Pneumatic single-seat control valve
A valve is a mechanical device that controls the flow rate, flow direction, pressure, temperature, etc. of a flowing fluid medium. Valves are the basic components in piping systems. Valve fittings, like pumps in technology, are often discussed as a separate category.
Key words:
Classification:
Control valve
Description
A valve is a mechanical device that controls the flow rate, flow direction, pressure, temperature, etc. of a flowing fluid medium. Valves are the basic components in piping systems. Valve fittings, like pumps in technology, are often discussed as a separate category. The valve may be operated manually or with a hand wheel, handle or pedal, and may also be controlled to vary the pressure, temperature and flow rate of the fluid medium. The valve can perform continuous or repeated operations on these changes, such as safety valves installed in hot water systems or steam boilers. In more complex control systems, automatic control valves are used as required by external inputs (I. e., to adjust the changing set point of the flow through the pipeline). The automatic control valve does not need to be manually operated according to its input and setting, so that the valve can accurately control the various requirements of the fluid medium. Valves can also be divided into cast iron valves, cast steel valves, stainless steel valves, chromium molybdenum steel valves, chromium molybdenum vanadium steel valves, dual phase steel valves, plastic valves, non-standard customized valve materials, etc.
Product Features and Applications
The ZJHP pneumatic single-seat control valve consists of a pneumatic diaphragm multi-spring actuator and a low‑flow‑resistance straight‑through single‑seat regulating mechanism. The valve body features a straight‑through, single‑seat design with an upper guide and no bottom cover, while the valve plug adopts a plunger‑type structure. Compared with conventional single‑seat valves, it offers a compact footprint, light weight, and high flow capacity. It is ideally suited for applications requiring large flow rates and stringent leakage‑tightness requirements.
Valve Body Technical Parameters
| Nominal diameter mm | 20 | 25 | 40 | 50 | 65 | 80 | 100 | 150 | 200 | ||||||
| Valve seat diameter mm | 10 | 12 | 15 | 20 | 25 | 32 | 40 | 50 | 65 | 80 | 100 | 125 | 150 | 200 | |
| Rated flow coefficient Kv | Straight line | 1.8 | 2.8 | 4.4 | 6.9 | 11 | 17.6 | 27.5 | 44 | 69 | 110 | 176 | 275 | 440 | 690 |
| Percentage of waiting | 1.6 | 2.5 | 4 | 6.3 | 10 | 16 | 25 | 40 | 63 | 100 | 160 | 250 | 400 | 630 | |
| Nominal pressure MPa | 1.6, 2.5, 4.0, 6.3 | ||||||||||||||
| Itinerary mm | 16 | 25 | 40 | 60 | |||||||||||
| Flow characteristics | Straight line; equal percentage | ||||||||||||||
| Medium temperature ℃ | -20~200 (ambient‑temperature type), -40~450 (medium‑temperature type), -196~46 (low‑temperature type) | ||||||||||||||
| Flange dimensions and types | PN16 according to JB/T79.1; PN40 and PN63 according to JB/T79.2 | ||||||||||||||
| Valve body material | PN 1.6/2.5 | WCB, WCC, WC6, LCB, CF8, CF8M, CF3, CF3M | |||||||||||||
| PN 4.0/6.3 | WCB, WCC, WC6, LCB, CF8, CF8M, CF3, CF3M | ||||||||||||||
| Valve core material | 304, 316, 304L, 316L | ||||||||||||||
| Upper Bonnet Type | Standard type (room-temperature), heated‑plate type (medium‑temperature), and expansion type (low‑temperature) | ||||||||||||||
| Adjustable ratio | 50:01:00 | ||||||||||||||
Note: Flange configurations compliant with GB, ANSI, JPI, JIS, DIN, and other standards are available; flange center-to-center distances can be customized to meet customer requirements.
Actuator Technical Parameters
| Model number | ZHA(B)– 22 | ZHA(B)–23 | ZHA(B)– 34 | ZHA(B)–45 |
| Effective membrane area cm² | 350 | 350 | 560 | 900 |
| Itinerary mm | 16 | 25 | 40 | 60 |
| Spring range kPa | 20~100, 40~200, 80~240, 20~60, 60~100 | |||
Main External Connection Dimensions Unit: mm
| Nominal diameter | L | H | H1 | H2 | Hn | Dn | D | ||||||||||
| PN 16 | PN 25 | PN 40 | PN 63 | Low-temperature elongation type | Standard model | Heat-dissipating type; bellows type | PN 16 | PN 25 | PN 40 | PN 63 | Executing agency | Low-temperature elongation type | Low-temperature elongation type | Executing agency | |||
| ANSI 150 | ANSI 300 | ANSI 600 | -196~ -100℃ | -196~ -40℃ | ANSI 150 | ANSI 300 | ANSI 600 | -196~ -100℃ | -196~ -40℃ | ||||||||
| 20 | 194 | 194 | 194 | 206 | 1175 | 975 | 400 | 550 | 52.5 | 52.5 | 52.5 | 70 | 300 | 700 | 500 | 275 | 285 |
| 25 | 197 | 197 | 197 | 210 | 1195 | 995 | 420 | 570 | 57.5 | 57.5 | 57.5 | 80 | 300 | 700 | 500 | 290 | 285 |
| 40 | 235 | 235 | 235 | 251 | 1246 | 1046 | 460 | 630 | 72.5 | 72.5 | 72.5 | 95 | 300 | 700 | 500 | 340 | 285 |
| 50 | 267 | 267 | 267 | 286 | 1276 | 1076 | 465 | 650 | 80 | 80 | 80 | 110 | 300 | 700 | 500 | 370 | 285 |
| 65 | 292 | 292 | 292 | 311 | 1490 | 1290 | 620 | 800 | 90 | 90 | 90 | 125 | 390 | 800 | 600 | 410 | 360 |
| 80 | 317 | 317 | 317 | 337 | 1504 | 1304 | 635 | 810 | 97.5 | 97.5 | 97.5 | 135 | 390 | 800 | 600 | 440 | 360 |
| 100 | 368 | 368 | 368 | 394 | 1520 | 1320 | 640 | 820 | 108 | 115 | 115 | 150 | 390 | 800 | 600 | 500 | 360 |
| 125 | 410 | 410 | 410 | 460 | 1620 | 1420 | 840 | 1020 | 125 | 140 | 140 | 180 | 640 | 900 | 700 | 650 | 470 |
| 150 | 520 | 520 | 520 | 520 | 1640 | 1440 | 860 | 1040 | 140 | 150 | 150 | 200 | 640 | 900 | 700 | 650 | 470 |
| 200 | 635 | 650 | 650 | 650 | 1824 | 1624 | 784 | 1220 | 168 | 188 | 188 | 230 | 640 | 900 | 700 | 760 | 470 |
Note: We can supply flanges conforming to ANSI, JPI, JIS, and HG standards.
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