Buffer systems

In order to prevent your robot(s) from standing idle for a long time during the cleaning and emptying of the milk tank, Boetech has developed the buffer system. Consequently there is no loss of capacity of the robot during each collection round. It also provides the dairyman with an opportunity to personally do a regular visual check of the main tank. The buffer tank is cleaned three times a day simultaneously with the main cleaning of the milking robot.

Advantages of the buffer system:

  • Milking during the cleaning of the main tank. No interruptions in the cow-rhythm.
  • Compact. The buffer tank can be fitted into (almost) every existing situation, no alteration costs.
  • Very hygienic. The buffer tank and the valve system are cleaned three times a day simultaneously with the cleaning of the milking robots.
  • No annual maintenance. The buffer system has no milk pump or own cleansing system that needs maintenance.
  • Inspection of the main tank. Because of the buffer time, it is possible to do a visual inspection of the main tank after cleaning.
  • No extra cleaning costs. No extra cleaning agents and energy costs
  • Favorable price/performance ratio. The Boetech buffer system is a relatively simple, yet very efficient and affordable system.

Requirements for the main milk tank:

  • The main tank must be equipped with an automatic cleaning system.
  • The inlet of the milk tank must be situated at least 20 cm below the outlet of the buffer tank (the higher the better). Especially in a silo tank, this is important. If this is not possible, a pressure system should be installed on the buffer tank.

The location of the buffer tank:

  • If possible, install the buffer tank ahead of the milk tank. This allows the distance between the buffer tank and the milk tank to remain as short as possible, and results in a better milk quality and lower costs. If installation of the buffer tank ahead of the milk tank is not possible, it can also be placed behind or next to the milk tank.
  • If a milk line is positioned at 30 cm above the floor, there should be no walkway between the buffer tank and the milk tank.
  • It is recommended that the buffer tank be placed above a floor drain.


Which buffer tank do you need?

The type of buffer tank needed will depend on the number of milking robots, the maximum milk production per hour, and the time needed for cleaning of the milk tank. If the buffer tank is placed near the inlet of the milk tank, installation costs are lower due to the short distance between the buffer tank and milk tank. The installation of a buffer tank may take less than a day. Figure 3 shows the different types of buffer tanks. Contact Boetech for more information.

Number of robots 1-2 1-2 3-4 3-4 3-4 4-8 4-8
Buffer tank 250 350 500 650 800 1 200 1 600

Indication of buffer tank type and number of milking robots.

Valve systems

Boetech offers two different valve systems for the buffer tank, namely a DN20 valve system and a larger DN25 valve system. Research shows that the difference in emptying time is more than 30%. The table below shows how much time it takes for a 500 buffer tank to empty completely using the two valve systems.

  DN20 Double DN20 DN25 Difference
500  21 min 44 sec 12 min 25 sec 12 min 30 sec 42.48%

We recommend that companies with more than three robots use the larger DN25 valve system or a double DN20 valve system.

This allows for a quicker and more complete emptying of the buffer tank.

If you have two clusters robots, a double valve system should be fitted, because these clusters milk and cleanse independently of each other.

Figure 4 shows the possible combinations of valve systems and buffer tanks.




  • Level sensor: Mandatory on the larger buffer tanks and when a pressure system is used. Boetech shall not be responsible for any loss of milk if no level sensor has been installed in a buffer tank.
  • Air pressure system: An air pressure system can ensure that all the milk flows out of the buffer tank. An air pressure system is required if the bottom of the buffer tank is positioned lower than the milk tank, or when, during the emptying process, the milk level is the same in both tanks.
  • Control panels for buffer systems. Boetech supplies various control panels for operating the buffer tank. The control panels communicate between the robot and the milk tank when control by the CRS+ is insufficient or not possible.


Possibilities for a standard control panel: 

– Can display the status of the robot and of the buffer system.

– Can display alarm notifications concerning the buffer system and the milk tank.

– Can separate pre-rinse water from main-wash water.

– Can control the water temperature during the main cleaning of the robot.

– The optional tank-monitoring module with intermittent cooling can automatically start the cooling of the milk tank.




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