. This means that when the booms are shut off, the pressure increases until it reaches the ‘new’ spring balance point. You may have already tightened the spring to compensate, but this loads the spring past the pressure balance point you want to spray at.
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