J41F46 fluorine lined globe valve

J41F46 fluorine lined globe valveSuitable for use in pipelines with various concentrations of acids and strong oxidants at -50~150 ℃, as well as strong alkaline organic solvents of various concentrations and other corrosive gases and liquid media.

J41F46 fluorine lined globe valveBasic Overview

Fluorine lined globe valves belong to forced sealing valves, so when the valve is closed, pressure must be applied to the valve disc to force the sealing surface not to leak. When the medium enters the valve from below the valve disc, the resistance that the operating force needs to overcome is the frictional force between the valve stem and the packing, as well as the thrust generated by the pressure of the medium. The force required to close the valve is greater than the force required to open it, so the diameter of the valve stem should be larger, otherwise the valve stem bending fault may occur. After the appearance of self sealing valves, the flow of the medium in the shut-off valve is changed to enter the valve chamber from above the valve disc. At this time, under the pressure of the medium, the force to close the valve is small, while the force to open the valve is large, and the diameter of the valve stem can be correspondingly reduced. Meanwhile, under the influence of the medium, this type of valve is also relatively tight. The "Three Modernizations" of valves in our country once stipulated that the flow direction of globe valves should be from top to bottom.

fluorine-lined globe valve

When the fluorine lined globe valve is opened and the opening height of the valve disc is 25% to 30% of the nominal diameter, the flow rate has reached a large level, indicating that the valve has reached the fully open position. So the fully open position of the shut-off valve should be determined by the stroke of the valve disc.

advantage

Fluorine lined globe valves have the following advantages:

The structure is simple, and manufacturing and maintenance are relatively convenient.

Small work schedule and short opening and closing time.

Good sealing performance, low friction between sealing surfaces, and long service life.

The disadvantages of fluorine lined globe valves are as follows:

The fluid resistance is high, and a large amount of force is required for opening and closing.

Not suitable for media with particles, high viscosity, and easy coking.

Poor regulation performance.

The types of high-pressure globe valves are divided into external thread type and internal thread type according to the position of the valve stem thread. According to the flow direction of the medium, there are straight through, direct current, and angular types. Globe valves are divided into packing sealed globe valves and bellows sealed globe valves according to their sealing forms.

Lining material

Perfluoroethylene FEP (F46)

Applicable medium:

Any organic solvent or reagent, dilute or concentrated inorganic acid, base, ketone, aromatic hydrocarbon, chlorinated hydrocarbon, etc.

Operating temperature

-85~150

Features: The mechanical, electrical, and chemical stability are basically the same as F4, but the outstanding advantages are high dynamic impact toughness, weather resistance, and radiation resistance.

Polytrifluoroethylene PCTEF (F3)

Applicable medium:

Various organic solvents, inorganic corrosive liquids (oxidizing acids)

Operating temperature: -195~120

Features: Heat resistance, electrical and chemical stability second only to F4, mechanical strength, creep performance, and hardness better than F4

Polypropylene: RPP

Applicable media: aqueous solutions of inorganic salts, dilute or concentrated solutions of inorganic acids and bases.

Operating temperature: -14~80

Characteristics: One of the lightweight plastics, its yield, tensile and compressive strength, hardness are superior to low-pressure polyethylene, it has outstanding rigidity, good heat resistance, easy molding, and excellent cost. Modified mobility, fluidity, and bending elasticity.

Polyvinyl fluoride: hard PVC

Applicable media: water-resistant, concentrated alkali, non oxidizing acids, chain hydrocarbons, oil, ozone, etc.

Operating temperature: 0-55

Features: high mechanical strength, excellent chemical stability and dielectric properties, good oil resistance and anti-aging resistance, easy to fuse

And bonding, with a lower price.

Polytetrafluoroethylene (PTFE) (F4)

Media used: strong acid, strong alkali, strong oxidant, etc.

Operating temperature: -200~180

Characteristics: It has excellent chemical stability, high heat and cold resistance, low friction coefficient, is a self-lubricating material, but has low mechanical properties, poor fluidity, and large thermal expansion.

Polyvinylidene fluoride PVDF (F2)

Medium of use: resistant to most chemicals and solvents,

Operating temperature: -70~100

Features: The tensile and compressive strength of the product is better than that of F4, and it is resistant to bending, weather, and radiation. Resistant to light and aging, characterized by good toughness and easy molding.

Polyolefin: PO

Applicable media: various concentrations of acid-base salts and certain organic solvents.

Operating temperature: -58~80

Characteristics: It is an ideal anti-corrosion material in the world and has been widely used for lining large equipment and pipeline components in rotary molding.

Precautions

The installation and maintenance of fluorine lined globe valves should pay attention to the following matters:

The shut-off valve operated by handwheel and handle can be installed at any position in the pipeline.

Handwheels, handles, and dynamic mechanisms are not allowed for lifting purposes.

The flow direction of the medium should be consistent with the arrow direction shown on the valve body.

Globe valve, also known as shut-off valve, is a widely used type of valve. Its popularity is due to the low friction between the sealing surfaces during the opening and closing process, its durability, small opening height, easy manufacturing, and convenient maintenance. It is not only suitable for medium and low pressure, but also for high pressure. Its closing principle is to rely on the pressure of the valve stem to tightly fit the sealing surface of the valve disc with the sealing surface of the valve seat, preventing the flow of the medium.

The shut-off valve only allows one-way flow of the medium and has directionality during installation. Its structural length is greater than that of a gate valve, and at the same time, it has high fluid resistance. During long-term operation, its sealing reliability is not strong.

Globe valves are divided into three categories: straight through, right angle, and DC inclined globe valves.

structural characteristics

Compared with gate valves, globe valves have a simpler structure and are easier to manufacture and maintain.

The sealing surface is not easily worn or scratched, with good sealing performance and long service life.

When opening and closing, the valve disc stroke is small, the opening and closing time is short, and the valve height is small.

The valve disc and valve stem are designed as an integrated structure, which is compact and safe to use.

There are three structural forms of globe valves: straight through type, straight through type, and angle type, among which straight through type is commonly used Angle type can be installed at the corners of pipeline systems, while DC type flow resistance is smaller in globe valves.

Configure pneumatic and electric devices according to user needs to meet the needs of remote control and program control.

Replacing the lining material of the parts can be applied to various media.