At the far right is a return valve. The other valves from the top left corner are: Push valve, ball valve, turn valve, vacuum valve, and bench valve.

For all irrigation systems various components to conduct the water to the plants are required. The most simple system is leaking tubes or drip tubes while the most advanced, demanding most parts is a recycling system. For this a filling and draining valve is required, i.e. a valve that returns the water to the basin, feed tubes, and one or more basins. In some cases the filling and draining function is carried out in one valve, such as the HS-valve, which halves the required number of water tubes in the system. In other cases the draining is carried out through a separate valve or holes in the benches, e.g. as it is the case by mobile bench irrigation.

Return Valve

With recycling irrigation systems the water is pumped from the basin into the fertilizer mixer, where fresh water and fertilizer is added, and from there pumped out to the benches and distributed by means of bench valves. When the filling of the benches stops the water is drained off the benches and conducted through the return valve back to the basin.

Bench valve for drip systems

Recycling systems are not only used for ebb-flow benches or mobile con- tainer benches, they are also useful by drip irrigation on benches. There must be a slight slope on the bench. A bench valve with a tube mounted with capillary drips is placed at the end of the bench, and the tube is unrolled on the bench. On the bench the water is distributed by means of the capillary tubes. With a fibertex mat or the like an even better water distibution is gained. Surplus water is drained from the bench in the opposite end of the bench valve and lead back to the basin.

Manual Stop Cocks

For all irrigation systems it is possible to insert manual push, turn, or ball valves to stop the water supply e.g. to benches during packing or at times where the bench is empty. The valves have the same function and the one most suitable for the purpose is selected.

Vacuum valve

Drip irrigation systems will, in some cases contain air in the tubes after irrigation. By placing a vacuum valve in the system the tubes are bleeded before the water reaches the capillary tubes, thus avoiding uneven irrigations.

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Quick-valve

The Quick-valve, which meets the demands for a faster drainage of container benches, ensures an optimum plant and root growth. By virtue of a separate drain, the drainage time is reduced by more than 80% compared to the traditional mobile container irrigation valves.

The Quick-valve offers many advantages:

• When tilling the valves create a vacuum where by the irrigation water is oxidized.
• It is possible to regulate the time of filling dependant on the internal size of the hole.
• The valves can be connected to PEL-tubes dimensioned from 8 mm to 12.5 mm.
• As there are no movable parts in- side the Quick-valve is very reliable in service.
• In case you want to replace traditional bench irrigation valves this can be done right away as the traditional filling system can be used again.

Capacity of each Quick-valve: approx. 35 litres per minute until the siphon impact stops. i.e. when the table is nearly emptied for irrigation water. The rest will run off the table without using the siphon impact.

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HS Valve

The HS valve is designed for precise irrigation of ebb-flood benches. This self-cleaning valve both irrigates and drains the benches, ensuring they are regularly filled.

The HS valve can be delivered in different sizes, and consequently the irrigation time and amount of water can be adjusted exactly for every need. It is possible manually to disconnect a particular bench if it is not to be irrigated, e.g. when there are no plants on the bench. Simply turn the tap on the built-in ball-valve. At the same time you avoid an inconvenient increase of the humidity of the air because of the evaporation from an empty bench.

A dosing ball closes the drain when water enters the benches, and closes the inlet when water runs off the benches after irrigation stops. The run-off rinses the HS-valve.

It is compatible with recirculating systems: a strainer blocks spagnum and dirt from entering the return basin.

Drainage:
- 4.4 l/min with mounted dirt filter and 1/2" union
- 4.7 l/min without mounted dirt filter and 1/2" union
Maximum working pressure: 5 bar

Performance:	Flow (l/min)	Pressure (bar)
Hs valve type black top (10 L)	12.2 16.1 17.3	1.0 2.0 3.0
HS valve type yellow top (7.5 L)	8.2 10.6 11.0	1.0 2.0 3.0
HS valve type red top(5.0 L)	4.6 4.8 4.4	1.0 2.0 3.0