The opening and closing parts of the globe valve is a plug-shaped valve flap, the sealing surface is flat or sea cone surface, the valve flap along the center line of the valve seat for linear movement. The form of movement of the valve stem, there are also lifting rotating stem type can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, slurry, oil, liquid metals and radioactive media. Therefore, this type of cut-off globe valve valve is very suitable for cutting off or regulating and throttling.
As a Chinese globe valve supplier with a variety of international certifications and praise from customers, we produce high performance globe 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 globe valve? Many customers only send general models, but there are no requirements for the material, pressure, temperature, etc. of the globe valve. When the goods are received, they find that the globe valve is not easy to use. In fact, the selection of the globe valve has a great relationship with the medium, pressure and temperature.
1. Medium
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
Globe valve, also known as cut-off valve, belongs to the mandatory sealing valve, so when the valve is closed, pressure must be applied to the valve flap to force the sealing surface does not leak. When the medium enters the valve from below the valve flap, the resistance to be overcome by the operating force is the friction of the valve stem and packing and the thrust generated by the pressure of the medium, the force to close the valve is greater than the force to open the valve, so the diameter of the valve stem should be large, or else the stem will occur the top of the bending of the valve stem failure. According to the connection method is divided into three kinds: flange connection, silk buckle connection, welding connection.
Globe valve (stop valve) of the opening and closing parts are plug-shaped valve flap, sealing the top of the plane or sea cone surface, the valve flap along the center line of the valve seat for linear movement. Stem movement form, (common name: dark stem), there are also lifting and rotating stem type can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, slurry, oil, liquid metals and radioactive media. Therefore, this type of cut-off globe valve valve is very suitable for cutting off or regulating and throttling. Due to the relatively short stem opening or closing stroke of this type of valve, and has a very reliable cut-off function, but also because of the changes in the valve seat orifice and the valve stroke is proportional to the relationship between the valve flap, is very suitable for the regulation of the flow rate.
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Globe valve in the pipeline where the medium plays an important role in cutting off and throttling, globe valve as an extremely important cut-off type of valve, its sealing is by applying torque to the valve stem, the valve stem in the axial direction to the valve flap pressure, so that the valve flap sealing surface and the valve seat sealing surface close to prevent leakage of media along the sealing surface of the gap between.
Globe valve sealing by the valve sealing surface and the valve seat sealing surface, the valve stem drives the valve flap along the center line of the valve seat for vertical movement. Globe valve opening and closing process start height is small, easy to adjust the flow, and manufacturing and maintenance is convenient, the pressure is applicable to a wide range.
Globe valve mainly contains valve body, valve flap, valve stem, seals, actuators (drive device) and other components. The valve body is the main part of the globe valve, usually made of cast iron, ductile iron, cast steel, stainless steel and other materials. There is a flow path inside the valve body for the passage of fluid. The valve flap is the key part of the valve, and its role is to control the flow of fluid. The door plate usually adopts double plane hard seal or soft seal structure, which can effectively prevent fluid leakage. The material of the door plate can be chosen from cast iron, ductile iron, cast steel, stainless steel and so on. The valve stem is the part connecting the door plate with the actuator such as handwheel or motor, and the door plate is driven to open or close by rotating the valve stem. Seal refers to the sealing element between the valve body, door plate and stem and other parts, usually made of rubber, PTFE and other materials. Driving device includes handwheel, gear drive and electric device, etc., which is used to drive the stem movement to realize the opening and closing of the valve.
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Check the parts list and drawings for the model and specifications of the globe valve, and check whether the materials and tools selected meet the requirements. Clean and inspect the parts to ensure that the surface of the parts is free of any dirt and defects, and check whether the size of the parts meets the requirements. Prepare the required tools and equipment, such as wrenches, torque wrenches, pliers, hammers, lubricating oil, zinc oxide paste, etc. Place the valve body on the workbench and tighten the flange bolts sequentially with a wrench to ensure that the valve body is tightly connected to the pipeline. Put the valve stem into the valve body, take care that the top of the stem is aligned with the bonnet and install a stop at the top of the stem. Place the spool into the valve stem and then place the stem into the valve body with the spool. Attach the end of the spool to the stem and tighten the spool bolts with a wrench. Place the bonnet on the valve body and tighten the flange bolts sequentially with a wrench. Place the handwheel on the valve stem and tighten the handwheel nut with a wrench. Check whether the valve is well connected and whether the valve is smooth, and coat the valve parts with lubricating oil and zinc oxide paste. Test run the valve to check whether the valve opens and closes flexibly and smoothly.
Globe valves are suitable for a wide range of scenarios and industrial applications, and their main function is to control the flow of fluids, cut off or regulate the path of fluids.
It can be used in areas such as municipal water supply, controlling the flow of oil and gas, controlling the flow of chemicals, regulating the flow of coolant or hot water, controlling the flow and treatment of wastewater, food and beverage production, controlling seawater, controlling pharmaceuticals and chemicals, and controlling water resources in agricultural fields.
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The opening and closing part of the insulation globe valve is a stop-shaped valve disc, the sealing surface is flat or conical, and the valve disc moves linearly along the center line of the fluid. The movement form of the valve stem, there are lifting rod type (the valve stem is lifted, the handwheel is not lifted), and there are lifting and rotating rod type (the handwheel and the valve stem are rotated and lifted together, and the nut is located on the valve body). The striated globe valve is only suitable for full opening and full closing, and is not allowed to adjust and throttle.
J41H/W American standard check valve is suitable for cutting off or connecting pipeline medium in various working conditions of petroleum, chemical industry, pharmaceutical industry, chemical fertilizer and power industry with nominal pressure PN1.6 ~ 16MPa and working temperature -29 ~ 550℃. The driving mode is manual, gear drive, electric, pneumatic, etc.
German standard bellow stop valve is suitable for the nominal pressure PN1.6 ~ 16MPa, working temperature -29 ~ 350℃ of flammable, explosive, highly toxic, toxic fluid, high temperature heat transfer oil, liquid ammonia and other media.
Widely used in: petrochemical, chemical fiber textile, plastic paper, electric power steel, printing and dyeing rubber, natural gas and other gas systems, safe and reliable performance, widely used in ethylene glycol and other industrial fluids. The driving mode is manual, gear drive, electric, pneumatic and so on.
J41F4-16, J41F46-16 fluorine-lined stop valve is suitable for all kinds of concentrations of aqua royalty, flow acid, hydrochloric acid, hydrofluoric acid and various organic acids, strong acids, strong oxidants, but also suitable for all kinds of concentrations of strong alkali organic solvents and other corrosive gases, liquid medium pipeline use.
The working principle of carbon steel globe valve, American standard globe valve and American standard gate valve is to make the valve unblocked or blocked by rotating the valve. The gate valve is easy to switch, small in size, can be made into a large diameter, reliable in sealing, simple in structure, convenient in maintenance, and the sealing surface and spherical surface are often in a closed state, which is not easy to be eroded by the medium, and has been widely used in various industries.
J41B Ammonia globe valve is specially designed for ammonia and gas pipelines or devices. The structure pays attention to fire protection requirements. The packing is made of polytetrafluoroethylene, which has reliable sealing and leakage. The sealing material is made of polytetrafluoroethylene, which is soft and reliable. It is suitable for ammonia gas, liquefied petroleum gas and fluorine gas pipeline system. As an opening and closing device, it is also suitable for other pipelines with temperature ≤150℃. The shut-off valve for ammonia has the characteristics of stable sealing performance, safe and reliable use, strong corrosion resistance, no internal and external leakage of medium and easy operation. The problem of poor and easy leakage is especially suitable for the transmission of ammonia gas and gas pipelines in the chemical industry, and to meet the requirements of long-term reliable use. Its sealing, maintainability, safety, etc.
There are two types of bonnet designs. The first is a bolted bonnet. The valve designed according to this design form, the valve body and the bonnet are connected with bolts and nuts, and the wound gasket 304 clamps flexible graphite to make the seal. Customers have special Metal ring connection can also be used when required. The second design form is the welded bonnet. For the valve designed in this design form, the valve body and the bonnet are connected by threads, and they are fully welded and sealed. It can also be used when customers have special requirements. Connection by penetration welding.
The valve is suitable for the working temperature less than 400 degrees C and less than 550 degrees C. working medium for water, steam and oil pipeline, as the opening and closing device, especially for thermal power plant, medicine, paper and olher steam turbine condensing and vacuum negaiive pressure sysiem, io play a vacuum isolation and sealing effect.
The material of DJ41Y low temperature globe valve working at low temperature should ensure its low temperature performance, mainly to ensure its cold shock strength. The valve trim must be properly selected to have sufficient cold shock strength to prevent breakage. Alloy steels of C and Cr lose their impact strength quickly when they are lower than -20°C, so the use temperature is limited to -30°C and -50°C, respectively. Nickel steel with a Ni content of 3.5% can be used up to -100°C, and nickel steel with a Ni content of 9% can be used up to -196°C. Austenitic stainless steel, nickel, Monel, Hastelloy, titanium, aluminum alloys and bronze can be used to lower temperatures (-273°C).
The opening and closing part of the heat preservation globe valve is a plug-shaped valve disc, the sealing surface is a plane or a conical surface, and the valve disc moves linearly along the center line of the fluid. The movement form of the valve stem includes a lifting rod type (the valve stem rises and falls, and the handwheel does not rise and fall), and there is also a lifting rotary rod type (the handwheel rotates and lifts together with the valve rod, and the nut is arranged on the valve body). The bellows globe valve is only suitable for fully open and fully closed, no adjustment and throttling are allowed.
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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