Tunable Pressure-reducing-and-maintaining Valve
manufacturer: Shanghai MeiYan Yi Pump & Valve Co., Ltd.
Eml: sales@1bengfa.com
Tel: +86 (21) 5640 2009
Mob: +86 138 1691 3072（WeChat Same Account）
product drawing
Tunable pressure-reducing-and-maintaining valves
Structural Features
YX741X tunable pressure-reducing-and-maintaining valve consists of main valve, needle regulating valve, pilot valve, ball valve and taking over system. The body of the main valve adopts all channels, straight-flow type, streamline design, and two kinds of structure as the diaphragm and piston type. This product make use of setting spring pressure of the pressure regulating pilot valve and adjusting needle valve opening to setting ther outlet pressure, and stabilize the outlet pressure by the feedback of the takeover systems and the control chamber.
This product using needle regulating valves and pilot valve to self-reliance control of water-pressure, does not need additional devices and energy, and easy to maintain, small influence by inlet pressure and flow. pressure control accuracy is high, pressure-reducing-and-maintaining is reliable.
Working Principle
When water go in from water pipe, water flowed into the main valve control chamber by needle valve,outlet pressure impact on the pilot valve by catheter, when the outlet pressure is higher than pilot valve setting valve,pilot valve closed, and control chamber stop drainage, then the presure of the control chamber of the main valve rise and close the main valve, so the outlet pressure will no longer rise.
When the pilot valve outlet pressure reduces to the setting value, the valve opens, the control chamber downstream drainage. Because of the displacement of the pilot valve is more than the inflow of the needle valve, the pressure of the main valve control chamber drops, the main valve opens by the inlet pressure. Under stable condition, the control chamber bilging, same displacement and unchanged opening cause the outlet pressure constant.
Adjust the spring of the pilot valve can set the outlet pressure.
Working Features
1, pressure control is stable and reliable. Pilot valve and the main valve work continuously, downstream pressure changes continuously and stably, the inlet pressure effect is small.
2 Convenient operation. After adjustment for working pressure, when the upstream pressure or flow changes, the main valve automatically adjust, stabilize the downstream pressure.
3 The body adopts the whole passage, straight-flow and streamline design. Hydraulic losses is small, energy-saving effect is good.
Dimensions & constructral diagram
Tunable pressure-reducing-and-maintaining valve constructral diagram
1、Pressure gaugege2、Pilot Valve3、Filter4、Flow regulating valve 5、Main Valve
Main technical parameter
| nominal pressure(Mpa) | test pressure of casing body (MPa) | sealing test pressure (MPa) | pressure-adjustable range(MPa) | applicable medium | medium temperature (℃) |
| 1.0 | 1.5 | 1.1 | 0.09-0.8 | 水water | 0-80 |
| 1.6 | 2.4 | 1.76 | 0.15-1.4 | ||
| 2.5 | 3.75 | 2.75 | 0.2-2.0 |
Material of main parts
| name of parts | material of parts |
| body and bonnet | WCB |
| valve seat and disk | copper alloy /2Cr13 |
| sealing ring O-shaped ring | NBR |
| valve rod | 2Cr13 |
| spring | 50CrVA |
| cylinder sleve piston (piston-type) | 2Cr13 |
| diaphragm(diaphragm-type) | knitting NBR |
| control valve ball-valve | copper alloy |
| filter | stainless steel |
Specification and dimensions
| DN | L | H | D mm | D1 mm | b mm | D2 mm | n-Φd | ||||||||||
| mm | mm | PN1.0 | PN1.6 | PN2.5 | PN1.0 | PN1.6 | PN2.5 | PN1.0 | PN1.6 | PN2.5 | PN1.0 | PN1.6 | PN2.5 | PN1.0 | PN1.6 | PN2.5 | |
| 40 | 240 | 270 | 150 | 150 | 150 | 110 | 110 | 110 | 18 | 18 | 18 | 88 | 88 | 84 | 4-17.5 | 4-17.5 | 4-18 |
| 50 | 240 | 270 | 165 | 165 | 165 | 125 | 125 | 125 | 20 | 20 | 20 | 102 | 102 | 99 | 4-17.5 | 4-17.5 | 4-18 |
| 65 | 270 | 340 | 185 | 185 | 185 | 145 | 145 | 145 | 20 | 20 | 22 | 122 | 122 | 118 | 4-17.5 | 4-17.5 | 8-18 |
| 80 | 300 | 400 | 200 | 200 | 200 | 160 | 160 | 160 | 22 | 22 | 24 | 133 | 133 | 132 | 8-17.5 | 8-17.5 | 8-18 |
| 100 | 350 | 440 | 220 | 220 | 235 | 180 | 180 | 190 | 24 | 24 | 24 | 158 | 158 | 156 | 8-17.5 | 8-17.5 | 8-22 |
| 125 | 400 | 460 | 250 | 250 | 270 | 210 | 210 | 220 | 26 | 26 | 26 | 184 | 184 | 184 | 8-17.5 | 8-17.5 | 8-26 |
| 150 | 480 | 500 | 285 | 285 | 300 | 240 | 240 | 250 | 26 | 26 | 28 | 212 | 212 | 211 | 8-22 | 8-22 | 8-26 |
| 200 | 500 | 640 | 340 | 340 | 360 | 295 | 295 | 310 | 28 | 30 | 30 | 268 | 268 | 274 | 8-22 | 12-22 | 12-26 |
| 250 | 605 | 690 | 395 | 405 | 425 | 350 | 355 | 370 | 28 | 32 | 32 | 320 | 320 | 330 | 12-22 | 12-26 | 12-30 |
| 300 | 700 | 820 | 445 | 460 | 485 | 400 | 410 | 430 | 28 | 32 | 34 | 370 | 370 | 389 | 12-22 | 12-26 | 16-30 |
| 350 | 800 | 950 | 505 | 520 | 555 | 460 | 470 | 490 | 30 | 36 | 38 | 430 | 430 | 448 | 16-22 | 16-26 | 16-33 |
| 400 | 900 | 1400 | 565 | 580 | 620 | 515 | 525 | 550 | 32 | 38 | 40 | 482 | 482 | 503 | 16-26 | 16-30 | 16-36 |
| 450 | 1000 | 1580 | 615 | 640 | 670 | 565 | 585 | 600 | 32 | 40 | 42 | 532 | 550 | 548 | 20-26 | 20-30 | 20-36 |
| 500 | 1100 | 1600 | 670 | 715 | 730 | 620 | 650 | 660 | 34 | 42 | 44 | 585 | 585 | 609 | 20-26 | 20-33 | 20-36 |
| 600 | 1300 | 1815 | 780 | 840 | 845 | 725 | 770 | 770 | 36 | 48 | 46 | 685 | 685 | 720 | 20-30 | 20-36 | 20-39 |
| 700 | 1400 | 2040 | 895 | 910 | 960 | 840 | 840 | 875 | 40 | 54 | 50 | 800 | 800 | 820 | 24-30 | 24-36 | 24-42 |
| 800 | 1500 | 2350 | 1015 | 1025 | 1085 | 950 | 950 | 990 | 44 | 58 | 54 | 905 | 905 | 925 | 24-33 | 24-39 | 24-48 |
| 900 | 1700 | 2606 | 1115 | 1125 | 1185 | 1050 | 1050 | 1090 | 46 | 62 | 58 | 1005 | 1005 | 1028 | 28-33 | 28-39 | 28-48 |
| 1000 | 1900 | 2765 | 1230 | 1255 | 1320 | 1160 | 1170 | 1210 | 50 | 66 | 62 | 1110 | 1110 | 1140 | 28-36 | 28-42 | 28-56 |
| 1200 | 2050 | 2950 | 1455 | 1485 | 1530 | 1380 | 1390 | 1420 | 56 | 52 | 70 | 1330 | 1328 | 1350 | 32-39 | 32-48 | 32-55 |
| 1400 | 2200 | 3180 | 1675 | 1685 | 1755 | 1590 | 1590 | 1640 | 62 | 58 | 76 | 1530 | 1530 | 1560 | 36-42 | 36-48 | 36-60 |
| 1600 | 2400 | 3400 | 1915 | 1930 | 1955 | 1820 | 1820 | 1860 | 68 | 64 | 84 | 1750 | 1750 | 1780 | 40-48 | 40-55 | 40-60 |
