Uses And Features
Pneumatic. membrane lining plastic corrugated pipe regulating valve is the execution units in the automation instrument system, installed on the medium pipeline, with other instrument, control parameters such as flow. Contact with liquid in the valve body wall and components are lining F46 or F4 fluorine plastic stem seal adopts double sealing structure,corrugated pipe and packing to make better safety and reliability. Besides has a reliable sealing performance, resistant to almost all chemical medium (including concentrated sulfuric acid and aqua regia) corrosion,appropriate control of virulent and precious, volatile and permeability ofmedia, widely used in chemical, petroleum, metallurgy, medicine, light textile industry automation device.
The structure and working principle
Pneumatic membrane lining fluoride bellows valve is a kind of anti-corrosion through single-seat regulating valve, it is composed of ZJH pneumatic precision small fim actuators and two major part is regulating valve components, as shown in figure 1. Actuators and DCS control component of the output signal, gas supply pressure on the diaphragm,the spring compression, push or pull actuators push rod and the valve core to move up and down, and transform the annular clearance of the valve core and valve seat area, regulate traffi, to achieve the purpose of to adjust the process. Components inside the bonnet of the valve body is equipped with bellows components, the lower the top of the valve core and ptfe bellows seal connections, corrugated pipe on the upper valve body, valve cover, bolt, nut sealing connection. In this way, the bellows dielectric isolation with the outside world, to ensure the seal, and valve disc up and down movement is flexible, thus shows the characteristics of bellows seal.
The major parts material
Valve, pipe joint: for steel, lined with fluoroplastic (WCB + F46; ZG25B +F4), etc.;
The valve stem, valve core: 2 cr13, of PTFE valve core with fluorine plastic The major parts material lining;
PTFE bellows, packing: PTFE.
The major parts material
Model and basic parameters of the actuator
| Model | HA2D/R | HA3D/R | HA4D/R | |
| Action fom | Positive or negative effects | |||
| Ar supply pressure (Mpa) | 0.14、0.25、0.40 | |||
| Spring range(Mpa) | 0.02~0.10、0.04~0.20、0.08~0.24 | |||
| Effective area of thin film( mm² ) | 400 | 630 | 1000 | |
| Air source connector | Rcl/4 | |||
Basic parameters of valve body components
| Nominal Diameter | 25 | 32 | 40 | 50 | 65 | 80 | 100 | 125 | 150 | 200 | ||||||||||
| Valve body diameter | 12 | 25 | 25 | 32 | 32 | 40 | 40 | 50 | 50 | 65 | 65 | 80 | 80 | 100 | 100 | 125 | 125 | 150 | 150 | 200 |
| Rated CV value | 2.4 | 10 | 10 | 17 | 17 | 25 | 25 | 40 | 40 | 60 | 60 | 110 | 110 | 175 | 175 | 220 | 220 | 260 | 260 | 450 |
| Stroke(mm) | 16 | 25 | 40 | 50 | ||||||||||||||||
| Actuator | HA2D/R | HA3D/R | HA4D/R | |||||||||||||||||
| Operation temperature | -30~+200 | |||||||||||||||||||
| Working pressure | PN1.0 | |||||||||||||||||||
| Nominal pressure | PN1.6 | |||||||||||||||||||
| Flow charactenstics | Straight line,equal percentage | |||||||||||||||||||
| leakage rate | Straight ine,equal percentage 10³ | |||||||||||||||||||
