PTFE-lined globe valves are devices used with any organic solvent or reagent. The valve's opening and closing element is a plug-shaped valve disc with a flat or conical sealing surface. The valve disc moves linearly along the centerline of the fluid. The valve stem movement can be either a rising stem type (the valve stem rises and falls, but the handwheel does not) or a rising and rotating stem type (the handwheel rotates and rises and falls together with the valve stem, and the nut is located on the valve body). GNEE Group offers custom PTFE-lined globe valve services; contact us for drawings and quotations.
PTFE-lined globe valves Structural Features
The PTFE-lined Globe Valve uses a plug-shaped valve disc as its opening and closing element. This disc moves up and down along the valve seat's central axis via a valve stem, controlling the flow of media. Its movement types include:
Rising Stem Type: The valve stem rises and falls, but the handwheel remains stationary;
Rising Rotary Stem Type: The handwheel and valve stem rotate and rise together, with the nut located on the valve body.
Structural Forms
Straight-through Type: The most common type, suitable for most piping systems;
Angle Type: Can be installed at pipe bends, saving space;
Direct Flow Type: Minimal flow resistance, suitable for applications requiring high fluid resistance.
Sealing Design
The valve disc and valve stem are designed as a single unit to prevent internal components from being ejected, improving safety;
The sealing surface is made of fluoroplastics (such as PTFE, FEP) or graphite-filled PTFE, which is wear-resistant and corrosion-resistant.
PTFE-lined globe valves Materials and Corrosion Resistance
Valve Body Material
Carbon Steel (WCB): Suitable for general operating conditions, low cost;
Stainless Steel (304/316L): Resistant to external corrosion, suitable for coastal or harsh environments.
Inner Lining Material
PTFE (Polytetrafluoroethylene): Wide temperature range (-150℃), resistant to most strong corrosive media, commonly known as the "King of Plastics";
FEP (Fluoroethylene-propylene copolymer): Temperature resistance -150℃, good flexibility, suitable for complex flow channels;
PFA: Higher temperature resistance, long-term operating temperature can reach -150℃, but the price is higher.
Sealing Surface Material
PTFE + Metal Support: Strong corrosion resistance, suitable for strong corrosive media;
PTFE Filled Graphite: Better wear resistance, suitable for media containing a small amount of soft impurities.
PTFE-lined globe valves Performance Parameters
Nominal Diameter: DN10~DN300 (commonly DN15~DN100);
Nominal Pressure: PN1.0~PN2.5 (pressure limit for fluoroplastic lining; pressure above PN2.5 may cause lining deformation);
Operating Temperature:
PTFE Lining: --150℃ (long-term use recommended ≤150℃);
FEP Lining: -150℃;
Sealing Grade: ≤VI (zero leakage);
Flow Resistance Coefficient: ≤3.5 (conventional structure, slightly higher than ordinary gate valves).
PTFE-lined globe valves Applications
Chemical Industry
Pipelines for conveying highly corrosive media such as concentrated hydrochloric acid, concentrated sulfuric acid, nitric acid, and strong alkalis;
Control of corrosive media in reaction vessels and pipelines.
Pharmaceutical Industry
Conveying high-purity pharmaceutical solutions or corrosive raw materials, conforming to GMP standards;
Precisely regulating pharmaceutical flow and preventing strong alkali corrosion.
Metallurgical Industry
Valves for electroplating solutions and pickling lines;
Pickling wastewater treatment pipelines.
Electroplating Industry
Transportation of highly corrosive media such as chromium plating solutions and nickel plating solutions;
Automated control improves electroplating efficiency.
Laboratory Applications
Pipelines for transporting organic solvents (such as benzene and acetone);
Suitable for medium and low temperature environments, easy to operate.
PTFE-lined globe valves Selection Considerations
Media and Temperature
High-temperature, highly corrosive media (such as high-temperature concentrated sulfuric acid) require PTFE lining;
Medium and low temperature media requiring flexible linings (such as complex flow channels) require FEP lining;
Media containing small amounts of soft impurities require PTFE-filled graphite sealing surfaces.
Pressure and Differential Pressure
High-pressure systems (PN20~PN25) require thickened outer shells + reinforced linings;
To prevent excessive pressure and differential pressure from causing bellows rupture (if bellows seals are used).
Connection Method
Low-pressure, small-diameter equipment requires threaded connections;
Industrial main pipelines require flange connections (DN15~DN200).
Drive Method
For explosion-proof scenarios (such as chemical workshops), select explosion-proof pneumatic/electric drive;
For simple branch pipes (such as laboratory reagent transport), select wheeled drive.
Installation and Maintenance
Avoid strong impacts to prevent liner detachment;
Regularly check the integrity of the liner and the valve disc seal.
PTFE-lined globe valves factory
Send us your drawings and we'll customize it for you.