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 ZHEJIANG KINGSIR VALVE CO., LTD. , https://www.kingsirvalve.com
May 7 Lecong Steel Market Price Quotes
Product name Specification Material Steel / Origin Price (yuan/ton) Than yesterday Last week, compared with last month HRC 2.75mm*1250*C Q235 Handan Steel 6050 0 220 370 Hot Roll 3.0mm*1500*C Q235 Tangang 5950 0 270 370 Hot rolled coil 3.0mm*1250*C Q235 Angang 5950 0 270 320 Hot rolled coil 3.5mm*1250*C Q235 Angang 5950 0 290 530 Hot rolled coil 2.0mm*1250*C ZJ400 Bead steel 6300 0 170 400 Hot Rolls 3.2mm*1250*C ZJ400 Steel 6050 0 390 630 Hot Roll 5.75*1500*C Q235 Tangsteel 5880 30 330 460 Hot Roll 5.75*1500*C Q235 Handan Steel 5880 30 330 460 Hot Roll 5.75* 1500*C Q235 Benxi Steel 5880 30 330 460 Cold rolled sheet 1.0mm*1000*2000 Q195 Angang 7050 50 450 500 Cold rolled sheet 1.0mm*1250*2500 Q195 Angang 6980 30 380 430 Cold rolled sheet 2.0mm*1250*2500 Q195 Angang 6950 0 350 400 Cold rolled plate 3.0mm*1250*2500 Q195 Angang 7200 100 530 650 Cold rolled coil 1.0mm*1250*Cmm Q195 Masteel 6850 20 350 450 Cold rolled coil 1.0mm*1250*Cmm Q195 Baotou 6850 20 350 450 Cold rolled coil 1.0mm*1250*Cmm Q195 Cold rolled steel 6850 20 350 450 Medium plate 6mm Q235 New steel 7150 30 230 510 Medium plate 8mm Q235 New steel 7100 50 250 530 Medium plate 10mm Q235 New steel 6800 50 250 530 Pu Plate 14-20mm Q235 New Steel 6650 50 250 530 Puzhong Plate 10mm Q345 Handan Steel 6800 50 250 530 Medium Plate 12mm Q345 Handan Steel 6700 50 250 530 Puzhong Plate 16-25mm Q345 Handan Steel 6650 50 250 530 Strip 154mm* 2.5 Q195 Guofeng 5900 0 470 720 Strip 235mm*2.5 Q195 Ruifeng 5900 0 470 720 Strip 178mm*2.3 Q195 Guofeng 5900 0 500 720 Strip 232mm*2.5 Q195 Jianlong 5900 0 470 720 Beam 16# Q235 A steel 5430 0 130 230 I-beam 25# Q235 Angang 5570 0 90 320 Channel 16# Q235 Liusteel 5540 0 140 240 Channel 28# Q235 Angang 5450 0 150 150 40*4mm Q235/Shougang 5640 0 100 140 Angle Steel 50*5mm Q235 Nanchang 5570 0 90 170 Color Coil 0.426*1000*C CGCC Hua Guan 0 0 0 Color Coil 0.426*1000*C SGCC Shun Pu 8100 0 0 0 Color Coil 0.476*1000*C SGCC Shun Pu 7950 0 0 0 Galvanized coil 0.5*1000*C SGCC Panzhihua steel 6950 0 0 170 Galvanized coil 0.6*1000*C SGCC Steel 6800 0 0 120 Galvanized coil 0.7mm*1000*C SGCC Angang 6700 0 0 100 Plating Zinc coil 1.0mm*1000*C SGCC Angang 6550 0 0 50