Single Row Cylindrical Roller Bearing Cylindrical Roller Bearing,Single Row Cylindrical Roller Bearing,Sealed Cylindrical Roller Bearings LUOYANG AUTO BEARING CO.,LTD , https://www.ballbearing.nl
Control valve product classification
According to purpose and function classification a. Two valves: mainly used to close or connect the media; b. Regulating valve: mainly used to adjust the system. Valve selection, the need to determine the flow characteristics of the control valve; c. Shunt valve: for the distribution or mixing medium; d. Shut-off valve: usually refers to the leakage rate of less than one hundred thousandth of the valve. (1) Vacuum valve: Working pressure is lower than standard atmospheric pressure; (2) Low pressure valve: Nominal pressure PN≤1.6MPa; (3) Medium pressure valve: PN2.5 ~ 6.4MPa; (4) ) High pressure valve: PNl0.0 ~ 80. OMPa, usually PN22, PN32; (5) ultra-high pressure valve: PN ≥ IOOMPa. (2) Medium temperature valve: 220 ℃ ≤ t ≤ 450 ℃; (3) Room temperature valve: -40 ℃ ≤ t ≤ 220 ℃; (4) Low temperature Valve: -200 ℃ ≤ t ≤ -40 ℃. According to common customs classification This classification method according to the principle, the role and structure by division, is the most commonly used classification methods at home and abroad. Generally divided into nine categories: (1) single-seat control valve; (2) two-seat control valve; (3) Sleeve control valve; (4) angle control valve; Diaphragm valve (7) Butterfly valve (8) Ball valve (9) Eccentric rotary valve. The first six kinds of straight stroke, the latter three kinds of angular travel. These nine products are also the most basic products, also known as general products, base products or standard products. A variety of special products, special products are improved on the basis of these nine products out of shape. According to the main special points (that is, special, dedicated valve) (1) soft seal shut-off valve; (2) hard seal shut-off valve; (3) wear control valve; Corrosion-resistant control valve (6) Corrosion-resistant alloy valve; (7) emergency action cut off or vent valve; (8) anti-blocking control valve; (11) large pressure drop cut-off valve (12) small flow control valve (13) large diameter control valve (14) large adjustable ratio control valve (15) low S energy saving control valve (16) Valve; (17) small regulating valve; (18) lining (rubber, PTFE, ceramic) control valve; (19) special ball valve for water treatment; (20) caustic soda valve; ) Chlorine valve; (23) bellows seal valve ... ... by driving energy points (1) pneumatic control valve; (2) electric control valve; (3) hydraulic control valve.