Large Flow Pilot Piston High Sensitivity Steam Reducing 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
Large flow pilot piston high sensitivity steam reducing valves
Structural features and usages
This series reducing valve belongs to the pilot piston reducing valve, consisting of the main valve and the pilot valve. It is mainly composed by the seat, the main plate, piston, springs and other parts. Pilot valve is composed by the seat, disc, diaphragm, spring, regulative springs and other parts. This product improves greatly based on the general reducing valve, increases piston area, changes the structure of the throttle and the sealing form, increases the flow area, etc., so it has greatly improved the performance in sensitivity, flow rate, service life and other aspects.
This product is mainly used for steam pipes, suitable for large flow variation and large inlet pressure variation steam pipes.
Dimensions & constructral diagram
Large flow pilot piston high sensitivity steam reducing valve constructral diagram
The materials of main parts
| part name | the selection materials of YGa43H/YLarge flow pilot piston high sensitivity steam reducing valv |
| body,bonnet,bottom cap | WCB |
| seat,disc | 2Cr13 |
| sleeve, piston | silliman bronze |
| diaphragm | 1Cr18Ni9 |
| piston ring | alloy cast iron/PPL |
| regulative spring | 60Si2Mn |
| main valve spring | 50CrVA |
| pilot valve spring | 50CrVA |
| pilot seat pilot stem | 2Cr13 |
Main technical and performance index
| nomial pressure(Mpa) | 1.6 | 2.5 | 4.0 | 6.4 | 10.0 | 16.0 |
| shell test pressure(Mpa)* | 2.4 | 3.75 | 6.0 | 9.6 | 15.0 | 24 |
| sealing test pressure(Mpa) | 1.6 | 2.5 | 4.0 | 6.4 | 10.0 | 16.0 |
| maximum input pressure(Mpa) | 1.6 | 2.5 | 4.0 | 6.4 | 10.0 | 16.0 |
| output pressure scope(Mpa) | 0.04-1.0 | 0.05-1.6 | 0.08-2.5 | 0.2-3.5 | 0.5-3.5 | 0.5-4.5 |
| flow characteristic deviation(Mpa)P2G | GB12246-1989 | |||||
| pressure characteristic deviation (Mpa)△P2P | GB12246-1989 | |||||
| minimum pressure difference (Mpa) | 0.07 | 0.1 | 0.15 | 0.4 | 0.5 | 0.8 |
| leakage | GB12245-1989 | |||||
| *： shell test doesn’t include diaphrahm and cap | ||||||
(Cv) flow coefficient
| DN | 50 | 65 | 80 | 100 | 125 | 150 | 200 | 250 | 300 | 350 | 400 | 500 |
| Cv | 24 | 30 | 50 | 85 | 130 | 190 | 300 | 480 | 680 | 925 | 1150 | 1900 |
(PN1.6-4.0)external dimensions
| nominal diameter DN | external dimensions | |||
| L | H | Hl | ||
| 1.6/2.5MPa | 4.0MPa | |||
| 15 | 160 | 180 | 265 | 85 |
| 20 | 160 | 180 | 265 | 85 |
| 25 | 180 | 200 | 280 | 95 |
| 32 | 200 | 220 | 280 | 95 |
| 40 | 220 | 240 | 290 | 105 |
| 50 | 250 | 270 | 300 | 130 |
| 65 | 280 | 300 | 315 | 145 |
| 80 | 310 | 330 | 330 | 170 |
| 100 | 350 | 380 | 405 | 200 |
| 125 | 400 | 450 | 450 | 225 |
| 150 | 450 | 500 | 485 | 265 |
| 200 | 500 | 550 | 570 | 290 |
| 250 | 650 | 640 | 325 | |
| 300 | 800 | 740 | 360 | |
| 350 | 850 | 810 | 395 | |
| 400 | 900 | 950 | 430 | |
| 500 | 950 | 1080 | 500 | |
(PN6.4-16.0)：external dimensions
| nominal diameter DN | external dimensions | |||
| L | H | Hl | ||
| 6.4MPa | 10.0/16.0MPa | |||
| 15 | 180 | 180 | 280 | 100 |
| 20 | 180 | 200 | 280 | 100 |
| 25 | 200 | 220 | 300 | 115 |
| 32 | 220 | 230 | 300 | 115 |
| 40 | 240 | 240 | 315 | 130 |
| 50 | 270 | 300 | 340 | 135 |
| 65 | 300 | 340 | 355 | 150 |
| 80 | 330 | 360 | 370 | 175 |
| 100 | 380 | 450 | 205 | |
| 125 | 450 | 510 | 235 | |
| 150 | 500 | 555 | 275 | |
| 200 | 550 | 640 | 300 | |
| 250 | 650 | 720 | 335 | |
| 300 | 800 | 830 | 375 | |
| 350 | 850 | 880 | 410 | |
| 400 | 900 | 1020 | 445 | |
| 500 | 950 | 1080 | 515 | |
