Suzhou Delan Energy Science & Technology Co., Ltd. [China]

Recirculation Control valve 1.Excellent sealing and control 2.Cavitation&Erosion resistant 3.Anti-high pressure drop trim

Boiler Feed-water Pump Recircultion Control Valve:

Minimum flow control valve of the recycling system of feedwater pump of boiler in power plant.

The most critical application in a Power Station is the Boiler Feed Pump Minimum Recirculation Service. A pump should have a minimum Flow through it to take care of the cooling requirements of the Pump.  Hence even if the Feed Water requirements are very low(due to low load conditions)the pump should handle a minimum flow. To ensure a mount of Flow has to be recirculated back to the Deaerator as the Flow requirements of the Boiler may not be sufficient to satisfy the minimum Recirculation requirements of the pump.  The parameters are obviously very detrimental for any valve to handle. The valve has to drop a pressure of 220-250 bar to 10 bar(Deaerator ppressure). Also it may be noted that the outlet conditions of the valve are near saturation, and hece the valve is very susceptible to high energy Cavitaion and Flashing.

The valve applys to the severe fluid condition of high-preesure-drops between inlet and outlet side on the pipeline.

Type: straightway

connection type: BW  ANSI B16.25, SW ANSI B16.11, FLG ASME B16.5

DN:3/4"~6"

PN:1450psig~~4640psig

Pressure:ANSI Class 600lb~~2500lb

Body materials: ASTM A105, F22, 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.

Actuator: Pneumatic Diaphragm actuator & Electirc operator

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

Boiler feed pump stystem

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(drop) control valves can't avoid.

 Main parts materials

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.

Electric Operated Boiler Feed Pump(BFP) Minimum Recirculation Control Valve