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NOTE: A most important part of achieving water conservation with maximum water savings and unmatched flexibility from LittleValve sprinkler products with In-stem Flow Regulation (IFR) is knowing what nozzles to use for the particular situation you come across.  This page should help.

Therefore, the trick to LittleValves is knowing what nozzles to use.



A.  Fixed Sprays & VANs (Variable Arc Nozzles – adjustables): With fixed spray nozzles, we recommend using only 15’ nozzles down to 6’, and Flat-spray nozzles from 6’ down to 2'.  With VANs, use any size you want. However, if you should encounter misting and fogging, then you should upsize to a larger VAN nozzle until the misting has gone away.

B.  Side Strip Nozzles: Only with LittleValves can side strip nozzles be brought down to 3’ to 4’ left and right. Normally the 15’ left/right spray of side strip nozzles cannot be controlled. In most situations, we must recommend the SS530 nozzle made by Hunter as it assures water will spray out evenly from the front of the nozzle at any left/right distance setting. For ends of planters, use corner strips – LCS515 and RCS515.  9’ X 18’ side strips from all manufacturers are also very useful when used with LittleValve parts.  For watering side strips at a left/right distance in excess of 9 -10 feet AND when using Toro's Precision Rotating Nozzle (PRNs) on other sprinklers in the same valve system, we recommend using Toro's Precision SPRAY Nozzle (PSN) 4 X 30 side strip as its flow rates at those distances are more compatible with the flow rates of the PRN.

C.  LittleValve Drip: For pop-up sprinklers, Rain Bird’s 18’ VAN (adjustable nozzle) can be brought down to as low as a 15” drip steam dispensing water at the rate of approximately 9 gallons per hour. (GPH)  For above-ground stationary sprinklers use Valvette System's BS50, which threads onto our 1/2" Riser Extender (RX550) or onto a 1/2" riser nipple that is connected onto our 1/2" Coupling (CP050). Then with the LittleValve, the throw distance can be brought down to as low as 6" dispensing water at the rate of 2 GPH.  [See the BS50 pictures in the "Drip & Micro-Spray Information" tab.] To water 2 plants at the same time, use 5CST-B nozzles. Significant water savings can also be obtained in shrub or flower beds using 5-foot stream bubblers because they can be reduced down to 9” diameter using about ¼ gpm. Plus, stream bubblers, i.e. 5H-B, work very well in Rose gardens and under established bushes. The 5F-B nozzle is the best for round planter areas or pots 9” or larger. Use the 5Q-B to water trees, which puts water on 2 opposite sides of a tree without hitting the trunk. Learn more in the "Drip & Micro-Spray Information" tab.

D.  LittleValve Micro-Spray: Small tight areas especially near buildings are always challenging to the irrigator. Rain Bird’s (8 FLT) and Toro’s Flat-Spray can be so controlled with LittleValves that they are the very best micro-spray sprinklers available today. Rain Bird’s optimum range is from 2½’ to 6’, whereas Toro’s Flat nozzle can be brought down to 2’ but uses slightly more water. Also, use 6’ VANs and Hunter’s SS530 side strips in 3’-4’ areas. LittleValves provide micro-spray application without misting or pressure regulation and is the world’s easiest micro-spray to maintain and service. The average application rate is 15-20 gallons per HOUR.

E.  Rotary Nozzles:

1) Toro’s Rotary – PRN (Precision Rotating Nozzle) - Has the largest distance range of all rotaries; can be adjusted from 20' - 28' down to 14" - 18" with LittleValves. Adjustable Arc range: 45 - 270 degrees. NOTE: Testing has concluded that the PRN easily maintains a radius distance of 1½ feet.  Testing commenced on April 5, 2013 and has continued until today.

2) MP Rotators - LittleValves can bring the 3000 model down to about 17 - 18 feet; 2000 models down to 11 - 12 feet.  One important help LittleValves give to MP Rotators is that it is much easier to control distances with the LittleValve than it is to play around with the very tiny adjustment screw atop the MP Rotator.  Even professionals have problems with that screw.  It's a breeze to adjust distances when you have In-stem Flow Regulators.  Adjustable Arc range is 90 - 210 degrees in one model, 210 - 270 degrees in another model.

3) Rain Bird’s rotary nozzles - LittleValves can bring the 17’ – 24’ models down to a 4 – 5 foot radius.  Adjustable Arc range: 45 - 270 degrees.  Rain Bird’s 13’ – 18’ model is never needed, hence is rendered obsolete with LittleValve parts.

F.  Precision Spray Nozzles - PSN: Precision Sprays are a fixed-spray nozzle therefore, you should use only 15-footers with LittleValve parts or Little Tuffy pop-ups. You will find that a Precision Spray 15’ nozzle connected to a LittleValve part can easily be brought down to 6’ or 7’ and all misting and overspray eliminated regardless of pressure.

NOTE re shrub adaptersRotary nozzles and PSNs do not fit into LittleValve shrub adapters, therefore for installing PRNs or PSNs onto shrub adapters in shrub and ground cover areas, connect a LittleValve coupling (CP050) onto the vertical riser coming up out of the ground.   Onto the top of the CP050, connect a minimum 2" nipple.  Then connect a conventional shrub adapter, (available in the Stationary LittleValve Parts section,) on top of the nipple to receive the PRN or PSN.   Please see the picture below.

Side and Corner Strip Nozzles that can be mixed with PRNs on the same Valve Systems

When combined with LittleValve parts or sprinklers, Precision Rotating Nozzles (PRNs) will – in almost all cases – likely be the only radius nozzle you will ever need if the distance range is anywhere between 14 -18 inches [regardless of pressure] up to 20 – 28 feet [depending on pressure].  However, PRNs do not replace side strips, center strips or corner strip nozzles.  

There will be many times in which you as the irrigation specifier, contractor, consultant or even a homeowner, will encounter situations where you will need to incorporate side strip nozzles into the same valve system as your PRN radius nozzles or any other rotating nozzles.

The idea is to always keep flow rates of the different sprinklers on any given valve system as close as possible.  The following recommendations are made with that goal in mind.

 1. If the left/right side distance the side strip needs to cover is 9 - 10 feet or more on each side, use Toro’s Precision Spray Nozzle (PSN) 4 X 30 side strip or 4 X 15 LCS/RCS corner strips.  The flow rate of this nozzle when opened at 7 - 10 feet or more on each side is similar to the flow rate of the PRN.  This nozzle typically does not do a good job of watering when taken down less than 7 or 8 feet – left and/or right – even with LittleValves.  The PSNs do come in both male and female styles.  There is also a 4 X 18 foot model, which allows a little more flexibility for the lower distances.

PSNs are on the rebate list of the Southern California Metropolitan Water District (MWD).

 2. If the left/right side distance the nozzle needs to cover is under 5 - 6 feet on each side, use Hunter’s SS530 – a 5 X 30 side strip or LCS/RCS 515 corner strips.   The flow rate of this nozzle when opened at 6 or less on each side becomes more similar to the flow rate of the PRN.  With LittleValves, this left/right distance can be taken all the way down to 2 - 3 feet left and right and water will always exit out in front of the nozzle, which other side strips just cannot do.   Hunter’s side and corner strip nozzle line comes only in female styles. 

Unfortunately, Hunter's side strip nozzles are not on the rebate list of the Southern California Metropolitan Water District (MWD).

After years of working with LittleValve products, we came up with the above recommendations.  We have proven to ourselves over and over that these combinations work best and even though there might not be matched precipitation between all the nozzles, the end result is significant water savings with a great-looking landscape with little or no overspraying, little water lost to misting/ fogging when high pressure exists, and rarely are there pockets of excess water usage ever being detected.

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