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Attemperator/Desuperheater Spraywater Control Valve Application in Power Plant.
Operationg Conditions: The supply water for the spray valves usually comes from the Feedpump discharge. The reheat
pressure is equal to the superheater or reheat pressure plus nozzle back pressure. The superheat
spray valve sees a low DP, ususlly 200 to 300 psi. Turndown and accuracy of positioning is of key
concern. The reheat spray valve is normally a high DP, with cavitation and seat leakage a major
concern. The major problem exists with reheat spray. High DP causes excessive seat leakage and the valve
normally operates close to the seat. Seat leakage, wire draw and inaccurate control causes a
reduction in steam temperature and efficiency.
The valve applys to the severe fluid condition of high-preesure-drops between inlet and outlet side on the pipeline.
Type: straightway
connection type: RF & RTJ ASME B16.5
BW ASME B16.25
SW ASME B16.11
DN:3/4"~6"
PN:1450PSI~~4640PSI
Pressure: ANSI Class 600lb~~2500lb
Body materials: ASTM A105, F22, F304. F316, F304L,F316L. Monel titanium alloy etc. or depend on customer's special requests.
inner materials: ASTM A276 431, ASTM A276 420, 440C, 630 Stainless steel, 316,316L overlaying welding Stellite alloy.
Valve designed on modular assembly principle
Circulatory flow impact structure and the pressure to be reduced step by step.
With our special technology, we offer a level of expertise that is excellent in providing innovative solutions to the most challenging flow control application in critical working condition.
Internal body structure
Leakage-free pressure-balanced design
Low sound level, Easy assembly
Designed for preciaion flow control with high pressure, high temperature and aggressive fluids
Other shapes such as single-seat, minitype disc/plug can be available.
Actuator offered by manufacturer or according to the customer's requests.
It's unique structure makes it have first-class throttling performance and long service life at the same time, overcoming both the cavitation erosion and the flow characteristic distortion, which conventional high-pressure-difference control valves can't avoid.
Main parts materials
parts | materials | parts | materials |
body | ASTM A105, 316 etc. | packing | Flexible graphite |
seat ring gasket | Flexible graphite+mesh board | gland | ASTM A182 F316, A276 |
seat ring | ASTM A279 431 | stem | ASTM A182 F316, A276 |
spiral wound gasket | ASTM A279 431 | cover board | ASTM A29 1045 |
disc | Flexible graphite+316 | bonnet | A216 WCB, 316 etc. |
Bonnet gasket | Flexible graphite+mesh board | cage gasket | Flexible graphite+mesh board |
Main nuts | ASTM A29 1045 | Main bolts | ASTM B7 |
PS: When ordering, please specify nominal pressure, bore diameter, working pressure and temperature, max flow, max design pressure differential, medium, type of actuator and connection standard etc.
Spraywater control valve (reheat, superheat)