Greenhouse insulation antifreeze measures

Nursery with seedlings. Nutritional use of black plastic can absorb heat during the day, at night insulation and mulch, put plastic nursery seedlings in Yangshuo, the outside temperature at about 10 °C, the temperature within the bowl 6 °C ~ 7 °C, temperature within the nutrition chamber 10 Around °C, the seedlings can grow slowly and not be affected by freezing.

Prepare culture soil. Chicken manure is a hot manure. Cow dung is a mucus-rich, breathable manure. When the two are decomposed, they are taken 20% each, and the vegetable garden soil is 60%. This kind of nutrient soil has good heat absorption performance, and the seedlings have a good growth environment and a large number of root systems. long.

Scientific points seedlings. After seedlings were seedlings, new high fat film was sprayed in time to increase the survival rate and promote plant growth. At the same time, root irrigation with root irrigation promotes smooth flow of water, enhances the quality of roots for tillering, promotes dense rooting, rooting, strong roots, and increases root tube delivery nutrient capacity and metabolic frequency.

Water insulation. The indoor soil moisture content in winter should be moderate. Before winter, pouring enough water or selecting good weather (above 20°C) to fill enough water can prevent freezing. The root system is not suspended and the soil is kept warm. The root system will not be frozen.

Marine Valve Parts


The valve stem is an important part of the valve. It is used to drive, connect the actuating mechanism or handle, and directly drive the spool to move or rotate, so as to realize the function of valve switch or regulation.Valve stem in the valve opening and closing process is not only moving parts, stress components, but also seals. At the same time, it is subjected to the impact and corrosion of the medium, and it also causes friction with the packing. Therefore, in selecting the stem material, it must be guaranteed that it has sufficient strength at the prescribed temperature, good impact toughness, scratch resistance, corrosion resistance. The valve stem is a vulnerable part, and the mechanical performance and heat treatment performance of the material should be paid attention to when selecting.The valve stem in the valve opening and closing process, under tension, compression and torsion force, and direct contact with the media, as well as the relative motion between the friction and filler, so in the choice of stem material, must ensure that it provides adequate temperature strength, good impact toughness, abrasion resistance and corrosion resistance of.


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