Boiler feed water control valve

The boiler feed water control valve is a novel high pressure differential control valve with pressure balance sleeve structure. The sleeve and valve core of the valve internal components are a kind of mixed structure of porous and cascade. The fluid first passes through the sleeve window for the first stage throttling, and then through the three-stage continuous cascade throttling. The allowable pressure difference is large and the sealing is good. The fluid channel is s-streamline, with large flow rate and good dynamic stability of the control valve.
The valve is one of the important control valves in boiler feed water system of thermal power plant. It can also be used in automatic control system of petrochemical and other industries to control high pressure differential fluid. It can be equipped with electric actuator and pneumatic actuator.
The valve has the following advantages:
The structure of the valve internal component is novel, and the sleeve throttling is used to effectively control the flow rate at about 30m / s.
The throttle face is separated from the sealing surface of the valve seat, which can effectively protect the sealing surface with excellent sealing performance and long service life.
The valve internal components are made of high strength stainless steel, the surface of the parts is hardened, the hardness can reach HRC70, and the erosion resistance is strong.
The valve core adopts pressure balance structure to reduce the unbalanced force of fluid acting on the valve core.
Technical parameters and performance
body
Form forging straight through type
Nominal diameter dn50,80100150200250300
Nominal pressure class600-4500lb
Connection type BW welding form
Material 20 ? forged steel
The operating temperature is less than 420 ℃
Gland type bolt compression type
Packing high temperature graphite braided packing
Valve assembly
Spool type pressure balance cascade type
Flow characteristic equal percentage characteristic
Sleeve type separate type
Surface hardening treatment of special stainless steel
Executive Agency
Form pneumatic piston actuator or electric actuator
Ambient temperature - 30-70 degrees
The action mode is gas close or electric close
Accessories positioner, handwheel mechanism, travel switch, solenoid valve, valve position transmitter, etc
performance
The discharge is less than 0.01% of the rated Kv value, meeting the requirements of ansib16.104-1976iv
Return difference less than 1 of full stroke (with positioner)

+ - 1 with less than full stroke linearity (with positioner)