Zhejiang Youfumi Valve Co., Ltd. |
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Pneumatic Actuated Fluoroplastic PFA/FEP/PTFE Lined Diaphragm Control Valve
Technical Specification
Design and Manufacture:GB/T4213 HG/T3704
End-to-end dimension:HG/T3704
Flange Standard:ASME/ANSI 16.5
Inspection and testing:GB/T4213 HG/T3704
Product Specification
Body Material:A216/WCB, A351/CF8,A351/CF8M,A351/CF3,A351/CF3M,LCB, A536
Trim:304,304L,316,316L
Stem:304,304L,316,316L,410,416,420
Lining Material:PFA, FEP, PTFE,PO
Bellow:PTFE
Nominal Diameter:NPS 1/2-10
Pressure Range:150lb 300lb JIS DIN
Connection Type:flange connection
Operation Method:Electric Actuator/Pneumatic film head etc.
Product description:
1. Pneumatic/electric lined single-seat control valve is the execution
unit in automation instrument system; it consists of many spring
film actuators/electric actuators and through-way fluorine-lined
single-seat regulator. Installed on the medium pipeline and
operated with other instrument to control parameters such as flow
rate etc. Due to the wetted parts of valve are lined with fluorine
plastic (PTFE, PFA, FEP), and the stem sealing adopts PTFE bellow
and packing, it has better performance in corrosion resistance and
sealing and its installation has better reliability. It??s suitable
for any corrosive medium except for "molten alkali metals and
fluorine element??. The lined control valves are widely used in
petrochemical, electric power, metallurgy, pulp&paper and other
industrial automation device.
2. Operating method: electric, pneumatic, hydraulic
3. Lining material: FEP, PFA, GXPO etc.
Structure and Operation Principle:
1. Pneumatic/electric fluorine-lined control valve is consists of
lined control valve body and straight travel pneumatic spring
diaphragm actuator or electric actuator.
2. Pneumatic/electric actuator is an important part of automatic
control system. Pneumatic actuators (figure 1) have both direct and
indirect action. When air pressure increases, the push rod stretch
out the membrane room, it is called direct action. When air
pressure increases, the push rod back into membrane room, it is
called indirect action, together with valve body to constitute the
air-to-close.
3. Figure 2 shows the working principle of positioned on
electrical/pneumatic valve: when the pressure signal input into
membrane room, generating pushing force to the diaphragm to
compress the spring, making the push rod move to drive the stem,
changing the flow area between the valve trim and seat, until the
counteractive by spring keep balance with pushing force on
diaphragm by signal pressure, so as to achieve the purpose of
process parameters automatic adjustment.