pneumatic v-type adjusting flange ball valve
nominal pressure: 1.6mpa-6.4mpa
temperature: -28 ℃ ~ 500 ℃
connection: clip-on, flange
body material: wcb, zg1cr18ni9ti, zg0cr18ni12mo2ti
suitable medium: water, steam, oil products, nitric acid, acetic acid
a. at pneumatic v-type adjusting flange ball valve introduction
at pneumatic v-type adjusting flange ball valve pneumatic actuator adopts the new at/gt series pneumatic actuator. its structure has obtained the national utility model patent, with double action and single acting type (spring reset ), the use of rack and pinion structure transmission, the performance is more safe and reliable; large-diameter valves using aw series of pneumatic actuators, fork-type transmission structure, reasonable structure, large output torque.
at pneumatic v-type adjusting flange ball valve is divided into soft seal and hard seal according to the sealing performance; it is divided into regulation type and cut-off type according to the adjustment mode, and the cut-off type is divided into single action and double action type according to the action mode, and the adjustment type is double action type. the unique advantage of the single-acting type is that once the power source fails, the ball valve will automatically be in the closed or open position as required by the control system.
two, at pneumatic v-regulating flange ball valve working principle
at pneumatic v-ball valve has a special shape of the fixed v-notch ball and adjustable metal seat structure, when the valve is closed, the v-shaped incision and the valve seat to form a wedge cut function, can prevent the jam between the ball and the valve seat caused by the phenomenon of dirt, with self-clearing function, especially suitable for media containing fiber slurry, sewage and sticky particles, with a valve positioner can achieve continuous adjustment, and with a small flow resistance, a wide range of adjustment, is a wide range of high-quality control valve.
iii. main technical parameters of at pneumatic v-type flange ball valve
1. body
| body form | straight through ball valve |
| nominal diameter | dn25～400mm |
| nominal pressure | pn1.6, 2.5, 4.0, 6.4 mpa |
| flange standard | gb, jb, hg, ansi, jis, etc. |
| connection type | clip type, flange type |
| valve cover form | integral type (applicable temperature -45～ 400°c) |
| capping type | bolt compression type |
| seal packing | v-type polytetrafluoroethylene filler, impregnated ptfe asbestos filler, asbestos textile filler, graphite filler |
2, valve trim
| spool form | ball valve with v-notch |
| flow characteristics |
approximate equal percentages (see flow characteristic diagram )
|
3, the executing agency
| actuator model | at/gt series pneumatic actuator |
| the main technical parameters |
supply pressure: 400~700kpa gas source interface: g1/8〞, g1/4〞, g1/2〞 |
| ambient temperature: -25 ~ 70 °c, ambient humidity: ≤ 95 | |
| accessories: locator, solenoid valve, air filter relief valve, position valve, travel switch, valve positioner, handwheel mechanism, etc. |
4、flow characteristics (intrinsic flow characteristic curve of v adjusting ball valve) iv. material list of main parts of at pneumatic v type adjusting flange ball valve
| material \ material code | c | p | r | |||
| the main parts | body | wcb | zg1cr18ni9ti | zg0cr18ni12mo2ti | ||
| ball board | 2cr13 | zg1cr18ni9ti | zg0cr18ni12mo2ti | |||
| stem | 2cr13 | 1cr18ni9ti | 0cr18ni12mo2ti | |||
| sealing ring | carbide | |||||
| filler | ptfe, soft graphite | |||||
| applicable conditions | suitable medium | water, steam, oil | nitric acid | acetic acid | ||
| proper temperature | -28°c～500°c | |||||
v. at pneumatic v-type flange ball valve product performance index
| nominal diameter d (mm) | 25 | 32 | 40 | 50 | 65 | 80 | 100 | 125 | 150 | 200 | 250 | 300 | |||||
| rated flow coefficient cv | 32 | 47 | 78 | 110 | 170 | 280 | 410 | 750 | 1120 | 1850 | 2950 | 3800 | |||||
| nominal pressure pn (mpa) | 1.6, 2.5, 4.0, 6.4 | ||||||||||||||||
| flow characteristics | approximate equal percentages (see typical graphs), straight line characteristics, quick opening properties | ||||||||||||||||
| valve plate angle (degrees) | 0°～90°(adjustable) | ||||||||||||||||
| allowed leakage level | soft seal: zero leakage hard seal: ≤10--5 rated flow coefficient | ||||||||||||||||
| form of action | double action / single action (spring return type) | ||||||||||||||||
| control type | cut-off/adjustment type | ||||||||||||||||
| actuator | model number | at series, gt series, aw series, zsq series, etc. | |||||||||||||||
| air pressure | purified compressed air (nitrogen) 0.3-0.7mpa | ||||||||||||||||
| adjustable | input signal | current signal: 0～10ma, 4～10ma air source signal 20～100kpa | |||||||||||||||
| basic error | with locator ≤±1.5% | ||||||||||||||||
| backward | with locator ≤ 1.5% | ||||||||||||||||
| dead zone | with positioner ≤0.6% | ||||||||||||||||
| adjustable ratio | 250:1 | 300:1 | |||||||||||||||
| cut-off type | recall voltage | ac220v, ac110v, dc24v, | |||||||||||||||
| cut off time | 0.5 s | 1.0 s | 2.5 to 4.0 s | 7.0 s | |||||||||||||
| pn(mpa) | dn(mm) | size (mm) | ||||||||
| l | clip connection | flange connection | h | |||||||
| d | d | d1 | d2 | d6 | b | zd | ||||
| 1.6 | 25 | 102 | 64 | 115 | 85 | 5 | - | 14/16 | 4-14 | 233 |
| 40 | 114 | 82 | 145/150 | 110 | 85/84 | - | 16/18 | 4-18 | 280 | |
| 50 | 124 | 100 | 160/165 | 125 | 100/99 | - | 16/20 | 4-18 | 362 | |
| 65 | 145 | 118 | 180/185 | 145 | 120/188 | - | 18/20 | 4-18 | 377 | |
| 80 | 165 | 130 | 195/200 | 160 | 135/132 | - | 20 | 8-18 | 410 | |
| 100 | 194 | 155 | 215/220 | 180 | 155/150 | - | 20/22 | 8-18 | 423 | |
| 125 | 210 | 185 | 245/250 | 210 | 185/184 | - | 22 | 8-18 | 436 | |
| 150 | 229 | 216 | 280/285 | 240 | 210/211 | - | 24 | 8-23/8-22 | 653 | |
| 200 | 243 | 264 | 335/340 | 295 | 265/266 | - | 26/24 | 12-23/12-22 | 703 | |
| 250 | 297 | 328 | 405 | 355 | 320/319 | - | 30/26 | 12-25/12-26 | 787 | |
| 300 | 338 | 373 | 460 | 410 | 375/370 | - | 30/28 | 12-25/12-26 | 827 | |
| 2.5 | 25 | 102 | 64 | 115 | 85 | 65 | - | 16 | 4-14 | 233 |
| 40 | 114 | 82 | 145/150 | 110 | 85/84 | - | 18 | 4-18 | 280 | |
| 50 | 124 | 100 | 160/165 | 125 | 100/99 | - | 20 | 4-18 | 362 | |
| 65 | 145 | 118 | 160/185 | 145 | 120/118 | - | 22 | 8-18 | 377 | |
| 80 | 165 | 130 | 195/200 | 160 | 135/132 | - | 22-24 | 8-18 | 410 | |
| 100 | 194 | 155 | 230/235 | 190 | 160/156 | - | 24 | 8-23/8-22 | 423 | |
| 125 | 210 | 185 | 270 | 220 | 188/184 | - | 28/26 | 8-25/8-26 | 436 | |
| 150 | 229 | 216 | 300 | 250 | 218/211 | - | 30/28 | 8-25/12-26 | 653 | |
| 200 | 243 | 264 | 360 | 310 | 278/274 | - | 34/30 | 12-25/12-26 | 703 | |
| 250 | 297 | 328 | 425 | 370 | 332/330 | - | 36/32 | 12-30 | 787 | |
| 300 | 338 | 373 | 485 | 430 | 390/389 | - | 40/34 | 16-30 | 827 | |