Pressure Compensating Spray Stakes

Grey Two-Way Pressure Compensating Spray Stake
Plum Pressure Compensating Spray Stake

Netafim PC Spray Stakes are pressure compensating with a check valve for improved control of water and fertilizers. The efficient spray pattern wets the soil surface to maximize water retention while misting is nearly eliminated and wind drift is prevented. The simple construction, easy close-off mechanism, and resistance to sunlight, fertilizers and chemicals means long-life reliability.

SUPERIOR WETTING OF THE SOIL MIX

The PC Spray Stake pattern angles downward - just enough - to keep the spray on the soil and not flying into or over the wall of the pot. Water retained by the soil mix is the most important measure of the effectiveness of a spray stake. The Netafim spray pattern provides maximum water retention by the soil mix - exactly what the plant needs. An additional benefit of the excellent wetting pattern is the uniform activation of top-dressed fertilizers. The result is superior plant growth and more efficient use of water resources.

UNIFORM WATERING FROM THE FIRST TO LAST POT

Pressure compensating spray stakes ensure every pot in the entire system receives exactly the same amount of water. This eliminates the need to overwater some plants to be sure the driest plants receive enough water to thrive. This water savings is typically between 55% to 20% and can be even more.

ELIMINATES MISTING

Non-compensating spray stakes produce a lot of mist that is wastefully blown away especially on a windy day. One more advantage of pressure compensation is that it conserves water. Even at high pressures, up to 60 psi, the pressure compensating mechanism and the downward water spray of the Netafim PC Spray Stake eliminate misting.

EFFICIENT SPRAY PATTERNS

Pick the spray pattern that is right for your plants. The single spray pattern spray stake can be placed near the edge of the pot. The double spray pattern spray stake is useful for optimized wetting in very coarse mixes or large pots. It also allows positioning of the spray stake near the stem of the plant which can minimize wetting of the base of the stem.

SIMPLE, SECURE SHUT-OFF

The side-mounted, secure shut-off is easy and fool proof. For close off, remove the nipple and tubing from the top of the spray stake and attach it to the side of the spray stake. This provides a clear, visual indication - even from a distance - if a unit is in the on or off position.

ADAPTABLE TO ALL SOIL MEDIA TYPES

Stake or rod mount options allow more application options and greater flexibility. The rod mount spray stake is ideal for deeper insertion into coarse bark mix for added stability and greater allowance for height adjustment to increase the size of the wetted pattern.

Grey Two-Way Pressure Compensating Spray Stake
Plum Pressure Compensating Spray Stake

Pressure Compensating Spray Stakes Selection

FIRST - SELECT THE FLOW RATE FOR THE SPRAY STAKE

As long as you have enough water and pressure for the stake you select, it’s hard to go wrong. Netafim PC Spray Stakes will work in a very wide range of pot sizes (see table at right for general recommendations). Just remember, these are not strict limitations, just general guidelines. Many growers with larger pots use higher flow spray stakes while others prefer to use lower flow spray stakes and simply operate them longer.

The next consideration is how long a row or ‘run’ of pots you want to water. Lower flow spray stakes can water longer runs than higher flow spray stakes. See the Design Help section of this brochure to be sure the flow you select will be appropriate for your water resources and field configuration.

SECOND - SELECT THE SPRAY PATTERN

Most flow models offer both a single and a double spray pattern. The double spray pattern is selected when the stake will be placed closer to the trunk of the tree than the side of the container. Here it will wet more soil than the single spray and can be positioned to minimize wetting the base of the trunk.

THIRD - SELECT THE SPRAY STAKE MOUNTING OPTION

Choose either the standard stake or the rod mount stake. Growers choose the rod mount generally for these reasons:

  • For very coarse bark planting mixes a longer stake is needed to provide good stability
  • To raise the spray stake up a bit more to create a larger spray pattern
  • For the widest range of height adjustability

SPECIFICATIONS

Grey Two-Way Pressure Compensating Spray Stake
Plum Pressure Compensating Spray Stake

Pressure Compensating Spray Stakes Design Info

STEP 1

Determine how many spray stakes you can operate at the same time. Use the Zone Flow chart to establish how much water it would take to operate one zone of spray stakes with the spray stake flow rate you have selected. You do not need to operate the maximum amount, but do not exceed the maximum. If the amount of water required exceeds the amount you have available, you might reduce the zone size or consider using a lower flow spray stake. Suggestion: Build a table listing the flow of each zone you wish to operate.

STEP 2

Determine how long a row or ‘run’ you can make with each line of spray stakes. This is influenced by several factors and you can balance them according to your priorities. The Length of Run Considerations chart demonstrates how the influencing factors are related.

When the spacing for the spray stakes has been determined, you are ready to select the pipe size and operating pressure:

  • There are four Length of Run charts, one for each flow rate.
  • Select the chart based on the flow rate you will be using (see pages 9 and 10).
  • Select the spacing to be used for the spray stakes. Reading across to each pipe size, find the maximum length of run (in feet) available for several inlet pressures (in psi).
  • Each option also includes the number of pots for that length of run (shown in parenthesis).

Note: The Length of Run charts do not account for slope. Although the pressure compensating feature of the PC spray stake will ensure that all flows will be the same, it is still necessary to operate the spray stake with a minimum of 22 psi and a maximum of 55 psi. If you are working with slopes, it is advisable to use a qualified Netafim Dealer to assist you in your design to be certain you have a pressure balanced system.

STEP 3

Select the major system components. Once you have selected the spray stake, established the flow of each zone and sized the poly pipe, it is time to size the major system components. Several key components and the most commonly selected models are listed here. For additional options, contact Netafim USA Customer Service.

Valves

Netafim offers Valve solutions for nearly every need. The Valves chart shows the most common valves used in spray stake systems and includes electric solenoid valves for automatic systems (used with a controller) and pressure reducing valves to manage system pressure in a manually operated system with high pressures (over 60 psi).

Filters

Filter options include disc, screen, sand media and hydrocyclones (for sandy wells). Some filters are for specific water applications and some are multi-purpose. Excellent options are available for both well water and surface water sources. Recommended filtration is 120 mesh.

Water Meters

Water Meters are the simplest and best ‘window’ into what is going on in your system. The key to a long lasting, low maintenance system is through preventative maintenance. A periodic check of the water meter can tell you when it’s time for maintenance.

Automation

Growers considering automation should visit our website or call 888-NETAFIM to request brochures relating to Automation Products. With a variety of controllers to fit many needs; from 16 to 600 valves with standard multi-wire, dual strand cable, stand-alone, radio control or central control, you can start with simple or richly featured programs and immediately realize the full potential of an automated system.

Piping, Fittings and Accessories

Netafim offers a wide selection of Polyethylene (PE) Pipe, Fittings and Accessories used in a successful spray stake system. Your qualified Netafim dealer should be able to guide you through this selection process.

Grey Two-Way Pressure Compensating Spray Stake
Plum Pressure Compensating Spray Stake

Use the following Ordering Charts to determine the correct PC Spray Stake for your application. A complete PC Spray Stake Assembly consists of one (A) Spray Stake (either standard or rod mount) and one (B) Dripper Assembly (see illustration).

ORDERING CHARTS