Zshtw-g is a high-temperature and low-load adjusting butterfly valve. The valve body and valve plate are all made of stainless steel plate. It adopts plane metal seal method and can be used as general sealing valve. It is especially suitable for the flow rate and pressure control of air or other gases in the state of low pressure difference and high temperature. The valve is also suitable for general temperature and corrosion resistance requirements.
specifications
□Main technical parameters
○The valve body
Shape: flat offset cast valve body
Nominal diameter： DN125、150、200、250、300、350、400、450、500、
600、700、800、900、1000mm
Nominal pressure：0.25MPa
The connection method：DN125~500 对夹式 DN600~1000 Flange connection
The standard of the flange：JB/T79.1 — 94
Material is qualitative：CF8 CF8M（450℃～650℃）
ZG40Cr25Ni20、ZG35Cr26Ni12（650℃～1100℃）
Upper cover: elongated A：450℃～650℃（G1）
B type：650℃～1100℃（G2）
Note: the above temperature range is within the pressure and temperature range of the material used.
Filler: flexible graphite
○In the valve components
Valve plate type: flat
The valve material：CF8 CF8M（450℃～650℃）
ZG40Cr25Ni20、ZG35Cr26Ni12（650℃～1100℃）
A shaft material：316、GH132、ZG40Cr25Ni20、ZG35Cr26Ni2
Flow characteristics: approximately equal percentage
Valve plate corner： 90°
○actuator
Type: double acting pneumatic piston actuator GTD
Single acting pneumatic piston actuator (with spring reset) GTX
Gas supply pressure： 0.4~0.7MPa
Air interface: 1/4NPT
Action type: single action: open or closed
Double acting: open and close the control valve according to the signal conversion
○Attachment (as required)
Positioner, air filter pressure reducing valve, hand wheel mechanism, limit switch, solenoid valve, valve position transmitter,
Pneumatic accelerator, position guard valve, etc.
□Main performance parameters
○Basic error: + / - 2.5% (with locator)
○Back to the poor：2.5%
○Dead zone：1.0%
○Drain leakage quantity：≤ 0.5% Kv rated value
Rated flow coefficient Kv value
□Actuator mix and maximum allowable pressure difference (MPa) (table 1)
□Maximum allowable pressure difference (mm) (table 2)
Overall dimensions
○ Clamp mounting dimension for external appearance
○ Flange mounting dimensions
