The Pneumatic Three-Way Control Valve is a high-performance industrial control valve designed for fluid mixing, flow diverting and process switching applications. Featuring a sleeve-guided pressure-unbalanced trim, it provides accurate flow regulation, stable operation and excellent durability in demanding industrial systems.
Available in both three-way mixing valve and three-way diverting valve configurations, this valve is widely used for controlling steam, water, gas and process fluids in applications requiring efficient flow distribution or combination.
Two Operating Modes and Working Principles of Pneumatic Three-Way Control Valve
Three-Way Mixing Control Valve：The Three-Way Mixing Control Valve is the most commonly used configuration for mixing hot and cold fluids to achieve precise and stable temperature control. It features two inlet ports and one outlet port. For example, hot water and cold water can be continuously mixed at a controlled ratio to maintain a constant outlet temperature. With a standard 4–20 mA control signal, a 4 mA signal fully opens Flow Path A and closes Flow Path B; a 12 mA signal positions both flow paths at approximately equal openings for balanced mixing; and a 20 mA signal closes Flow Path A and fully opens Flow Path B. As the valve position changes continuously, the mixing ratio of the two fluid streams can be precisely adjusted, ensuring stable outlet temperature control. Typical applications include heating and heat exchange systems, hot water units, HVAC systems, and industrial process circulating water temperature control.
Three-Way Diverting Control Valve：The Three-Way Diverting Control Valve is designed to divide one process fluid stream into two separate flow paths. It features one inlet port and two outlet ports. For example, high-temperature hot water enters through the main inlet, with one outlet directing flow through a heat exchanger while the other outlet routes flow through a bypass line. By continuously adjusting the bypass flow rate, the valve regulates heat exchanger load, heat transfer capacity, and process temperature. It is important to note that three-way diverting valves and three-way mixing valves have different pressure ratings, allowable differential pressure characteristics, internal trim configurations, and flow arrangements. Therefore, the two valve types are designed for different service conditions and should not be interchanged or used as direct substitutes.
Control valves are used for precise regulation of pipeline flow, pressure, temperature and other process parameters. To ensure correct valve selection and optimal performance, please provide detailed technical data before placing an order. Non-standard sizes and customized designs can be manufactured according to customer requirements.（Unit: mm）
Pneumatic Three-way Regulating Valve 150LB-600LB
DN NPS TypeTBDClass Part No L H H2 MIX（H3） DIV(H3) D K d1 n-L A Plug size Rated CV Storke
20 0.75 XSTJHPBZ-150LB XLXSR150ST075 180 165 462 138 TBD 100 69.9 42.9 4-16 290 20.0 6.3 10.0
25 1 XSTJHPBZ-150LB XLXSR150ST1 185 180 477 150 150 110 79 51 4-16 290 25.0 8.5 16.0
32 1.25 XSTJHPBZ-150LB XLXSR150ST125 200 185 511 160 160 115 89 64 4-16 290 32.0 13.0 16.0
40 1.5 XSTJHPBZ-150LB XLXSR150ST15 220 200 526 165 165 125 98 73 4-16 290 40.0 21.0 25.0
50 2 XSTJHPBZ-150LB XLXSR150ST2 250 205 531 180 180 150 121 92 4-18 290 50.0 34.0 25.0
65 2.5 XSTJHPBZ-150LB XLXSR150ST25 275 270 687 200 200 180 140 105 4-18 365 65.0 52.0 40.0
80 3 XSTJHPBZ-150LB XLXSR150ST3 300 280 697 220 237 190 152 127 4-18 365 80.0 85.0 40.0
100 4 XSTJHPBZ-150LB XLXSR150ST4 350 295 712 230 260 230 191 157 8-18 365 100.0 135.0 40.0
125 5 XSTJHPBZ-150LB XLXSR150ST5 410 345 870 270 298 255 216 186 8-22 470 125.0 210.0 60.0
150 6 XSTJHPBZ-150LB XLXSR150ST6 450 355 880 295 320 280 241 216 8-22 470 150.0 340.0 60.0
200 8 XSTJHPBZ-150LB XLXSR150ST8 550 395 920 360 390 345 299 270 8-22 470 200.0 535.0 60.0
250 10 XSTJHPBZ-150LB XLXSR150ST10 650 510 1241 400 465 405 362 324 12-26 597 250.0 800.0 100.0
300 12 XSTJHPBZ-150LB XLXSR150ST12 740 560 1291 480 548 485 432 381 12-26 597 300.0 1260.0 100.0
20 0.75 XSTJHPBZ-300LB XLXSR300ST075 180 165 462 138 TBD 115 83 43 4-18 290 20.0 6.3 10.0
25 1 XSTJHPBZ-300LB XLXSR300ST1 185 180 477 150 150 125 89 51 4-18 290 25.0 8.5 16.0
32 1.25 XSTJHPBZ-300LB XLXSR300ST125 200 185 511 160 160 135 98 64 4-18 290 32.0 13.0 16.0
40 1.5 XSTJHPBZ-300LB XLXSR300ST15 220 200 526 165 165 155 114 73 4-22 290 40.0 21.0 25.0
50 2 XSTJHPBZ-300LB XLXSR300ST2 250 205 531 180 180 165 127 92 8-18 290 50.0 34.0 25.0
65 2.5 XSTJHPBZ-300LB XLXSR300ST25 275 270 687 200 200 190 149 105 8-22 365 65.0 52.0 40.0
80 3 XSTJHPBZ-300LB XLXSR300ST3 310 280 697 220 237 210 168 127 8-22 365 80.0 85.0 40.0
100 4 XSTJHPBZ-300LB XLXSR300ST4 355 295 712 230 260 255 200 157 8-22 365 100.0 135.0 40.0
125 5 XSTJHPBZ-300LB XLXSR300ST5 425 345 870 270 298 280 235 186 8-22 470 125.0 210.0 60.0
150 6 XSTJHPBZ-300LB XLXSR300ST6 460 355 880 295 320 320 270 216 12-22 470 150.0 340.0 60.0
200 8 XSTJHPBZ-300LB XLXSR300ST8 560 395 920 360 390 380 330 270 12-26 470 200.0 535.0 60.0
250 10 XSTJHPBZ-300LB XLXSR300ST10 660 510 1241 400 465 445 387 324 16-30 597 250.0 800.0 100.0
300 12 XSTJHPBZ-300LB XLXSR300ST12 785 560 1291 480 548 520 451 381 16-33 597 300.0 1260.0 100.0
20 0.75 XSTJHPBZ-600LB XLXSR600ST075 190 165 462 TBD TBD 115 83 43 4-18 290 20.0 6.3 10.0
25 1 XSTJHPBZ-600LB XLXSR600ST1 200 180 477 160 160 125 89 51 4-18 290 25.0 8.5 16.0
32 1.25 XSTJHPBZ-600LB XLXSR600ST125 210 185 511 170 170 135 98 64 4-18 290 32.0 13.0 16.0
40 1.5 XSTJHPBZ-600LB XLXSR600ST15 235 200 526 175 185 155 114 73 4-22 290 40.0 21.0 25.0
50 2 XSTJHPBZ-600LB XLXSR600ST2 265 205 531 190 190 165 127 92 8-18 290 50.0 34.0 25.0
65 2.5 XSTJHPBZ-600LB XLXSR600ST25 295 270 687 210 228 190 149 105 8-22 365 65.0 52.0 40.0
80 3 XSTJHPBZ-600LB XLXSR600ST3 320 280 697 230 247 210 168 127 8-22 365 80.0 85.0 40.0
100 4 XSTJHPBZ-600LB XLXSR600ST4 370 295 712 240 270 275 216 157 8-26 365 100.0 135.0 40.0
125 5 XSTJHPBZ-600LB XLXSR600ST5 440 345 870 295 323 330 267 186 8-30 470 125.0 210.0 60.0
150 6 XSTJHPBZ-600LB XLXSR600ST6 470 355 880 315 340 355 292 216 12-30 470 150.0 340.0 60.0
200 8 XSTJHPBZ-600LB XLXSR600ST8 570 395 920 380 410 420 349 270 12-33 470 200.0 535.0 60.0
250 10 XSTJHPBZ-600LB XLXSR600ST10 670 510 1241 420 485 510 432 324 16-36 597 250.0 800.0 100.0
300 12 XSTJHPBZ-600LB XLXSR600ST12 800 560 1291 510 578 560 489 381 20-36 597 300.0 1260.0 100.0
Precise Mixing and Splitting Control: This valve can accurately regulate the mixing ratio of two fluids or flow distribution, so as to achieve stable regulation of temperature, flow rate and other process parameters.
Stable and Reliable Operation: The sleeve-guided valve structure delivers superior guiding performance, reduces vibration and enhances operational stability, especially under continuous modulating service conditions.
High Flow Regulation Accuracy: Combined with the pneumatic actuator and valve positioner, precise control is realized via the 4–20 mA signal, ensuring smooth modulation and accurate process control.
Excellent Pressure Balancing Performance: The pressure-balanced trim ensures dependable operation under varying pressure conditions, with strong resistance to flow impact and wear.
