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Types of valve accessories

September 25, 2020

Types of valve accessories: The valve itself is composed of a valve body and various operating mechanisms, which also contain many parts and accessories, including manual, pneumatic, electric and so on. The components assembled in different ways of use are also different.
Valve accessories mainly include:
1. Pneumatic actuator: It is mainly divided into single-acting and double-acting. Single-acting is a spring-return

ductile iron, DI, butterfly valve, manufacturer, center line, TH valve

structure, and double-acting is the principle of air opening and closing. Generally, double-acting pneumatic actuators are used for adjustment types. 2. Electric actuators: the common ones are linear, angular, compact and explosion-proof. The structure of the electric actuator is relatively complex and the cost is high, but its performance is stable, open and close quickly, and it is suitable for remote control systems.
3. Hydraulic actuator: A hydraulic actuator is a device that converts hydraulic energy into mechanical energy. There are mainly linear and rotary types. The cost is relatively high and the structure is relatively complex. It is a product with special working conditions and high requirements, and the market generalization rate is low.
4. Gas-liquid linkage actuator: The gas-liquid linkage actuator uses pipeline natural gas or nitrogen as power and hydraulic oil as the transmission medium to drive the opening and closing of pipeline valves. It is mainly used as a multifunctional driving device in natural gas, liquefied gas, nitrogen, gas liquid tank, gas, etc.
5. Electro-hydraulic linkage actuator: The electro-hydraulic linkage actuator is composed of a control module and a power module. The intelligent controllable motor accepts the function commands of the control module, controls the power module, and outputs the large distance in line or angular displacement, pneumatic control The object, at the same time, completes the adjustment process through its own displacement feedback, and realizes various functional controls.
6. Manual actuator: The manual actuator is to perfect the manual control when the current is unstable and the air pressure is insufficient. When the air pressure and current cannot be controlled under special circumstances or there is no current and air pressure for installation and maintenance, the manual feedback device can be turned on, which can be carried out quickly Manual control.

Valve components:
Handle, handwheel, worm gear, valve body, valve core, valve stem, valve cover, valve silencer, blank, bolt and nut, clamp, spring, diaphragm, packing, packing, O-ring, PTFE products Gaskets, flanges, non-standard solid parts, etc.
Positioner and accessories:
Pneumatic valve positioner, electric valve positioner, intelligent valve positioner, electro-hydraulic server, servo amplifier, electric converter, filter pressure reducing valve, valve position transmitter, position valve, solenoid valve, limit switch, pneumatic Amplifier, smart module, electro-hydraulic server, servo amplifier, alarm, explosion-proof coil, quick exhaust valve
Other valve accessories:
Valve testing machine Handle Handwheel Worm gear valve Body Valve core Valve cover Valve silencer Signal generator Rough mold bolts and nuts Clamps Springs Diaphragm Packing O-rings Flow juice Polytetrafluoroethylene products Gaskets Flanges Fast elbows Joint expander Flow meter Filter non-standard solid parts

TH Valve is a professional manufacturer of butterfly valve, gate valve, check valve, globe valve, knife gate valve, ball valve with API, JIS, DIN standard, used in Oil, Gas, Marine industry, Water supply and drainage, fire fighting, shipbuilding, water treatment and other systems, with Nominal Diameter of DN50 to DN1200, NBR/EPDM/VITON, Certificates & Approvals: DNV-GL, Lloyds, DNV, BV, API, ABS, CCS. Standards: EN 593, API609, API6D

Working principle diagram of three-way valve

September 25, 2020

What is a three-way valve? Simply put, a three-way valve has three inlets and outlets; when the three-way merges, there are two in and one out, and the three-way split is one in and two out. It is controlled according to the shape of the spool. The most obvious difference in appearance between a three-way valve and a two-way valve is one more flow passage. The three-way valve is mainly used to change the flow direction of the medium. In addition to the inlet A, the outlet B, and the reversing port C, ordinary valves do not have the function of changing the flow direction of the medium.

T, L type port valve

Three-way valve structure: Three-way valves are generally divided into L-type and T-type. The T-shape can connect three orthogonal pipelines with each other and cut off the third channel, which can split and merge. The L shape can only connect two orthogonal pipes, and cannot maintain the third pipe to communicate with each other at the same time. It only plays a role of distribution.
Principle of three-way valve:
When the valve opens, the medium enters the valve from A, and flows out of the valve through B. When the bypass requires medium to flow in, the actuator is opened, the valve core is reversed, and medium A enters C out. When the pipeline does not require medium to flow in, the actuator is opened and the valve close Cut off the media.
Three-way solenoid valve:
There are several working positions of the spool. The solenoid valve is called several solenoid valves: the interface on the valve body, which is the number of passages of the solenoid valve, has several passage ports, and the solenoid valve is called a few-way solenoid valve, which means two Position means that there are two working positions that can be switched, and the three-way has three channels for ventilation.
Two-position, two-way, two-position, three-way solenoid valve principle The solenoid valve is one in and one out (two channels); one channel is connected to the air source, and the other channel is connected to the air inlet of the actuator;

Three-way solenoid valve

The two-position three-way solenoid valve controls the gas to be one inlet, one outlet and one exhaust (there are two working positions); one channel is connected to the air source, the other two channels are connected to the air inlet of the actuator, and one Adjacent to the exhaust port of the actuator;
The two-position five-way solenoid valve controls the gas to be one inlet, two outlets and one exhaust (the working position is also two); 1 air inlet (connected to the air source), 1 positive action vent hole and 1 * as a vent hole (Separately provide the target equipment with one positive and one* air source), 1 positive action exhaust hole and 1 *exhaust hole (installation*);
The three-position five-way solenoid valve controls the gas to be one in, two out and one exhaust (but there are three working positions); 1 air inlet (connected to the air source), 1 positive action vent hole and 1 * as a vent hole (Separate the air source provided for the target equipment in one positive and one *), 1 positive action vent and 1 ** vent (installation*).
Principle of three-way solenoid valve:
One in and one out: Normally closed (ZC2/3)—When the solenoid valve coil is energized, port 2 leads to port 1, and port 3 is closed; when the solenoid valve coil is de-energized, port 2 is closed and port 1 leads to Port 3; Normally open (ZC2/3K) When the solenoid valve coil is powered off, port 3 leads to port 1, and port 2 is closed; when the solenoid valve coil is energized, port 3 is closed, and port 1 leads to port 2;
One input and two output: (ZC2/31) When the solenoid valve coil is energized, the first circuit of the medium outlet (2) is opened and the second circuit (3) is closed; when the solenoid valve coil is de-energized, the first circuit of the medium outlet is closed. (2) Close, the second way (3) opens;
Two in and one out: (ZC2/32) When the solenoid valve coil is energized, the first circuit (2) of the medium inlet is opened, and the second circuit (3) is closed; when the solenoid valve coil is de-energized, the first circuit of the medium inlet (2) Close, and the second way (3) opens; (Check valves must be added before the two inlet ends of the inner valve)

World Famous Valve Brand Ranking

September 24, 2020

If you talk about trusted brands abroad, different valves have different manufacturers, and each imported valve

ductile iron, DI, butterfly valve, manufacturer, center line, TH valve

company is involved in different fields, and each brand has its own advantages. The explanation for imported valve brands is to let users know more about imported valve brands. It is a comprehensive selection based on the brand awareness, quality level, after-sales service, innovation ability, consumer reputation and other indicators of each imported valve company. Customers can help when purchasing imported valve products.
FISHER Fisher valve (USA), According to different requirements, Fisher valve adopts American ANSI/API, British BS, Japanese JIS, German DIN, national standard GB and other standards for design, manufacture and inspection. The main products are soda ash special valve, ceramic ball valve, clay valve, oxygen special valve, pneumatic/electric control valve, self-operated control valve, metal hard seal ball valve, high temperature butterfly valve, air separation system butterfly valve, disc valve, metal hard seal butterfly valve, thick Special valves for nitric acid, ball valves, globe valves, check valves, flat gate valves, power station valves and non-standard special valves.

Masoneilan Valve (United States), In the field of valve control, Masoneilan has set a number of firsts: the first to develop a design concept that greatly simplified the valve diameter; the first to develop the top guide and bottom guide technology of the control valve; First developed the first universal control valve (Camflex); first invented a method to reliably predict the noise during the calculation and design of the control valve.
kitz Kitzawa Valve (Japan), Kitz Kitzawa Valve (Japan) was founded in 1951 and has become one of the world’s leading integrated valve factories. The company not only produces valves for general equipment and various industrial complete sets of equipment, but also produces valves for automatic operation and testing equipment. In Beize, from casting, forging processing to assembly, serial production is carried out under strict quality management. In addition, when leaving the factory, the products are strictly inspected in accordance with the “Quality Assurance Regulations” formulated by the company, so they are well received by users all over the world.
HANK Hank Valve (Germany), HANK Hank Valve was founded in Mönchengladbach in 1852. Hank Valve is a multinational production company that is famous for producing high-quality, advanced valves, measurement and control systems. It has subsidiaries and branches in dozens of countries around the world. The main products are pneumatic valves, water supply and drainage valves, hydraulic ball valves, cryogenic valves, high temperature and high pressure valves, imported butterfly valves, imported plug valves, imported stop valves, hydraulic ball valves, imported needle valves, imported ball valves, etc.
OTTO Valve (France), The French OTTO Valve Company was established in Paris, France in 1805 and has a history of more than 100 years. At the beginning of its establishment, France OTTO Valve was only a stainless steel valve manufacturer, but now France Otto is one of the top 500 companies in the Midwest of France, with 15 manufacturing centers in the United States, Germany, the United Kingdom and Italy. Among them, 10 manufacturing centers have passed ISO9001 quality certification, and their products cover a variety of fields in the fluid control industry.
KSB Valve (Germany), Germany KSB is a world-renowned modern large company that manufactures pumps and valves. It is one of the three largest pump and valve manufacturing companies in the world. Founded in 1871, it is an international company directly managed by the headquarters. There are six factories in Germany and France. The main products of KSB in Germany include: globe valves, filters, ball valves, gate valves, traps, butterfly valves and other general valves.

Danke Valve (United States), Danke Group is the world’s leading supplier of fluid control products and services. Products designed and manufactured are used in various industrial and general commercial applications. Since its establishment for nearly a century, more than 300 dedicated engineers have continuously developed high-quality valves and accessories to meet different market needs. All products are completed under a strict quality system that complies with the ISO9001 international standard. Danke products and distributors are located in 43 countries around the world. The main products are: ball valves, gate valves, check valves, butterfly valves, etc.
ARI Valve (Germany), ARI Valve was founded in 1952 and is headquartered in STUKENBROCK, Germany. ARI has three factories in Germany. The total output of valves is second to none in Germany. The products cover four series of globe valves-safety valves-control valves-traps. In the past 50 years, German iResearch Valve has been committed to providing comprehensive technology and perfect services for industrial processes, process, chemical, shipbuilding and building automation fields, which can meet the needs of system cutoff, safety, control and Hydrophobic function requirements.
SpiraxSarco Valves (UK), SpiraxSarco Valves SpiraxSarco, UK, is committed to promoting the effective application and control of steam and other industrial fluids on a global scale. It has a history of more than 100 years. The history of SpiraxSarco Valve Company can be traced back to 1888. It was established in the United Kingdom in 1937. In 1959, SpiraxSarco Valve Group Company was listed on the London stock market and has outstanding performance reports every year.
Dongguang Valve (Taiwan), In 1962, Dongguang Faner Industrial Co., Ltd. was reorganized and moved to Hami Street, Taipei, covering an area of approximately 1,650 square meters, and adding semi-automatic casting equipment. It has a history of 60 years. Later, due to business development needs, Shenzhen Dongguang Faner Valve Co., Ltd. was officially registered in the mainland in 2010.

TH Valve is a professional manufacturer of butterfly valve, gate valve, check valve, globe valve, knife gate valve, ball valve with API, JIS, DIN standard, used in Oil, Gas, Marine industry, Water supply and drainage, fire fighting, shipbuilding, water treatment and other systems, with Nominal Diameter of DN50 to DN1200, NBR/EPDM/VITON, Certificates & Approvals: DNV-GL, Lloyds, DNV, BV, API, ABS, CCS. Standards: EN 593, API609, API6D
URL: http://www.tanghaivalve.com
Name: Harry Li
Email: harry@tanghaivalve.com

Types and working principles of electric valves

September 18, 2020

The so-called electric valve, as its name implies, is to drive the opening and closing of the valve through the power

U type flange butterfly valve (6)

supply. It is mainly composed of two parts. The upper part is an electric actuator and the lower part is a valve. In industrial processes, it is used to control the travel and flow of various fluids, such as water, oil, chemical liquids, etc., based on parameters such as temperature, pressure and flow. Electric valve is a kind of self-control valve that has been widely used in recent years. With its stable reliability and multiple control functions, it can meet the requirements of most common valves that cannot be used. It has become an indispensable control device in the process pipeline.
Electric ball valve; Electric regulating valve; Electric butterfly valve;
The electric valve has a simple structure and a long service life. It is suitable for almost all media and can greatly reduce the labor intensity of the operator. It is suitable for equipment where it cannot be manually operated or is difficult to approach. It can complete remote operation of the valve, and the height of the equipment is not restricted.
Types and classifications of electric valves:

electric stainless steel gate valve

1. According to different actuators, electric valves are generally divided into two categories, one is angular stroke, the other is linear stroke, angular stroke electric valve controls 90 degree rotation to achieve the on and off of the valve, and linear stroke realizes the valve plate. The up and down actions are usually used in conjunction with equipment with a higher degree of automation.

2. According to the function, it can be divided into switch type and regulation type, intelligent type and explosion-proof type; the switch type is fully open and fully closed, and the regulation type can control any opening degree to achieve the function of adjusting the flow rate!

3. According to the valve position, it can be divided into common electric ball valves, electric butterfly valves, electric regulating valves, solenoid valves, electric gate valves, electric shut-off valves, etc., which can be applied to various occasions.

4. According to the shape of the valve body, it can be divided into ordinary electric valve and micro electric valve. The working principle of the electric valve: The electric valve is connected by the electric actuator and the valve. After installation and debugging, the valve is driven by the power supply to realize the opening and closing action of the valve, so as to achieve the purpose of switching or adjusting the pipeline medium. The opening degree of the electric valve can be controlled, and the state is open, closed, half-open and half-closed, which can control the flow of the medium in the pipeline, but the solenoid valve cannot meet this requirement.

Solenoid valve is a type of electric valve, which uses the magnetic field generated by the solenoid coil to pull the valve core, thereby changing the on and off of the valve body, the coil is de-energized, and the valve core retreats by the pressure of the spring.

TH Valve is a professional manufacturer of butterfly valve, gate valve, check valve, globe valve, knife gate valve, ball valve with API, JIS, DIN standard, used in Oil, Gas, Marine industry, Water supply and drainage, fire fighting, shipbuilding, water treatment and other systems, with Nominal Diameter of DN50 to DN1200, NBR/EPDM/VITON, Certificates & Approvals: DNV-GL, Lloyds, DNV, BV, API, ABS, CCS. Standards: EN 593, API609, API6D

Valve flow characteristic curve and classification

September 18, 2020

The flow characteristic of the valve is the relationship between the relative flow of the medium flowing through the regulating valve and its opening under the condition that the pressure difference between the two ends of the valve remains constant. Flow characteristic is an important technical index and parameter of regulating valve. It is very important to make the correct selection in the application process of the control valve.

Flow characteristics of regulating valve

Valve flow characteristics can be defined as: the relative flow of the controlled medium flowing through the valve, and the relationship between the relative opening (relative displacement) of the valve is called the flow characteristics of the regulating valve. Generally speaking, it is divided into four types: straight line, equal percentage (logarithm), parabola and quick opening! The specific description and advantages are as follows:

1. The linear characteristic refers to the linear relationship between the relative flow of the valve and the relative opening, that is, the time constant of the flow change caused by the change of unit opening. The relative stroke of the linear characteristic is linear with the relative flow. The flow change caused by the change of unit stroke is constant. When the flow is large, the relative value of the flow changes little, and when the flow is small, the relative value of the flow changes greatly.

2. the equal percentage characteristic (logarithm) means that the relative flow change caused by the change of the unit opening is proportional to the relative flow at that point, that is, the amplification factor of the regulating valve changes, and it increases with the increase of the relative flow. The relative stroke and relative flow of equal percentage characteristics are not in a linear relationship. The change in flow caused by the change of unit stroke at each point of the stroke is proportional to the flow at this point, and the percentage of flow change is equal. Therefore, its advantage is that when the flow rate is small, the flow rate changes small, and when the flow rate is large, the flow rate changes greatly, that is, it has the same adjustment accuracy at different opening degrees.

3. the parabolic characteristic means that the relative flow change caused by the change of the relative opening of the unit is proportional to the square root of the relative flow value at this point. The flow rate changes in proportion to the two sides of the stroke, and generally has an intermediate characteristic between linear and equal percentage characteristics.

4. the quick opening flow characteristic means that there is a larger flow when the opening is small. With the increase of the opening, the flow can reach the maximum quickly, and then the opening is increased, and the flow change is small, so it is called For quick opening characteristics.

The flow characteristic of the diaphragm valve is close to the quick opening characteristic, the flow characteristic of the butterfly valve is close to the equal percentage characteristic, the flow characteristic of the gate valve is the linear characteristic, the flow characteristic of the ball valve is linear in the middle opening and closing stage, and the equal percentage characteristic in the middle opening.

Globe valve (9)

Under normal circumstances, ball valves and butterfly valves are usually not used for adjustment. If they are used for adjustment, they are only used for adjustment when the opening is small. Generally, they can be classified as quick-opening, and they are really used for adjustment. Most of them are basically cut-off valves (globe valve). The valve head is processed into a parabolic cone, spherical shape, etc., and different curve characteristics are used. Generally speaking, as an adjustment, the basic percentage characteristic is used more.

TH Valve is a professional manufacturer of butterfly valve, gate valve, check valve, globe valve, knife gate valve, ball valve with API, JIS, DIN standard, used in Oil, Gas, Marine industry, Water supply and drainage, fire fighting, shipbuilding, water treatment and other systems, with Nominal Diameter of DN50 to DN1200, NBR/EPDM/VITON, Certificates & Approvals: DNV-GL, Lloyds, DNV, BV, API, ABS, CCS. Standards: EN 593, API609, API6D

installation principle and setting of the bypass valve

September 17, 2020

Whether the valve needs to be installed with the principle and setting of the bypass valve.
We occasionally see relatively large valves in some pipelines and always install bypass valves. Why is this? What is its main function? Under what circumstances does it need to be installed? And what is the size of the bypass valve of the corresponding equipment?

bypass valve installation

In fact, by setting a bypass valve in the pipeline, its role can be divided into two major points in general: one is to protect (balance the pressure at both ends), and the other is to make emergency use!
First, the protective effect can also be said to be a protective measure for the main valve to prevent the large opening resistance caused by the excessive pressure difference between the front and rear of the valve and the difficult opening of the valve, especially in some large diameter or high pressure pipeline. Before the high-pressure pipeline is opened, the pressure is released through the bypass valve to avoid the sudden influx of high pressure and impact on the pipeline below the valve. Or the pressure difference between the two ends of the valve is too large, and the opening torque is too large. In order to avoid torsion damage to the valve, the valve should be opened after bypassing and releasing the pressure.

butterfly valve and bypass valve

Second, the emergency function, used as a backup pipeline, the biggest advantage is that when the main valve fails or needs maintenance, it can flow through the bypass valve without affecting normal production.
Whether the valve needs to be installed with the specific requirements and settings of the bypass valve: (for reference only)
2.5MPa level, above DN400; 4.0MPa level, above DN250; 6.4MPa level, above DN200; 10MPa level, above DN150; For valves from DN100 to DN200, the bypass pipe and bypass valve are DN20;
For valves from DN250 to DN600, the bypass pipe and valve are DN25; for valves above DN600, the bypass pipe and valve are DN40.

TH Valve is a professional manufacturer of butterfly valve, gate valve, check valve, globe valve, knife gate valve, ball valve with API, JIS, DIN standard, used in Oil, Gas, Marine industry, Water supply and drainage, fire fighting, shipbuilding, water treatment and other systems, with Nominal Diameter of DN50 to DN1200, NBR/EPDM/VITON, Certificates & Approvals: DNV-GL, Lloyds, DNV, BV, API, ABS, CCS. Standards: EN 593, API609, API6D

The difference of cryogenic valve and ordinary temperature valve

September 17, 2020

Cryogenic valves, as the name implies, are valves that can work in cryogenic and cryogenic conditions. The operating temperature is demarcated. Valves with operating temperatures below -40°C are usually called cryogenic valves, which are mainly used for gas liquefaction, For separation, transportation and storage equipment, the operating temperature can reach below -270℃. Currently, there are butterfly valves, check valves, gate valves, globe valves, ball valves, and throttle valves.

In recent years, ultra-low temperature valves have been used more and more widely, and they are one of the

lug type butterfly valve, ductile iron, center lined,

indispensable important equipment in petrochemical, air separation, natural gas and other industries. The working medium is not only low in temperature, but most of them are toxic, or flammable and explosive. , And strong permeability, so it determines many special requirements for valve materials and design. It is not only required to work normally at the set temperature, but also to ensure the working performance at room temperature.

Compared with the normal temperature valve, the low temperature valve has a higher packing part and uses an extended stem. Its purpose is to reduce the heat transferred from the outside into the device; to ensure that the temperature of the stuffing box is above 0℃, so that the stuffing can work normally; to prevent the valve stem and the upper part of the valve cover at the stuffing box part from being too cold The parts are frosted or frozen.

The design of the long-neck bonnet is mainly the design of the neck length L. L refers to the distance from the bottom of the stuffing box to the upper surface of the upper sealing seat. It is related to the thermal conductivity of the material, the thermal conductivity area, the surface heat dissipation coefficient, and the heat dissipation area. , The calculation is relatively cumbersome, and it is generally obtained by experimental methods.

Ferritic stainless steel can be used when the temperature is higher than -100℃, austenitic stainless steel can be used when the temperature is lower than -100℃, copper alloy or aluminum alloy can be used for low pressure and small diameter valves, and the valve body should be able to withstand temperature changes sufficiently. The expansion and contraction, and the structure of the valve seat part will not be permanently deformed due to temperature changes.

Valve installation instructions and process precautions

September 17, 2020

Valve is a kind of mechanical product that is widely used in the construction of national economy. In the current market, the more commonly used valve types are butterfly valves, check valves, ball valves, globe valves, gate valves and regulating valves. For the correct installation method of the valve, the user should understand the following introduction.

ductile iron, DI, butterfly valve, manufacturer, center line, TH valve

1. Valve installation
Valves should generally be positioned before pipeline installation. The piping should be natural, and the position should not be hard to avoid leaving pre-stress. During installation, it is recommended to install with a lifting ring. When installing with a chain, pay attention to protective measures for the outer coating of the valve. When the valve is equipped with a bracket or transmission mechanism, the sling should be fixed on the valve hoist ring, and the sling should not be placed on the transmission mechanism; the sling or hoisting chain should not squeeze the external parts of the valve and its extension rod to avoid damage to the valve actuator , Causing the valve to be unable to switch or difficult to switch.

2. Welding of the valve

double plate check valve body

(1) After the valve is in place, the valve should be placed in the fully open position when preheating and welding the valve, otherwise, during the welding process, the ball of the ball valve and the gate plate of the gate valve will be stained with welding slag and put into production At this time, these attached welding slag will scratch the valve seat seal and cause internal leakage of the valve. In severe cases, the valve will fail.
(2) The valves must be supported on their respective bases or separately.
(3) After the valve is welded, if the valve needs to be rotated, a manual grease gun should be used to fill in grease. (4) Confirm that the sewage outlet and pressure outlet are closed.
(5) General ball valve installation has no directionality, but attention should be paid to the position of the operating side. Some ball valves are directional when installed, so they must be installed in accordance with the arrow mark on the valve body and cannot be reversed. For example, the inlet and outlet sides of some of the ball valves of the crude oil and product oil yards of the Western Pipeline use two types of valve seat sealing, one end uses a double piston effect valve seat, and the other end uses a self-draining seal valve seat. If installed in reverse, After commissioning, the valve will automatically release the pressure and a pipeline accident will occur.

3. Requirements after valve welding
(1) The valve should be filled with grease before pressure test after welding to ensure that the sealing surface of the valve is filled with grease, and the impurities attached to the sealing surface of the valve seat during welding are discharged with grease.
(2) Check the condition of the valve to ensure that all external joints are locked and not loose; confirm that the sewage outlet and pressure outlet are in a tightly locked state to prepare for pressure test.
(3) Operate the valve according to the pressure test plan and keep the valve in the specified position.
A valve is a device used to control fluid flow, pressure and direction. The fluid to be controlled can be liquid, gas, gas-liquid mixture or solid-liquid mixture. In oil, natural gas, coal, metallurgy and ore mining, processing and pipeline transportation systems; in petrochemical, chemical products, medicine and video production systems; in hydropower, thermal power and nuclear power generation systems; in urban construction In water supply and drainage heating and gas supply systems; in metallurgical production systems; in fluid systems of ships, vehicles, aircraft, aerospace and various sports machinery; in national defense production and new technology fields; in agricultural irrigation and drainage systems,, A large number of new varieties of valves are used.

Commonly used valve body material code description

September 17, 2020

Valve body material code description:

lug type butterfly valve body

The material of the valve body should first consider the physical properties (temperature, pressure) and chemical properties (corrosiveness) of the working medium. At the same time, you should also understand the cleanliness of the medium (with or without solid particles). In addition, it is necessary to refer to the relevant regulations and requirements of the country and the user department. Different valve body materials can meet the requirements of the valve in a variety of different working conditions. Correct and reasonable selection of valve materials can obtain the most economical service life and best performance of the valve.

code	valve body
Z	grey cast iron
T	copper and copper alloy
C	carbon steel
K	Malleable cast iron
Q	ductile cast iron
I	Chrome-molybdenum steel: 1Cr5Mo ZG1Cr5Mo
P	18-8series SS: Cr18Ni9Ti, ZG1Cr18Ni9Ti
R	1Mo2T series SS: Cr18Ni12Mo2Ti, ZG1Cr18Ni12Mo2Ti
V	Chrome Molybdenum Vanadium Steel:12Cr1Mo1V, ZG12Cr1Mo1V
S	plastic
L	aluminium alloy
H	Cr13 series SS
A	Titanium and Titanium alloy

Note: Gray cast iron valves with Pg≤16kgf/cm2, carbon steel valves with Pg≥25kgf/cm2, omit this code. Different valve models are suitable for different pressure levels. Therefore, when selecting the valve body material, the valve body material suitable for the working conditions should be determined according to different uses and different pressure levels.

Code of valve sealing or lining material

September 16, 2020

The sealing surface of the valve mainly refers to the contact surface of the valve disc and the valve seat. The sealing

marine valve seat

element plays the role of cutting off and connecting, adjusting and distributing, separating and mixing the medium on the valve passage, and improving the quality and service life of the valve sealing surface. Appropriate sealing surface materials and reasonable sealing structure must be selected. Valve sealing ring materials are mostly mixed materials, and seals of different components have different effects. When selecting valves, customers should choose corresponding seals according to the actual conditions of the medium, temperature and pressure.

code	sealing material/lining material
T	Copper alloy
X	Rubber
N	Nylon plastic
F	Fluoroplastic
B	Babbitt alloy
H	Alloy steel
D	Nitrided steel
Y	Hard alloy
J	Lining
Q	Lead lining
C	Enamel
P	Boronized steel

Note:

1. The code of the valve seat sealing material directly processed by the valve body is coded by “W”.
2. When the sealing materials of the valve seat and the valve disc (valve plate) are different, it is indicated by the code of low hardness material (except for diaphragm valves).

Types of valve accessories

Working principle diagram of three-way valve

World Famous Valve Brand Ranking

Types and working principles of electric valves

Valve flow characteristic curve and classification

installation principle and setting of the bypass valve

The difference of cryogenic valve and ordinary temperature valve

Valve installation instructions and process precautions

Commonly used valve body material code description

Code of valve sealing or lining material

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