Internal Thread Piston 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
Internal thread piston steam reducing valves
Structural feature and function
This series of pressure relief valve belongs to pilot piston reducing valve. It consist of two parts the main valve and pilot valve. The main valve is mainly constituted by seat, main valve disc, piston and springs. Pilot Valve consists mainly of seat and disc diaphragm, spring, adjust springs. Through adjusting spring pressure regulating outlet pressure, using diaphragm sensing outlet pressure changes,
And through the pilot valve on-and-off driven piston to adjust the size of flowing area at the throttle part, realizing pressure reducing and stabilizing function.
This production is mainly used on steam piperoad, with pressure reducing and stabilizing function.
Dimensions & constructral diagram
Internal thread piston steam reducing valve constructral diagram
Main technical parameter and performance norm
| nominal pressuse(Mpa) | 1.6 | 2.5 |
| casing body test pressure(Mpa)* | 2.4 | 3.75 |
| sealing test pressure (Mpa) | 1.6 | 2.5 |
| Max. inlet pressure (Mpa) | 1.6 | 2.5 |
| outlet pressure range (Mpa) | 0.1-1.0 | 0.1-1.6 |
| pressure property deviation (Mpa)△P2P | GB12246-1989 | |
| flow property deviation (Mpa)△P2G | GB12246-1989 | |
| min. pressure difference | 0.15 | 0.15 |
| leakage quantity | GB12245-1989 | |
Material of main parts
| name of part | material of part |
| body,bonnet,bottom cap | WCB |
| seat, disc | 2Cr13 |
| cylinder sleeve | 2Cr13/25(hard-chrome plating) |
| piston | 2Cr13/ copper alloy |
| piston ring | alloy cast iron |
| pilot valve seat, pilot valve rod | 2Cr13 |
| diaphragm | 1Cr18Ni9Ti |
| main valve spring | 50CrVA |
| pilot valve main spring | 50CrVA |
| adjustable spring | 60Si2Mn |
Flow factor(Cv)
| DN | 15 | 20 | 25 | 32 | 40 | 50 |
| Cv | 1 | 2.5 | 4 | 6.5 | 9 | 16 |
Connecting dimensions
| nominal diameter DN | G | L | H | Hl |
| 15 | 1/2" | 140 | 295 | 90 |
| 20 | 3-4" | 140 | 330 | 98 |
| 25 | 1" | 160 | 330 | 110 |
| 32 | 1-1/4" | 180 | 330 | 110 |
| 40 | 1-1/4" | 200 | 345 | 125 |
| 50 | 2" | 230 | 345 | 125 |
