Corrosion Protection Applications for Valves

Corrosion of valves is widely used in a chemical or electrochemical environment. As the “corrosion” phenomenon appeared in metal and spontaneous interaction among the surrounding environment, therefore, the environment used isolation or more non-metallic composite materials, then become a common concern.


It is well known that the corrosion damage of metals has a considerable influence on the function, duration, reliability and service life of valves. The action of mechanical and corrosive factors on metals greatly increases the total wear of the contact surface.

During operation, the frictional surfaces cause wear and tear as a result of simultaneous mechanical action and chemical or electrochemical interaction between the metal and the environment. On the valve, the pipeline of complex climatic conditions such as work; oil, natural gas and oil water medium hydrogen sulfide, carbon dioxide and some organic acids to increase the destructive power of the metal surface, which quickly lose their ability to work.

Due to chemical corrosion of metals depends on the temperature, the friction parts of the mechanical load, lubricating materials contained in the sulfide and acid stability and media exposure duration and the process of catalytic metal nitride, Corrosion Erosion of material elements of the metal conversion speed and so on. Therefore, the anti-corrosion method of metal valves and the application of synthetic valve materials, valve industry has become one of the themes of the study.

A metal valve corrosion, can be understood as the coated metal valve to protect against corrosion protection layer conditions (such as paint, lubricating materials and so on), whether the valve is in the manufacturing storage transport.

The method of metal valve corrosion protection depends on the required protection period, transportation and storage conditions, valve construction characteristics and materials, of course, to take into account the economic effects of lifting the anti-corrosion.


There are 4 main methods of corrosion protection for metal valves and their parts:
1. Put volatile corrosion inhibitors into the atmosphere of steam
2. Use blocked water and alcohol solution.
3. Apply the anticorrosive coating to the surface of the valve and its parts.
4 apply the thin film or polymer of the blocked film to the surface of the valve and its parts.

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Characteristics and Advantages of Fixed Ball Valve

Fixed ball valve features
1, double block and emission features: the fixed valve seat by spring preload variable, whether the valve is fully open or fully closed state, on the downstream side of the seat to block the body cavity fluid, the retentate through the discharge valve.

2, automatic pressure relief valve body cavity retention function: the temperature rise caused by abnormal pressure, without going through the safety valve, and the valve seat can function alone, to ensure the safety of the valve in the delivery of liquid medium.

3, fire safety structure: the valve has fire safety function, its design and manufacture comply with the requirements of API607 and API6FA.


Advantages of fixed ball valves:
1, sealing grease emergency ambulance: as the foreign media or fire caused by failure of the valve seat sealing, valve grease and grease gun provides fast connection, convenient to be injected into the valve seat seal parts, relieve leakage.
2, reliable stem sealing and low operating torque: in addition to setting the standard sealing ring, the packing gland has also set up a “O” type sealing ring, double seals to ensure the reliability of the valve stem seals; addition of graphite filler and seal fat into the fire so that the valve stem leakage to a minimum. The stem plain bearings and thrust bearings make the valve easy to operate.

3, full diameter or shrink diameter: according to the needs of the use of full diameter or shrinkage structure. The diameter and the bore of the all way valve are the same as the diameter of the pipeline, so that it is easy to clean the pipeline.
4, the valve stem can be lengthened: according to the installation or operation needs, can be extended to the valve stem. The utility model relates to an extension rod ball valve, which is particularly suitable for occasions such as city gas, etc., that a buried pipeline is needed. The lengthened stem size is determined according to customer requirements.
5, flexible operation: with small friction coefficient and good self lubrication of the valve seat and stem bearings, greatly reducing the valve operating torque. As a result, the valve can be operated flexibly and freely even in the absence of a sealed grease.

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Sticking or Blocking Treatment Method for Lining Valve

Due to the medium principle, fluorine valve will be jammed or blocked, unable to work, at this time, it should avoid the occurrence, or carries on the processing, this paper mainly introduces several methods:
Cleaning method
Pipe welding slag, rust, slag in the throttle, steering parts, balance valve cover holes caused by blocked or stuck to the spool surface, surface oriented production strain and scratches, sealing surface indentation and so on. This often occurs in the initial stage of the new commissioning system. This is the most common fault. In this case, we must remove the cleaning, remove residue, the sealing surface should be ground by the injury; at the same time, open the bottom plug, to flush from the balance under the valve cover hole fall into the slag material, and pipe for flushing.

External scour method
Some easy to precipitate solid particles of the medium containing the ordinary valve adjustment, often plugged in the throttle, guide, can be connected in eroding gas valve cover Cypriot department and steam. When the valve is blocked or stuck, the external gas or steam valve is opened, so that the flushing operation can be completed under the condition that the lining valve is not moved, so that the valve is in normal operation.
Pipe filter Installation method
For small caliber lining valve, especially super small flow lining control valve, its throttle clearance is very small, medium can not have a little slag. In case of congestion, it is better to install a filter on the front of the valve to ensure the smooth passage of the medium. With the use of the positioner of fluorine control valve, locator work is not normal, its gas path throttling plug is the most common fault. Therefore, when the belt positioner work, you must handle the gas source, the usual method is to install the air filter pressure reducing valve in front of the positioner gas pipeline.

Increasing throttling clearance method
The medium of solid particles or pipe was washed away with things such as welding slag and rust caused by congestion, stuck fault because can not throttle, can use larger throttle clearance a throttle area of open window, open the valve spool and sleeve, because its cutting area of focus instead of circular distribution. The fault can easily be excluded. If it is a single, two seat valve, the spool can be changed to “V” – shaped mouth of the spool, or into a sleeve valve. For example, a chemical plant has a two seat valve often stuck, and recommended to use the sleeve valve, the problem will be resolved immediately.
Medium scour method
The use of the medium’s own erosion energy, to improve the anti blocking function of the valve. The common methods are as follows: for closed type flow; with a streamlined body; the throttle put the most severe erosion, using this method should pay attention to improve the erosion resistance of cutting pieces of material.
Straight to corner method
Flow path is complex, the upper and lower cavity, dead space, for the precipitation of the medium provides a place. Angle connection, the medium is like flowing through the elbow, the erosion performance is good, the dead zone is small, easy to design into the flow line. Therefore, the use of straight through lining fluorine control valve to produce slight congestion can be changed to angle valve.

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What are the Features of Ball Valves

Ball valve is a ball with a circular channel for opening and closing parts, the ball with the stem rotation to achieve open and close operation of the valve. The opening and closing of the ball valve is a ball with a hole, rotating around the axis perpendicular to the channel, so as to achieve the purpose of opening and closing the channel. The ball valve is mainly used for opening and closing pipes and equipment.

Main advantages of valve are as follows:
1 for regular operation, open and close quickly, light.
2 small fluid resistance.
3 the utility model has the advantages of simple structure, relatively small size, light weight and convenient maintenance.
4 good sealing performance
5 is not limited by the installation direction, the flow of media can be arbitrary.
6 no vibration, little noise.


The main disadvantages are as follows:
According to the structure,sanitary ball valves can be divided into: floating ball valve, ball valve and oil seal ball valve; according to the channel, it can be divided into straight energy, angle and three general formulas, the three general formulas, it can be divided into T and L shape. According to the connection, it can be divided into three types such as threaded connections, flange connections and welding.

Ball valve installation and maintenance should pay attention to the following matters:
1 to leave the valve handle rotation position
2 cannot be used as throttling.
3 ball valve should be installed upright with transmission mechanism.

Ball Valve Seat Structure Principle

Ball valve seat structure principle
1, the main function of the ball valve is to cut off or connect the fluid channel in the pipeline. The principle of the ball valve is driven by the device at the upper end of the valve stem to apply a certain torque to the ball, so that the rotation angle is 90 degrees, the opening or closing the valve action was completed.

The valve seat sealing principle according to the structure of the valve seat structure varies, Adamant valves used fixed and floating seat fixed seat floating sphere. When the valve seat is fixed to floating ball, the ball body displacement in the direction of fluid flow under pressure, the valve seat and valve sealing it after closer contact, in which the sealing pressure increases on the surface, to form a single seal, at the same time, in front of the valve seat sealing surface than the pressure should be reduced, often do not guarantee seal. When the valve seat floating ball is fixed, the fluid pressure can not make the ball displacement, but the seat by means of a spring or fluid pressure to push the ball, the establishment of sealing pressure.

food valve

2, structure
2.1, soft sealing seat
(1) General
Ordinary seat is characterized by the pretightening force or fluid pressure under the valve seat and ball pressing, and the valve seat material elastic-plastic deformation to seal, the sealing effect depends on the valve seat in fluid pressure or under the effect of preload compensation of ball roundness and surface micro roughness ability. Therefore, the valve seat and the ball must be large enough to seal the pressure.


(2) Elastic
The elastic seat with the help of elastic components, such as metal spring frame and spring, elastic deformation in the pretightening force or fluid pressure, affect the sealing performance of the ball to compensate for variations in temperature, pressure and wear conditions.

3, conclusion
Valve seat and seal ring is the key component of sanitary ball valve. Adamant valve that the sealing ring should have excellent stability, friction coefficient is small, not easy to aging, good sealing performance. Valve seat should have a certain strength and stiffness, the gap is moderate, not easy to deformation under pressure. Metal sealing valve seat should meet the functions such as high temperature, high pressure, strong corrosion, ultra low temperature, zero leakage, long life, fire safety and pressure resistance.

Butterfly Valve Test and Installation

Butterfly valve test and installation
Test and adjustment
1, the product either manual, pneumatic, hydraulic, electrical components in the factory are subject to stringent testing, sealing in the re examination, the import and export should be uniform on both sides of the fixed, closed butterfly valve, pressure on the import side, there is no leakage phenomenon observed in the export side, before the experiment, we should open the disc plate, to prevent damage to the sealing.
2, although the factory before the strict inspection and testing, but also the existence of individual products in transit automatic screw displacement, need to re adjust, pneumatic, hydraulic, etc., please read the supporting device manual.
3, the electric drive butterfly valve control mechanism has a good close travel adjustment. In order to prevent the power supply connected to a wrong direction, the user first switched on, first open the manual to check in half open position, press the power switch indicator direction and the valve can be closed in the same direction.


Common fault and elimination method
1, verify whether the installation of factory product performance and medium flow arrow with the movement condition before, and clean the valve plug cavity, the sealing ring and the butterfly board with foreign impurities not allowed, no pre cleaning must not allowed to close the disc, so as not to damage the sealing ring.
2, disc plate supporting flange is recommended to install special flange butterfly valve.
3, installed in the pipeline in the position, the best position for vertical installation, but can not flip.
4, the use of the need to adjust the flow, there are worm gear box control.
5, sanitary butterfly valves can be opened the worm wheel cover, check whether the normal butter should maintain the right amount of butter.
6, check the connection part of the press, that is to ensure that the packing of the bees, but also to ensure flexible stem rotation.
7, metal sealing butterfly valve products are not suitable for installation at the end of the pipeline, such as must be installed at the end of the pipeline, need to be equipped with outlet flange, to prevent the backlog of seals.
8, using the valve stem to install the reaction regularly and check the use of the valve, found in time troubleshooting.

Advantages and Disadvantages of Butterfly Valve

Advantages and disadvantages of butterfly valve
Butterfly valve has the following advantages:
1 opening and closing fast and convenient, labor-saving, fluid resistance is small, you can often operate.
2 simple structure, small size, light weight
3 can transport mud, at the mouth of the pipeline accumulation of liquid at least.
4 low pressure, can achieve a good seal.
5 good adjustment performance

The features of butterfly valve is as follows:
1 pressure and working temperature range.
2 poor sealing
Butterfly valve structure can be divided into the form of bias plate, vertical plate, inclined plate and lever type. According to the seal, it can be divided into two types of seal and hard seal. Generally, the soft sealing ring is made of rubber ring.
According to the type of connection, it can be divided into flange and clamp type connection; according to the transmission mode can be divided into manual, gear transmission, pneumatic, hydraulic and electric.

Sanitary butterfly valve is used in food and beverage industry as fluid equipment
Sanitary butterfly valves are used in the connection and control of fluid and semi-fluid material conveying pipes in food and beverage industry, because they are made of stainless steel, so they can effectively guarantee the hygienic quality of the materials in the process of transporting, but is also easy to clean and disinfect to keep the pipes clean and hygienic.

What is Clip Type Hard Seal Butterfly Valve

Wafer type hard sealing butterfly valve has J shaped elastic precision of the sealing ring and the three eccentric multi-level metal seal structure, is widely used in medium temperature of 425 DEG C, petroleum chemical industry, metallurgy, electric power and water supply and drainage and municipal construction and other industrial pipelines, adjust the flux and set off fluid.


Product advantage
1, the clamp type hard seal sanitary butterfly valve has three eccentric seal structure, seat and butterfly plate almost has no wear and tear, with the more tight sealing function.
2, the sealing ring is made of stainless steel, has the dual advantages of sealing such as corrosion resistant, long service life etc., both in low and high temperature conditions, both with excellent sealing performance.
3, butterfly plate sealing surface has cobalt based alloy carbide, sealing surface is featured by wear resistance, long service life

4, large format discussing lattice structure, high strength, large flow area, flow resistance is small
5, the clamp type hard seal butterfly valve with two-way sealing function, the installation is not limited by the flow of media, is not affected by the location of the space, can be installed in any direction
6, the driver can be multi station (rotating 90 degrees or 180 degrees) installation, user-friendly.

Butterfly Valve Processing Technology

According to the analysis of the importance of characteristics of the valve parts, the key technology and quality assurance is in different parts of the requirements, strict implementation is ISO9001-2008 standards and establish perfect quality assurance system, in the production process, in strict accordance with the national requirements for the production of pressure pipeline manufacturing.


1 pressure casting: in order to ensure the surface quality of castings, meet MSS SP55 standard requirements of molding sand quality and other technology standard of our factory, the casting defects of the parts used the riser or placed cold iron, the quality assurance personnel witness consent, be ready to cast blank. In the cast steel water smelting, shall be carried out by infrared spectroscopy for inspection before furnace, when the chemical composition meet the standard requirements, can casting parts, after heat treatment, with the light ray inspection process. And the 1 / 4 of the anatomy is the blank, check the hot junction of slag, porosity, shrinkage, sand, cracks and other casting defects, after passing the test, can be put into mass production.

2 welding process evaluation: the welding of various materials should be process evaluation, evaluation criteria are fully in line with the requirements of ASME standards, qualified by the authority, to determine the welding process of such materials.


3 The sealing surface of welding materials: according to the project requirements, our factory used plasma spraying technology, the base material was put into the hard alloy welding implement sealing surface, so met the alumina sanitary butterfly valve industry requirement such as low maintenance and high reliability requirements.

4 key parts of the body size and shape tolerance, high precision and electric device adopting the unified standards, a positioning and clamping all machining finished in our factory four inversion processing center, ensure the machining precision of the parts, in accordance with the technical documentation requirements.

5 seat special process: using external thread positioning processing seat sealing surface at both ends, to ensure the sealing surface of the valve seat, layer thickness and size is precision, to ensure the accuracy of the wedge angle with the valve assembly, in line with technical documentation requirements.

6 valve seat hole processing: increasing the process weight, eliminating the imbalance in the machining process, to ensure the accuracy of the valve seat hole, surface roughness and shape and position tolerance to meet the technical documentation requirements.

7 stem trapezoidal thread used a high-precision machine tools for high speed low feed cutting. In order to ensure the processing efficiency, ensure the accuracy of the process to meet the technical documentation requirements. Moreover, the special technology of applying the rapid jump knife is adopted. The valve stem is processed without a knife groove, which is easy to meet the strength requirements of the API591 standard.

8 sealing surface grinding: cone sealing surface used imported grinding machine in Italy, so that the grinding line can meet the requirements of diamond mesh.

9 key welding and heat treatment process: automatic spray welding of multilayer Stellite cobalt based alloy coating, ensure size to meet the requirements. And through the heat treatment to ensure that the sealing surface is the specified technical indicators, and the sealing surface of the hardness is each point uniform.

Stainless Steel Three Way Ball Valve

Three way ball valve has T and L types. The T type can make the three orthogonal pipes connect with each other and cut off the third channels. Two pipeline L three ball type valve can only be connected mutually orthogonal, communicating with each other while maintaining the third pipeline, only as a distribution function.


Product advantage
1 fluid resistance is small, and its resistance coefficient is equal to the length of the pipe section.
2 simple structure, small size, light weight.
3 close and reliable, good sealing, in the vacuum system has also been widely used.
4 easy operation, open and close rapidly, from fully open to fully closed as long as 90 degree rotation, facilitate remote control.
5 easy maintenance, ball valve structure is simple, seals are generally active, disassembly and replacement are more convenient.
6 in the fully open or fully closed, the ball and valve seat sealing surface and the dielectric isolation, the medium through, will not cause erosion of the valve sealing surface.
7 a wide range of applications, from small to a few millimeters in diameter, up to a few meters from the high vacuum high pressure can be applied.
Sanitary ball valve can be divided into straight through, three and right angle according to its channel position. The two ball valve can be used for the distribution of media and change the flow of media.


Product features
1 to leave the valve handle rotation position.
2 cannot be used as throttling.
3 ball valve transmission mechanism should be installed upright.
Three way ball valve works by rotating the valve to make the valve flow or occlusion. Valve is featured by switch light, small size, can be made large caliber, reliable sealing, simple structure, easy maintenance, sealing surface and spherical often in the closed state, the media can not easily be eroded, widely used in various industries.

Three way ball valve is mainly used for cutting in the pipeline, distribution and change the direction of the flow of media.

Three way ball valve is a new type of ball valve, it has its own unique advantages of the structure, such as the switch without friction, seal is not easy to wear, opening and closing torque is small. This reduces the size of the actuator. Equipped with multi turn electric actuator, can adjust the medium and cut off tightly. It is widely used in petroleum, chemical industry, urban water supply and drainage, etc..