The spraying distance (range) of the metal rocker arm nozzle is mainly adjusted by three means: adjusting the nozzle, adjusting the spring, and adjusting the working pressure. The first two are mechanical adjustments on the nozzle body, and the latter is pressure adjustment on the pipeline network.
1. Changing the nozzle - the most direct and effective
The spray distance and nozzle diameter are directly linked: the diameter is large, the spray distance is far, and the water volume is large;
; Small caliber, close spray distance, and fine water droplets.The nozzle is usually equipped with a set of spare nozzles (such as different specifications such as diameter 3.0, diameter 3.5, diameter 4.0mm, etc.) when it leaves the factory. If you want to spray far, switch to a large-diameter nozzle, and if you want to spray close, switch to a small-diameter nozzle.
When changing the nozzle, pay attention to aligning the threads, tighten the raw material belt, and do not leak water.
. This is the only method that can significantly change the spray distance. Generally, the spray distance range is between 10 and 30 meters, and changing the nozzle can adjust it from more than ten meters to more than twenty meters.2. Adjusting the elasticity of the rocker arm spring - fine-tuning the spray distance and speed
The degree of tightening of the rocker arm spring directly affects the rotation speed of the nozzle, and the faster the speed, the shorter the range (rotation will consume the kinetic energy of the water tongue, generally reducing the range by 10% to 15% at high speeds).
Adjustment method:
To increase the spray distance, loosen the rocker arm spring appropriately. If the rocker arm speed slows down, the range will be longer.
.Want to reduce spray distance → Tighten the rocker arm spring a bit, increase the rocker arm speed, and shorten the range.
.Adjustment principle: Under the premise of not generating local water accumulation and runoff, the speed should be slow rather than fast.
. The speed of the medium range nozzle is generally controlled at 1-3 revolutions per minute.III. Adjusting the installation height of the rocker arm (draft depth) - indirectly affecting the spray distance
The rocker arm adjustment screw can change the "draft depth" of the rocker arm in the water flow:
Lowering the rocker arm (draft depth) → the rocker arm is subjected to greater force, the speed is increased → the spray distance is shortened.
.Raise the rocker arm (shallow water intake) → Lower the force on the rocker arm, slow down the speed → Increase the spray distance.
. This adjustment is usually used in conjunction with spring adjustment for a more precise effect.Fourth, adjusting working pressure - the simplest but requires coordination with the pipeline network
The nozzle spray distance and working pressure are positively correlated:
Pressure (kPa)Approximately range variation
150 (low pressure)The range is the closest, about 9-12m
250 (medium pressure)Medium range, about 15-18m
350 (high pressure)The farthest range is about 20-22m
If you want to spray further, increase the outlet pressure of the water pump, and if you want to spray closer, close the valve to reduce the pressure.. However, the pressure should not exceed the rated range of the nozzle (usually 150-350kPa), otherwise it will damage the seal and accelerate wear.
Fifth, adjust the fan angle - do not change the spray distance, but change the coverage range
If you mean "spray distance" refers to how wide the nozzle can spray in a fan shape, then you need to adjust the limit pin (also known as the limit ring):
The angle between the limit pins is large → the fan angle is large, and the coverage range is wide.
.The angle between the limit pins is small → the fan angle is small, and spraying is concentrated. The direction of the limit pin determines which side the fan-shaped spray should be directed towards, and it can be aimed at the area that needs irrigation.
Quick summary: Priority for adjusting spray distance
PriorityAdjustment methodEffectDifficulty
⭐⭐⭐ PreferredChange nozzleSignificantly change spray distance (± 5-10m)Simple, just unscrew and replace
⭐⭐ Cooperate withAdjust the spring tightnessFine tune the spray distance (± 1-3m) while affecting the speedUse a wrench to tighten the spring seat
⭐ AssistAdjust the working pressureIncrease or decrease the spray distance as a whole (± 3-5m)Adjust the valve or water pump
⭐ AddAdjust the height of the rocker armIndirect adjustment, combined with the springTighten the adjustment screw
How to verify after adjustment?
After turning on, stand on the side of the nozzle and observe:
The water tongue is dense and the range is stable → the adjustment is correct.
.The range is sufficient, but the water tongue is scattered and not formed → the nozzle may be worn or the flow channel may be blocked, clean it first and then adjust it.
.The speed fluctuates rapidly → If the rocker arm shaft is loose or the spring seat is not locked, tighten it again and add oil.
.The range is obviously not enough but the water pressure is normal → Most likely, the speed is too fast, just relax the spring a little.
. One sentence: If you want to spray far, change the nozzle, loosen the spring, and apply pressure; If you want to spray closer, change the nozzle, tighten the spring, and reduce the pressure. First, change the nozzle to a larger range, and then make slight adjustments with springs and pressure, which is basically enough.