Feedwater heater ON/OFF valve
Description
In thermal power generation the feedwater heater uses heat transfer from extraction steam to the feedwater pre-heatingit,improving the overall plant efficiency. In case of a feedwater heater malfunction, it needs to be isolated using a bypass system to allow maintenance without disrupting the flow of feedwater to the boiler. This system consist of two ON/OFF valves placed upstream and downstream from the feedwater heater, with two separate conduits connecting them. One conduits routes the feedwater through the heater, while the other bypass it.
Key features
Bodies manufactured by casting
Pressurized seal design, more reliable the seal.
The sealing surface is welded with hard alloy. Wear resistant and corrosion resistant, reliable sealing, long service life.
Three-way valve, built-in hydraulic actuation (Options pneumatic/ electromechanical)
Product structure drawing
Type: GJR761Y-250(200)
Design standard
Design & manufacture | End to end dimension | End dimension | Inspection and test | Press-temp ratings |
NB/T47044 | NB/T47044 | NB/T47044 | NB/T47044 | NB/T47044 |
ASME B16.34 | ASME B16.10 | ASME B16.25 | ASME B16.34 | ASME B16.34 |
Main parts material
Body | Bonnet | Disc | Ring retainer | Yoke | Stem |
WCB | WCB | 20/A105 | 38CrMoAlA | ZG230-450/WCB | 38CrMoAlA |
Technical specification and end dimension and overall dimension
Nominal Press. | PN250(PN200) |
Shell test MPa | 37.5(30) |
Seal test MPa | 27.5(22) |
Nominal diameter | d | D | L | H | H1 |
150 | 140 | 172 | 700 | 1012 | 300 |
175 | 169 | 224 | 900 | 1012 | 360 |
200 | 195 | 250 | 1060 | 1109 | 425 |
Remark: Above data only for reference, we can provide other different design according to the customer’s special requirements.