ANSI GB Flange Spring Returned Pneumatic Modulating 4-20mA Signal
Control Valve
Product introduction:
A control valve is a power-operated device used to control or alter
the flow of fluids like gas, oil, water, and steam. It moves after
receiving a signal from a controller, changing the flow. It is a
control device used to manage and direct the flow of fluids by
changing the size of the flow route. It offers direct control over
flow, temperature, pressure, or liquid level. In order to control
the flow of fluid, a control valve uses an actuator to adjust the
position of the valve plug or disk. These are applied to keep a
process variable as close to the target set point as is practical.
The components of this valve installation include a valve body, an
actuator, a positioner. The body consists of trim components and a
bonnet assembly. Its structure supports seating surfaces and a
valve closure part while withstanding fluid static pressure and
differential pressure, allowing fluid flow, providing
pipe-connecting ends, and all of the above. Pneumatic, hydraulic,
or electrically powered actuators are the tools that generate the
force needed to open and close the valve. To maintain a desired
set-point, positioners track and manage real actuator movement.
Pneumatic diaphragm type regulating valve is composed of
multi-spring pneumatic actuator and regulating valve body. With the
top guide structure, it has the advantages of compact structure,
light weight, sensitive action, fluid channel is streamlined S,
small pressure drop loss, large valve capacity, accurate flow
characteristics, convenient disassembly and assembly. It is widely
used to accurately control the process parameters of gas, liquid
and other media to keep the pressure, flow rate, temperature and
liquid level at the given value. Especially suitable for allowing
small leakage and the valve front and rear pressure difference is
not large occasions.
Product technical parameter:
Valve type | Straight through single seat casting control valve |
Port size | DN20-DN450 |
Pressure nominal | PN10-PN64 |
Flange standard | JB/T79.1-94,792-94, ASME B16.5 |
Body raw material | Cast steel (ZG230450) Stainless steel (ZGICr18Ni9Ti,
ZGICr18Ni12M02Ti) etc. |
Bonnet | Standard:-20 to 200℃, Heat dissipating:230-450℃ Cryogenic:-60--196℃ Bellow sealed:-40-350℃ |
Bonnet type | Bolted pressure |
Packing | PTFE, Graphite |
Disc type | Single seat plunger type and sleeve type |
Disc raw material | Stainless steel(1Cr18Ni9Ti,1Cr18Ni12M02Ti, 316L) |
Flow characteristics | Equal percentage and linear characteristics |
Actuator type | ZHA/B multi spring diaphragm actuator |
Actuator type | ZHA/B-11 | ZHA/B-22 | ZHA/B-23 | ZHA/B-34 | ZHA/B-45 |
Effective area (cm2) | 220 | 350 | 350 | 560 | 900 |
Rated stroke (mm) | 10 | 16 | 25 | 40 | 60 |
Spring range (Kpa) | 200-200, 40-200, 80-240, 20-60, 60-100 |
Diaphragm material | EPDM NBR |
Air supply | 140-400KPa |
Air source | RCl/4" |
Ambient temperature | -40 to 85℃ |
Product features:
1. The balanced spool structure, the axial unbalance force is
small, the allowed pressure difference is large, the stability is
good.
2. The sleeve has strong interchangeability, convenient disassembly
and assembly, easy.
3. All-metal spool structure, up to level IV leakage quasi soft
seal structure spool to level VI leakage quasi.
4. According to the principle of fluid mechanics, the valve body is
designed into an equal section of low flow resistance channel, the
inherent adjustable ratio is 50, and the rated flow coefficient is
increased by 30%.
5. The actuator adopts multi-spring structure, which can reduce the
height by 30%. 30% weight reduction.
