discount 70% in 2018-09-18 to 2018-09-20
price: USD$ 119.00
freight :USD$7.00,(Postal parcel)
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This valve is used in working temperature less than 100 degrees of oil pipeline for open and close with medium. The gas can be passed through the medium. Price concessions, quality assurance. And in stock. Products have flange connection and thread connection of two ways of connection. The product performance is stable and the price is reasonable. The valve can pass through water, steam, oil, gas, rubber products on the pipeline. It's the national standard heavy duty valve. The inner structure has two structures: iron core and copper core. The product wholesale price, MOQ 1
Types of valves
1. gate valve
Gate valve, also known as gate valve, is a widely used valve. Its closing principle is that the gate sealing surface and the sealing surface of the valve seat are smooth and flat, and they are mutually bonded, which can prevent the flow of the medium, and rely on the shape of the top die, spring or gate to enhance the sealing effect. It mainly cuts off in the pipeline.
Its advantages are: fluid resistance is small, opening and closing strength, can be used in the two-way flow of media, no direction, fully open when the sealing surface is not easy to erosion, short structural length, not only suitable for small valves, but also suitable for large valves.
The valve is divided into two types according to the stem thread, the first is the rod type, and the two is the dark rod type. According to the gate structure, there are two types, one is parallel, the other is mode two.
2. stop valve
The cut-off valve, also called the door, is the most widely used as a valve, it is popular is because the process of opening and closing the sealing surface friction between the small, more durable, highly open small, easy manufacture, convenient maintenance, not only for low pressure, but also suitable for high pressure.
Its closing principle is to rely on the valve bar pressure, so that the valve sealing surface and seat sealing surface close together, to prevent the circulation of media.
The one-way valve can only medium flow direction when installing. Its structure length is larger than gate valve, at the same time, the fluid resistance is large, the long-term operation, the sealing reliability is not strong.
Stop valve is divided into three types: straight through, right angle and DC type oblique stop valve.
3. butterfly valve
Butterfly valve, also known as butterfly valve, as its name implies, its key components like butterflies in the wind, free swing.
Butterfly valve disc is round, around the valve seat in an axis of rotation, the size of the rotation angle is the valve opening and closing degree.
Butterfly valve has the characteristics of light, compared to other valves to save material, simple structure, quick opening and closing, cutting and throttling can be used, fluid resistance is small, the operation is labor-saving. Butterfly valve can be made into large caliber. You can use the butterfly valve place, it is best not to gate valve, because the butterfly valve is more economical than the gate valve, and good regulation. At present, butterfly valves are widely used in hot water pipes.
4. ball valve
The working principle of ball valve is to make the valve unblocked or blocked by rotary valve. Ball valve switch light, small size, can be made very large caliber,
The sealing is reliable, the structure is simple, the maintenance is convenient, the sealing surface and the spherical surface are often closed, and it is not easy to be eroded by the medium, so it is widely used in various industries.
Ball valve is divided into two categories, one is floating ball, two is fixed ball type.
5. cock valve
Plug valve is to rely on the plug body around the centerline of the body rotation, so as to achieve the purpose of opening and closing. Its function is to cut off the fields and change the direction of the medium. Simple structure,
Small size, only rotate 90 during operation. And the fluid resistance is not big. The disadvantage is that the switch is difficult to work, the sealing surface is easy to wear, and it is easy to be jammed at high temperature,
Not suitable for regulating flow.
Cock, cock, cock, also called to the door. There are many kinds of it, straight through, three and four.
The 6. check valve depends on the force of the fluid itself
A valve that opens and closes automatically. Its function is to prevent the medium from flowing backwards. It has many names, such as check valve, check valve, single flow gate, etc.. According to the structure can be divided into two categories.
(1) lift type: the valve moves along the vertical centerline of the valve body. There are two types of check valves: one is horizontal, and the other is horizontal pipes,
The valve body is similar to the cut-off valve, and the other is vertical, mounted in a vertical pipe,.
(2) swing type: the valve rotates around the pin axis outside the seat. These valves have single, double valve and multi valve, but the principle is the same.
Suction end of the valve pump suction pipe is deformation check valve, its structure and the two types of valve only because of its lower end is the same, just open, to allow water to enter.
7. pressure reducing valve
Pressure reducing valve is to reduce the medium pressure to a certain value of the automatic valve, generally after the valve pressure is less than 50% of the pressure before the valve. There are many kinds of pressure reducing valves,
There are two kinds of piston and spring film type.
The piston type pressure reducing valve is a valve which is decompressed by the piston,. Spring diaphragm pressure reducing valves rely on springs and membranes to perform pressure balancing,
8. drain valve
Traps are also called steam stop drain valve, steam water valve, trap, backwater box, backwater gate, etc.. Its function is to excrete the condensed water automatically without letting the steam out.
There are many kinds of traps, such as float type, floating ball type, bell float type, pulse type, thermal power type, and thermal expansion type. Float type is commonly used,
Bell float type and thermal power type.
(1) float type trap float type drain valve main valve, shaft, conduit, float and shell components.
When the condensate in the equipment or pipe is pushed into the trap under the steam pressure, it gradually increases to the end when the float is close to the full float
The weight down over the buoyancy and sink, the throttle opening. So that the condensation water in the cylinder is at the steam pressure
The catheter and valve are discharged under action. When the condensed water in the buoy is close to the end, the float valve is closed and the buoy is opened because the weight of the buoy is raised
Initial accumulation of condensed water. In this way, the periodic operation can not only automatically discharge the condensate, but also prevent the escaping of the steam.
(2) bell type float type drain valve
Bell type float type trap is also called bucket type trap (mainly composed of regulating valve, bucket, shell and filtering device and other components. The bucket in the trap is inverted,
At the beginning of the drop position, the control valve is open. When the cold air and condensate in the equipment or pipe are pushed by the steam pressure into the drain valve,
Immediately discharged by the control valve. On the one hand, when the steam and a small amount of air discharged gradually filled the bucket internal volume, while the accumulation of condensed water, bucket generated
Buoyancy and rise, so that the control valve closed, stop discharging condensate. On the other hand, a small fraction of the steam and air inside the bucket is discharged from the small hole at the top of the bucket
After part of the cooling liquid, so that the bucket buoyancy decreases gradually falling, makes the valve open, and discharge condensate. This works periodically and automatically
The condensation water is removed, and the vapor escape is prevented.
(3) thermal power type drain valve
Thermal power drain valve
When the condensate flow in the equipment or pipe enters the gas stop drain valve, the steam in the transformer chamber is condensed to reduce the pressure, and the force under the valve plate is greater than the force above
Therefore, the valve plate is jacked up. Because the condensate is greater than the viscosity of the steam, the flow rate is low, so the valve plate and the bottom of the valve is not easy to cause negative pressure,
At the same time, the condensation water is not easy to flow into the pressure transformer chamber through the gap between the valve plate and the shell, so that the valve slice is kept open, and the condensed water is discharged through the circular groove.
When the steam flow in the equipment or pipe is blocked by the steam, the steam is smaller than the viscosity of the condensed water, and the flow rate is high, so the valve seat and the valve seat are easy to cause negative pressure
When the part of the steam flows into the transformer chamber, the force on the valve plate is greater than the force below, so that the valve plate is rapidly closed. In this way, the condensed water can be automatically discharged by working periodically
It can also prevent steam escaping.