Answer: In the early spring, when the temperature is low and rainy, the occurrence of peach leaf thinning is relatively heavy, and the first spraying can be started when the flower buds bloom red. Agents can be used: 2 to 4 Baume degrees lime sulfur, or equal amount of Bordeaux mixture 100 times, or 50% carbendazim, 70% thiophanate-methyl WP 800 to 1000 times. And timely removal of diseased leaves, concentrated burning lesions to reduce the source of bacteria.
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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