Pump Recirculation Control Valve

1.Recirculation Control Valve 2.Excellent Sealing&Control Characteristic 3.Anti-Cavitation&Flashing 4.Labyrinth Disk Trim

The Recirculation Control Valve for Boiler Feedwater Pump in Thermal Power Plant

The fuction of a boiler feedpump recirculation valve is to insure that adequate flow is maintained throught the boiler feedpump to prevent overheating of the pump and cavitation. The pump manufacturer calculates the minimum flow required to prevent the risk of premature pump failure due to bearings overheating and seizure or excessive thermal expansion of impeller blades.  A minimum flow through the boiler feedpump also protects against erosion and instability caused by cavitation at low flow conditions. Because the highest pressure in a power plant is produced at the boiler feedpump discharge, this equipment has the highest damage potential.

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

Type: straightway(Globe)

Connection type: BW  ANSI B16.25

DN:1", 1/2", 2", 3", 4"

PN:10~~32Mpa

Pressure: 900~~2500LB

Body materials: ASTM A105, . 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.

   The circumfluent right-washing type

  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,  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.

Pump Recirculation Control Valve