The current upward trend is difficult to sustain. Although petrochemical and market inventories are currently in a tight situation, the supply pressure in the future is still relatively large.
L rebound is limited, and the test is supported near 8100. Near the Spring Festival, the start of the Spring Festival holiday in the spot market has declined, demand is not good, petrochemical inventories are gradually increasing, and it is expected to maintain a range of shocks in the short term.
Jiuzhi Plastics Network
A ballcock (also balltap or float valve) is a mechanism or machine for filling water tanks, such as those found in flush toilets, while avoiding overflow and (in the event of low water pressure) backflow. The modern ballcock was invented by José Antonio de Alzate y RamÃrez, a Mexican priest and scientist, who described the device in 1790 in the Gaceta de Literatura Méxicana.[1] It consists of a valve connected to a hollow sealed float by means of a lever, mounted near the top of the tank. The float is often ball-shaped, hence the name ballcock. The valve is connected to the incoming water supply, and is opened and closed by the lever which has the float mounted on the end. When the water level rises, the float rises with it; once it rises to a pre-set level, the mechanism forces the lever to close the valve and shut off the water flow. This is an example of negative feedback and of proportional control.
Ball Cock, Brass Ball Bibcock, Ballcock Valve, Toilet Ballcock Valve
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