LDZD series pneumatic diaphragm piston cut-off valve
| Product Features | Valve body parameters |
| Superior structure: Balanced valve internals, improving the allowable pressure differential sealing of the cut-off valve. Good sealing performance: can choose tight seal or soft seal. The bellows sealing type forms a complete seal for the moving valve stem, blocking the possibility of medium leakage. The external structure: the entire height can be reduced by about 30%, and the weight can be reduced by about 30%. The piston type actuator has high operating force and large pressure difference when used | Nominal pressure PN10, PN16, PN40, PN64 |
| Connection method: flange type, (special: welding type) | |
| Valve body materials HT200, ZG230-450, ZG1Cr18Ni9Ti, ZG1Cr18Ni12MO2Ti | |
| Valve core materials: 1Cr18Ni9T, OCr18Ni12MO2Ti, 1Cr18Ni9Ti, and Steyr welding | |
| Sealing material PTFE, hard seal, special high-temperature material | |
| Technical Parameters | Corrugated pipe 1Cr18Ni9Ti |
| Action mode: air open, air closed | Packing PTFE, flexible graphite |
| Valve seat structure M sleeve P single seat N double seat | Push rod liner 2Cr13, 1Cr18Ni9Ti |
| Signal range 2 bar | Gasket rubber asbestos board, 1Cr18Ni9Ti asbestos wrapped gasket |
| Sealing grade III, IV, V, VI | Flange standards GB9113-88, JB/T79-94, GB2555-81 |
| Environmental temperature -30 ℃~+70 ℃ (see locator parameters for explosion-proof type) | Fluid temperature -60-450 ℃ |
| Main technical parameters and performance indicators | |||||||||||||
| Nominal diameter DN (mm) | 15 | 20 | 25 | 32 | 40 | 50 | 65 | 80 | 100 | 125 | 150 | 200 | |
| Rated flow coefficient Kv | Single seat, double seat | 5 | 7 | 11 | 20 | 30 | 48 | 75 | 120 | 190 | 300 | 480 | 760 |
| Sleeve | 11 | 20 | 30 | 48 | 75 | 120 | 190 | 300 | 480 | 760 | |||
| Nominal pressure PN (MPa) | 1.0 1.6 4.0 6.4 | ||||||||||||
| Rated stroke (mm) | 8 | 12 | 20 | 25 | 40 | 50 | |||||||
| Effective area C ㎡ | LDZD type | 100 | 200 | 400 | 600 | 1000 | |||||||
| LDZS type | 100 | 125 | 160 | 250 | |||||||||
| Allowable leakage | Hard seal 1/h | Generally: 10-4 times the rated capacity of the valve; Tight type: single and double seat: 1.2 × 10 ᯝ 7, sleeve 5 × 10 ᯝ 6 × valve customer fixed capacity | |||||||||||
| Soft seal | VI级 | ||||||||||||
| Allow pressure difference | LDZD1 positive effect | 6.4 | 5.09 | 2.91 | 1.85 | 2.18 | 1.33 | 1.52 | 0.99 | 0.62 | 0.6 | 0.69 | 0.39 |
| LDZD1 reaction | 6.4 | 6.4 | 3.88 | 2.47 | 2.91 | 1.77 | 2.03 | 1.32 | 0.83 | 0.8 | 0.92 | 0.52 | |
| （MPa） | LDQD2 | 6.4 | 6.1 | 3.5 | 2.3 | 3 | 1.9 | 1.9 | 1.5 | 0.93 | 0.84 | 0.65 | 0.47 |
1) The performance and indicators of this product comply with GB/T4213-92;
2) If the allowable pressure difference in the table is greater than the nominal pressure, the nominal pressure value shall be taken, and if it is less than or equal to the nominal pressure value, it shall remain unchanged;
3) The allowable values in the table are based on standard cylinder values, and different cylinders can be used to increase the allowable pressure difference.
| Dimensions and Weight Table Unit: mm | |||||||||||||
| Nominal diameter | 15 | 20 | 25 | 32 | 40 | 50 | 65 | 80 | 100 | 125 | 150 | 200 | |
| A | Φ196 | Φ232 | Φ308 | Φ394 | Φ498 | ||||||||
| L | PN16、40 | 130 | 150 | 160 | 180 | 200 | 230 | 290 | 310 | 350 | 400 | 480 | 600 |
| PN64 | 210 | 230 | 230 | 260 | 260 | 300 | 340 | 380 | 430 | 500 | 550 | 650 | |
| H | PN16、40 | 305 | 340 | 345 | 370 | 380 | 390 | 475 | 490 | 500 | 765 | 825 | 927 |
| PN64 | 320 | 350 | 354 | 372 | 382 | 397 | 473 | 475 | 517 | 805 | 882 | 815 | |
| Bellows sealed type | 375 | 409 | 414 | 431 | 441 | 468 | 555 | 570 | 613 | 855 | 915 | 1017 | |
| H1 | PN16、40 | 50 | 53 | 58 | 70 | 75 | 83 | 93 | 100 | 110 | 125 | 143 | 170 |
| PN64 | 60 | 65 | 70 | 77.5 | 85 | 90 | 100 | 85 | 125 | 148 | 170 | 208 | |
| H2 | PN16 | 115 | 115 | 121 | 130 | 140 | 153 | 178 | 190 | 200 | 260 | 320 | 360 |
| PN40 | 125 | 125 | 130 | 140 | 150 | 160 | 185 | 200 | 220 | 280 | 320 | 380 | |
| PN64 | 150 | 150 | 160 | 170 | 180 | 200 | 230 | 250 | 282 | 310 | 430 | 480 | |
| H3 | PN16、PN40 | 404 | 415 | 428 | 448 | 448 | 468 | 561 | 578 | 590 | 886 | 1008 | 1120 |
| PN64 | 365 | 430 | 498 | 528 | 528 | 530 | 535 | 540 | 600 | 890 | 1208 | 1305 | |
| Bellows sealed type | 395 | 465 | 478 | 509 | 509 | 548 | 641 | 658 | 670 | 976 | 1098 | 1210 | |
| Weight kg | standard form | 10 | 10 | 12 | 15 | 18 | 23 | 35 | 45 | 60 | 75 | 90 | 120 |
| Bellows sealed type | 12 | 12 | 14 | 17 | 20 | 26 | 38 | 48 | 64 | 79 | 95 | 125 | |
Note:
*Flange sealing surface type: PN10 and PN16 are convex surfaces, PN40 and PN64 are concave and convex surfaces, and the valve body is concave
*Structural length: According to GB12221-89 standard
*Execution mechanism gas signal interface: internal thread M10 * 1
*The valve body flange and flange end face distance can be manufactured according to user specified standards, such as ANSI, JIS, DIN, etc.
*We respect your confidentiality and all information are protected.
I’m Leo, the head of sales team at Huaxiang. Me and my team would be happy to meet you and learn all about your business, requirements and expectations.
*We respect your confidentiality and all information are protected.
I’m Leo, the head of sales team at Huaxiang. Me and my team would be happy to meet you and learn all about your business, requirements and expectations.
