Check valve is the fluid can only flow along the inlet, the outlet medium but can not return, commonly known as one-way valve. Used in hydraulic systems to prevent reverse oil flow, or used in pneumatic systems to prevent reverse flow of compressed air. Check valve has straight-through and right-angle type two kinds. Straight-through check valve with threaded connections installed in the pipeline. Right-angle check valves have threaded connections, plate connections and flange connections in three forms.
As a Chinese check valve supplier with a variety of international certifications and praise from customers, we produce high performance check valve series products and also customized solutions to meet valve operating conditions and manufacturing standards in different sectors.
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When purchasing, customers often ask us how to choose the model of the check valve? Many customers only send general models, but there are no requirements for the material, pressure, temperature, etc. of the check valve. When the goods are received, they find that the check valve is not easy to use. In fact, the selection of the check valve has a great relationship with the medium, pressure and temperature.
1.Medium
Under normal medium temperature and low pressure conditions, carbon steel body, 304 core, PTFE material of soft seal valve seat is recommended. For corrosive fluids, the stainless steel valve body can be selected. Material 304 or 316 is recommended. For sulfuric acid there is also desulfurization and denitrification. For the working conditions it is recommended to use two-phase steel.
2. Temperature
3. Pressure
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Founded in 1988, JITAI VALVE GROUP CO., LTD. is a national high-tech enterprise integrating product design and development, mold making, casting and forging production, machining, performance inspection and testing, marketing and service. The company is located at No.8 Wenqiang Road, Yaoxi, Longwan District, Wenzhou City, Zhejiang Province, near Wenzhou International Airport and Railway Station, with superior geographic location and transportation conditions. The company has a registered capital of RMB 108 million, covering a total area of 26,640 square meters, of which 6,800 square meters are for gate valves, globe valves, check valves, 4,500 square meters are for stainless steel valves; 3,600 square meters are for butterfly valves and 3,600 square meters are for ball valves. The company has more than 350 employees, 50 engineers and technicians, including 3 senior engineers, 15 engineers, 32 assistant engineers and technicians.
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Introduce
From the 18th century to the 19th century, with the rapid popularization of the steam engine in the mining industry, smelting, textile, machinery manufacturing and other industries, the demand for valves increased dramatically, promoting the development of valve technology.
Modern check valves are widely used in various industrial and civil fields, including petroleum, chemical, shipbuilding and other industries. With the development of material science and manufacturing technology, the types and performance of check valves are continuously optimized, such as the application of polymeric materials, stainless steel and cobalt-based hard alloys, which makes the check valves work stably even under severe working conditions such as high temperature and high pressure.
The main role of the check valve is to prevent backflow of media, protect system equipment and maintain system pressure. Check valve has only one flow direction, when the medium from the inlet end of the inflow, from the outlet end of the outflow, the valve opens; when the medium backflow, the valve automatically closes, thus preventing backflow damage to the system or unnecessary pressure fluctuations.
Check valves play a protective role in the piping system to ensure that the fluid can only flow in the specified direction. This prevents backflow from damaging or interfering with the normal operation of equipment, pumps or other process equipment. It can help maintain the design working pressure of a system by stopping peak pressures or pressure fluctuations from flowing through the system in a controlled direction, thus ensuring that fluid flows properly through the piping.
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Check valves can be used to supply auxiliary systems in which the pressure may rise above the system pressure. Check valves can be divided into swing check valves and lift check valves.
Check valve this type of valve’s role is to allow the medium to flow in one direction only, and prevent the opposite direction of flow. Usually this valve is automatic, in a direction of flow of fluid pressure, valve open; fluid flow in the opposite direction, by the fluid pressure and the valve flap of the self-weight of the valve flap on the valve seat, thus cutting off the flow.
The structure of check valve is mainly composed of valve body, valve flap and spring. The valve body is usually flanged or threaded for pipeline connection, the internal channel and pipeline internal diameter is the same, the use does not affect the pipeline flow. Valve flap is the main part of the check valve, its internal flow path and channel with the pipeline in the same direction as the fluid. When the fluid flows from one direction to the check valve, the valve flap opens immediately and passes through the pipeline normally; and when the fluid direction is opposite, the valve flap closes by the reverse pressure, thus preventing the fluid from flowing backward. The spring allows the valve flap to seal better during the closing process, ensuring the sealing performance of the backflow valve.
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First, turn off the main water supply valve and make sure the flow of water stops completely. Cleaning and Preparation: Using appropriate tools, remove and clean any impurities from the water mains to ensure that the check valves can be installed correctly.
Select the right size and type of check valve according to the size of the water pipe and piping requirements. There are usually two types: lift type and swing type. Lift check valves are suitable for small pipe diameters and swing check valves are suitable for large pipe diameters.
Choose an appropriate location to install the check valve, usually upstream of the inlet pipe, near equipment or connection points is an ideal choice.
Connect the check valve directly to the ends of the water pipe. If using a threaded connection, use thread tape or lubricant to ensure a tight seal; if using a welded connection, use appropriate welding materials and techniques.
Once installation is complete, open the main water supply valve to ensure proper flow of water through the check valve. Check that the check valve is working correctly; water should only flow in one direction and prevent reverse flow.
The application scenario of check valve is very wide, covering several industrial and civil fields. Its main function is to prevent the reverse flow of media in the pipeline, to protect the safety and stability of equipment and systems. It can be mainly used in hydraulic systems, water treatment industry, oil and gas pipelines, chemical industry, environmental protection and other fields.
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Swash plate check valves are widely used in pipeline systems to prevent liquid backflow hazards and protect machinery and equipment. They not only have the functional characteristics of general check valves, but also have the superior characteristics of reducing water hammer hazards, reducing noise, reducing pressure drop and rapid response. With axial symmetry structure and streamlined flow channel, pressure loss is very small, special manufacturing technology to ensure zero leakage of high requirements, but also has the opening and closing of no impact, maintenance-free and simple installation advantages, suitable for all kinds of gas, liquid media, and has been installed in any way.
Design and manufacturing standards: ASME/ANSIB16.34, E101, JB/T3595
Structure length standard: JB/T3595, ASME/ANSIB16.10, GB/T12221
Welding end or flange standard: GB/T12224, ASME/ANSIB16.25, GB/T9113, JB/T79~JB/T82
Test acceptance standards: JB/T9092, JB/T3595, ASME/ANSIB16.34, E101
The working principle of the axial check valve is to determine the opening and closing of the valve disc through the pressure difference between the inlet end and the outlet end of the valve. When the inlet pressure is greater than the sum of the outlet pressure and the spring force, the disc opens. The DISC REMAINS OPEN as long as there is a differential pressure, but the degree of opening is determined by the differential pressure. When the sum of outlet pressure and spring elasticity is greater than the inlet pressure, the disc is closed and remains closed. Because THE opening AND CLOSING of the disc is in a dynamic force balance system, the valve runs smoothly without noise, and the water hammer phenomenon is greatly reduced.
All parts of the valve are forgings, and the forging is carried out strictly in accordance with the forging process rules and process cards. The initial forging temperature, final forging temperature, deformation degree and deformation speed are strictly controlled, and the cooling method specified in the process rules is cooled. The chemical composition analysis, mechanical property test, intergranular corrosion test and metallography analysis of the forged products were carried out.
The top-loading eccentric half-ball valve is suitable for the mining industry. The ball and the valve seat of the top-loading eccentric half-ball valve are completely separated, which eliminates the wear of the sealing ring and overcomes the problem that the traditional ball valve seat and the sealing surface of the ball are always worn. Non-metallic elastic material It is embedded in the metal seat, and the metal surface of the valve seat is well protected.
The lift check valve is selected for the pipelines of various working conditions such as petroleum, chemical industry, thermal power station, etc. with a nominal pressure of PN1.6 ~ 6.4MPa and a working temperature of -29 ~ 550℃. Applicable media are: water, oil, steam, etc.
Product Overview H14W Stainless Steel Threaded Swing Check Valve The function of the check valve is to prevent the backflow of the medium in the pipeline. The check valve belongs to the automatic valve category, and the opening and closing parts are automatically opened by the force of the flowing medium.
or off. The check valve is only used on the pipeline where the medium flows in one direction to prevent the backflow of the medium to prevent accidents.
It is mainly used in the steam extraction system of thermal power generation steam turbines below 600MW to prevent backflow of medium or water, and to protect important facilities such as steam turbine water pumps. The valve can be closed instantaneously under abnormal conditions such as pipeline medium backflow, power failure, and accident, and the closing time is less than 0.5 seconds.
Insulation jacketed check valve is mainly used in petroleum, chemical, metallurgy, pharmaceutical and other systems to transport high-viscosity media that will solidify at room temperature. The jacket of the thermal insulation series valve is welded between the two flanges of the valve, and the side and bottom of the valve are provided with the connection port of the jacket.
Introduce in detail the ball valve type code, drive mode code, connection form code, structure type code, ball valve seat material code, pressure grade code, valve body material code and flange sealing surface form code. The combination of these knowledge is a relatively complete and detailed model meaning and editing method of the ball valve.
The main feature of stainless steel ball valve is its compact structure, easy operation and maintenance. Different types of ball valves can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media. The ball valve body can be integral or combined. This type of valve should generally be installed horizontally in the pipeline.
1. Stainless steel pneumatic ball valve, stainless steel electric ball valve, stainless steel manual ball valve. Stainless steel ball valve material is divided into 304,316,321 stainless steel ball valve.
2. The stainless steel ball valve relies on the rotating valve core to make the valve unblocked or blocked. The ball valve switch is light, small in size, can be made into a large diameter, reliable sealing, simple structure, convenient maintenance, sealing surface and spherical surface are often in a closed state, not easy to be eroded by media, and are widely used in various industries. Only its closing part is a sphere, and the sphere rotates around the center line of the valve body to open and close a valve.
V-type ball valve model:
VQ640F, VQ40F, VQ940F, VQ641H, VQ70F, VQ670F, VQ970F, VQ71H, VQ671H, VQ971H;
Insulation ball valve model:
BQ41F, BQ641F, BQ941F;
Stainless steel ball valve model:
Q41F-16P, Q641F-10P, Q941F-25P, Q41H-40P, Q641H-10P, Q941H-25P;
Fluorine-lined ball valve model:
Q41F46, Q641F46, Q941F46;
Low temperature ball valve model:
DQ41F, DQ41H, DQ41V;
Wafer type ball valve model:
Q71F, Q671F, Q971F, Q71H, Q671H, Q971H,
High temperature ball valve model:
Q41M, Q641M, Q941M, Q41PPL, Q641PPL, Q941PPL,
Fixed ball valve model:
Q347F, Q647F, Q947F, Q347H, Q647H, Q947H, Q347W, Q647W, Q947W;
Turbine ball valve model:
Q341F, Q341H, Q341W, Q341Y;
Welded ball valve model:
Q61F, Q361F, Q61H, Q661F, Q661H, Q961F, Q961H;
Eccentric hemisphere valve model:
Q340F, Q640F, Q940F, Q340H, Q640H, Q940H, Q340Y, Q640Y, Q940V;
Top entry ball valve model:
SQ340F, SQ940F, SQ340H, SQ940H, SQ347H, SQ647H, SQ947H, DYQ340F, DYQ640F, DYQ940F;
Three-way ball valve model:
Q44F, Q45F, Q44H, Q45H, Q644F, Q645F, Q644H, Q645H, Q944F, Q945F, Q944H, Q945H;
Four-way ball valve model:
Q46F, Q46H, Q646F, Q646H, Q946F, Q946H.
1. The meaning of the ball valve type code:
Q means ball valve;
GQ means track;
VQ means V-type ball valve;
BQ means insulation ball valve;
KQ means anti-sulfur ball valve;
DQ means low temperature ball valve;
MQ means pulverized coal ball valve;
VQ means liquefied balloon valve;
QE means extension rod ball valve;
QO Represents oxygen ball valve;
QF represents fire-proof ball valve;
QS represents reduced diameter ball valve
2. The meaning of the code name of the drive mode of the ball valve:
0 means electromagnetic;
1 means electromagnetic-hydraulic;
2 means electric-hydraulic;
3 means pot wheel;
4 means spur gear;
5 means bevel gear;
6 means pneumatic;
7 means hydraulic;
8 means gas-liquid linkage;
9 Indicates electric
3. The meaning of the ball valve connection form code:
1 means internal thread; 2 means external thread; 4 means flange; 6 means welding; 7 means clamp; 8 means clamp;
0 means hemisphere straight; 1 means floating ball full pass; 4 means floating ball three-way L type; 5 means floating ball three-way T type; 6 means four-way type; 7 means fixed ball full pass-through; 8 means fixed ball three-way type ;9 means floating ball tee V type
5. The meaning of the material code of the ball valve seat:
F means polytetrafluoroethylene;
E means reinforced polytetrafluoroethylene;
D means medium temperature carbon fiber;
PPL means para-polyphenylene;
N means nylon;
M means wear-resistant carbon fiber;
C means high temperature wear-resistant carbon fiber;
V means cemented carbide ;
H means alloy steel;
Q means sugar porcelain;
T means copper alloy;
X means rubber
6. The meaning of the pressure grade code of the ball valve:
16 means the pressure is 16kg (1.6Mpa) and the maximum can reach 64Mpa;
150LB means American standard pound pressure, the maximum pressure rating can reach 2500LB (150LB=1.6MPA/300LB=2.5-4.0mpa/400LB=6.4mpa/600LB=10mpa); 5K means daily pressure, the maximum pressure is 63K;
7. The meaning of the material code of the ball valve body:
A titanium and titanium alloy, C carbon steel, l chromium molybdenum steel, P18-8 series stainless steel, RMo2Ti series stainless steel, S plastic.
8. The meaning of the form code of the sealing surface of the ball valve flange:
RF means raised surface; FM means concave surface; M means convex surface; TG means rod groove surface; FF means full plane; RJ means ring connection surface; SW means socket welding; BW means butt welding; TH means thread
Yes, but its function can only be used to switch, if you want to adjust the steam size, it is recommended to use a regulating valve!
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